Stiffness evaluation and damage identification in composite beam under tension using Lamb waves
Stiffness evaluation and damage identification in composite beam under tension using Lamb waves
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DOI：
10.1016/j.actamat.2005.05.043
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发表时间：
2005-09
期刊：
影响因子：
9.4
通讯作者：
N. Toyama;S. Yashiro;J. Takatsubo;T. Okabe
中科院分区：
文献类型：
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作者：
N. Toyama;S. Yashiro;J. Takatsubo;T. Okabe
本文利用兰姆波精确地研究了正交铺层CFRP层合板在拉伸载荷作用下的刚度变化。杨氏模量作为施加的应变的函数，通过在拉伸试验期间的拉伸模式的速度的原位测量获得。由于0°铺层的硬化和横向裂纹，模量表现出复杂的行为。通过混合物准则分析了刚性对弹性模量的影响，并成功地推导出了裂纹单独对弹性模量的影响。通过包含刚化效应的剪滞分析预测了由于裂缝而导致的实验模量降低。因此，这项研究表明，在现场测量的波速可以定量评估在加载层合板的损伤。在此基础上，提出了一种利用现场波速计算值进行直线定位的新方法。与传统方法相比，定位精度有了很大的提高。
This paper precisely investigated stiffness changes in cross-ply CFRP laminates loaded in tension using Lamb waves. Young’s modulus was obtained as a function of applied strain by in situ measurement of the velocity of the extensional mode during the tensile test. The modulus exhibited a complicated behavior due to stiffening of the 0° plies and transverse cracks. The effect of the stiffening on the modulus was evaluated by the rule of mixtures and the effect of the cracks alone was successfully deduced. The experimental modulus reduction due to the cracks was predicted by a shear-lag analysis including the stiffening effect. Consequently, this study demonstrated that in situ measurement of the wave velocity can quantitatively evaluate damage in the loaded laminates. Furthermore, a new linear location method using the calculated in situ wave velocity was proposed. A dramatic improvement in location accuracy was obtained compared with the conventional method.