Characterization of impact fatigue damage in CFRP composites using nonlinear acoustic resonance method
Characterization of impact fatigue damage in CFRP composites using nonlinear acoustic resonance method
复制标题
使用非线性声共振法表征 CFRP 复合材料的冲击疲劳损伤
DOI：
10.1016/j.compstruct.2020.112804
复制
发表时间：
2020-12-01
影响因子：
6.3
通讯作者：
Xie, Weihua
中科院分区：
文献类型：
--
作者：
Wei, Qin;Zhu, Liyong;Xie, Weihua
碳纤维增强塑料（CFRP）复合材料在冲击载荷作用下会产生冲击疲劳损伤，而传统的无损检测技术很难检测到CFRP复合材料的渐进疲劳损伤。本文提出了一种非线性声共振方法来表征CFRP复合材料的冲击疲劳损伤。基于非均质材料的迟滞非线性特性，建立了复合材料冲击疲劳损伤评估和剩余使用寿命预测的疲劳模型。在此基础上，对CFRP复合材料进行了摆锤冲击实验，并通过非线性声共振测量来评价冲击疲劳损伤。此外，用红外热像仪和光学显微镜对CFRP复合材料的冲击疲劳损伤进行了检测。结果表明，由于刚度退化，谐振频率发生漂移，且相对频率漂移与激励电压和应变变化呈良好的线性关系。此外，损伤指数在冲击循环开始时缓慢上升，当冲击疲劳寿命超过70%时迅速增加。实验结果表明，用非线性声共振方法表征CFRP复合材料的冲击疲劳损伤是一种有效、可靠的方法。
Accidental impacts may induce impact fatigue damage in carbon fiber reinforced plastic (CFRP) composite and the progressive fatigue damage is difficult to detect by traditional non-destructive techniques. In this work, a nonlinear acoustic resonance method was proposed for characterizing the impact fatigue damage in CFRP composites. Based on the hysteretic nonlinearity of heterogeneous materials, a fatigue model was constructed to evaluate the impact fatigue damage and predict the residual service life of the composite material. Thereafter, experiments of pendulum impact were conducted on the CFRP composites and nonlinear acoustic resonant were measured to evaluate the impact fatigue damage. Additionally, the impact fatigue damage in the CFRP composites was inspected by an infrared thermography and an optical microscopy. The results indicate that the shift of resonance frequency occurs due to the stiffness degradation and the relative frequency shift has a good linear relation with excitation voltage and strain change. In addition, the damage index rises slowly at the beginning of the impact cycle and rapidly increases when the impact fatigue life exceeds 70%. The experimental results demonstrate that characterizing the impact fatigue damage in CFRP composites using nonlinear acoustic resonance method is an effective and reliable approach.