| 姜 慧，刘 峰.基于有限元法的含裂纹平板应力强度因子研究[J].轻工机械,2015,33(2): |
| 基于有限元法的含裂纹平板应力强度因子研究 |
| Research of Stress Intensity Factor for Surface Crack in Plane Based on Finite Element |
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| DOI：IO. 3969/j. issn. 1005 -2895. 2015. 02. 022 |
| 中文关键词: 半椭圆裂纹 应力强度因子 有限元 节点奇异单元 |
| 英文关键词:semi elliptical crack stress intensity factor finite element node singular element |
| 基金项目: |
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| 中文摘要: |
| 许多结构和设备由于材料本身原因或使用不当会产生表面裂纹。应力强度因子是用来判定含裂纹的设备或结
构是否会失稳甚至断裂的重要依据。文中选用存在表面裂纹的有限大平板，用1/4节点奇异单元，建立含表面半椭圆裂
纹的平板有限元模型，利用ANSYS对此模型进行应力强度因子的求解。建立不同的模型进行对比分析，得出不同的裂
纹长度、深度、板厚等因素对裂纹尖端应力强度因子的影响情况，以及应力强度因子沿裂纹前缘分布规律。发现裂尖处
应力强度因子随着裂纹长度的增加而减小，随着裂纹深度的增加而增大；裂纹前缘的应力强度因子，在裂纹最深处最大，
由裂纹尖端向裂纹最深处呈现逐渐增大的变化规律。 |
| 英文摘要: |
| ln engineering practice, due to material's fault or some improper operations. a lot of structures and
equipments appear semi elliptical surface cracks. As the target of stress concentrate intensity and stress strain field.
stress intensity factor is an important basis in determining the safety. A finite plane with semi elliptical surface cracks
was chosen. An analytic plane model of finite element with semi elliptical surface cracks was established by the way of
1/4 node method singular element. The model was analyzed to get the solution of stress intensity factors by ANSYS.
Taking these elements into consideration. some different models were established and compared. The regularities of
distribution on edge line of stress intensity factor were concluded and the affections of elements on stress intensity factor
at crack tip were summarized. such as the length of cracks. the depth of cracks and the thickness of plane. In crack tip,
stress intensity factors decreased with the length growth of the crack. With the depth growthe of the crack. stress
intensity factors increased. Along the edge line. stress intensity factors increased from crack tip to the bottom of the
crack . |
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