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مکانیک::
ماتریس سختی
For a unidirectional lamina, the stiffness matrix, Q , relates the stresses and strains at material point X(*) in reference to the material (natural) coordinates,
The inverse of the lamina stiffness matrix, Q, is referred to as the lamina compliance matrix, S, whose coefficients are given as
in which A), is the stiffness matrix of the system under consideration.
Although this approach achieves near-optimal values, these values are coordinate frame dependent because they depend on absolute values of the global stiffness matrix as stated in the context of the finite element method of Lovie and Metzger (1999).
The construction of the stiffness matrix requires determination of the derivative of PD interaction forces with respect to the relative displacement vector, i\.
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