复合材料层压板小质量冲击下分层扩展的接触力阈值识别

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (18) : 145-151.

论文

叶文勋，于哲峰

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Identification of threshold load causing delamination growth in composite laminates subjected to small mass impact

YE Wenxun, YU Zhefeng,

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摘要

识别出层压板小质量冲击下发生分层扩展时的接触力有助于确定导致其损伤的外物冲击能量。由解析模型的分析可知，局部接触刚度降低会引起接触力的突降，而整体弯曲刚度的降低不会产生这个响应特征，只会导致接触力峰值的降低。研发了小质量冲击试验机，对层压板进行多个能量下的小质量冲击试验，由冲击头的响应和层压板冲击点的挠度测量接触力。发现产生明显分层损伤时，接触力在理论的分层阈值处有明显下降，随后继续升高，这种现象可作为冲击中分层扩展的识别方法。由冲击点挠度测量接触力时，为了捕捉到突降信号，采样频率需达到200 kHz，否则只会得到接触力曲线斜率发生变化的结果。

Abstract

It is meaningful to identify the threshold load generating the delamination growth in the determination of the impact energy causing the damage of composite laminates subjected to small mass impact.The simulation results based on the analytical model show that the contact force drops sharply when the local contact rigidity is decreased, while the decrease of flexural rigidity of the whole plate does not introduce this feature into the response.A tester for small mass impact was fabricated and the impact tests were conducted on the laminates with variant energies.The contact force was detected by measuring the impactor responses and the laminate deflection at the impact point.It is shown that the contact force drops sharply at the theoretical delamination threshold load once the significant delamination is generated, and then goes up again.This phenomenon can be employed to identify the growth of delamination during the impact.To capture the sudden drop of the contact force obtained from the plate deflection, the sampling rate should be no less than 200 kHz.Otherwise, one may lose the sudden drop instant of the contact force curve slope.

导出引用

叶文勋,于哲峰. 复合材料层压板小质量冲击下分层扩展的接触力阈值识别[J]. 振动与冲击, 2018, 37(18): 145-151

YE Wenxun, YU Zhefeng,. Identification of threshold load causing delamination growth in composite laminates subjected to small mass impact[J]. Journal of Vibration and Shock, 2018, 37(18): 145-151

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