LS-DYNA双层金属机匣包容准则研究
关键词：航空发动机 包容性 双层金属机匣 机匣间距 机匣侵彻
毕业论文设计说明书外文摘要
Title Study on the inclusion criteria of the metal casing with double layer
Abstract
The aviation engine casing inclusive is one of the important indexes of engine reliability and safety. Aircraft engine casing the inside of the casing of the high pressure compressor and turbine box is double deck machine box body, the graduation design the main research is the study of double layer metal casing inclusive, through the process of penetration casing blade, study inclusive of double-layer casing, provide guidance for aircraft engine design and safety. In this paper, the inclusion of casing at the beginning of the level of research, simulation studies the problem of double casing inclusive. Using the finite element software ANSYS, the LS-DYNA numerical simulation, studied one of the main factors that affect for the inclusive layer spacing. By studying the experimental data of blade speed, concluded that the double metal casing inclusive than single metal casing. Spacing of casing is an important factor in an inclusive, with the increase of layer spacing, inclusive of casing change trend is increase, decrease, increased, finally tended to a constant state.
Keywords Aircraft engine Inclusive Double layer Casing space Casing penetration
目 次
1 绪论 1
1.1 研究背景 1
1.2 国内外研究现状 1
1.3 包容性研究的目的和意义 3
2 软件和基础知识 5
2.1 包容性的定义 5
2.2 失效部件的统计 5
2.3 包容性的描述方法 7
2.4 关于侵彻的定义 7
2.5 ANSYSLS-DYNA软件和在侵彻方面的应用 8
2.6 影响金属机匣的包容性的因素 9
3 模拟打靶实验与结果 10
3.1建立有限元模型 10
3.2材料参数的选定 11
3.3 数据的后处理 12
3.4 后处理的结果 12
3.5 分析与总结 16
结论 17
致谢 18
参考文献 19
1 绪论
1.1 研究背景
现代喷气航空发动机叶片长期在恶劣的工作环境下工作，叶片在工作时会产生碎片。一旦在工作时产生碎片或者脱落，高速时会有巨大的能量产生。此时，机匣的包容性显得尤为重要，如果机匣的包容型不够优秀，高速的叶片会击穿飞机的其他零部件，对飞机安全产生影响。如果飞机在地面，会对附近的人和物的安全造成影响。上世纪80年代美国的大黄蜂战斗机曾经发生坠毁事故，就是因为所使用的涡轮发动机中的涡轮盘发生破裂，高速的碎片击穿了发动机机匣，从而破坏了飞机的运行，造成了机毁人亡的惨剧。