载荷作用下EPS混凝土中弹性波传播特性研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (7) : 69-75.

论文

徐松林，方春艳，周伟达，郑航，周李姜

作者信息 +

Investigation of elastic wave propagation in EPS concrete under compression loading

XU Song-lin, FANG Chun-yan, ZHOU Wei-da, ZHENG Hang, ZHOU Li-jiang

Author information +

文章历史 +

摘要

应用EPS混凝土来模拟含缺陷的岩石材料。对EPS粒径分别为1、2和3mm的三种EPS混凝土试样进行了载荷作用下不同频率的弹性波传播实验研究。采用单一频率脉冲叠合的方法来精确确定材料的波速，结果表明：EPS混凝土的p波波速随载荷增加在试件的开始压密实阶段有较明显的增大趋势，当试件相对密实，波速增加不是很明显；s波波速随载荷增加有一定程度增加，但幅度比p波波速增加得小得多。应用一种相对波速的方法，即将波速与当前载荷下材料的声波速度进行对比，可以较好地分析波速与载荷和频率的关系。最后对波速与载荷和频率的关系进行了理论模拟分析。此研究对于应用弹性波进行材料和结构的无损检测等技术方面有很好的参考意义。

Abstract

EPS concrete is taken as model material for rock sample with defects at the meso scale. Series of experiments of elastic wave propagation are conducted in the present paper to investigate three kinds of EPS concrete samples, with EPS particle diameters 1mm, 2mm, or 3mm, under different frequencies and axial loads. A so-called Pulse Echo Overlap method (PEO) is employed to accurately determine the wave speed of sample at single frequency. Results show that p wave speed of EPS concrete sample increases obviously with loads increasing at the initial densification stage, and it increases slightly when the sample is compressed densely; s wave speed increases with loads increasing, but its increasing amplitude is much lower than that of p wave. A relative speed method, which comparing wave speed to real-time sound speed of material under loading, is proposed to analyze the relationship of speed to loads and frequencies. The model simulation is henceforth conducted on a dimensional theory to reveal relationship of wave speed to loads and frequencies. It is meaningful and helpful for non-destructive testing of materials and structures.

导出引用

徐松林，方春艳，周伟达，郑航，周李姜. 载荷作用下EPS混凝土中弹性波传播特性研究[J]. 振动与冲击, 2016, 35(7): 69-75

XU Song-lin, FANG Chun-yan, ZHOU Wei-da, ZHENG Hang, ZHOU Li-jiang. Investigation of elastic wave propagation in EPS concrete under compression loading[J]. Journal of Vibration and Shock, 2016, 35(7): 69-75

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