Algorithm to 3-dimensional Analysis of Cleavage Facet and Its Application for Brittle Fracture Surface of Steels
Algorithm to 3-dimensional Analysis of Cleavage Facet and Its Application for Brittle Fracture Surface of Steels
复制标题
解理面三维分析算法及其在钢脆性断裂表面的应用
DOI：
10.2355/tetsutohagane1955.77.2_298
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
C. Masuda
中科院分区：
文献类型：
--
作者：
H. Sumiyoshi;T. Takano;C. Masuda
简介：将计算机图像处理技术应用于解理断裂面分析，并开发了一种用于估计 3 维解理面边界和 3 维面面积的算法。计算网格平面 Mi,1 和相邻网格平面 Mi+1,1 沿 X 轴的相对法向量之间的角度 ai ,j 并将 a 与阈值角度 ath 进行比较。如果一个。大于ath且ai+1.j小于ath，网格平面Mi+1，；被决定为面边界。沿 X 轴和 Y 轴继续进行相同的计算，以获得分析区域中包含的面数。估计小面边界后，将 2 维小面面积除以 cos lei, j（小面的平均法向量与垂直向量之间的角度）来计算 3 维小面面积。本研究开发的算法应用于分析低碳钢和HT80钢的解理断口，讨论了阈值角度对估计小面数量、a值分布和3维小面面积的影响。所开发的方法对于分析解理面尺寸以及讨论解理断裂与钢的微观结构（例如铁素体和原奥氏体晶粒尺寸）之间的关系非常有用。
Synopsis : Computer image processing technology was applied to cleavage fracture surface analysis and an algorithm for the estimation of 3-dimensional cleavage facet boundaries and 3-dimensional facet areas were developed. An angle ai ,j between relative normal vectors of a mesh plane Mi,1 and the adjacent mesh plane Mi+1,1 along X axis was calculated and a was compared to a threshold angle ath. If a. is larger than ath and ai+1.j is smaller than ath, the mesh plane Mi+ 1,; was decided to be the facet boundary. The same calculation was continued along both Xand Y-axes to obtain facet numbers contained in the analyzed area. After the estimation of facet boundaries, 3-dimensional facet areas were calculated from the 2-dimensional facet areas divided by cos lei, j, which is the angle between average normal vector of a facet and vertical vector. The algorithm developed in this study was applied to analyze the cleavage fracture surfaces of mild steel and HT80 steel and the effect of the threshold angle on the estimated facet numbers, distribution of the values of a and the 3-dimensional facet areas were discussed. The developed method is very useful for analyzing the cleavage facet size and for discussing a relationship between cleavage fracture and microstructures of steels, such as ferrite and the prior austenite grain sizes.