蜂窝夹层结构脱粘缺陷电磁锤敲击检测模型及持力时间分析

Mechanical Model and Contact Time Analysis of Tap Test on Honeycomb Sandwich Structures

为了定量描述蜂窝夹层结构敲击检测中敲击头持力时间与脱粘缺陷直径和面板特性的依赖关系,建立了敲击过程的力学模型,推导和分析了持力时间随缺陷直径和面板拉力的变化情况,并与试验数据做了拟合和比较。结果表明,在拟合的面板拉力取值下,模型计算值与试验值吻合较好。模型可用来计算持力时间的数值和分析持力时间的变化趋势。对于同一面板的脱粘缺陷,持力时间随缺陷直径的增大而增大。对于同种材料面板的相同直径的脱粘缺陷,持力时间随面板厚度的增大而减小。对于同厚度面板的相同直径的脱粘缺陷,复合材料碳环氧树脂面板对应的持力时间短于铝面板。

In tap test on the honeycomb sandwich structures,the contact time of the tapping head changes with the flow sizes and the plates.To quantitively show these relationships,a mechanical model describing the tapping head movement was given.The equation of the contact time varying with the flow diameter and the plate tension was derived.The contact time variations under different tension parameters were given and compared with the experiment data.The result shows that by using suitable tension parameters,the contact time given by the mechanical model agrees with the experiment data.The model can be used to calculate the contact time and analysis its variation.For flows on a same plate,the contact time increases with the flow diameters.For flows with same diameter and on plates with same material,the contact time decreases with the plate thicknesses.For flows with same diameter and on plates with same thickness,the contact time on a FRP plate is shorter than that on an Al plate.