圓杯型摩擦攪拌點銲支應力強度因子分析
| Autor: | Po-Hsiang Huang, 黃柏翔 |
|---|---|
| Jazyk: | zh-TW |
| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 In this paper, the stress intensity factor (SIF) solutions of friction stir spot welds (FSSWs) in circular-cup specimens were studied by theoretical and numerical approaches. The upper sheets of FSSWs have step structures with various geometries; therefore, the analytical SIF solutions for resistance spot welds cannot be used. The structural stress solutions of FSSWs under opening loading conditions were first obtained by the two-step model of Chung and Wang. According to the plate theory and section method, the modified structural stress solutions were proposed. The two SIF solutions for FSSWs were then obtained from the two structural stress solutions and Zhang’s SIF solutions for spot welds with unequal thicknesses. Based on the 3D finite element model of the FSSW circular-cup specimen from胡力方’s work, the numerical SIF solutions were obtained as well. Finally, the analytical and numerical solutions of structural stresses and SIFs were compared and discussed. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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