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"bending stress-strain curve" or "compression stress-strain curve"?

Submitted by mahmood seraji on

Hi 

I want to model the lightweight slab and since i do not have the material behaviour of the slab, i have to do testing. i was searching in internet and i got two different concept: "bending stress-strain curve" and "compression stress-strain curve". i do not know which one should i follow? and is there any difference?

Regards.

puzzle in the asymmetric four-point-bend sepcimens.

Submitted by pflines on

HI, everyone,

 This is pflines, i am working on the mode I\II fracture toughness.

i want to use the asymmetric four-point-bend sepcimens to get the value of KI and KII,

 but did not found a clear formulation to caculate the KI and KII,

 anyone could help me?

convergence difficulty due to the stiffness degradation in Abaqus

Submitted by morteza roostaei on

Hello everybody

I am simulating hydraulic fracturing operation with Abaqus. I have used cohesive elements and also utilized viscous regularization to cope with convergence difficulty. However, the problem still persists. Should I stick to regularization technique or should I write a user subroutine that will allow more flexibility. 

  Thank you

Fracture of electrodes in lithium-ion batteries caused by fast charging

Submitted by Kejie Zhao on

During charging or discharging of a lithium-ion battery, lithium is extracted from one electrode and inserted into the other.  This extraction-insertion reaction causes the electrodes to deform.  An electrode is often composed of small active particles in a matrix.  If the battery is charged at a rate faster than lithium can homogenize in an active particle by diffusion, the inhomogeneous distribution of lithium results in stresses that may cause the particle to fracture.  The distributions of lithium and stress in a LiCoO2 particle are calculated.  The e

spring in Abaqus

Submitted by mahmood seraji on

Hi

I am modelling two plates that have been attached to each other using screws. i have modelled some springs for the screws. the shell element has been used for the plates. i want to assign the spring element (say SPRINGA) for the screws but i do not know how.

thank you.

Physicists Won 2010 Nobel Prize for Discovery of Graphene

Submitted by Teng Li on

As announced on 5 Oct. 2010, Andre Geim and Konstantin Novoselov of the University of Manchester won the 2010 Nobel Prize in physics "for groundbreaking experiments regarding the two-dimensional material graphene". Geim and Konstantin first reported the experimental observation of graphene in 2004 .  Novoselov, 36, is also the youngest physics laureate since 1973.