材料工程Issue(5)：35-38,4.
初始应力对瑞利波无损评价45钢表层应力的影响
Influence of Initial Stress on Surface Stress Measurement of 45 Steel by Rayleigh Wave
摘要
Abstract
Based on Rayleigh wave acoustoelastic theory, surface stress measurement of 45 steel and the influence of initial stress state on stress measurement were introduced. Two Rayleigh wave transducers with 5MHz frequency? The fixed distance, were employed to detect the surface of 45 steel as an emitter and a receiver. The difference in time of flight between free loaded signal and loaded signal corresponding to different tensile stress was determined with normalized cross correlation function. Results show that the influence of initial stress state on relationship between propagation velocity of Rayleigh wave and tensile stress is faint, the propagation velocity of Rayleigh wave increases linearly with tensile stress increasing, when tensile stress attains a value, the relationship between velocity of Rayleigh wave propagating in the surface of 45 steel and tensile stress is nonlinear further. Nominal Rayleigh wave acoustoelastic coefficients corresponding to different initial stress state of 45 steel are obtained, and they are 0. 838 and 1. 041, respectively. The stress corresponding to the maximum difference in time of flight is also different, the relative error of stress measurement corresponding to different initial stress state is about 22$/o.关键词
45钢/声弹效应/瑞利波/拉伸应力Key words
45 steel/ acoustoelastic effect/Rayleigh wave/tensile stress分类
通用工业技术引用本文复制引用
刘彬,董世运,徐滨士,何鹏,闫世兴..初始应力对瑞利波无损评价45钢表层应力的影响[J].材料工程,2012,(5):35-38,4.基金项目
国家自然科学基金资助项目(50975287) （50975287）
国家973项目(2011CB013405) （2011CB013405）
