iMechanica - Material modeling
https://imechanica.org/taxonomy/term/3561
enPostdoc (3 years) on Advanced Material Modelling using Finite Element Analysis for Technical Textiles and Textile Manufacturing
https://imechanica.org/node/26923
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/73">job</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/8647">textile</a></div><div class="field-item odd"><a href="/taxonomy/term/1464">finite element modeling</a></div><div class="field-item even"><a href="/taxonomy/term/3561">Material modeling</a></div><div class="field-item odd"><a href="/taxonomy/term/1968">Multi-scale modeling</a></div><div class="field-item even"><a href="/taxonomy/term/162">computational mechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/846">FEM</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p align="justify">We are seeking a dedicated postdoc on advanced material modelling in the textile domain. In this project you will dive deep into a cutting-edge research area, exploring the complexities of advanced textile material modelling. You will be part of a team of 4 researchers (3 PhDs and one postdoc) who will all work on this large research project. The postdoctoral researcher is also expected to support the 3 PhD students and act as a mentor and tutor for them.</p>
<p align="justify">The research project focusses on the development of a robust multi-scale textile modelling framework, utilizing finite element analysis combined with virtual fibre modelling. Simulations encompass both the manufacturing side (e.g. weaving, stitching, bobbin unwinding, etc.) as well as the performance side (e.g. strength prediction of specialized technical fabric connections). Such simulations are very challenging due to the use of diverse materials (natural and synthetic fibers, yarns and fabrics) combined with high anisotropy and non-linearity. Furthermore, the dynamics of high-speed manufacturing processes need to be included in the modelling framework, ensuring its applicability to real-world processes. This is still a very new research topic and many scientific questions remain unanswered.</p>
<p align="justify">Requirements</p>
<ul>
<li>Experience with finite element mechanical modelling, and knowledge of Abaqus™ or other commercial FEA packages;</li>
<li>PhD in mechanical engineering, computational mechanics, materials science, or similar;</li>
<li>Familiar with mechanics of materials and experimental and computational techniques;</li>
<li>Good knowledge of English writing and speaking;</li>
</ul>
<p class="MsoNormal"><span>More information can be found on <a href="https://composites.ugent.be/PhD_job_vacancies_PhD_job_positions_composites.html">https://composites.ugent.be/PhD_job_vacancies_PhD_job_positions_composit...</a>.</span></p>
</div></div></div>Fri, 20 Oct 2023 12:54:19 +0000wvpaepeg26923 at https://imechanica.orghttps://imechanica.org/node/26923#commentshttps://imechanica.org/crss/node/26923PhD (4 years) on Advanced Material Modelling using Finite Element Analysis for Technical Textiles and Textile Manufacturing
https://imechanica.org/node/26922
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/73">job</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/8647">textile</a></div><div class="field-item odd"><a href="/taxonomy/term/1464">finite element modeling</a></div><div class="field-item even"><a href="/taxonomy/term/350">simulation</a></div><div class="field-item odd"><a href="/taxonomy/term/1968">Multi-scale modeling</a></div><div class="field-item even"><a href="/taxonomy/term/3561">Material modeling</a></div><div class="field-item odd"><a href="/taxonomy/term/162">computational mechanics</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p align="justify">We are seeking a dedicated PhD candidate on advanced material modelling in the textile domain. In this project you will dive deep into a cutting-edge research area, exploring the complexities of advanced textile material modelling. You will collaborate closely with an research team comprising 2 other PhD students and a postdoctoral researcher.</p>
<p align="justify">The research project focusses on the development of a robust multi-scale textile modelling framework, utilizing finite element analysis combined with virtual fibre modelling. Simulations encompass both the manufacturing side (e.g. weaving, stitching, bobbin unwinding, etc.) as well as the performance side (e.g. strength prediction of specialized technical fabric connections). Such simulations are very challenging due to the use of diverse materials (natural and synthetic fibers, yarns and fabrics) combined with high anisotropy and non-linearity. Furthermore, the dynamics of high-speed manufacturing processes need to be included in the modelling framework, ensuring its applicability to real-world processes. This is still a very new research topic and many scientific questions remain unanswered.</p>
<p align="justify">Requirements</p>
<ul>
<li>Experience with finite element mechanical modelling, knowledge of Abaqus™ or other commercial FEA packages;</li>
<li>Familiar with mechanics of materials and experimental and computational techniques;</li>
<li>Master’s degree in mechanical engineering, computational mechanics, materials science, or similar;</li>
<li>Good knowledge of English writing and speaking;</li>
</ul>
<p>More information can be found on <a href="https://composites.ugent.be/PhD_job_vacancies_PhD_job_positions_composites.html">https://composites.ugent.be/PhD_job_vacancies_PhD_job_positions_composit...</a>.</p>
</div></div></div>Fri, 20 Oct 2023 12:53:13 +0000wvpaepeg26922 at https://imechanica.orghttps://imechanica.org/node/26922#commentshttps://imechanica.org/crss/node/26922Viscoelastic material modeling
https://imechanica.org/node/23038
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Hello,</p>
<p>I have a question regarding viscoelastic materials and property definitions through prony series.</p>
<p>If i am not wrong ,the values wi and τi of the series can be expressed either in terms of time domain or frequency domain.</p>
<p>Having the prony series expressed at time domain, how can the relaxation tensor be expressed? Do i still need to perform</p>
<p>Laplace-Carson transformation, of the time dependent relaxation and creep functions or their prony series expression is enough,</p>
<p>so i can get the full relaxation tensor (isotropic case) as:</p>
<p> </p>
<p> G(t) = G0(1-Σν1 (wi*(1-exp(-t/τi))) (similarly for K(t))</p>
<p>and the full tensor: Gijkl(t) = 2G(t)Idev +K(t)1⊗1</p>
<p>Idev = deviatoric of fourth order unit tensor</p>
<p>1 = second order unit tensor</p>
<p><span>⊗ = tensor product</span></p>
<p> </p>
<p>Thank you in advance.</p>
</div></div></div><div class="field field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above"><div class="field-label">Forums: </div><div class="field-items"><div class="field-item even"><a href="/forum/390">Materials Forum</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-above"><div class="field-label">Free Tags: </div><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/795">viscoelasticity</a></div><div class="field-item odd"><a href="/taxonomy/term/3561">Material modeling</a></div><div class="field-item even"><a href="/taxonomy/term/1191">Prony Series</a></div><div class="field-item odd"><a href="/taxonomy/term/935">FEA</a></div></div></div>Fri, 25 Jan 2019 13:48:22 +0000lefteris tsivolas23038 at https://imechanica.orghttps://imechanica.org/node/23038#commentshttps://imechanica.org/crss/node/23038Post-Doc Position: Multiscale Simulations of Pattern Formation in Mixed Crystals
https://imechanica.org/node/14958
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/73">job</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/541">job</a></div><div class="field-item odd"><a href="/taxonomy/term/608">research</a></div><div class="field-item even"><a href="/taxonomy/term/656">education</a></div><div class="field-item odd"><a href="/taxonomy/term/1552">computation</a></div><div class="field-item even"><a href="/taxonomy/term/2668">Multiscale Simulations</a></div><div class="field-item odd"><a href="/taxonomy/term/2841">material science</a></div><div class="field-item even"><a href="/taxonomy/term/3371">DFT</a></div><div class="field-item odd"><a href="/taxonomy/term/3561">Material modeling</a></div><div class="field-item even"><a href="/taxonomy/term/6209">Monte carlo</a></div><div class="field-item odd"><a href="/taxonomy/term/7826">Ab initio</a></div><div class="field-item even"><a href="/taxonomy/term/8903">MC Simulations</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p align="center">
Post-Doc Position: <strong>Multiscale Simulations of Pattern Formation in Mixed Crystals</strong>
</p>
<p align="justify">
</p>
<p align="justify">
The chair of Materials and Process Simulation at the University of Bayreuth is offering a postdoc position in the field of multiscale simulations of advanced materials. In the project, a combination of classical Monte Carlo simulations and ab initio calculations is used for investigating the formation of domains in half-Heusler materials. The investigations are of great relevance for the development of new thermoelectric materials. The project is funded within the framework of the focus program SPP 1386 “Nanostructured Thermoelectrics” by the German Research Foundation (Deutsche Forschungsgemeinschaft).</p>
<p align="justify">
Are you interested in broadening your scientific knowledge by supporting the development of novel alternative energy sources with the help of state-of-the-art multiscale simulation techniques? Have you completed your masters/diploma degree and your PhD (doctoral degree) with above-average results?
</p>
<p align="justify">
In this case, we offer you a stimulating environment in the field of computer aided materials design, implemented in a top-level research framework. We are a dynamic, international team of multidisciplinary scientists, engaged in numerous science and industrial cooperations. In our scientific work, we cover the whole spectrum from basic concepts of physical modeling over implementation with enhanced supercomputing techniques to industrially relevant questions of simulation-based material design. This involves developing, implementing, and applying models at different scales, such as ab initio, molecular, phase-field, and FEM models.
</p>
<p align="justify">
</p>
<p align="justify">
Applicants must hold a doctor/PhD degree and have the documented ability to carry out novel research projects. They should have gained fundamental experience in modeling and simulation in physics, chemistry, mathematics, or material science. We appreciate candidates with good skills in, at least, one of the following topics: Monte Carlo simulations, ab initio density functional theory or statistical physics. We especially encourage applications of young scientists who just recently accomplished their PhD.</p>
<p>
We offer:</p>
<p>
A postdoc position (TV-L E13)</p>
<p>
The University of Bayreuth supports women in science and especially encourages them to apply. Handicapped applicants will be preferred if they are equally qualified.</p>
<p>
</p>
<p>
<strong>Please submit your application, as soon as possible, to:</strong></p>
<p>
Prof. Dr.-Ing. Heike Emmerich</p>
<p>
</p>
<p>
Chair for Material- and Process Simulations (MPS)<br />
University of Bayreuth</p>
<p>
</p>
<p>
<br />
Postal address: MPS, Postfach 10 12 51, D-95440 Bayreuth<br />
Visitor address: Universitätsstraße 30, Gebäude NW III, D-95447 Bayreuth</p>
<p>
<strong>Email: <a href="mailto:sekretariat-mps@uni-bayreuth.de">sekretariat-mps@uni-bayreuth.de</a></strong>
</p>
<p>
_______________________________________________________________________________________
</p>
<p>
<strong>For any further details: </strong>
</p>
<p>
Dr. Thomas Gruhn , <a id="yui_3_7_2_1_1370857483628_4710" href="mailto:thomas.gruhn@uni-bayreuth.de">thomas.gruhn@uni-bayreuth.de</a>
</p>
</div></div></div>Thu, 11 Jul 2013 09:14:00 +0000ajmal.choudhary14958 at https://imechanica.orghttps://imechanica.org/node/14958#commentshttps://imechanica.org/crss/node/14958Post-Doc Position: Multiscale Simulations of Pattern Formation in Mixed Crystals
https://imechanica.org/node/14957
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/128">education</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/541">job</a></div><div class="field-item odd"><a href="/taxonomy/term/608">research</a></div><div class="field-item even"><a href="/taxonomy/term/656">education</a></div><div class="field-item odd"><a href="/taxonomy/term/1552">computation</a></div><div class="field-item even"><a href="/taxonomy/term/2668">Multiscale Simulations</a></div><div class="field-item odd"><a href="/taxonomy/term/2841">material science</a></div><div class="field-item even"><a href="/taxonomy/term/3371">DFT</a></div><div class="field-item odd"><a href="/taxonomy/term/3561">Material modeling</a></div><div class="field-item even"><a href="/taxonomy/term/6209">Monte carlo</a></div><div class="field-item odd"><a href="/taxonomy/term/7826">Ab initio</a></div><div class="field-item even"><a href="/taxonomy/term/8903">MC Simulations</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p align="center">
Post-Doc Position: <strong>Multiscale Simulations of Pattern Formation in Mixed Crystals</strong>
</p>
<p align="justify">
</p>
<p align="justify">
The chair of Materials and Process Simulation at the University of Bayreuth is offering a postdoc position in the field of multiscale simulations of advanced materials. In the project, a combination of classical Monte Carlo simulations and ab initio calculations is used for investigating the formation of domains in half-Heusler materials. The investigations are of great relevance for the development of new thermoelectric materials. The project is funded within the framework of the focus program SPP 1386 “Nanostructured<br />
Thermoelectrics” by the German Research Foundation (Deutsche<br />
Forschungsgemeinschaft). </p>
<p align="justify">
Are you interested in broadening your scientific knowledge by supporting the development of novel alternative energy sources with the help of state-of-the-art multiscale simulation techniques? Have you completed your masters/diploma degree and your PhD (doctoral degree) with above-average results? In this case, we offer you a stimulating environment in the field of computer aided materials design, implemented in a top-level research framework. We are a dynamic, international team of multidisciplinary scientists, engaged in numerous science and industrial cooperations. In our scientific work, we cover the whole spectrum from basic concepts of physical modeling over implementation with enhanced supercomputing techniques to industrially relevant questions of simulation-based material design. This involves developing,<br />
implementing, and applying models at different scales, such as ab<br />
initio, molecular, phase-field, and FEM models.
</p>
<p align="justify">
Applicants must hold a doctor/PhD degree and have the documented ability to carry out novel research projects. They should have gained fundamental experience in modeling and simulation in physics, chemistry, mathematics, or material science. We appreciate candidates with good skills in, at least, one of the following topics: Monte Carlo simulations, ab initio density functional theory or statistical physics. We especially encourage applications of young scientists who just recently accomplished their PhD.</p>
<p>
We offer:</p>
<p>
A postdoc position (TV-L E13)</p>
<p>The University of Bayreuth supports women in science and<br />
especially encourages them to apply. Handicapped applicants will be<br />
preferred if they are equally qualified.</p>
<p>
</p>
<p>
<strong>Please submit your application, as soon as possible, to:</strong></p>
<p>
Prof. Dr.-Ing. Heike Emmerich</p>
<p>
</p>
<p>
Chair for Material- and Process Simulations (MPS)<br />
University of Bayreuth</p>
<p>
</p>
<p>
<br />
Postal address: MPS, Postfach 10 12 51, D-95440 Bayreuth<br />
Visitor address: Universitätsstraße 30, Gebäude NW III, D-95447 Bayreuth</p>
<p>
<strong>Email: <a href="mailto:sekretariat-mps@uni-bayreuth.de">sekretariat-mps@uni-bayreuth.de</a></strong>
</p>
<p>
_______________________________________________________________________________________
</p>
<p>
<strong>For any further details: </strong>
</p>
<p>
Dr. Thomas Gruhn , <a id="yui_3_7_2_1_1370857483628_4710" href="mailto:thomas.gruhn@uni-bayreuth.de">thomas.gruhn@uni-bayreuth.de</a>
</p>
</div></div></div>Thu, 11 Jul 2013 09:13:45 +0000ajmal.choudhary14957 at https://imechanica.orghttps://imechanica.org/node/14957#commentshttps://imechanica.org/crss/node/14957Post-Doc Position: Multiscale Simulations of Pattern Formation in Mixed Crystals
https://imechanica.org/node/14956
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/608">research</a></div><div class="field-item odd"><a href="/taxonomy/term/1552">computation</a></div><div class="field-item even"><a href="/taxonomy/term/2841">material science</a></div><div class="field-item odd"><a href="/taxonomy/term/3371">DFT</a></div><div class="field-item even"><a href="/taxonomy/term/3561">Material modeling</a></div><div class="field-item odd"><a href="/taxonomy/term/6209">Monte carlo</a></div><div class="field-item even"><a href="/taxonomy/term/7826">Ab initio</a></div><div class="field-item odd"><a href="/taxonomy/term/8903">MC Simulations</a></div><div class="field-item even"><a href="/taxonomy/term/8904">Multiscale Simulations.</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p align="center">
Post-Doc Position: <strong>Multiscale Simulations of Pattern Formation in Mixed Crystals</strong>
</p>
<p align="justify">
</p>
<p align="justify">
The chair of Materials and Process Simulation at the University of Bayreuth is offering a postdoc position in the field of multiscale simulations of advanced materials. In the project, a combination of classical Monte Carlo simulations and ab initio calculations is used for investigating the formation of domains in half-Heusler materials. The investigations are of great relevance for the development of new thermoelectric materials. The project is funded within the framework of the focus program SPP 1386 “Nanostructured Thermoelectrics” by the German Research Foundation (Deutsche Forschungsgemeinschaft).</p>
<p align="justify">
Are you interested in broadening your scientific knowledge by supporting the development of novel alternative energy sources with the help of state-of-the-art multiscale simulation techniques? Have you completed your masters/diploma degree and your PhD (doctoral degree) with above-average results?
</p>
<p align="justify">
In this case, we offer you a stimulating environment in the field of computer aided materials design, implemented in a top-level research framework. We are a dynamic, international team of multidisciplinary scientists, engaged in numerous science and industrial cooperations. In our scientific work, we cover the whole spectrum from basic concepts of physical modeling over implementation with enhanced supercomputing techniques to industrially relevant questions of simulation-based material design. This involves developing, implementing, and applying models at different scales, such as ab initio, molecular, phase-field, and FEM models.
</p>
<p align="justify">
</p>
<p align="justify">
Applicants must hold a doctor/PhD degree and have the documented ability to carry out novel research projects. They should have gained fundamental experience in modeling and simulation in physics, chemistry, mathematics, or material science. We appreciate candidates with good skills in, at least, one of the following topics: Monte Carlo simulations, ab initio density functional theory or statistical physics. We especially encourage applications of young scientists who just recently accomplished their PhD.</p>
<p>
We offer:</p>
<p>
A postdoc position (TV-L E13)</p>
<p>
The University of Bayreuth supports women in science and especially encourages them to apply. Handicapped applicants will be preferred if they are equally qualified.</p>
<p>
</p>
<p>
<strong>Please submit your application, as soon as possible, to:</strong></p>
<p>
Prof. Dr.-Ing. Heike Emmerich</p>
<p>
Chair for Material- and Process Simulations (MPS)<br />
University of Bayreuth</p>
<p>Postal address: MPS, Postfach 10 12 51, D-95440 Bayreuth<br />
Visitor address: Universitätsstraße 30, Gebäude NW III, D-95447 Bayreuth</p>
<p>
<strong>Email: <a href="mailto:sekretariat-mps@uni-bayreuth.de">sekretariat-mps@uni-bayreuth.de</a></strong>
</p>
<p>
_______________________________________________________________________________________
</p>
<p>
<strong>For any further details: </strong>
</p>
<p>
Dr. Thomas Gruhn , <a id="yui_3_7_2_1_1370857483628_4710" href="mailto:thomas.gruhn@uni-bayreuth.de">thomas.gruhn@uni-bayreuth.de</a>
</p>
</div></div></div>Thu, 11 Jul 2013 08:34:43 +0000ajmal.choudhary14956 at https://imechanica.orghttps://imechanica.org/node/14956#commentshttps://imechanica.org/crss/node/14956Modeling of a reinforced concrete beam under a rolling load.
https://imechanica.org/node/10106
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hi, we're trying to model with ABAQUS a reinforced concrete beam under a rolling load. We want to investigate the compressive low cycle fatigue of reinforced concrete elements under a variable bending moment. We are using a Static Step (total step time: 18000 sec) and a concentrated force applied on the middle cross section with the following load history*:
</p>
<p>
0 0<br />
1 0.048715313<br />
2 0.115621788<br />
3 0.19938335<br />
4 0.299177801<br />
5 0.413874615<br />
6 0.542343268<br />
7 0.683556012<br />
8 0.836485098<br />
9 1<br />
10 0.864850976<br />
11 0.738129496<br />
12 0.618910586<br />
13 0.505960946<br />
14 0.398355601<br />
15 0.295066804<br />
16 0.194964029<br />
17 0.096916752<br />
18 0
</p>
<p>
*obviously, in order to represent a loading time of at least 10^3 cycles, this load history is repeated several times.
</p>
<p>
We modeled the concrete (class C20/25) with the "Concrete Damaged Plasticity" behaviour, using the following parameters:
</p>
<p>
Dilation angle: 36.31°
</p>
<p>
Eccentricity: 0.01
</p>
<p>
fb0/fc0: 1.16
</p>
<p>
K: 0.66667
</p>
<p>
Viscosity parameter: 0.002
</p>
<p>
CONCRETE COMPRESSION DAMAGE
</p>
<p>
STRESS INEL. STRAIN DAMAGE PARAMETER
</p>
<p>
8.4 0 0 <br />
11.311 7.5E-005 0<br />
16.801 9.9E-005 0 <br />
22.87 0.000154 0<br />
28.004 0.000761 0<br />
22.532 0.002558 0.193<br />
11.332 0.005675 0.596 <br />
2.9442 0.0117331 0.897
</p>
<p>
CONCRETE TENSION DAMAGE
</p>
<p>
STRESS CRACK. STRAIN DAMAGE PARAMETER
</p>
<p>
1.864 0 0<br />
2.65 3.3E-005 0<br />
1.744 0.00016 0.406<br />
0.805 0.00028 0.696<br />
0.211 0.000665 0.92<br />
0.053 0.001087 0.98
</p>
<p>
The beam was modeled with a 2D shell having 2 rebar layers representing the steel reinforcement (we think that's a good approximation, since this is a two-dimensional problem).
</p>
<p>
The reinforcements were modeled with an elasto - plastic behaviour, also including a kinematic hardening.
</p>
<p>
Our questions are:
</p>
<p>
1) Is better to create a Static Step (with a cyclic load history) or a Dyrect Cyclic Step to represent the variable load?
</p>
<p>
2) Are the parameters used to model the concrete behaviour good?
</p>
<p>
3) In case that the answer to the second question is "NO", do you have any suggestions?
</p>
<p>
THANKS
</p>
</div></div></div><div class="field field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above"><div class="field-label">Forums: </div><div class="field-items"><div class="field-item even"><a href="/forum/666">Fracture Mechanics Forum</a></div></div></div><div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/962">software</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-above"><div class="field-label">Free Tags: </div><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3561">Material modeling</a></div><div class="field-item odd"><a href="/taxonomy/term/4195">concrete damaged plasticity</a></div></div></div>Fri, 15 Apr 2011 13:20:49 +0000Taddei.Pazzaglia10106 at https://imechanica.orghttps://imechanica.org/node/10106#commentshttps://imechanica.org/crss/node/10106Modellilng Deep and shallow foundations in Abaqus
https://imechanica.org/node/8487
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Dear All,
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I decided to put this post since I am trying to model piles on granular materials with Abaqus and I am having LOADS of problems, some of them due to my lack of understanding in the subject and others becasue there is not enough information around. Some of my problems are:
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1- convergence problems: I am using Mohr coulomb for the soil and elasticity for the pile. If the difference between Young's modulus for both materials is to big it does not converge on Abaqus Static. If I do not put a bit of cohesion in my soil it also does not converge.
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2- Different failure mode or smaller than it should be.
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I have done a few 2D simulations and the results I get from Abaqus are completely different than the results of the close form solution, even if I refine the mesh.
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I decided to start with shallow foundations in 2D and, once again, the above happens. I am using the default solver parameters, NLgeom on, cohesion of 2kPa, friction angle of 42 degrees (dense sand), dilation of 20degrees and E=100MPa and the same Poisson's coefficient=0.3
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The elements I am using are the C3D8R for the 3D and the CPE4R for the 2D simulations. In order to get the displacement load curve I am displacing the pile or the shallow foundation, vertically, using the boundary condition option.
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Any expertise is extremely welcome.
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Regards
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Pedro
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</div></div></div><div class="field field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above"><div class="field-label">Forums: </div><div class="field-items"><div class="field-item even"><a href="/forum/109">Ask iMechanica</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-above"><div class="field-label">Free Tags: </div><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/169">Plasticity</a></div><div class="field-item odd"><a href="/taxonomy/term/3561">Material modeling</a></div><div class="field-item even"><a href="/taxonomy/term/5360">3D modeling</a></div><div class="field-item odd"><a href="/taxonomy/term/5361">properties</a></div></div></div>Thu, 01 Jul 2010 08:20:23 +0000pedromvf8487 at https://imechanica.orghttps://imechanica.org/node/8487#commentshttps://imechanica.org/crss/node/8487Error | iMechanica