【摘要】 采用一种非线性声学共振方法检测碳纤维增强(carbon fiber reinforced polymer,CFRP)复合材料板中的冲击疲劳损伤.通过摆球冲击装置向复合材料试样引入冲击疲劳损伤,并进行非线性声学共振测试;建立相应的冲击疲劳模型,对复合材料进行冲击疲劳损伤的评估和剩余疲劳寿命的预测.结果表明:由于冲击疲劳损伤,共振频率逐渐减小,并且相对频率偏移与激励电压有着良好的线性关系;非线性参数|α_f|随着冲击疲劳寿命N/N_f的增长而增长,在初期阶段|α_f|缓慢增加,并在冲击疲劳寿命的80%之后迅速递增,直至材料失效.更多还原

【Abstract】 A nonlinear acoustic resonance method was employed to detect the impact fatigue damage in CFRP(carbon fiber reinforced polymer) composite plates. Impact fatigue damages were introduced into the composite specimens by a pendulum impact device, and the nonlinear acoustic resonance measurements were constructed on the specimens. Besides, a corresponding impact fatigue model was established to evaluate the impact fatigue damage and predict the residual fatigue life of composite. The results showed that the resonance frequency decreased gradually due to the impact fatigue damages, and the relative frequency shift had a good linear relationship with the excitation voltage. The nonlinear parameter |α_f| increased with the increasing impact fatigue life N/N_f, |α_f| increased slowly in the initial stage, and increased rapidly after 80% of the impact fatigue life before the failure of the material.更多还原