航空轴承套圈滚道表面涡流探伤技术研究

作者： 张凯胜   来源： 哈尔滨工业大学 年份： 2021 文献类型 ： 学位论文 关键词： 自动涡流检测   裂纹   带状碳化物   轴承套圈  

描述： 航空轴承套圈滚道表面涡流探伤技术研究

航空轴承套圈滚道表面涡流探伤技术研究

作者： 张凯胜   来源： 哈尔滨工业大学 年份： 2021 文献类型 ： 学位论文 关键词： 自动涡流检测   裂纹   带状碳化物   轴承套圈  

描述： 航空轴承套圈滚道表面涡流探伤技术研究

正交异性压电材料反平面裂纹问题研究

作者： 赵慧娟   来源： 太原科技大学 年份： 2019 文献类型 ： 学位论文 关键词： 机械能应变释放率   裂纹   正交异性压电材料   复合材料断裂复变方法  

描述： 正交异性压电材料反平面裂纹问题研究

正交异性压电材料反平面裂纹问题研究

作者： 赵慧娟   来源： 太原科技大学 年份： 2019 文献类型 ： 学位论文 关键词： 机械能应变释放率   裂纹   正交异性压电材料   复合材料断裂复变方法  

描述： 正交异性压电材料反平面裂纹问题研究

航空发动机零部件焊接过程仿真

作者： 唐心武   来源： 北京航空航天大学 年份： 2016 文献类型 ： 学位论文 关键词： 焊接   仿真  

描述： Welds are often an essential part of aero space engineering structures. Residual stresses introduced in the welded regions, due to the nonlinear thermal processes during welding, can have detrimental effects, such as stress corrosion cracking, hydrogen-induced cracking and reduced fatigue strength. It is therefore pertinent to simulate the process of welding to predict the behaviour of welded structures from finite element residual stress and deformation result. The base metal is Nickel based-supper alloy (INCONEL Alloy 718) of thin combustion chamber outer casing (CCOC). The simulations are performed with the commercial software SYSWELD+, which includes moving heat sources, material deposit, metallurgical properties, metal plasticity and elasticity, transient heat transfer and mechanical analyses. One-way thermo-mechanical coupling is assumed, which means that the thermal analysis is completed first, followed by a separate mechanical analysis based on the thermal history.This paper introduces finite element methods for the modeling of welds and it depicts a brief history of the simulation of welds. The processes, procedures, and metallurgy of gas-metal arc welding of nickel based alloy are presented in Chapter 2. In Chapter 3, the previous finite element analyses of welding are reviewed. The energy and constitutive equations governing a welding simulation are outlined in Chapter 4, while performing welding simulations utilizing the SYSWELD+ software is described in Chapter 5. The residual stress results for outer combustion casing are reported in Chapter6. The conclusion is described in chapter 7.Welding simulations to predict residual stress states require three-dimensional analysis in the vicinity of the joint and these analyses are computationally intensive and difficult. Although the state of the art in welding simulations using finite elements is improve as an advanced method.

航空发动机零部件焊接过程仿真

作者： 唐心武   来源： 北京航空航天大学 年份： 2016 文献类型 ： 学位论文 关键词： 焊接   仿真  

描述： Welds are often an essential part of aero space engineering structures. Residual stresses introduced in the welded regions, due to the nonlinear thermal processes during welding, can have detrimental effects, such as stress corrosion cracking, hydrogen-induced cracking and reduced fatigue strength. It is therefore pertinent to simulate the process of welding to predict the behaviour of welded structures from finite element residual stress and deformation result. The base metal is Nickel based-supper alloy (INCONEL Alloy 718) of thin combustion chamber outer casing (CCOC). The simulations are performed with the commercial software SYSWELD+, which includes moving heat sources, material deposit, metallurgical properties, metal plasticity and elasticity, transient heat transfer and mechanical analyses. One-way thermo-mechanical coupling is assumed, which means that the thermal analysis is completed first, followed by a separate mechanical analysis based on the thermal history.This paper introduces finite element methods for the modeling of welds and it depicts a brief history of the simulation of welds. The processes, procedures, and metallurgy of gas-metal arc welding of nickel based alloy are presented in Chapter 2. In Chapter 3, the previous finite element analyses of welding are reviewed. The energy and constitutive equations governing a welding simulation are outlined in Chapter 4, while performing welding simulations utilizing the SYSWELD+ software is described in Chapter 5. The residual stress results for outer combustion casing are reported in Chapter6. The conclusion is described in chapter 7.Welding simulations to predict residual stress states require three-dimensional analysis in the vicinity of the joint and these analyses are computationally intensive and difficult. Although the state of the art in welding simulations using finite elements is improve as an advanced method.

航空液压管路裂纹特性分析及故障诊断研究

作者： 张景博   来源： 辽宁科技大学 年份： 2022 文献类型 ： 学位论文 关键词： 特性分析   故障诊断   裂纹   航空液压管路   有限元法  

描述： 航空液压管路裂纹特性分析及故障诊断研究

航空液压管路裂纹特性分析及故障诊断研究

作者： 张景博   来源： 辽宁科技大学 年份： 2022 文献类型 ： 学位论文 关键词： 特性分析   故障诊断   裂纹   航空液压管路   有限元法  

描述： 航空液压管路裂纹特性分析及故障诊断研究

航空装备修理磁粉检测技术研究

作者： 孔宪平   来源： 西北工业大学 年份： 2016 文献类型 ： 学位论文 关键词： 航空装备修理   缺陷   航空工程   裂纹   磁粉检测   无损检测  

描述： 无损检测是我军航空装备修理的重要检测手段，对提高修理质量，保障飞行安全起着至关重要的作用。其中，磁粉检测是航空装备修理中应用最普遍的方法，是航空装备修理中质量控制主要的手段之一。 本文在分析多种常用无损检测技术，特别是磁粉检测技术的基础上，结

准晶材料平面断裂问题分析

作者： 袁彦鹏   来源： 郑州大学 年份： 2018 文献类型 ： 学位论文 关键词： 裂纹   界面   准晶   强度因子   广义不连续位移法   有限元法  

描述： 准晶材料平面断裂问题分析