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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference: High-Pressure Technology 2003: Shaping High Pressure Technology for the Future; 20030720-20030724; Cleveland,OH; US >STRESS INTENSITY FACTORS FOR A CURVED-FRONT INTERNAL CRACK IN AN AUTOFRETTAGED TUBE WITH BAUSCHINGER EFFECT
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STRESS INTENSITY FACTORS FOR A CURVED-FRONT INTERNAL CRACK IN AN AUTOFRETTAGED TUBE WITH BAUSCHINGER EFFECT

机译：鲍辛格效应的自粘性管弯曲前部内部裂纹的应力强度因子

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摘要

Pressure vessel steels exhibit the Bauschinger effect that significantly reduces post-autofrettage residual compressive hoop stresses in the near-bore region in comparison with 'ideal' (elastic-perfectly plastic) behavior. These reduced hoop stress profiles were calculated using Von Mises' criterion via a non-linear analysis for the case of open-end (engineering plane strain) autofrettage. These profiles were then used to obtain stress intensity factor solutions via the Boundary Integral Equation (BIE) method, commonly known as the Boundary Element Method (BEM). Results are presented for tubes of diameter ratio 2 and 2.5 with an internal semi-elliptical surface crack having a maximum depth/surface length ratio of 0.4 (i.e. an eccentricity of 0.8). Crack depths range from 20% to 80% of wall thickness and results are presented for seven locations on the crack front from maximum depth to free surface. For crack depths up to 20% of wall thickness there is a significant reduction in magnitude of autofrettage stress intensity factor due to Bauschinger effect. For typical overstrain levels this reduction is approximately 30% of 'ideal' values. Such a reduction may, in turn, cause an order of magnitude reduction in the fatigue lifetime of the vessel.
机译：与“理想”（弹性完美塑性）行为相比，压力容器钢具有鲍辛格效应，该效应可显着降低近孔区域的自强化后残余压缩环向应力。这些减小的环向应力分布是使用冯·米塞斯（Von Mises）的准则通过针对开放端（工程平面应变）自动强化情况的非线性分析来计算的。然后，这些轮廓用于通过边界积分方程（BIE）方法（通常称为边界元素方法（BEM））获得应力强度因子解。给出了直径比为2和2.5的管的内部半椭圆形表面裂纹的最大深度/表面长度比为0.4（即，偏心率为0.8）的结果。裂纹深度为壁厚的20％至80％，并给出了裂纹前沿从最大深度到自由表面的七个位置的结果。对于裂纹深度不超过壁厚20％的情况，由于鲍辛格效应，自增强应力强度因子的幅度将大大降低。对于典型的超应变水平，这种降低约为“理想”值的30％。这种减少又可能导致容器疲劳寿命减少一个数量级。

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