表面粗糙度对固体内部超声背散射的影响∗OA北大核心CSCDCSTPCD
Effects of surface roughness on diffuse ultrasonic backscatter in the solids
超声背散射法可通过多晶体金属内部的空间方差信号，实现微观结构参数的无损评价，但表面粗糙度对评价模型的精度及实用性存在显著影响.基于高斯声束理论推导垂直入射粗糙界面的纵波声场，以此研究声能的Wigner分布规律；在超声的波长远大于粗糙度的前提下，构造表面粗糙度修正系数，并建立粗糙界面的单次散射响应模型，揭示粗糙度对超声波背向散射的影响规律.用304不锈钢制备轮廓均方根值为0.159µm的光滑试块和25.722µm的粗糙试块开展超声背散射实验，结果表…查看全部>>
In the diffuse ultrasonic backscatter describing the scattering of elastic waves from polycrystalline metal material, the spatial variance of the signal is used as a primary measure of microstructure. Previously, theoretical singly-scattered response models have been developed for the diffuse backscatters of elastic waves within polycrystalline materials, which take into consideration both transducer beams and microstructural scattering information. However,…查看全部>>
宋永锋;李雄兵;史亦韦;倪培君
中南大学交通运输工程学院，长沙 410075中南大学交通运输工程学院，长沙 410075北京航空材料研究院，北京 100095中国兵器科学研究院宁波分院，宁波 315103
超声背散射表面粗糙度晶粒尺寸无损评价
diffuse ultrasonic backscattersurface roughnessgrain sizenondestructive evaluation
《物理学报》 2016 (21)
3D打印钛合金构件孔隙率的超声多次散射无损评价方法
214301-1-214301-11,11
国家自然科学基金(批准号:61271356,51575541)资助的课题
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