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首页> 外文期刊>Journal of Pressure Vessel Technology >The Influence of the Bauschinger Effect on 3D Stress Intensity Factors for Internal Radial Cracks in a Fully or Partially Autofrettaged Gun Barrel
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The Influence of the Bauschinger Effect on 3D Stress Intensity Factors for Internal Radial Cracks in a Fully or Partially Autofrettaged Gun Barrel

机译：鲍辛格效应对完全或部分自动装填枪管内部径向裂纹的3D应力强度因子的影响

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摘要

The influence of the Bauschinger effect (BE) on the three-dimensional, mode I, stress intensity factor (SIF) distributions for arrays of radial, internal, surface cracks emanating from the bore of a fully or partially autofrettaged thick-walled cylinder is investigated. A thorough comparison between the prevailing SIFs for a "realistic" (Bauschinger effect dependent autofrettage (BEDA)) and those for an "ideal" (Bauschinger effect independent autofrettage (BEIA)) is done. The three-dimensional (3D) analysis is performed via the finite element method and the submodeling technique, employing singular elements along the crack front. Both autofrettage residual stress fields, BEDA and BEIA, are simulated using an equivalent temperature field. More than 300 different crack configurations are analyzed. SIFs for numerous crack arrays (n=1-64 cracks), a wide range of crack depth to wall thickness ratios (a/t=0.01-0.2), various ellipticities (a/c=0.5-1.5), and different levels of autofrettage (?=30-100%) are evaluated. The Bauschinger Effect is found to considerably lower the beneficial stress intensity factor due to autofrettage, K{sub}(IA), by up to 56%, as compared to the case of ideal autofrettage. The reduction in K{sub}(IA) varies along the crack front with a maximum at the point of intersection between the crack plane and the inner surface of the cylinder, decreasing monotonically toward the deepest point of the crack. The detrimental influence of the BE increases as the number of cracks in the array increases and as crack depth decreases. For a partially autofrettaged cylinder, as the level of overstrain becomes smaller the influence of the BE is considerably reduced. As a result, the SIFs due to 100% BEDA differ by <10% as compared to 60% BEDA, and on the average the difference is only about 2-4%.
机译：研究了鲍辛格效应（BE）对三维模型I应力强度因子（SIF）分布的影响，该模型是从完全或部分自动加筋的厚壁圆柱孔产生的径向，内部，表面裂纹阵列的。对“现实的”（依赖Bauschinger效应的自动玻璃钢（BEDA））和“理想的”（“ Bauschinger效应独立的自动玻璃钢”（BEIA））的主流SIF进行了全面比较。通过有限元方法和子建模技术执行三维（3D）分析，沿裂纹前沿采用奇异元素。使用等效温度场模拟了自动补强残余应力场BEDA和BEIA。分析了300多种不同的裂纹形态。 SIF适用于众多裂纹阵列（n = 1-64个裂纹），宽范围的裂纹深度与壁厚之比（a / t = 0.01-0.2），各种椭圆率（a / c = 0.5-1.5）以及不同的评估了自动补强（？= 30-100％）。与理想的自动玻璃钢的情况相比，发现鲍辛格效应大大降低了由于自动玻璃钢K {sub}（IA）引起的有益应力强度因子高达56％。 K {sub}（IA）的减小沿裂纹前沿变化，在裂纹平面与圆柱体内表面之间的交点处最大，朝裂纹的最深点单调减小。随着阵列中裂纹数量的增加和裂纹深度的减小，BE的有害影响也随之增加。对于部分自动装瓶的气缸，随着超应变水平变小，BE的影响会大大降低。结果，与60％BEDA相比，归因于100％BEDA的SIF相差<10％，平均差异仅约2-4％。

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