Determine the strength ratio r at the bottom surface of the

Question

Consider a laminate [±45] of the following material:
E₁=  137.8 GPa
E₂ = 10 GPa
G₁₂ = 5.236 GPa
v₁₂ = 0.3
F_1t = 826.8 MPa
F_1c = 482.3 MPa
F_2t = F2c =  68.9 MPa
F₆ = 241.15 MPa

and thickness t_k = 0.127 mm, subject to N_x = N= = 1.0 N/mm. Determine the strength ratio R at the bottom surface of the laminate, using the following strength criteria:

(a) Maximum stress,

(b) Maximum strain,

(c) Interacting failure criterion. Do not adjust for in-situ strength. You are allowed to use a computer program to find the stresses but you must present detailed computations of the R values.