| 鲁珊珊,吴英思,刘飞.杆中导波声弹性效应分析与数值模拟研究*[J].,2018,37(4):469-474 |
| 杆中导波声弹性效应分析与数值模拟研究* |
| Numerical?simulation and sensitivity analysis of acoustoelastic effect for guided wave in bar |
| 投稿时间：2017-11-30 修订日期：2018-06-26 |
| 中文摘要: |
| 大型钢结构在役应力检测意义重大，基于超声导波声弹性效应进行应力检测具有潜在的优势。本文基于等效弹性常数法研究了杆中超声导波的声弹性效应。通过计算典型钢结构构件钢杆的频散曲线，确定了检测频率范围，对不同工作应力状态下L（0,1）、F（1,1）与T（0,1）模态的群速度值进行了理论分析与数值模拟。结果表明： L（0,1）模态较适合于钢杆轴力检测， F（1,1）、T（0,1）模态声弹性效应较弱，不适合于应力检测； L（0,1）模态的声弹性效应随着频率的增加而减弱；理论分析与有限元计算对声弹性效应的验证都与波结构轴向位移对声弹性效应的判断得到了较好的吻合。 |
| 英文摘要: |
| Aim at the deficiency?of steel structure online stress monitoring, a new method of online stress monitoring based on theory of acoustoelasticity for cylindrical guided wave was proposed. The disperse curves were calculated for φ20 Q235 steel bar, frequency range that are fit for acoustoelastic detection of cylindrical guided wave were optimized. According to acoustoelasticity motion equation and Pochhammer frequency equation, Group velocities of longitudinal L (0, 1) mode, flexural F (1, 1) mode and torsional T(0,1) mode in different stress level were calculated in theoretical equation and finite element simulation, the acoustoelastic coefficients were obtained. The results show that longitudinal L (0, 1) mode guided wave are fit for acoustoelastic axis stress monitoring, flexural F (1, 1) mode and torsional T(0,1) mode is weak for acoustoelastic effect; Acoustoelastic effect of longitudinal L (0, 1) mode is decreasing with the increasing of frequency; the results are consistent well with the theoretical curves, the results of theoretical and finite element simulation were consistent well with axial displacement of mode shapes for acoustoelastic effect. |
| DOI：10.11684/j.issn.1000-310X.2018.04.004 |
| 中文关键词: 等效弹性常数 柱面导波 声弹性效应 应力检测 频散 |
| 英文关键词: effective elastic constant cylindrical guided wave acoustoelastic effect stress monitoring dispersion |
| 基金项目:国家自然科学基金项目 (11662013) |
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