| 激光声表面波检测黏弹性平板裂痕有限元模拟 |
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| 引用本文： | 孙宏祥,许伯强,钱荣祖. 激光声表面波检测黏弹性平板裂痕有限元模拟[J]. 江苏大学学报(自然科学版), 2010, 31(3). DOI: 10.3969/j.issn.1671-7775.2010.03.023 |
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| 作者姓名： | 孙宏祥 许伯强 钱荣祖 |
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| 作者单位： | 江苏大学,理学院,江苏,镇江,212013 |
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| 基金项目： | 江苏省高校自然科学研究项目(08KJB140003,07KJB140019) |
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| 摘 要： | 基于平面应变理论和频域动力学平衡方程,在频域中建立黏弹性平板表面激光激发声表面波的有限元数值模型.在分析材料的黏性特征对Rayleigh波传播特征影响的基础上,模拟了Ray-leigh波在黏弹性平板表面裂痕处发生的声波反射及模态转换的过程,进而计算了表面裂痕的位置及深度.模拟结果表明,激光Rayleigh波通过表面裂痕发生了明显的反射,并相继产生了两个反射Rayleigh波RR及RS,通过研究反射Rayleigh波RR及RS产生的物理机理,可以判定其表面裂痕的位置及深度,从而为定量检测黏弹性材料表面的缺陷提供理论依据.
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| 关 键 词： | 激光 Rayleigh波 有限元方法 裂痕检测 黏弹性 数值模拟 |
Finite element simulation of laser-generated Rayleigh waves for detecting cracks on viscoelastic plate |
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| Sun Hongxiang,Xu Baiqiang,Qian Rongzu. Finite element simulation of laser-generated Rayleigh waves for detecting cracks on viscoelastic plate[J]. Journal of Jiangsu University:Natural Science Edition, 2010, 31(3). DOI: 10.3969/j.issn.1671-7775.2010.03.023 |
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| Authors: | Sun Hongxiang Xu Baiqiang Qian Rongzu |
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| Affiliation: | Faculty of Science/a>;Jiangsu University/a>;Zhenjiang/a>;Jiangsu 212013/a>;China |
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| Abstract: | Based on the theory of plane strain and the equations of dynamic equilibrium in the frequency domain,a finite element model for simulating laser-generated Rayleigh waves on the viscoelastic plate was developed.The effects of material viscoelasticity on the characteristic of Rayleigh waves were analyzed.The interactive process of reflection and mode-conversion of the Rayleigh waves on the surface-breaking crack of the viscoelastic plate was simulated in detail.Moreover,the position and depth of the surface-b... |
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| Keywords: | laser Rayleigh waves finite element method crack detection viscoelasticity numerical simulation |
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