Abstract
The delamination crack growth behavior under iso-thermal and thermo-mechanical fatigue were investigated with unidirectional CF/epoxy laminates. Tests were conducted either in air or in water with double cantilever beam specimens. The crack growth tests were conducted under constant ΔK conditions. In air, the delamination crack growth rates for the iso-thermal fatigue tests were higher for higher temperature, and the crack growth rates for the thermo-mechanical fatigue tests were lower than those for the iso-thermal fatigue tests. The crack growth rates for the in-phase thermo-mechanical tests were lower than those for the out-of-phase thermo-mechanical tests. In water, the crack growth rates for the iso-thermal fatigue tests were higher for higher temperature under high stress ratio. The rates, however, were not monotonically changed with test temperature under low stress ratio. The rates for the themo-mechanical fatigue test were almost the same value as those for the iso-thermal fatigue test whose test temperature was equal to that at the maximum load for the themo-mechanical fatigue test. The most remarkable difference in the growth behavior between present material and the material employed for the 1st report appeared in the thermo mechanical fatigue crack growth tests in air
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