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首页> 外文期刊>Engineering Fracture Mechanics >The beneficial effect of full or partial autofrettage on the combined 3-D stress intensity factors for inner radial crack arrays in a spherical pressure vessel
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The beneficial effect of full or partial autofrettage on the combined 3-D stress intensity factors for inner radial crack arrays in a spherical pressure vessel

机译：全部或部分自动压缩对球形压力容器内径向裂纹阵列组合的3-D应力强度因子的有益效果

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摘要

The distributions of the combined 3-D Stress Intensity Factor (SIF), K-IN = K-IP + K-IA, due to both internal pressure and autofrettage along the front of radial crack arrays emanating from the bore of an overstrained spherical pressure vessel are evaluated. The 3-D analysis is performed using the finite element (FE) method employing singular elements along the crack front. A novel realistic autofrettage residual stress field incorporating the Bauschinger effect is applied to the vessel. The residual stress field is simulated using an equivalent temperature field in the FE analysis. Numerous radial crack array configurations are analyzed. SIF distributions are evaluated for arrays of radial cracks containing one to twenty cracks, n = 1-20, of crack depth to wall thickness ratios of a/t = 0.01-0.8, and ellipticities (crack depth to crack length) of a/c = 0.2-1.0 prevailing in fully or partially autofrettaged spherical vessels of outer to inner radii R-0/R-i = 1.1, 1.2, and 1.7, bearing three levels of autofrettage (epsilon = 50%, 75%, and 100%). In total, about two hundred different crack configurations are analyzed. A detailed study of the influence of the above parameters on the prevailing SIF is conducted. The results clearly demonstrate the favorable effect of autofrettage which may considerably reduce the prevailing effective stress intensity factor, thus delaying crack initiation and slowing down crack growth rate, and hence, substantially prolonging the total fatigue life of the vessel. Furthermore, the results emphasize the importance of properly accounting for the Bauschinger effect including re-yielding, as well as the significance of the three dimensional analysis herein performed. (C) 2017 Elsevier Ltd. All rights reserved.
机译：组合的3-D应力强度因子（SIF），K-IN = K-IP + K-IA的分布由于沿着径向裂纹阵列的前部沿着受到过阵列的球形压力的孔发出的内部压力和自动分流船舶进行了评估。使用沿裂缝前沿采用奇异元素的有限元（Fe）方法进行3-D分析。将包含Bauschinger效应的新型现实自动分流应力场施加到容器上。使用Fe分析中的等效温度场模拟残余应力场。分析了许多径向裂缝阵列配置。评估SIF分布的径向裂缝阵列，含有一到20°裂缝，n = 1-20，裂缝深度与A / T = 0.01-0.8的壁厚比的裂纹深度，和A / C的椭圆形（裂缝深度） = 0.2-1.0在外部半径的完全或部分自体的球形容器中持续，内半径R-0 / Ri = 1.1,1.2和1.7，轴承三个水平的自动提样（Epsilon = 50％，75％和100％）。总共分析了大约两百个不同的裂缝配置。对上述参数对现行SIF的影响进行了详细研究。结果清楚地证明了自动提样的有利效果，这可能大大降低了普遍的有效应力强度因子，从而延迟了裂纹启动和减缓裂纹的生长速率，因此，基本上延长了容器的总疲劳寿命。此外，结果强调了适当核对Bauschinger效应，包括重新产生的疗效以及本文进行的三维分析的重要性。 （c）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Engineering Fracture Mechanics》 |2017年第2017期|共11页
  • 作者

    Perl M.; Steiner M.;

  • 作者单位

    Ben Gurion Univ Negev Dept Mech Engn Pearlstone Ctr Aeronaut Engn Studies IL-84105 Beer Sheva Israel;

    Ben Gurion Univ Negev Dept Mech Engn Pearlstone Ctr Aeronaut Engn Studies IL-84105 Beer Sheva Israel;

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  • 正文语种 eng
  • 中图分类 工程力学;
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