The preliminary investigation of heterogeneity in the microzone of composite by the laser ultrasonic probe

Zhang, X. R.; Lin, S.; Liu, C.; Yu, X. B.; Jinz, Y. P.; Zhang, G. D.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1207
Academic Journal
We preliminary investigate the non-homogeneity on a small area within composite by using laser ultrasonic probe. Two kinds of composites are used as samples. One of them is aluminum matrix reinforced by SiC fiber with diameter of 0.156 mm (SiC/Al). The other is polymer matrix reinforced by stain-steel needle with diameter of 0.35 mm (needle/polymer). The non-homogeneity of composite is investigated by measuring the time-of-flight (TOF) of the laser exciting longitudinal (L-) and transverse (T-) waves which propagate within the samples. The influence of the number of fibers on the non-homogeneity of TOF is observed. Results show that, the non-homogeneity of TOF on a small area within a composite can be observed with resolution of 1 ns in time domain and 50 μm in space. The sensitivity of detection of the non-homogeneity by using T-wave is good than by using L-wave. The TOF of T-wave becomes short, while that of L-wave becomes length when the detection point is passing through the point where the fiber or needle is lied in. For the sample with two fibers, the rise and fall of TOF became small. The detail results and discussions will be presented in this article. © 2000 American Institute of Physics.


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