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Forensics: residual stress of fractured part

Submitted by Mike Prime on
research
fracture mechanics
residual stress

I’ll present this below without the answer, in case you want to enjoy a little brain teaser. It is a solid and experimental mechanics problem that, while not terribly practical, I found very interesting:

A part fractures cleanly in two by brittle fracture (no plasticity) under the action of residual and applied stresses. You only have the broken part in front of you, no prior information.

 What were the original residual stresses on the fracture plane?

2nd International Conference on BioTribology (ICoBT2014) - Preliminary Programme Available

Submitted by MMcA2 on
conference

The ICoBT2014 preliminary programme is now available on the conference website. If you register by the 7 March early booking deadline, you will save on the standard rate.
 
For more information and to register, please visit www.biotribologyconference.com. 

Competition for a post-doc position on computational mechanics now open at IMT Lucca

Submitted by marco.paggi on
job
fracture mechanics
computational mechanics
Finite Element Method
photovoltaics

Dear Colleague,

this is to inform you that the research unit MUSAM "Multi-scale Analysis of Materials" (http://musam.imtlucca.it) at the IMT Institute for Advanced Studies Lucca (Italy) has opened 1 Post-doctoral Fellow position (1 year but renewable for a maximum of 3 years in total) on Computational mechanics applied to solar energy materials, related to the ERC Starting Grant CA2PVM

(http://musam.imtlucca.it/CA2PVM.html) and under my supervision.

simulate inclusion-matrix debonding under tensile load with abaqus cohesive element

Submitted by Lang Zhou on
research

Dear all:

  I want to simulate the  inclusion-matrix debonding under tensile load with abaqus cohesive element.But when I added the cohesive element around the inclusion, the stress filed was totally changed. I think it is because the stiffness of the cohesive element (K/G1/G2)was not right. Do you know how to choose it so it will not affect the stress field of the oringinal structrure? or can you give me an example? Thanks very much.

Basic problem in ABAQUS/CAE

Submitted by tanmoy.deb@iit… on
research
ABAQUS/CAE

I am simulating a cube of sides 10 units. I have applied the
load as pressure of 16 units at top. The cube is meshed by usign a
global seed size of 5. It means, there are 9 elements and 27 nodes
(using C3D8R). I have used the material property of steel for instance.
The base of the cube is fixed and the sides are allowed to move
vertically.  Now i want to calculate the nodal force at the centre of
the cube i.e. at the centroid of the cube (not in the centre of any of
the exterior sides). 

 

The question about ABAQUS element: CPS4R

Submitted by ADA on
research

The element is added displacement load in one direction, at the steptime=0, the nodal displacement is zero, and so as the integrated points' strain and stress. However, the internal force NFORC is nonzero. When we calculate internal force by ourselves, it is obtained by the integral for BT*stress. But the stress is zero, how Abaqus calculates the nonzero initial internal force?

The details can be found  in the attachment.

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