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首页> 外文会议>2002 ASME Pressure Vessels and Piping Conference, Aug 5-9, 2002, Vancouver, British Columbia, Canada >THE INFLUENCE OF FINITE THREE DIMENSIONAL MULTIPLE AXIAL EROSIONS ON THE FATIGUE LIFE OF PARTIALLY AUTOFRETTAGED PRESSURIZED CYLINDERS
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THE INFLUENCE OF FINITE THREE DIMENSIONAL MULTIPLE AXIAL EROSIONS ON THE FATIGUE LIFE OF PARTIALLY AUTOFRETTAGED PRESSURIZED CYLINDERS

机译：有限的三维多轴腐蚀对部分自动分选压力缸疲劳寿命的影响

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摘要

Erosion geometry effects on the mode I stress intensity factor (SIF) for a crack emanating from the farthest erosion's deepest point in a finitely or fully multiply eroded, partially autofrettaged, pressurized, thick-walled cylinder is investigated. The problem is solved via the FEM method. Autofrettage, based on von Mises yield criterion, is simulated by thermal loading and SIFs are determined by the nodal displacement method. SIFs were evaluated for a variety of relative crack depths, a/t = 0.01 - 0.30 and crack ellipticities, a/c = 0.5 - 1.5 emanating from the tip of the erosion of various geometries, namely, a) semi-circular erosions of relative depths of 1-10% of the cylinder's wall thickness, t; b) arc erosions for several dimensionless radii of curvature, r'/t = 0.05 - 0.3; and c) semi-elliptical erosions with ellipticities of d/h - 0.5-1.5. In the cases of finite erosions, the semi-erosion length to the semicrack length, L_e/C, was between 2 and 10, erosion angular spacing, α, was between 7 and 120 degrees, whereas autofrettage effects investigated were for 30%, 60% and 100% autofrettage. The normalized SIFs and the normalized effective SIFs of a crack emanating from the farthest finite erosion are found to rise sharply for values of L_e/c<3. Both the normalized SIF and normalized effective SIF values are mitigated as the amount of partial autofrettage increases with the most rapid decrease occurring between 0-60% autofrettage. The purpose of this study is to detail these findings.
机译：研究了腐蚀几何形状对从有限腐蚀或部分腐蚀，部分自解压，加压厚壁圆柱体中最远腐蚀最深点发出的裂纹的模式I应力强度因子（SIF）的影响。该问题通过FEM方法解决。通过热负荷模拟基于冯·米塞斯屈服准则的自紧力，并通过节点位移法确定SIF。对SIF进行了各种相对裂纹深度a / t = 0.01-0.30和裂纹椭圆率a / c = 0.5-1.5的评估，这些裂纹源自各种几何形状的腐蚀尖端，即a）相对裂纹的半圆形腐蚀深度为圆柱体壁厚的1-10％，t； b）几个无因次曲率半径的电弧腐蚀，r'/ t = 0.05-0.3； c）椭圆度为d / h-0.5-1.5的半椭圆腐蚀。在有限侵蚀的情况下，半侵蚀长度至半裂缝长度L_e / C在2至10之间，侵蚀角间距α在7至120度之间，而所研究的自动分断效应为30％，60 ％和100％自动增强。对于最远的有限腐蚀，发现裂纹的归一化SIF和归一化有效SIF对于L_e / c <3值急剧上升。随着部分自动强化的数量增加，归一化的SIF值和归一化的有效SIF值都得到缓解，其中最快速的降低发生在0-60％的自动强化之间。这项研究的目的是详细介绍这些发现。

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