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Outline
To address the cracking problem during Self-Piercing riveting (SPR) on AlSi10MnMg die-cast aluminum shock towers, a combined experimental and numerical approach is employed to investigate crack initiation and propagation behavior. Optimization is conducted from 3 perspectives: the riveting process, material composition, and die-casting process. The results indicate that riveting cracking is induced by the tensile stress in the lower sheet and the compressive stress in the adjacent region, while the low elongation and porosity defects of the cast aluminum make it prone to crack initiation. A contoured riveting die reduces plastic deformation and tensile stress; Sr modification treatment optimizes the eutectic Si morphology and increases elongation; and optimizing the runner, overflow, and die temperature reduces casting defects, thereby lowering the cracking risk.
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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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