基于散射信息的铸件不同角度裂纹缺陷全聚焦成像研究

Study of Crack Defects in Castings at Different Angles Based on Scattering Information by Total Focus Method

裂纹缺陷严重影响铸件质量,因铸件服役过程中受力角度不同,不同角度裂纹对其质量影响的程度有所不同,因此需要对裂纹角度进行判断。本文选用仿真结合试验的方式,采用相控阵超声检测手段对不同角度裂纹进行成像分析。首先通过有限元仿真对缺陷散射信息进行提取,建立裂纹角度与散射角度之间的关系,最终通过全数据采集及全聚焦成像对裂纹角度进行判断。结果表明,在裂纹角度较小时,试验结果与仿真结果一致,裂纹角度较大时可通过本文建立的角度对应关系进行判断。

Crack defects seriously affect the quality of castings,the effects of different angles of cracks are different,so it is necessary to judge the crack angle.In this paper,we choose the simulation combined with experimental method,using phased array ultrasonic test(PAUT)means to analyze the imaging of cracks at different angles.Firstly,the defect scattering information is extracted by finite element simulation,the relationship between crack angle and scattering angle is established,and finally the crack angle is judged by full data acquisition and full focus imaging.The results show that the experimental results are consistent with the simulation results when the crack angle is small,and when the crack angle is large,it can be judged by the angle correspondence established in this paper.