Abstract
The growth behavior of intralaminar fatigue cracks in a unidirectional carbon/epoxy laminate, Toray T300/#2500, was studied under mixed-mode loading with a ratio of mode II stress intensity factor (SIF) to mode I SIF equal to 2.50. Under a constant value of the applied SIF range, ΔKIap, the crack propagation rate decreased with the crack extension because of crack-tip shielding by crack bridging. For each value of ΔKIap, the relationship between the crack propagation rate, da/dN, and the crack extension, Δa, was expressed by the following equation: log(da/dN)=log V0-Δa log V1, where V0 and V1 are functions of the applied SIF value. The value of V0 which is the crack propagation rate without crack bridging was approximated by a power law function of the crack-tip value of the SIF range, ΔKItip. On the basis of the power law relationship, a method for evaluating the shielding SIF range, ΔKIbridge, was proposed. ΔKIbridge monotonically increased with the crack extension. Futhermore, ΔKIbridge for a small ΔKIap value was higher than that for a large ΔKIap value when compared to the same amount of crack extension.
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