Engineering & Analysis Methods > Material Strength Composites: Ply Approach

Tsai-Hill margin based on ply mid-plane strain

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Karthik:
Hello,

When calculating ply by ply margins using Tsai-Hill theory, it seems like Hypersizer computes strain for every ply at top, mid and bottom locations and reports the minimum margin of the three. I realized this is the reason I was not able to match the margins with what is calculated by Nx Nastran which only calculates strain at mid-plane of each ply. Is there an option to force Hypersizer to consider only mid-plane strain for margin calculation and report just that in sizing form?

James:
Not in the native failure criteria.

We could write a quick analysis plugin do evaluate ply-based strength criteria with mid-plane ply stress & strain. That would be a super-simple plugin.

-James

Karthik:
Thanks James. That plug in would be really useful. Should I put a formal request for this?

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