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What is stress? Who has ever seen stress? Is stress a physical quantity?(second section) Let us re-consider an example for metal foam as show n Figures 1(a,b) that show the local flexuosity under cycle compression loading. Previous researchers used the effective elastic moduli theory and the effective stress concept to study this kind of problem. However, who know what are the approximate stresses at any point in the form, say, at the points A, B, A’, B’?

For a steady shock wave, since we know Rankine–Hugoniot relations,and Equation of state,

from downstream values, we can directly calculate upstream values, we know all the quantities, density, particle velocity, specific energy are functions of z (where z=x-ct), but, how to relate these quantities to z, and how to plot a S-Shape curve like density vs. z.  

Helllo,

My research consist to anlyse the effect of impact at low velocity in 3D composite model by using the F.E modeler Abaqus 6.9.1

if any one can help at my study I hope that exist it makes me happy.

thanks.

The present study is motivated by two classes of seemingly contradicting experiments on the effect of humidity or the capillary effect on adhesion. While one class of experiments suggests strong effect of humidity in gecko adhesion, those on micromachined surfaces indicate that the adhesion energy remains constant up to a relative humidity of 60–70% even for hydrophilic surfaces. To resolve this apparent paradox, we perform numerical simulations of the vertical peeling of a spatula pad adhered to a rough surface with periodic attachment sites.

Hello,

I want to do transient analysis of piezoelectric actuator with varying preload acting on it in ANSYS. I really dont know how to proceed with.  Can anybody suggest me how to proceed with some apdl examples.

Thank you

S Premkumar