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06-06-2016 12:16 PM

I am trying to plot the margin of safety for a composite laminate. I have created an envelope case that combines the major pricipal stresses of all plies in the laminate.

Then I have tried to use the calculate function on the envelope case to determine the margin of safety.

I am using the following equation for the calculate function which basically is the following equation:

MS = (Material Allowable/Stress)-1.

(MAT(MLAM(PID(!i); **PLYID**);52)/(VEC(3;90000000;!i))-1)

I was wondering how can I modify the equation so that the Margin of Safety equation takes into account all the plies and gives me a margin of safety.

I was trying to use the equation provided here; however for laminates the function "**MID(propID)**" does not work (http://mechanicalengineeringblog.tumblr.com/post/117691398404/margin-of-safety-calculation-with-fema...).

Any help is appreciated.

Regards,

Saptarshi

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