基于轮廓线法的镁合金构件内缺陷三维反演方法研究

随着对缺陷识别要求的不断提高,对缺陷的形状等特征准确地表征也日益成为研究的热点。将镁合金柱状体作为研究对象,以超声检测为手段,通过借鉴医学中常用的三维显示方法——轮廓线重构法,对研究对象中的缺陷进行三维反演。首先对检测后的信号通过转化极坐标实现缺陷的定位,之后使用轮廓线重构法对每一截面的轮廓实行勾画,通过将每一个轮廓面的中心点确定之后,将中心点相连接构成轴线,将每一个轮廓面连接,实现缺陷的三维反演。通过和研究对象进行比较分析,结果证明,轮廓线重构法可适用于4 mm的缺陷反演。

Research of three-dimensional inversion defects within the magnesium alloy component based on contour method

With the increasing requirements defect recognition, shape and other characteristics of the defects are also increasingly accurate characterization has become a hot research. This article will columnar magnesium alloy body as the research object to ultrasonic testing as a means commonly used in medicine by drawing a three-dimensional display method - contour reconstruction method for the study of defects in three-dimensional inversion. Firstly, the detected signals by the polar coordinate transformation to achieve positioning defects after reconstruction method implemented using the contour outline of the contour of each cross-section, after passing through the center of each side of the contour is determined, the center point is connected to constitute axis, each connected to a contoured surface to achieve a three-dimensional inversion defects. Through a comparative analysis and study, the results demonstrated that contour reconstruction method is applicable to 4mm defects inversion.