Digital Material Surface Image Analysis for Evaluating Geometric Fatigue Crack Parameters

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
A. V. Byalonovych
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引用次数: 0

Abstract

A procedure for acquiring and analyzing digital fatigue crack propagation images is advanced, which provides automatic crack size detection and the deviation from the axis perpendicular to the loading direction. The procedure is based on comparing the original image with the subsequent ones and eliminating all elements present, only getting the changes in the fatigue crack extension. A slight shift of the images concerning each other was fixed with their cross-correlation. Choosing an optimum image segmentation level permits rejecting the elements that appear due to the digital matrix noise. The four-dimensional pixel assembly was used to get the geometric elements. As a result, a set of geometric figures characterizing the fatigue crack propagation was obtained. For analyzing the length and direction of crack components, the ellipses were applied whose second moments coincide with those of the components. The total change in the crack propagation direction and length is determined from the parameters of the vector connecting the centers of mass of the first and last components. The advanced procedure can be employed in crack resistance tests.

Abstract Image

用于评估几何疲劳裂纹参数的数字材料表面图像分析
本文提出了一种获取和分析数字疲劳裂纹扩展图像的程序,可自动检测裂纹尺寸以及与垂直于加载方向的轴线的偏差。该程序基于原始图像与后续图像的比较,并消除所有存在的元素,只获取疲劳裂纹扩展的变化。图像之间的轻微偏移是通过它们之间的交叉相关性固定的。选择最佳的图像分割级别,可以剔除因数字矩阵噪声而出现的元素。四维像素组合用于获取几何元素。因此,获得了一组表征疲劳裂纹扩展的几何图形。为了分析裂纹分量的长度和方向,应用了椭圆,其次矩与分量的次矩相吻合。裂纹扩展方向和长度的总变化是由连接第一个和最后一个分量质心的矢量参数确定的。这种先进的程序可用于抗裂试验。
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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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