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- 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.
- 航空面齿轮热滚轧表层残余应力分析
- 作者： 靳园园 徐红玉 李莉 张丰收 王晓强 张广 来源： 塑性工程学报 年份： 2022 文献类型 ： 期刊 关键词： 航空面齿轮 残余应力 有限元仿真 热滚轧
- 描述： 为获得热滚轧成形参数对面齿轮表面残余应力的性质、大小以及分布的影响规律，根据航空面齿轮热滚轧成形加工实况，应用Deform-3D软件建立了面齿轮热滚轧有限元仿真模型，分析了不同成形参数下面齿轮表面
- 飞机受损件打磨表面形状对激光喷丸残余应力的影响
- 作者： 徐晓 帅高鹏 程秀全 夏琴香 来源： 华南理工大学学报(自然科学版) 年份： 2018 文献类型 ： 期刊 关键词： 激光喷丸 曲面曲率 表面形状 残余应力
- 描述： 为研究飞机受损件经打磨后表面形状对残余应力分布的影响,文中对飞机受损件腐蚀损伤区域打磨后的表面形状进行分类,并对表面形状进行函数表征,采用ABAQUS软件完成了不同表面形状及曲面曲率下激光喷丸
- 基于变形最小化的航空框类整体件加工策略分析
- 作者： 丁桂楚 张涛 李宏伟 江金锴 黄晓明 来源： 滨州学院学报 年份： 2019 文献类型 ： 期刊 关键词： 加工变形 有限元 加工策略 残余应力
- 描述： 为揭示不同加工工序对航空框类整体结构件加工变形的影响,基于有限元建立初始残余应力引起框类整体结构件加工变形的预测模型,根据毛坯初始应力引起框类零件的加工变形规律,基于航空框类整体结构件变形最小化
- 激光温喷丸强化航空轻质合金的振动模态及疲劳延寿机理
- 作者： 孟宪凯 周建忠 来源： 机械工程学报 年份： 2019 文献类型 ： 期刊 关键词： 振动疲劳 轻质合金 动态析出 残余应力
- 描述： WLP的振动疲劳延寿机制。主要内容有:(1)残余压应力的生成及释放机制:分析了WLP诱导的残余应力分布规律,推导了WLP诱导残余压应力峰值及塑性变形深度的理论分析模型。研究了WLP过程中的应力应变本构模型,建立了残余应力场的数值分析方法;分析了残余压应力
- 基于变形最小化的航空框类整体件加工策略分析
- 作者： 丁桂楚 张涛 李宏伟 江金锴 黄晓明 来源： 滨州学院学报 年份： 2019 文献类型 ： 期刊 关键词： 加工变形 有限元 加工策略 残余应力
- 描述： 为揭示不同加工工序对航空框类整体结构件加工变形的影响,基于有限元建立初始残余应力引起框类整体结构件加工变形的预测模型,根据毛坯初始应力引起框类零件的加工变形规律,基于航空框类整体结构件变形最小化
- 航空薄壁弧形结构件喷丸强化变形预测
- 作者： 曾维逵 谢腾飞 蒋建军 钞欣 李映辉 杨杰 来源： 力学季刊 年份： 2019 文献类型 ： 期刊 关键词： 变形 喷丸强化 残余应力 薄壁弧形件
- 描述： 喷丸强化是一种有效提高工件抗疲劳性能的表面处理工艺,经喷丸强化处理后的航空薄壁弧形结构件发生变形是航空制造领域的共性难题.本文基于变截面曲梁平面弯曲理论,建立了弧形件喷丸诱导应力与变形方程,将得到的构件最大变形与有限元方法计算结果进行对比,所建立理论模型能有效预测弧形件喷丸强化后的变形.讨论了喷丸压力和喷丸区域对喷丸变形的影响,结果表明:喷丸强化工艺仅作用于弧形件腹板表面时,弧形件变形以径向收缩为主;喷丸强化工艺仅作用于弧形件筋板表面时,弧形件变形以径向扩张为主;与局部喷丸相比,对弧形件所有表面喷丸强化时,弧形件弯曲变形减小,轴向伸长增大.