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首页> 外文会议>International conference on fracture >Analysis of Creep Crack Growth in Surface Cracked Specimens:Comparisons between Approaches of Fracture Mechanics and Continuum Damage Mechanics
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Analysis of Creep Crack Growth in Surface Cracked Specimens:Comparisons between Approaches of Fracture Mechanics and Continuum Damage Mechanics

机译：表面裂纹试样蠕变裂纹扩展的分析：断裂力学方法与连续体损伤力学方法的比较

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摘要

The numerical approaches to simulate creep crack growth can be divided into two different categories. The first category is employing conventional fracture mechanics, in which the rate of crack growth is predicted by correlating it with a fracture mechanics parameter. The second category gaining much attention is on the basis of damage mechanics concept. In this paper, three dimensional analyses of creep crack growth are performed for 316 stainless steel specimens subjected to tension at high temperature with a semi-elliptical surface crack. Using two independent finite element analyses based on the fracture mechanics and continuum damage mechanics respectively, crack growth behaviors including crack profile development, crack size and propagation time are investigated and compared with each other and corresponding experimental data. The comparisons enable to show the different capabilities of the two approaches in predictions of creep crack growth.
机译：模拟蠕变裂纹扩展的数值方法可以分为两类。第一类采用常规断裂力学，其中通过将裂纹扩展速率与断裂力学参数相关联来预测裂纹扩展的速率。第二类引起广泛关注的是基于损伤力学的概念。在本文中，对316不锈钢试样在高温下具有半椭圆形表面裂纹的蠕变裂纹扩展进行了三维分析。通过分别基于断裂力学和连续损伤机理的两个独立的有限元分析，研究了裂纹扩展行为，包括裂纹轮廓发展，裂纹尺寸和传播时间，并与相应的实验数据进行了比较。比较可以显示两种方法在预测蠕变裂纹扩展方面的不同功能。

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