玻璃纤维增强聚乙烯树脂热塑性复合材料的冲击定位

IMPACT LOCALIZATION OF GLASS FIBER REINFORCED POLYETHYLENE THERMOPLASTIC COMPOSITE

为解决玻璃纤维增强聚乙烯树脂复合材料(CGF/PE)层合板的冲击定位问题,本文提出了基于光纤传感方法和相关系数法的冲击定位方法。首先将连续的实验区域划分为面积相等的9个部分,进行冲击定位实验,由光纤Bragg光栅(FBG)收集冲击响应信号,经小波阈值方法进行降噪,提取中心波长变化最大值处的时域特征信号,根据计算得到的时域信号相关系数的大小实现对冲击点的定位。结果表明,对于初始划分区域的层合板冲击实验,该方法的冲击定位预测准确率为100%,有效验证了该方法的可靠性。接着,进一步细分实验区域,对该方法的实验精度进行了探究,结果表明,在细分区域的层合板冲击实验中,在70 mm和23.3 mm尺度上,该方法的冲击定位精度达100%,在11.6 mm尺度上达到了87.5%。最后对3种能量下冲击点定位准确率进行了探究,结果表明,70 mm和23.3 mm尺度上准确率达到100%,11.6 mm尺度上达到了87.5%,因此该方法显示出较高的冲击定位预测准确率和工程应用价值。

As far as the application of glass fiber reinforced polyethylene thermoplastic composite(CGF/PE)is concerned,an online impact localization method was presented here based on optic fiber sensing and correlation coefficient method.First,the total experimental impact area of the glass fiber reinforced polyethylene thermoplastic composite laminate was divided into nine parts with equal areas.The impact response signals were collected by fiber Bragg grating(FBG)and de-noised by wavelet threshold method.Then,the time domain characteristic signals were collected at the maximum variances of the central wavelengths and the correlation coefficients of the time domain signals were calculated for impact localization.The result shows that 100%prediction accuracy is achieved for the composite laminate with initial divisions by online impact localization method proposed.Thereafter,the experimental area was subdivided in order to examine the prediction precision of the method.And the results show that the accuracy of 100%is achieved for 70 mm and 23.3 mm scales and 87.5%for 11.6 mm.Finally,the accuracy of the impact point location under three kinds of energies is explored.The results show that the accuracy rate on the 70 mm and 23.3 mm scales is 100%,and the scale on the 11.6 mm scale is 87.5%.High prediction accuracy with good precision is achieved by this method and its application in industry is truly promising.