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Hey to imechaica, i am doing my M.E Project in composites.i have done finite element analysis of composite plate with different boundary conditions and  different orientation angle with antisymmetric stacking sequence. i absorve  tip center displacement of cantilever plate is increasing with orientation angle increment and for simple supported plate it decreases.

stacking sequence is [0/-θ/θ/-θ/θ/0] 

please help me to understand this. 

<strong>i'm modeling a three pavement layer with tandem loading in explicite mode. i dont know why aborted that analysing with this message:</strong>

 "The ratio of deformation speed to wave speed exceeds 1.0000 in at least one element. This usually indicates an error with the model definition. Additional diagnostic information may be found in the message file.



Abaqus/Explicit Analysis exited with an error - Please see the  status file for possible error messages if the file exists."

Hi, every one on iMechanica.

I prepare to do analysis for rubber coated metal gasket in compression.

But, I don't know how to define material property.

Please help me.

Thank you in advance.

Looking through books and papers I see an often quoted equation to show that the contact radius (a) of spherical indenter of radius (R) is related to the indentation depth (h):

a= √(R.h)

However, using simple trigonometry of a spherical cap it can be shown that:

a=√(2Rh-h²)

Contact area is very important for use in nanoindentation - however, if it is based on the wrong contact area calculation, then more errors become apparent.