Preliminary investigation of heterogeneity in the microzone of composites by laser ultrasonic probe measurements |
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| Authors: | X.R.?Zhang mailto:xiaorz@public.ptt.js.cn" title=" xiaorz@public.ptt.js.cn" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,S.?Lin,C.?Liu,X.B.?Yu,Y.P.?Jin,G.D.?Zhang |
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| Affiliation: | (1) State Key Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing, 210093, China;(2) State Key Laboratory of Metal-Matrix Composite Materials, Shanghai Jiaotong University, Shanghai, 200030, China |
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| Abstract: | ![]()
We carry out a preliminary investigation of heterogeneity in the microzone of composites by using a laser ultrasonic probe to measure the time-of- flight (TOF) of the laser-excited longitudinal (L-) and transverse (S-) waves that propagate within the samples. The influence of the number of fibers on the inhomogeneity of the TOF is observed. The results show that the heterogeneity of the TOF in a small region within a composite can be observed with a resolution of 2 ns in time and 50  m in space. The S-wave is better than the L-wave for examining the heterogeneity. The change in the TOF for the sample with two fibers is smaller than that for the sample with one fiber. PACS 62.65.+k; 43.35.+d; 42.62.-b; 81.70.Cv; 81.05.-t |
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