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First ply failure of composite panels using ABAQUS

Submitted by Ganesh Soni on
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Composites
Buckling and Post buckling
Static Rik's
Tsai-hill craterion

I am using ABAQUS Software for analysis of laminated composite plates (279X279X2.16) and (0/90)4s having 16 plies; trying to perform Buckling and Post buckling analysis using Static Rik’s algorithm.

Firstly, Eigen value analysis is performed in step one, and thus bulking load is predicated.Then Eigen values are incorporated in Static Rik’s Non-linear analysis for imperfection (1% of first Eigen mode,0.05% of second Eigen mode, 0.025% of third mode and 0.025% of forth mode)using edit keywords method.

Journal Club Theme of September 2009: Elasticity and Failure

Submitted by Konstantin Volokh on
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elasticity
failure

Let us consider interaction of two atoms/molecules/particles. The reference distance between them corresponds to zero interaction force and zero stored energy. The interaction passes three stages with the increase of the distance. At the first stage the force increases proportionally to the increasing distance: the linear stage. At the second stage the force-distance relationship deviates from the linear proportionality: the nonlinear stage. At the third stage the force drops with the increasing distance: the separation or failure stage.



The origins of electromechanical indentation size effect in ferroelectrics

Submitted by Pradeep Sharma on
research

The attached paper was recently accepted for publicaiton in Applied Physics Letters. Here we try to speculate on the origins of a type of electromechanical indentation size-effect. Although we have decent supporting evidence, I think that our assertions are still on the speculative side and hope that future experiments can shed further light on this.

Revisiting Quantum Notions of Stress

Submitted by Pradeep Sharma on
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atomistic definition of stress

I plan to submit the attached paper on quantum mechanical definition of stress in the next few weeks. Comments and feedback are welcome. Fair amount of work has been done on stress definition in the context of classical molecular dynamics (also attracting some controversies). In contrast, there appear to be several open issues in the quantum case. Hopefully, the attached paper provides a starting point.

Constitutuive modelling of viscoelastic materials

Submitted by bhargavasista on
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I am currently working on constictutive modelling of soft biological tissues, considering them as nonlinear viscoelastic materials. I am using the split form of energy density function i.e modelling separately the hyperelastc part and the visoelastic part. I am using Ogden formula for hyperelastic part and for the viscoelastic part, I am currently using the second and third invariants of stretch rate tensor.

Iso Chronous curve

Submitted by asit_rathod1 on
research

Thanks Vijay

                  for giving me guide lines but my altimate aim is to the finding of devlopment of iso chronous curve for creep buckling.and for that while studing nonlinear strees strain curve we know that as in non linear stage the what is the value of stress and strain at time T=0 and time T=t? is the any formula for the Et and Es in non linear stress and strain?...and which procedure for calulation foe Et and Es?

Regards

Asit Rathod

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