research

Journal of Microelectromechanical Systems

Ping Du; Chen Cheng; Hongbing Lu; Xin Zhang

Volume: 22, Issue: 1, Page(s): 44 - 53


DOI: 10.1109/JMEMS.2012.2213070

Dear all.

I'm currently doing some research concerning crack path prediction in brittle thin film.

But I'm struggled to find efficient way to do it.

In reality my case: stress is higly confined within semi infinite narrow rectangular strip patten and out of this rectangular, stress is very low or near 0 compared to stress within the pattern. Crack starts from left side end and propagates within pattern toward right end side of pattern. Crack show wavy propagation behavior with regular period and amplitude. 

Hi everybody,

I'm trying to model a 2D orthogonal cutting by Abaqus by using ALE method. I have some distortion of mesh in front of the cuuting noise so I try to define an eulerian surfaces around the cutting noise. 

Can somebody help me to find about the convergence rate of MLS shape function?

My name is hexu,a graduate, my major is solid mechanics,eapecially micromechanics,also study finite element method.

Dear all!

For quite a long time (not full time though)  I've been trying to get a multi-surface plasticity model running, without finally successing. Yet.

I am coding the algorithm Simo & Hughes give in "Computational Inelasticity" in Box 5.2a-c  into an Abaqus-umat written in fortran. I apply it for perfect plasticity (at the moment), therefore it is simplified from the original.

I am working on reinforced fiber composites, after modelling the unit cell(R.V.E) of the composite various boundary conditions are applied. After this result is obtained. The results are element(elements produced after meshing)-oriented. I want the stress as a whole on the whole unit cell. I have tried measuring the forces on the faces by taking the cumalative of nodal forces on each face. However, the common edges creates a problem. Can you suggest any other methos of calculating the stress on whole body.

The assignment:Determination of crack propogation direction for CT specimen using different theories such as MTS,MTPS,Del-criteria,T-criteria,Ip theory

using ansys multiphysics

1) What are the boundry condition to be used for above criteria

2) How to take care of mixed mode loading