Frequency spectral analysis on AE signals of damage mechanisms in PE/PE composites
The objective of present study is to investigate frequency features of acoustic emission (AE) signals generated by different damage mechanisms in PE/PE self reinforced laminates. Two kinds of specimen pure resin and PE/PE unidirectional laminate were prepared to obtain desired damage modes. AE signals of matrix damage, interface debonding and fiber breakage can be activated by quasi-state tension of LDPE resin, 90 laminate and 0 laminate respectively. Fast Fourier transform (FFT) which can change AE waveforms from time domain to frequency domain was used to obtain frequency information of damage modes. According to frequency spectral analysis, difference of frequency between damage mechanisms is obvious. Frequency distribution of matrix deformation and matrix fracture are below 100 kHz with peak frequency at 40 kHz. Frequency distribution of matrix cracking is about 100-300 kHz with peak frequency at 230 kHz. Frequency of interface debonding has two main regions 50-150 kHz and 200-300 kHz with peak frequency at 100 kHz. Frequency of fiber breakage mainly distribute during 200-300 kHz with peak frequency at 220 kHz. The result revealed frequency feature could be applied to identify damage mechanism in PE/PE composites.
WANG Xu ZHANG Huipin YAN Xiong
Key Lab of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, P.R.China
国际会议
2009 International Conference on Advanced Fibers and Polymer Materials(2009年先进纤维与聚合物材料国际学术会议)
上海
英文
278-281
2009-10-21（万方平台首次上网日期，不代表论文的发表时间）