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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference vol.3: Design and Analysis; 20050717-21; Denver,CO(US) >INFLUENCE OF THE INTERACTION ON STRESS INTENSITY FACTOR OF SEMI-ELLIPTICAL SURFACE CRACKS
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INFLUENCE OF THE INTERACTION ON STRESS INTENSITY FACTOR OF SEMI-ELLIPTICAL SURFACE CRACKS

机译：相互作用对半椭圆形表面裂纹应力强度因子的影响

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摘要

The interaction between multiple surface cracks is an important consideration in the cracking behavior due to thermal fatigue and stress corrosion cracking. However, it is difficult to evaluate the intensity of the interaction quantitatively because there are many factors such as the relative position, size and geometry of the cracks. Furthermore, the influence of the interaction differs with the crack tip position along the front. In this study, in order to investigate the intensity of interaction, the stress intensity factor (SIF) of interacting semi-elliptical surface cracks was evaluated by the finite element method and finite element alternating method. These methods enable us to evaluate the SIF of interacting cracks for various conditions. The analysis results reveal that the change in the averaged SIF along the crack front caused by coalescence of two cracks can be estimated from the change in the area size. The maximum interaction can be estimated by simple addition of the area size of two cracks regardless of the loading condition and relative crack size. To exclude the conservativeness caused by the current combination rule, new criteria are shown.
机译：由于热疲劳和应力腐蚀开裂，多个表面开裂之间的相互作用是开裂行为中的重要考虑因素。但是，由于存在许多因素，例如裂纹的相对位置，大小和几何形状，因此很难定量地评估相互作用的强度。此外，相互作用的影响随沿裂纹尖端的位置而不同。在这项研究中，为了研究相互作用的强度，通过有限元法和有限元交替法对相互作用的半椭圆形表面裂纹的应力强度因子（SIF）进行了评估。这些方法使我们能够评估各种条件下相互作用的裂纹的SIF。分析结果表明，由两个裂纹的合并引起的沿裂纹前沿的平均SIF的变化可以通过面积变化来估计。可以通过简单地添加两个裂缝的面积大小来估算最大相互作用，而与加载条件和相对裂缝大小无关。为了排除由当前组合规则引起的保守性，将显示新标准。

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