Abstract This paper investigates the fatigue behaviour of filament wound Toray T700/Epotech X4201 composite pipes with different lay-ups. The present work compares the fatigue behaviour of coupon specimens manufactured with two different fiber orientations under tension-tension and tension-compression cyclic actions. The test results show that the lay-up and stress ratio have significant effect on the failure mechanism and fatigue life of carbon fiber reinforced polymer (CFRP) composite coupons. This paper develops an empirical model, which integrates the effect of stress ratio in a fatigue damage parameter, to evaluate the fatigue life of the CFRP filament wound coupons. Combined with the numerically calculated stresses at the critical locations corresponding to the fatigue damage locations, the proposed empirical model developed from the coupon test database predicts successfully the fatigue life of full diameter CFRP pipes, using stresses computed at critical locations in the CFRP pipe.

中文翻译：

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基于试样试验的长丝缠绕碳纤维复合材料管道疲劳行为及寿命预测

摘要 本文研究了具有不同铺层的长丝缠绕 Toray T700/Epotech X4201 复合管的疲劳行为。目前的工作比较了在拉伸 - 拉伸和拉伸 - 压缩循环作用下使用两种不同纤维取向制造的试样的疲劳行为。试验结果表明，铺层和应力比对碳纤维增强聚合物（CFRP）复合材料试样的失效机理和疲劳寿命有显着影响。本文开发了一个经验模型，该模型将应力比的影响整合到疲劳损伤参数中，以评估 CFRP 长丝缠绕试样的疲劳寿命。结合疲劳损伤位置对应的关键位置处的数值计算应力，