| 复合固体推进剂裂尖复合型变形场和约束场分析 |
| |
| 引用本文： | 张亚,强洪夫.复合固体推进剂裂尖复合型变形场和约束场分析[J].上海航天,2011,28(1):37-39,45. |
| |
| 作者姓名： | 张亚 强洪夫 |
| |
| 作者单位： | 第二炮兵工程学院,陕西,西安,710025 |
| |
| 基金项目： | 国家教育部NECT和国家重大基础研究发展计划(61338) |
| |
| 摘 要： | 用有限元法分析了不同Ⅰ-Ⅱ复合型裂端的变形场和约束场（裂端形状改变能和应力三维度水平Rσ）分布。结果表明：复合型裂端变形为不对称的相反变形,符合钝化-锐化模型。Ⅰ-Ⅱ复合加载时裂纹尖端出现负约束区域（该区Rσ〈0）,当Ⅱ型分量增加,负约束区域增大,最大约束水平Rσmax降低,且绕裂纹尖端顺时针转动。Rσmax出现距裂纹尖端有一定距离处。Ⅰ-Ⅱ复合载荷下偏离原裂纹方向的裂纹在钝化区内某处危险点开始萌生,并与应力三维度最大位置处产生的空穴或孔洞聚合向前扩展。
|
| 关 键 词： | 复合固体推进剂 变形场 形状改变能 应力三维度 |
Finite Element Analysis on Deformation and Restraint Field of a Mixed Mode Crack in Composite Solid Propellant |
| |
| ZHANG Ya,QIANG Hong-fu.Finite Element Analysis on Deformation and Restraint Field of a Mixed Mode Crack in Composite Solid Propellant[J].Aerospace Shanghai,2011,28(1):37-39,45. |
| |
| Authors: | ZHANG Ya QIANG Hong-fu |
| |
| Institution: | ZHANG Ya,QIANG Hong-fu(The Second Artillery Engineering Academy,Xi'an Shaanxi 710025,China) |
| |
| Abstract: | Finite element method was employed to analyze differentⅠ-Ⅱ mixed-mode crack front deformation and restraint field（crack tip strain distortion energy and stress triaxial Rσ） in this paper,It＇s showed that an opposite kinds of deformation would occur at the crack tip of a mixed mode crack,and the deformation model of crack was sharpening-blunting.With an increasing of mode Ⅱ loading component,the negative region of restraint field（Rσ0） would exist at crack tip and become large,but the maximum restraint level（R（σ max）） was decreased,and moved around crack front clockwise.The R（σ max） was a little distance away from crack front,Crack under Ⅰ-Ⅱ mixed mode loading deflected its original direction would initiate in some dangerous place which was in the blunt region,then growth by coalesce with void or cavity created in the R_（σ max） region. |
| |
| Keywords: | Composite solid propellant Deformation field Strain distortion energy Stress triaxial |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
