| 计算应力强度因子的无网格-直接位移法 |
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| 引用本文： | 梁尚清,黄其青,殷之平,陈建设.计算应力强度因子的无网格-直接位移法[J].机械强度,2006,28(3):383-386. |
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| 作者姓名： | 梁尚清 黄其青 殷之平 陈建设 |
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| 作者单位： | 西北工业大学,航空学院,西安,710072;西北工业大学,航空学院,西安,710072;西北工业大学,航空学院,西安,710072;西北工业大学,航空学院,西安,710072 |
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| 摘 要： | 目前计算裂纹尖端应力强度因子的无网格法一般均采用。积分方法，但由于该方法为间接求解，降低了求解精度与求解效率。文中采用无网格—伽辽金方法，选取带有扩展基的奇异基函数，以精确计算裂纹尖端位移场，并借鉴有限元法中计算应力强度因子的直接位移法，提出一种计算含裂结构裂纹尖端应力强度因子的新方法，即无网格—直接位移法。数值计算结果表明，该方法具有简捷、高效的特点，可以准确计算裂纹尖端应力强度因子。
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| 关 键 词： | 无网格法 移动最小二乘法 无网格-直接位移法 应力强度因子 奇异基 |
| 收稿时间： | 2004-08-03 |
| 修稿时间： | 2004-08-032004-09-09 |
MESHLESS-DIRECT DISPLACEMENT METHOD FOR CALCULATING THE STRESS INTENSITY FACTORS |
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| LIANG ShangQing,HUANG QiQing,YIN ZhiPing,CHEN JianShe.MESHLESS-DIRECT DISPLACEMENT METHOD FOR CALCULATING THE STRESS INTENSITY FACTORS[J].Journal of Mechanical Strength,2006,28(3):383-386. |
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| Authors: | LIANG ShangQing HUANG QiQing YIN ZhiPing CHEN JianShe |
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| Abstract: | Presently J internal method is generally used to calculate the stress intensity factors of the crack tips, but this method reduces the calculation's precision and efficiency for it is not a indirect way to get the SIFs(stress intensity factors). A new method named element free-direct displacement method is proposed to calculate the SIFs of crack tips. Enriched element-free Galerkin method with a singular basis was used to computer the displacement fields of crack tips and direct displacement method used in FEM(finite element method) was used to computer the SIFs. Numerical examples show that this method can calculate the SIFs conveniently, effectively and exactly. |
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| Keywords: | Element-free Galerkin method Moving least square method Element free-direct displacement method Stress intensity factors Singular basis |
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