| 引用本文: | 廖凯,张萧笛,车兴飞,陈辉,龚海.铝合金薄壁件加工变形的力学模型构建与分析[J].哈尔滨工业大学学报,2018,50(5):166.DOI:10.11918/j.issn.0367-6234.201709069 |
| LIAO Kai,ZHANG Xiaodi,CHE Xingfei,CHEN Hui,GONG Hai.Construction and analysis of mechanic model of deformation for Al alloy thin-walled component[J].Journal of Harbin Institute of Technology,2018,50(5):166.DOI:10.11918/j.issn.0367-6234.201709069 |
|
| 摘要: |
| 航空铝合金薄壁构件加工变形与应力场分布有着直接关联.本文结合构件加工后的应力场分布特征，建立薄壁构件的应力-变形力学模型，分析其表面应力和初始应力分布对变形影响的机制，确定应力分布特征与变形特征的对应关系，完成对薄壁件变形解析函数的建立和变形不确定度计算.具体表现为：通过喷砂表面处理对铣削加工后薄壁构件的表面应力进行调节，以获得不同程度的应力-变形场分布，再借助层削法、XRD表面应力测试和三坐标形状测量试验，对不同工艺条件下构件加工变形实验值与函数解析值进行比较分析.结果显示：薄壁构件变形挠度与理论计算值偏差为3~12 μm，偏差处于变形不确定度范围内，解析函数准确性得到验证.同时，力学模型与函数的分析表明，在已知此类航空铝合金薄壁构件几何形状、加工表面应力和毛坯初始应力场分布的条件下，可运用变形解析函数对构件加工变形程度进行预测性计算和分析，实现其工程应用价值.
|
| 关键词: 铝合金 加工变形 力学模型 变形函数 不确定度 |
| DOI：10.11918/j.issn.0367-6234.201709069 |
| 分类号:V262.3+3 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51475483)；湖南省高校科技创新团队支持计划项目(2014207)；中南林业科技大学青年科学研究基金重点项目(QJ2012011A) |
|
| Construction and analysis of mechanic model of deformation for Al alloy thin-walled component |
|
LIAO Kai1,ZHANG Xiaodi1,CHE Xingfei1,CHEN Hui1,GONG Hai2
|
|
(1. School of Mechanical and Electrical Engineering,Central South University of Forestry and Technology, Changsha 410004, China; 2. School of Mechanical and Electrical Engineering,Central South University, Changsha 410083, China)
|
| Abstract: |
| There are direct relations between machining deformation and stress field of aerospace Al-based alloy thin-walled component. With stresses profile characteristics of the component after milling processing, building a mechanical model of stress-deformation analyses that effect mechanism of stress on deformation and then get the corresponding relationship between the both of deformation and stress. The process is as follows: the different degree stress-deformation distributions of the thin-walled component after milling is obtained by shot-peening treatment, and then the experimental values of the deformation and the calculated values of analytic functions under different technological conditions are compared and analyzed using layer removed method, XRD stress and three-coordinate shape measurement technology. The experimental results show that the deformation deflection is 3~12 μm between the experimental value and the calculation, and the deviation is within the deformation uncertainty. By this work mentioned above, the deformation function can achieve the predictive calculation and analysis of the deformation degree under the premise of the geometrical shape, the surface stress and the initial stress of the component. The research satisfies the demand for engineering application.
|
| Key words: Al alloy processing deformation mechanical model deformation function uncertainty |
