| 引用本文: | 张晟,廖凯,车兴飞,钟利萍,龚海.铝合金材料非均匀表面应力的逐层构建与还原[J].材料科学与工艺,2019,27(6):12-18.DOI:10.11951/j.issn.1005-0299.20180205. |
| ZHANG Sheng,LIAO Kai,CHE Xingfei,ZHONG Liping,GONG Hai.Incremental construction and resuming of processing stresses on Al-based alloy component[J].Materials Science and Technology,2019,27(6):12-18.DOI:10.11951/j.issn.1005-0299.20180205. |
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| 摘要: |
| 铝合金板坯加工后表层应力呈现非均匀性,且强度高、深度浅.本文运用逐层钻孔应力释放-还原机理,通过积分法和逐层钻孔力学模型构建了材料表层加工应力-变形函数,在考虑材料各向异性条件下,用ANSYS仿真计算标定了5阶校准系数矩阵.同时,对加工表面进行逐层钻孔,孔径尺寸1.8 mm、深度20 μm,使孔周围应力释放,并测量释放后应变,最后将实验应变值代入函数求得表面应力分布.计算结果表明:在材料表层100 μm的深度范围,计算应力与仿真结果、XRD逐层测试结果均吻合较好,其中计算与实验结果偏差小于10 MPa,说明计算模型能较好地还原材料表层非均匀应力分布. |
| 关键词: 铝合金 逐层钻孔法 各向异性 积分法 应力测试 |
| DOI：10.11951/j.issn.1005-0299.20180205 |
| 分类号:TG146.2 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(51475483)；湖南省重点研发计划资助项目(2018NK2065)；湖南省高校科技创新团队支持计划项目(2014207). |
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| Incremental construction and resuming of processing stresses on Al-based alloy component |
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ZHANG Sheng1, LIAO Kai1, CHE Xingfei1, ZHONG Liping1, GONG Hai2
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(1.School of Mechanical and Electronic Engineering, Central South University of Forestry and Technology, Changsha 410004, China; 2.School of Mechanical and Electronic Engineering, Central South University, Changsha 410083, China)
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| Abstract: |
| The surface stress of Al-based alloy extrusion plate after being processed presents non-uniformity, and has high strength and distributes in shallow depth. In this paper, the principle of stress release-resuming via incremental hole-drilling method (IHDM) is used to construct the stress-deformation function of the subsurface of materials by the integral method and the incremental drilling mechanics model. Considering the anisotropy of the material, the 5th-order calibration coefficient matrix was calibrated by ANSYS calculation. Meanwhile, holes were drilled on the processing surface, where a hole of 1.8 mm diameter and 20 μm depth could help to release the stress around the hole. After the stress release, the strain could be measured. Finally, the experimental strain value was substituted into the function to obtain the surface stress profile. The calculation results show that the stress distribution was in good agreement with the results of the XRD test layer by layer in the subsurface of 100 μm depth. The average deviation between the experimental and the calculated stress was less than 10 MPa. The calculation model could well resume the inhomogeneous surface stress field of the material. |
| Key words: Al-based alloy incremental hole-drilling method anisotropy integral method stress measurement |
