Full scholarships available at European Commission funded workshop on physically based material modelingSubmitted by Tuncay Yalcinkaya on Thu, 2012-07-19 14:25.
European Commission' s JRC (Joint Research Centre) is organizing a workshop on physics based modeling of material properties and experimental observations in collaboration with METU (Middle East Technical University). The workshop will be held in Ankara on 22-23 October 2012.
Our group at North Carolina State University is hiring PhD students and Post-doctoral Associates in the areas of multiscale modeling, computational mechanics, fracture, and plasticity.
Interested parties should email email@example.com, and send a cv with a few representative publications.
I would like to seek comments on : Room temperature stress relaxation and governing mechanisms that contribute to the plasticity that occurs during this process. As, most of the available work on relaxation is done at elevated temperatures.
Please check more on this thread by hari@
I have also attach papers by Prof Hart and Prof Krempl that did throw some light on this particular subject.
Attached herewith a classical paper by Hart on introducing a concept of constant hardness curves refuting that absolute strain should not be considered as a state variable.
The objective of the workshop, co-organized by Joint Research Centre of the European Commission and Middle East Technical University, is to discuss the present status of physics based constitutive modelling of metallic materials and associated experimental methods.
The Workshop is funded by the European Commission's Integration and Enlargment Programme. There is no cost for attending the Workshop. A limited number of scholarships is available for participants from the target countries (see attached flyer).
Is there a place I can find explained examples or tutorials on how to model user defined creep in ANSYS?
I need to follow the creep law __> effective creep strain (e at time t) = S. T. e^(-H)
S=(a0)^t.(sigma)^(a1) ; T = t^(a2)+(a3).t^(a4)+(a5)t^(a6) ; H = (a7)/[(theta)+273.16]
a0 to a7 are material constants.
I have the experimental data and tried to fit the curve in Ansys to obtain the material constants.
I tried to follow the ansys help file steps. But facing erros messages.
If any one could give me a sample apdl code it would be helpful.
We are pleased to announce the forthcoming Summer
School on “Hardening and Damage of Materials under Finite Deformations:
Constitutive Modeling and Numerical Implementation”, which will take place in
Dortmund, Germany from September 3rd to 7th, 2012 and is organized by Prof.
Dr.-Ing. A. Erman Tekkaya of TU Dortmund and Dr. Tudor Balan of LEM3,
Post Doc Position: Risk-based Selection of Constitutive Models for Geotechnical Analysis, EC Nantes (France)Submitted by Panagiotis KOTRONIS on Thu, 2012-05-10 21:29.
Post Doc description:
Soil, as a typical natural material, has very complex behaviour which is very difficult to be accurately modelled. In geotechnical engineering, about half of the accidents are caused by insufficient designs. The soil’s constitutive model is the fundamental issue for modelling and analyzing soil-related engineering systems.
Dear forum members,
I'm trying to simulate a tensile test (of ductile material) using smooth and notched specimens. I've started with a simple model without damage (isotropic von Mises plasticity implemented in ABAQUS) to compare the force vs. displacement response between simulations and experiments.
Two Masters' positions are now available for the winter semester (starting in January), 2013 on computational materials sciene in the Department of Mechanical and Manufacturing Engineering at the Unviersity of Manitoba. The potential student(s) will work on the thermostability and mechanical properties in nanocrystalline materials and crystalline/amorphous composites. Students with strong interests in atomistic simulations (MD, ab inito, monte carlo, etc.) and good programming skills (C, Fortran, etc.) are encouraged to apply. Intrested students please send a CV and inquires to Prof. Deng at firstname.lastname@example.org. More details about the position can be found at: http://home.cc.umanitoba.ca/~dengc/index.html
The Corinth Rift in Greece is one of the most active extensional regions in the Mediterranean area (Fig. 1). The Corinth Rift Laboratory project (CRL, http://crlab.eu) is based on the cooperation of various european institutions that merge their efforts to study fault mechanics and related hazards in this natural laboratory where numerous continuous observations are made. The present rift is asymmetric and deformation is very localized. Numerous GPS campaigns since 1991 indicate a stable opening rate of about 1.5 cm/yr over a width of 10- 12 km in the western part of the rift (Fig. 2). Continuous GPS stations installed 10 years ago start to reveal reliable vertical displacement (Fig.3). The seismic activity is localized in the upper 12 Km of the crust.
I need to write a Vumat subroutine in ABAQUS 6.11.1, and I dont know where should I begin from exactly? can anybody help me with the suitable version of Fortran for this version of ABAQUS and the steps I need to take for writing a SUBROUTINE in ABAQUS?
Thank you guys
Minisymposium on "Plasticity: Bridging the Scales from Micro to Macro" at IWCMM XXII, Baltimore, MD, USA (Sept. 24-26, 2012)Submitted by Shailendra on Fri, 2012-04-06 07:14.
Dear friends and colleagues,
This is to inform you of the minisymposium
Plasticity: Bridging the Scales from Micro to Macro
to be organized at the 22nd International Workshop on Computational Mechanics of Materials (IWCMM XXII) and request you to consider submitting an abstract. The workshop will be held in Baltimore, MD, USA during September 24-26, 2012.
i am working on autofrettage process in a cylinder with end caps . and i have problems with it. which material model is better to be used , what is the proper element to model it . what is the best number of substeps ? and there are errors when i am trying to apply pressure load.
my question is about the history data storage in FEAP.
I am writing element subroutine (elmt01) in FEAP 8.3 for a history dependent problem (crystal plasticity).
I have written the stiffness
matrix subroutine (stiff01), but it needs the data from the previous
solution steps (previous strains, stresses, plastic strains, dislocation
densities .... nh1,nh2=30 per point).
My co-organizers and I invite you to submit an abstract to the upcoming symposium “Multiscale Perspectives on Plasticity in Metals” at the ASME 2012 International Mechanical Engineering Congress & Exposition (IMECE), to be held November 9-15, 2012 in Houston, Texas. This symposium will explore the unique challenges to understanding plastic deformation in metals and formulating material models that can accurately predict thermo-mechanical deformation. Presentations will cover experimental and modeling investigations of the physical mechanisms that control plasticbehavior in metals, and insight gained on incorporating these mechanisms into high-fidelity models and simulations.
We anticipate the opening of four postdoctoral positions in 2012 to work on statistical aspects of fracture and plasticity, and in particular on size effects in the fracture of disordered media and in microplasticity. The positions will be funded by the ERC Advanced Grant 2011, SIZEFFECTS.
We look for candidates with a strong background in one or more of the following areas:
- statistical mechanics (scaling, critical phenomena, disordered systems)
- numerical modeling fracture
- dislocation dynamics simulations
- molecular dynamics simulations of mechanical properties of solids.
I've recently had the opportunity to take another look at plasticity in the large deformation context. I've avoided going into geometric and other issues involved with multiplicative deformations (points stressed in earlier blog posts by Giovanni (http://imechanica.org/node/11545), Arash (http://imechanica.org/node/11623) and Xiabo (http://imechanica.org/node/11599). Attached are some old notes that I'd prepared some years ago to help me with the details. I hope they're of use to other students of mechanics.
EXTENDED ABSTRACT SUBMISSION: Nanobrücken II: A Nanomechanical Testing Workshop, March 22-23, 2012, INM Saarbrücken, GermanySubmitted by Oden Warren on Fri, 2012-01-13 15:18.
You are cordially invited to attend Nanobrücken II: A Nanomechanical Testing Workshop, jointly presented by INM - Leibniz Institute for New Materials and Hysitron, Inc., with co-sponsorship from the JEOL company. This is the second workshop in the Nanobrücken series. The workshop's scope has been broadened, and the abstract submission deadline is now February 19, 2012.