Blog posts

Siple Compression Test With Abaqus Explicit

Submitted by gnoij on Thu, 04/14/2011 - 04:11

Hi, i am trying to test a bulk metallc glass VUMAT with a simple compression test simulation. But since VUMAT is a Abaqus Explicit subroutine, that means I must set my compression simulation with setting of Abaqus Explicit right? So far I only have the experience in conducting compression test simualtion using ABAQUS Standard setting like static general step and surface-to-surface contact (standard). I don't know how to set up a simple compression test simulation with Abaqus Explicit settings, can anyone help me please?

Thanks and regards.

Advanced Courses on Mechanics of Soft Matter, Zhejiang University, Dec 21-27, 2011

Submitted by Chaofeng Lu on Wed, 04/13/2011 - 22:23

research

mechanics of soft matter

NSFC Advanced Courses on Mechanics of Soft Matter 2011

(Zhejiang University, Dec 21-27, 2011)

Discussion of fracture paper #2 - The role of the T-stress

Submitted by ESIS on Wed, 04/13/2011 - 22:00

crack extension

T-stress

J.C. Sobotka, R.H. Dodds: Steady crack growth in a thin, ductile plate under small-scale yielding conditions: Three-dimensional modelling., Engineering Fracture Mechanics, Vol. 78, 2011, pp. 343-363; J.C. Sobotka, R.H. Dodds: T-stress effects on steady crack growth in a thin, ductile plate under small-scale yielding conditions: Three-dimensional modelling., Engineering Fracture Mechanics, Vol. 78, 2011, pp. 1182-1200.

To the discussion

CISM Course: Advanced and Bio-Inspired Nanomechanics

Submitted by Huajian Gao on Wed, 04/13/2011 - 15:48

Hi all,

There will be a 5 day - course on Advanced and Bio-Inspired Nanomechanics at CISM Udine, Italy.

http://www.cism.it/courses/C1107/

http://media.cism.it/courses%2FC1107%2FPugno4___.pdf

- HG

PS. Original flyer on CISM website:

Advanced and Bio-Inspired Nanomechanics

July 18, 2011 — July 22, 2011

Coordinator:

Crack Initiation with UMAT

Submitted by Panos Efthymiadis on Wed, 04/13/2011 - 11:50

research

Plasticity

crack initiation-propagation

Dear all,

I want to model crack initiation and propagation for a user defined material, using Abaqus. When I try to model , I get the following error:

A MATERIAL PROPERTY THAT IS NOT ALLOWED WITH A USER MATERIAL HAS BEEN SPECIFIED

when I take out critical damage initiation, the model works fine; which means that it doesnt allow me to couple UMAT with crack initiation. Does anyone know how to handle this problem?

All the best,

Panos

how to apply a torsional moment to shell made up of composite in ANSYS

Submitted by firozahmed49 on Wed, 04/13/2011 - 05:04

research

HI,
I am performing a non linear buckling analysis in ansys using shell 181 element. My geometry is made up of composite material and has a shell structure. The shell is subjected to torsion at one end so as to buckle throughout it length. the other end is fully constraint.
My problem is how to apply this torsional moment at the free end.
anybody please help me.

Linear and non-linear buckling

Submitted by ramdas chennamsetti on Wed, 04/13/2011 - 03:40

Hi all,

When we do a non-linear buckling analysis, initially we introduce some imperfections (mode shapes of mode 1, 2 etc) from eigen buckling analysis. Then we multiply the load with eigenvalue of the first mode. This load is applied on the structure having imperfections. Now put on non-linear geometric option and run the analysis. At bifurcation point we get non-linear buckling load. Non-linear buckling load comes close to eigen buckling value.

Decription of my problem is as follows.

Abaqus modelling of a finger (orphan mesh)

Submitted by Slayerz on Wed, 04/13/2011 - 03:37

ABAQUS/CAE

Hi all,

I am working with an orphan mesh of a finger made up of:

1) elastic epidermis layer

2) viscoelastic dermis layer

3) hyperelastic fats layer

4) bone

NLGEOM is turned on.

Tie constraints are used between the layers and the bone

I wish to make this finger 'touch' a cubic object however the job always fails as it is not able to converge.

Will anyone be able to advise on this matter?

DNAD, a simple tool for automatic differentiation

Submitted by Wenbin Yu on Wed, 04/13/2011 - 03:04

All,

I am writing to introduce DNAD, a Fortran module I wrote for automatic differentiation of analysis codes written in Fortran including those legacy codes written in Fortran 77. Although only implementation using Fortran 90/95 was carried out, it is straightward to translate it to a language you like such as c/c++.