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Hello all,

I want to simulate loading of 2D RVE of dual phase steels, by giving individual phases properties, to get homogenised mechanical properties like yield strength,  % elongation etc, using micromechanics based approach. Litterature shows people have used two kinds of boundary condition viz. Periodic boundary condition and homogenous boundary condition for this case. My doubt is two folds:

1) What is the theoretical difference between these two kinds of boundary conditions? 

I am modelling a very simple 2D contact problem between a rigid indenter and a deformable squared-shape specimen. I used a implicit function f to describe the rigid indenter. 

The contact condition is: Inside the contact zone of the deformable specimen, a node n is outside of rigid indenter for f(n)>0, and inside for f(n)<0. In case f(n)=0, the contacting node lies on the surface of the rigid body.

The critical buckling load is given by Pcr=n² * (pi² * E*I)/L² where L is effective length.But what does the n refer to?Is it the number of buckling modes we want to see or some numbers depending upon the end fixity conditions?

I did a 2D beam bending problem with CST and Q4 element, respectively. CST gives better accuracy. Is it due to the shear locking effect with Q4?

Hi Friends,

I am currently writing my thesis in riser of marine and i want to model a Thermoplastic composite pipe with e glass fibers. In the pervious version of ansys they have used the shell elements 99 but in ansys 14.5 the shell element does not exist , i want to that shell element shell 181 have the similar properties of shell 99? or which other element type can be used for composite pipe ?

Thanks in advance. 

Regards,

Amit