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Outline
To investigate the mechanical properties and failure modes of Self-Piercing Riveted (SPR) joints between steel sheets of varying strength grades and THAS cast aluminum alloy, quasi-static comparative tests are conducted under different overlap configurations and loading conditions. The results indicate that sound SPR joint quality is achieved through appropriate process design and optimized rivet-die selection, with the minimum residual bottom thickness and left/right interlock values remaining within acceptable limits. For qualified SPR joints, the peak loads under cross-tension, combined shear-tension, cross-tension peeling, and lap-shear loading conditions all increase with rising steel sheet strength, while the dominant failure mode transitions progressively from steel-side failure to aluminum-side failure. Under cross-tension loading, the peak load follows a descending order: pure cross-tension, combined shear-tension, and cross-tension peeling. Additionally, the lap-shear strength of single-rivet joints with linear overlap exceeds that of spot-welded joints employing steel sheets of equivalent grade.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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