CFRP板倾斜冲击损伤的非线性超声评价

Nonlinear Ultrasonic Evaluation of Oblique Impact Damage of CFRP Plate

针对碳纤维增强聚合物(CFRP)板的倾斜冲击损伤检测问题,提出用非线性Lamb波响应进行评估,并应用ABAQUS软件中的Explicit模块,通过有限元法建立了CFRP板受到低速冲击以及损伤后的非线性超声检测的全过程仿真模型,通过低速冲击试验和非线性检测试验验证了模型的正确性。利用此模型进一步研究了冲击角度与检测距离对相对非线性系数(RANP)的影响。研究结果表明:在一定冲击角度区间中,冲击角度的增加会导致CFRP板吸收能量及分层损伤的减小,并进一步导致了RANP的降低,而RANP与检测距离的变化趋势相一致。

For the detection of damage in carbon fiber reinforced polymer under different impact angles,a detection method using nonlinear Lamb was proposed,and a simulation model used ABAQUS software was established,which included low-velocity impact process as well as nonlinear ultrasonic detection process.The correctness of the model was verified by impact test and nonlinear detection test.By changing the impact angle and detection distance separately,the simulation model was used to further study the impact angle and detection distance on the relative acoustic nonlinear parameters(RANP).The research results show that in a certain range of impact angle,the increase of impact angle reduces the damage and energy absorption of the laminate,which also leads to the decrease of RANP.Besides,the detection distance also has an important influence on the amplitude of RANP.