2021 Fiscal Year Annual Research Report
Dynamic thermo-mechanical phenomenon and multi-scale strengthening mechanism during friction stir weld-riveting process
| Project/Area Number |
21K14439
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| Research Institution | Osaka University |
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Principal Investigator |
馬 運五 大阪大学, 接合科学研究所, 特任助教(常勤) (00870601)
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| Project Period (FY) |
2021-04-01 – 2022-03-31
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| Keywords | Friction stir / Riveting / Aluminum alloy / Solid-state joining / Multi-scale enhance / Miniature tensile test |
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| Outline of Annual Research Achievements |
An integrated one-step friction stir weld-riveting (FSWR) process combining friction stir spot welding (FSSW) and self-piercing riveting (SPR) is proposed to join 7 series aluminum alloys. Using inprocess friction heating and high-speed rivet stirring to ①prevent crack defect, achieve ②fine grain strengthening via dynamic recrystallization, and form a hybrid joint with ③solid-state bonding and
④mechanical interlock. This research elucidates the control mechanisms of friction heat and rivet stirring on the above four key features. In addition, multi-scale strength evaluation models and miniature tensile tests were performed to clarify the hybrid strengthening mechanisms of the four key features on the overall mechanical performance of the FSWR joints.
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Research Products
(13 results)
