Acoustoelastic Coefficients in Thick Steel Plates under Normal and Shear Stresses
Acoustoelastic Coefficients in Thick Steel Plates under Normal and Shear Stresses
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DOI：
10.1007/s11340-016-0186-6
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发表时间：
2016-07
影响因子：
2.4
通讯作者：
Z. Abbasi;D. Ozevin
中科院分区：
文献类型：
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作者：
Z. Abbasi;D. Ozevin
结构材料完整性的超声监测是利用本构方程中的高阶应变项得到的材料声弹性(超声波速度与应力的关系)。该方法已用于测量薄壁金属在无剪切主应力作用下的残余应力和外加应力。在此，利用超声传感器阵列测量了厚钢板在法向、垂直方向和角度方向的声弹性系数。建立了考虑Murnaghan超弹性的三维材料模型，可以确定板厚度和激励频率对声弹性系数的影响。通过测量三个方向的超声信号，用厚钢板的拉伸载荷对该模型进行了实验验证。数值结果和实验结果在每种方法的测量不确定度内是一致的。1.0 MHz的超声波频率具有最高的分辨率，用于测量通常用于公路桥梁的结构板中的正应力和剪应力。
Ultrasonic monitoring of the integrity of structural materials utilizes the acoustoelasticity of materials (stress-dependence of ultrasonic wave velocity) obtained from the higher order strain terms in the constitutive equations. This method has been applied to measure residual and applied stresses in thin metals under principal stresses without shear. Here, acoustoelastic coefficients are determined in thick steel plates in normal, orthogonal, and angled directions by means of an array of ultrasonic sensors. A three-dimensional material model is developed which includes Murnaghan hyper-elasticity and can determine the effects of plate thickness and excitation frequency on the acoustoelastic coefficients. This model is experimentally validated by tensile loading of a thick steel plate by measuring the ultrasonic signals in three directions. Numerical and experimental results agree within the measurement uncertainties of each method. The 1.0 MHz ultrasonic frequency has the highest resolution for measuring normal and shear stresses in structural plates typically used in highway bridges.