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搅拌头倾角对铝合金FSW过程传热传质的影响
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作者 翟明 武传松 +1 位作者 石磊 宋宏图 《航天制造技术》 2023年第4期23-29,共7页
铝合金等轻质合金由于具有较低的密度与较高的强度,在交通运载器具制造领域得到越来越广泛的应用。搅拌摩擦焊(FSW),作为低热输入的固相连接工艺,是其重要的成形工艺。其中,搅拌头倾角作为保障焊缝成型的重要参量,其对焊接过程的影响还... 铝合金等轻质合金由于具有较低的密度与较高的强度,在交通运载器具制造领域得到越来越广泛的应用。搅拌摩擦焊(FSW),作为低热输入的固相连接工艺,是其重要的成形工艺。其中,搅拌头倾角作为保障焊缝成型的重要参量,其对焊接过程的影响还缺乏认识。因此,本研究通过数值模拟的方式,在1.5°、2.5°与4°三组搅拌头倾角条件下,定量分析倾角对焊接过程传热传质的影响规律。在模型中考虑由倾角引起的不完全接触区域及其偏转,并采用非均匀轴向应力、滑移率和摩擦系数。发现当倾角从1.5°增加到4°时,搅拌头后方材料流动能力增强,材料向前进侧迁移的能力提升;界面热流密度增大,剪切层内粘性耗散产热率增大,焊接温度升高。 展开更多
关键词 搅拌摩擦焊 搅拌头倾角 产热传热 材料流动 数值分析
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Analytical solutions of transient heat conduction in multilayered slabs and application to thermal analysis of landfills 被引量:6
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作者 WU Xun SHI Jian-yong +2 位作者 LEI Hao LI Yu-ping Leslie OKINE 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第11期3175-3187,共13页
The study of transient heat conduction in multilayered slabs is widely used in various engineering fields. In this paper, the transient heat conduction in multilayered slabs with general boundary conditions and arbitr... The study of transient heat conduction in multilayered slabs is widely used in various engineering fields. In this paper, the transient heat conduction in multilayered slabs with general boundary conditions and arbitrary heat generations is analysed. The boundary conditions are general and include various combinations of Dirichlet, Neumann or Robin boundary conditions at either surface. Moreover, arbitrary heat generations in the slabs are taken into account. The solutions are derived by basic methods, including the superposition method, separation variable method and orthogonal expansion method. The simplified double-layered analytical solution is validated by a numerical method and applied to predicting the temporal and spatial distribution of the temperature inside a landfill. It indicates the ability of the proposed analytical solutions for solving the wide range of applied transient heat conduction problems. 展开更多
关键词 heat conduction multilayered slab heat generation analytical solutions LANDFILL
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