| 引用本文: | 申志彬,张维星.预制缺陷柱壳结构的等效裂纹分析方法.[J].国防科技大学学报,2014,36(5):155-161.[点击复制] |
| SHEN Zhibin,ZHANG Weixing.Equivalent crack analysis method of the cylindrical shell with prefabricated defects[J].Journal of National University of Defense Technology,2014,36(5):155-161[点击复制] |
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| 预制缺陷柱壳结构的等效裂纹分析方法 |
| 申志彬, 张维星 |
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(国防科技大学 航天科学与工程学院，湖南 长沙 410073)
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| 摘要: |
| 针对传统有限元法在分析预制缺陷柱壳时出现的应力/应变计算精度不足、无法有效指导工程实践的问题，提出了一种具有高冗余度的等效裂纹分析方法。将预制缺陷视作典型裂纹，基于奇异裂纹元法对其进行裂纹稳定性分析，并根据稳定性分析结果来评估预制缺陷柱壳的结构完整性。通过该方法得到的分析结果具有比常规有限元分析更高的可靠性，对于导弹线式爆炸分离装置等工作环境恶劣、风险系数较高的预制缺陷柱壳结构而言，该方法有助于提升其设计的安全裕度，具有一定的工程实用性。 |
| 关键词: 预制缺陷 奇异裂纹元 线式爆炸分离装置 结构完整性 等效裂纹分析 |
| DOI：10.11887/j.cn.201405026 |
| 投稿日期：2014-03-25 |
| 基金项目:国家自然科学基金重点资助项目(11132012)；国防科学技术大学科研计划资助项目(JC13-01-03) |
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| Equivalent crack analysis method of the cylindrical shell with prefabricated defects |
| SHEN Zhibin, ZHANG Weixing |
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(College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| Focusing on the problem that the traditional finite element analysis results of the cylindrical shell with prefabricated defects couldn't be applied on the engineering practice effectively due to the low computing precision of stress and strain, an equivalent crack analysis method with high redundancy was proposed. Treat the prefabricated defects as typical crack, and analyze the crack stability with the singular crack element method, then assess the structural integrity of the cylindrical shell with prefabricated defects according to the analytical results of the crack stability. The analysis result obtained through this new method is more reliable than the traditional finite element method, and it is practical in promoting the safety margin of the engineering design, especially for the prefabricated defects of cylindrical shell structure working in severe environment with high risk coefficient like linear explosive separation device of the missile. |
| Keywords: prefabricated defects singular crack element linear explosive separation device structural integrity equivalent crack analysis |
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