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PolyFEM: Obtaining polygonal mesh from structured T3 Mesh

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Hello,

I am developing a solver implemeting Polygonal Finite Element Method (PolyFEM). Currently my code can handle n-gons with nmax=6 (hexgon).

I am trying to test the code with comlex geometries for which I need to obtain polygonal meshes. PolyMesher developed by Dr Paulino's group can obtain polygonal mesh using voronoi doagrams but the code doesn't provide control over the maximum number of edges of a polygon in mesh and ends up creating octagons etc. Hence I am thinking of using a code which can convert a structured  T3 mesh into hexagonal mesh.

mohsenzaeem's picture

Quantitative phase-field crystal modeling of solid-liquid interfaces for FCC metals

This work deals with the quantification and application of the modified two-mode phase-field crystal model (M2PFC; Asadi and Asle Zaeem, 2015) for face-centered cubic (FCC) metals at their melting point. The connection of M2PFC model to the classical density functional theory is explained in this article. M2PFC model in its dimensionless form contains three parameters (two independent and one dependent) which are determined using an iterative procedure based on the molecular dynamics and experimental data.

bohrapankaj's picture

Why Natural Frequency of Functionally Graded Material Plate decreases with increase in temperature

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Dear Colleges i want to know why natural frequency of FGM plate reduces with increase of temperature 

Asymmetric stress strain response

Hello,

I need advice about how to model the asymmetric plastic response of POM in Abaqus?

The yield point in tension is 70mpa and 120mpa in compression. Also the elastic behaviour of the POM is very nonlinear and visco.

Please advice how to model these behaviors in Abaqus.

 

Best regards 

Ali

Moving load on roller coaster track

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Hi friends

I have model roller coaster track in Adams software and i have obtained force-time history but i do not now how to apply this history in abaqus.

  Any help will be greatly appreciated.

Insert cohesive element between every two elements

Hello everyone

I am wondering how to insert the cohesive element between every two solid elements in Abaqus, such that each element can separate with others? Is there a tool can do this and generate Abaqus input file?

Thanks

Mirkhalaf's picture

Post yield response of amorphous polymers under different stress states

In this contribution, an elasto-viscoplastic constitutive model based on the single mode EGP (Eindhoven Glassy Polymer) model is proposed to describe the deformation behaviour of solid polymers subjected to finite deformations under different stress states. The material properties of the original model are determined and calibrated from a uniaxial compression-loading test. Then, several numerical examples under different stress states are presented to illustrate the limitations.

Arash_Yavari's picture

The Anelastic Ericksen's Problem: Universal Eigenstrains and Deformations in Compressible Isotropic Elastic Solids

The elastic Ericksen's problem consists of finding deformations in isotropic hyperelastic solids that can be maintained for arbitrary strain-energy density functions.  In the compressible case, Ericksen showed that only homogeneous deformations are possible. Here, we solve the anelastic version of the same problem, that is we determine both the deformations and the eigenstrains such that a solution to the anelastic problem exists for arbitrary strain-energy density functions. Anelasticity is described by finite eigenstrains.

Jinxiong Zhou's picture

Predicting origami-inspired programmable self-folding of hydrogel trilayers

Imitating origami principles in active or programmable materials opens the door for development
of origami-inspired self-folding structures for not only aesthetic but also functional purposes. A
variety of programmable materials enabled self-folding structures have been demonstrated across
various fields and scales. These folding structures have finite thickness and the mechanical
properties of the active materials dictate the folding process. Yet formalizing the use of origami

mohsenzaeem's picture

Formation path of delta hydrides in zirconium by multiphase field modeling

A multiphase field model is developed to study the effects of metastable ζ and γ hydrides on the nucleation and growth of the stable δ hydrides in α zirconium matrix.  Acta Materialia 123 (2017) 235-244 

Wenbin Yu's picture

A Better Alternative to RVE Analysis

RVE analysis is popular for computational homogenization. It can be used independently for virtual testing or as a module for multiscale modeling. Its popularity is mainly due to the maturity and acceptance of commercial finite element software. RVE analysis usually requires a 3D domain to obtain 3D properties and local fields. If a 2D RVE is used, only 2D properties and local fields are obtained. To obtain the complete set of properties, multiple analysis is needed. For example, to obtain the complete stiffness matrix, six 3D RVE analyses are needed.

Mohr Coulomb plasticity model

Hello everyone,

 

I am trying to implement a Mohr Coulomb plasticity model(no hardening at the moment) for the plane strain case. However, the results are not making so much sense.

I was wondering if any of you have tried to code this material model successfully before, or if you could provide me with some algorithm or reference which you know works properly.

 

Thank you.

Setareh

deformation gradient tensor

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I am working on a SPD (Sever Plastic Deformation) process using a dynamic Explicit simulation in ABAQUS software.

I have a question which every respected answer will be appreciated:

How can I get the deformation gradient tensor provided byABAQUS?

Thanks in advance.

Ramathasan Thevamaran's picture

Dynamic creation and evolution of gradient-nano-grained structures in single-crystal metallic microcubes

In an article published today in Science, we have demonstrated the creation of an extreme gradient-nano-grained (GNG) structure in single-crystal microcubes through high-velocity impact. We use the defect-free single-crystal silver microcubes, synthesized using a seed-growth process, as the model system, and fire them at supersonic velocities onto a rigid target to create the GNG structure.

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