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论文:2015,Vol:33,Issue(6):928-935 |
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引用本文： |
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高文, 王生楠. T应力对线弹性材料脆性断裂的影响[J]. 西北工业大学学报 |
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Gao Wen, Wang Shengnan. Effect of T-Stress on the Brittle Fracture for Linear Elastic Materials[J]. Northwestern polytechnical university |
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| T应力对线弹性材料脆性断裂的影响 |
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| 高文, 王生楠 |
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| 西北工业大学 航空学院, 陕西 西安 710072 |
| 摘要: |
| 在考虑裂纹尖端应力场常数项T应力的基础上对传统的最小应变能密度因子准则(minimum strain energy density criterion,SED)进行修正,应用修正的最小应变能因子准则对Ⅰ型、Ⅱ型和Ⅰ-Ⅱ复合型脆性断裂问题分别进行研究,分析T应力对裂纹扩展方向和断裂时刻应力强度因子的影响并给出不同T应力条件下的通用的Ⅰ型、Ⅱ型和Ⅰ-Ⅱ复合型裂纹扩展条件,并将预测结果与现有的试验数据进行比较。分析表明,T应力对于Ⅰ型、Ⅱ型和Ⅰ-Ⅱ复合型断裂均有显著影响,考虑T应力的SED预测结果和试验结果吻合很好。 |
| 关键词:
T应力
最小应变能密度因子准则
脆性断裂
应力强度因子
裂纹扩展角
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| Effect of T-Stress on the Brittle Fracture for Linear Elastic Materials |
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| Gao Wen, Wang Shengnan |
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| College of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China |
| Abstract: |
| The conventional minimum strain energy density (SED) criterion is modified by taking into account the effect of nonsingular stress term (T-stress) in addition to the singular stress term. Then we use the modified SED criterion to study the effect of T-stress on the fracture initiation angle and the critical intensity factors of brittle materials under mode Ⅰ, mode Ⅱ and mixed Ⅰ-Ⅱ mook loading conditions. The general conditions for forecasting mode Ⅰ, mode Ⅱ and mixed Ⅰ-Ⅱ mode fracture under various T-stress are provided. The forecast results are compared with some earlier experimental results. The analysis shows that the presence of T-stress has a significant effect on mode Ⅰ, mode Ⅱ and Ⅰ-Ⅱ mixed mode fracture in brittle fracture of linear elastic materials; there is a good agreement between experimental results and results forecast with the modified SED criterion. |
| Key words:
T-stress
minimum strain energy density criterion
brittle fracture
stress intensity factors
fracture initiation angle
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| 收稿日期: 2015-04-23
修回日期:
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| DOI: |
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Email： |
| 作者简介: 高文(1988—),西北工业大学博士研究生,主要从事结构疲劳、断裂、可靠性研究。
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