Equivalent modulus for composite plate?
Equivalent modulus for composite plate?
(OP)
Hi,
"first,Sorry for the mistakes"
I begin in analysis composite and i want calculate the equivalent modulus of the plate composite(carbone/epoxy) (sequence.0°,45°,0°).
I calculate the global stiffness matrix (A, B, and C)
i found a formul in composite stress manuel to calculate the equivalent modulus. For exemple, for Exx
Exx=(A11*A22-A12^2)/A22*h
with h tickness of the plate
The result is good for me with this sequence but when i increase the plies number, the Ex and Ey modulus decrease and vice versa.
i find it's strange.I think this formulation isn't correct but i don't found the mistakes.
Can you help me please.Thanhs
"first,Sorry for the mistakes"
I begin in analysis composite and i want calculate the equivalent modulus of the plate composite(carbone/epoxy) (sequence.0°,45°,0°).
I calculate the global stiffness matrix (A, B, and C)
i found a formul in composite stress manuel to calculate the equivalent modulus. For exemple, for Exx
Exx=(A11*A22-A12^2)/A22*h
with h tickness of the plate
The result is good for me with this sequence but when i increase the plies number, the Ex and Ey modulus decrease and vice versa.
i find it's strange.I think this formulation isn't correct but i don't found the mistakes.
Can you help me please.Thanhs





RE: Equivalent modulus for composite plate?
Ex = 1/(a11*h)
where [a] = inv[A]