Table 3 Material stiffness degradation criterion
From: Bionic design based on micro-nano structure of osteon and its low-velocity impact damage behavior
Damage mode | Degradation criteria |
|---|---|
Matrix tensile failure(σ22 ≥ 0) | Q0 = 0.2Q(Q = E22, G23, ν12) |
Matrix compression failure(σ22 < 0) | Q0 = 0.4Q(Q = E22, G23, ν12) |
Fiber tensile failure(σ11 ≥ 0) | Q0 = 0.07Q(Q = E11, G23, ν12) |
Fiber compression failure(σ11 < 0) | Q0 = 0.2Q(Q = E11, G23, ν12) |