STRESS LEVEL MONITORING IN STEEL TENSION ROD BASED ON ULTRASONIC GUIDED WAVE TECHNIQUE
Aim at the deficiency of steel structure online stress monitoring,a new method of online stress monitoring based on theory of nonlinear acoustoelasticity guided ultrasonic waves was proposed.The disperse curves longitudinal L (0,1) mode and flexural F(1,1) mode in different stress level were drawn by using acoustoelasticity motion equation and Pochhammer frequency equation.According to the disperse curves,the optimum frequencies of excitation wave were obtained,which are ranging from 30 kHz to 75 kHz,and group velocity of L (0,1) mode and F(1,1) mode in different stress level were calibrated for 30 kHz,45 kHz,60kHz and 75 kHz.The results show that both L (0,1) mode and F(1,1) mode guided wave group velocities decrease linearly with the increasing of stress in the steer bar.Acoustoelastic effect of the above mentioned four frequencies in different stress level were simulated by finite element;the results are consistent well with the theoretical curves,it prove that stress level in steel bar can be tested by ultrasonic guided wave technique.
steel tension rods nonlinear guided ultrasonic waves acoustoelasticity stress level nondestructive testing
B.Wu F.Liu C.F.He
College of Mechanical Engineering & Applied Electronic Technology,Beijing University of Technology, Beijing 100124, China
国际会议
The Third International Conference on Heterogeneous Material Mechanics(第三届国际非均匀材料力学会议)
上海
英文
957-960
2011-05-22（万方平台首次上网日期，不代表论文的发表时间）