表面裂纹板在拉伸或弯曲载荷作用下的约束和塑性区尺寸的变化

C. Aveline, S. Daniewicz
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引用次数: 3

摘要

采用商用有限元软件ANSYS对表面裂纹板进行弹塑性有限元分析。在拉伸和弯曲载荷下分析了各种裂纹的几何形状。提出了一种与表面裂纹周长位置相关的约束因子,类似于Newman定义的全局约束因子。这个新定义的约束系数是作用于一条线上的平均法向应力与流动应力比,这条线起源于并垂直于裂纹前缘的规定位置,并终止于裂纹平面上塑性区的周长。文中还给出了三维裂纹前沿塑性区形状和尺寸的有限元分析结果。分析表明,最大塑性区尺寸出现在自由表面以下(2°< Φ < 5°)。几何形状和施加的载荷参数在方程中考虑了它们与沿裂纹前沿约束的关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Variations of constraint and plastic zone size in surface-cracked plates under tension or bending loads
Elastic-plastic finite element analyses of surface-cracked plates are performed using the commercial finite element code ANSYS. Various crack geometries are analyzed under tension and bending loads. A constraint factor dependent on the location along the perimeter of the surface crack, similar to the global constraint factor defined by Newman, is presented. This newly defined constraint factor is the averaged normal stress to flow stress ratio acting on a line originating on and perpendicular to the crack front at a prescribed location and terminating at the perimeter of the plastic zone on the crack plane. The plastic zone shape and size around the three-dimensional crack front determined from the finite element analyses are also presented. The analyses indicate that the maximum plastic zone size occurs beneath the free surface (2° < Φ < 5°). Geometry and applied loading parameters are considered in equations relating them to constraint along the crack front.
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