| 摘要: |
| 摩擦液柱成形(FHPP)是摩擦叠焊的基本单元成形过程,也是影响摩擦叠焊焊接质量的关键环节。采用有限元软件MSC Marc建立了FHPP过程初期阶段的三维有限元热力耦合模型,对同质材料Q235-Q235组合进行了计算。结果表明,在焊接过程中焊棒底端摩擦面上的温度呈现沿径向由内向外逐渐升高的趋势,而接触压力的分布则是逐渐渐小。在材料未发生明显塑性变形的状态下提高转速对温度的升高作用显著,但是温度越高,效果越不明显。当材料在高温状态下发生塑性变形时,采用增大轴向力的方式更有利于温度的升高和材料大变形的产生。 |
| 关键词: 摩擦液柱成形 摩擦叠焊 有限元法 热力耦合分析 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(50675022);国家863高技术研究发展计划资助项目(2006AA09Z329);北京市自然科学基金资助项目(3073017) |
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| Thermal mechanical coupling analysis on initial period of FHPP in friction stitch welding |
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ZHANG Baosheng, JIAO Xiangdong, CHEN Jiaqing, ZHOU Canfeng
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Research Center of Offshore Engineering Joining Technology, Beijing Institute of Petrochemical Technology, Beijing 102617, China
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| Abstract: |
| The fundamental forming process of friction stitch welding is friction hydro pillar processing, which is the key process that effects the quality of Friction Stitch Welding.A three-dimensional thermal mechanical coupling model of FHPP process was established by using finite element code MSC.Marc.The calculated results with material coupling of Q235-Q235 indicate that the temperature distribution on the friction surface has a tendency to rise gradually from the inside to outside on radial direction during welding process, while the contact pressure distribution decreases gradually. With the increase of rotary speed, the temperature is remarkably increased while the material doesn't illustrate obvious plastic deformation, but the effect is relatively weak with the increase of temperature.When material in the contact zone illustrates plastic strain at high temperatures, increasing axial force is more effective for increasing temperature and inducing large deformation. |
| Key words: friction hydro pillar processing friction stitch welding finite element method thermal-mechanically coupled analysis |
