横向应变对声双折射系数的影响分析
Analysis on the Impact of Transverse Strain on the Birefringence Coefficients
摘 要
以时基延迟效应为基础的声弹法应力测量, 对微小应变都非常敏感。整个加载过程中, 横向微小应变引起的时间差会累积到声时检测设备中, 给应力定量测量带来很大的误差。采用回振法对45号钢在拉伸和压缩状态下的声双折射现象进行了试验研究。在研究超声波垂直于应力传播过程中, 建立了声时差与应力的关系模型, 试验证明了该模型的正确性。利用声速与动弹模量及动泊松比之间的关系, 引入了横向应变对声双折射系数的修正项。
声双折射系数
回振法
应力测试
Transverse strain
Birefringence coefficients
Sing-around method
Stress testing
Abstract
Acoustoelasticity measurement of stress based on the technology of time delay is very sensitive to small strain. In the entire load processes, small time change caused by the transverse small strain may accumulate to the time equipment which shall result in greater error to measurement. When the ultrasonic wave propagating transversely to the applied stress direction, the model of time difference to stress was set up, and the acoustic birefringence phenomena on 45 steel under tension and compression were studied by Sing-Around method. In studying on the ultrasonic wave propagation perpendicular to the stress, one model of relationship between time defense and stress was established, the experiment proved the correctness of the model. The transverse elastic strain birefringence coefficient of acoustic correction term was introduced by using the relationship of velocity both with elastic modulus and with Poisson ratio.
中图分类号 TG115.28
所属栏目 试验研究
基金项目 江苏省重点实验室开放研究基金课题资助项目(SJ05046)
收稿日期 2010/1/20
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备注罗 琅(1980-), 男, 硕士研究生, 工程师, 主要从事超声及TOFD检测
引用该论文: LUO Lang,YAN Hui,DONG Shi-Run,WEI Qin. Analysis on the Impact of Transverse Strain on the Birefringence Coefficients[J]. Nondestructive Testing, 2010, 32(12): 954～957
罗 琅,燕 辉,董师润,魏 勤. 横向应变对声双折射系数的影响分析[J]. 无损检测, 2010, 32(12): 954～957
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参考文献
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【8】Masumi Hasegawa, Yasutoshi Sasaki. Acoustoelastic Birefringence effect in wood I: effect of applied stresses on the velocities of ultrasonic shear waves propagating transversely to the stress direction [J]. The Japan Wood Research society, 2004(50): 47-52
【9】雷正伟, 米东, 徐章遂, 等.超声应力检测中的温度和应变影响分析[J].仪表技术, 2007(6): 33-35.
【2】Tokuoka T, Iwashimizu Y. Acoustical birefringence of ultrasonic waves in deformed isotropic elastic material[J]. Int J Solids Struct, 1968(4): 383-389.
【3】魏勤, 董师润, 徐颖梅.超声纯横波法测试45号钢的内部应力[J].实验力学, 2007, 12(6)588-592.
【4】Hughes D S, Kelly J L. Second-order elastic deformation of solids[J]. Phy Rev, 1953(92): 1145.
【5】Murnaghan F D. Finite deformation of an elastic solid[J]. John Wiley, New York, 1951, 4(5): 45.
【6】LIANG Shan-qing, FU feng. Comparative study on three dynamic modulus of elasticity and static modulus of elasticity for Lodgepole pine lumber\[J\]. Journal of Forestry Research, 2007, 18(4): 309-312.
【7】Smith R T, Stern R, Stephens R W B. Third-order elastic module of polycrystalline metals from ultrasonic velocity measurements[J]. Acoust Soc Am, 1966, 40(5): 1002-1008.
【8】Masumi Hasegawa, Yasutoshi Sasaki. Acoustoelastic Birefringence effect in wood I: effect of applied stresses on the velocities of ultrasonic shear waves propagating transversely to the stress direction [J]. The Japan Wood Research society, 2004(50): 47-52
【9】雷正伟, 米东, 徐章遂, 等.超声应力检测中的温度和应变影响分析[J].仪表技术, 2007(6): 33-35.
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