| 固体推进剂复合型裂纹扩展数值计算 |
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| 引用本文： | 职世君,孙冰,张建伟.固体推进剂复合型裂纹扩展数值计算[J].固体火箭技术,2011,34(1):28-31,47. |
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| 作者姓名： | 职世君 孙冰 张建伟 |
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| 作者单位： | 北京航空航天大学,宇航学院,北京,100191 |
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| 摘 要： | 用粘弹性有限元法,分别以尖角形、椭圆形、圆形裂尖反映裂尖的变形,以最大周向应力准则和最大能量释放率准则作为裂纹扩展方向的判断依据,以J积分作为裂纹扩展的起始判据,计算了不同倾斜角裂纹的初始扩展方向.采用多个扩展步递增循环计算的方法,得到了不同倾斜角裂纹的扩展路径,并在扩展路径上设置粘结损伤单元,模拟了裂纹的动态扩展过程...
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| 关 键 词： | 固体推进剂 裂纹扩展 粘结损伤 粘弹性 有限元法 |
Numerical computation of mixed mode crack propagation in solid propellant |
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| ZHI Shi-jun,SUN Bing,ZHANG Jian-wei.Numerical computation of mixed mode crack propagation in solid propellant[J].Journal of Solid Rocket Technology,2011,34(1):28-31,47. |
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| Authors: | ZHI Shi-jun SUN Bing ZHANG Jian-wei |
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| Institution: | ZHI Shi-jun,SUN Bing,ZHANG Jian-wei(School of Astronautics,Beijing University of Aeronautics and Astronautics,Beijing 100191,China) |
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| Abstract: | The viscoelastic finite element method was adopted and the effect of crack tip's deformation is taken into account by various crack tip shapes: sharp angle,ellipse or circular.Maximum tangential stress criterion and the maximum energy release rate criterion were used to estimate the initial crack propagation angle,and J integral criterion was introduced to estimate the initiation of crack propagation.Propagation paths of different cracks were calculated by multiple expanded steps calculation method.Then the... |
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| Keywords: | solid propellant crack propagation cohesive damage viscoelastic finite element method |
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