| 受剪切应力作用的表面裂纹应力强度因子研究 |
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| 引用本文： | 谢伟,黄其青,Masanori Kikuchi. 受剪切应力作用的表面裂纹应力强度因子研究[J]. 机械科学与技术, 2010, 0(3) |
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| 作者姓名： | 谢伟 黄其青 Masanori Kikuchi |
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| 作者单位： | 西北工业大学航空学院;东京理科大学机械工程学院; |
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| 摘 要： | 应用改进的三维虚拟裂纹闭合方法研究了受远端剪切应力作用的有限大体半椭圆表面裂纹复合型应力强度因子分布,并讨论了整个裂纹前缘复合型应力强度因子分布随裂纹形状变化和结构参数变化的规律。研究发现在自由表面附近,Ⅲ型应力强度因子分布受角点应力奇异性影响较大,在自由表面附近出现转折,但转折现象与裂纹形状参数有关,当裂纹形状比a/c≤0.6时,应力强度因子分布曲线光滑,表现为经典的角点奇异性。
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| 关 键 词： | 改进的虚拟裂纹闭合方法 应力强度因子 复合型 表面裂纹 |
A Study of the Stress Intensity Factor of Surface Crack under Remote Shear |
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| Xie Wei,Huang Qiqing,Masanori Kikuchi. A Study of the Stress Intensity Factor of Surface Crack under Remote Shear[J]. Mechanical Science and Technology for Aerospace Engineering, 2010, 0(3) |
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| Authors: | Xie Wei Huang Qiqing Masanori Kikuchi |
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| Affiliation: | Xie Wei1,Huang Qiqing1,Masanori Kikuchi2 |
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| Abstract: | The modified virtual crack closure method(MVCCM) was used to study the mixed mode stress intensity factors of semi-elliptical surface crack in finite body under remote shear stressing.Distributions of stress intensity factors along the crack front were indicated in figures as functions of the elliptical shape and structure shape.We can conclude that the mode Ⅲ stress intensity factor distribution is strongly affected by a corner singularity in stresses which differs from the conventional inverse square root singularity at interior points along the crack front.But when the elliptical shape a/c is less than or equal to 0.6,the mode Ⅲ factor goes smoothly,and it presents the conventional inverse square root singularity. |
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| Keywords: | modified virtual crack closure method(MVCCM) stress intensity factor(SIF) mixed mode surface crack |
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