A three-dimensional quadratic failure criterion is used [2] to determine if a particular strain vector can be applied to a given laminate. This criterion is represented by an ellipsoid using ∈1, ∈2 and ∈6 as its three axes. A strain vector is safe when its ex tremity lies within the ellipsoid's envelope.
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References
1.
Tsai, S.W. and H T Hahn Introduction to Composite MaterialsLancaster, PA:Technomic Publishing Co. (1980)
2.
Daoust, J. and S.V. Hoa. "HYBRID; Version 5c," Concordia University , Montréal, Québec, Canada (1987 )
