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How the pressure in ANSYS is implemented?

Submitted by Breslavsky on
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There are several possibilities for the realization of the presure load.

For
example, when I apply a pressure to an area (lets say, thin rectangular
plate) the area of the plate grows during the deformation process. One
possibility is to keep the pressure per unit area constant (in this case
the total force acting on a plate grows during the deformation) and the
second is to keep constant the total force acting on the plate (in this
case the force per unit area decreases with the deformation). I looked

Acta Mechanica Sinica, Vol.30, Issue 3, 2014 is online now!

Submitted by CSTAM_Journal on

Dear everyone!

The third issue in 2014 (Volume 30, Issue 3) of Acta Mechanica Sinica (AMS) is now online.

Welcome to this SCI-indexed journal http://ams.cstam.org.cn for rapid publication of your exciting results.

_______________________________________________________________________________

Phase-field modeling and simulation of fracture in brittle materials with strongly anisotropic surface energy

Submitted by Bin_Li on

Crack propagation in brittle materials with anisotropic surface energy is important in applications involving
single crystals, extruded polymers, or geological and organic materials. Furthermore, when this anisotropy
is strong, the phenomenology of crack propagation becomes very rich, with forbidden crack propagation
directions or complex sawtooth crack patterns. This problem interrogates fundamental issues in fracture
mechanics, including the principles behind the selection of crack direction. Here, we propose a variational

Problem in steel connection model using abaqus

Submitted by Mutaz A. Al Hijaj on

Hello Everyone,

I'm trying to model an extended shear tab connection using ABAQUS 6.13-2, I've tried to model 4 connections and I compared the results I've got with the experimental work, and I noticed that the FEA is way stiffer that the experimental work, I have only one warning and it says "If significant clearance/overclosure exists between surface pair (assembly__pickedsurf579,assembly__pickedsurf580) and the master surface does not have rotational degrees of freedom, adjustment is recommended for correct enforcement of the tie constraint"

Compression buckling of polymeric beam/column

Submitted by GiacomoMoretti on

Hello,



I have a problem with a stacked colum of elastomeric membranes (natural rubber or silicone).



I am looking for a compression buckling criterion that applies for hyperelastic materials in presence of large deformations (up to 400%).



I've read about Haringx formula, that should apply for these materials, but I suspect that it is valid for small strains only.



My question is:



- is there a suitable buckling criterion for this case?



Nonlinear stiffness for cohesive behaviour

Submitted by noble350 on
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Hi all,

 Does anyone know how to define nonliner (or exponential) stiffness for cohesive behaviour (for ascending branch before damage)? In CAE it's only allowed to enter one value

 Thanks

 Mo

Deformation gradient change in Abaqus

Submitted by ratgem.shetty on

Help needed!! in Abaqus

I have UMAT written to update stress and material tangent components for a user defined material model. I need stretch ratio as an input for my material model. For this I am using deformation gradient from UMAT. Problem is, when there is constant strain (strain rate = 0), for example when material stretched to 100% strain (rubber) and then held at that strain for certain time to see stress relaxation, the deformation gradient should give the same value of 100% strain, but to my surprise this is changing. Can any one help me with this.