Full
Outline
To address the issues of insufficient simulation accuracy for nonlinear large deformation and fracture induced by premature necking in numerical simulations of high-elongation metals, as well as prediction deviations in the failure behavior of the spot weld heat-affected zone, an SHS & linear extrapolation necking control strategy is proposed based on Considère instability theory. The modified Mohr-Coulomb (MMC) failure surface for DC03 base metal is established via mechanical tests under multiple stress states. Combined with parameter inversion technology, the failure parameters of the generalized incremental stress-state-dependent damage model for the spot weld heat-affected zone are calibrated, and verification is conducted through full-vehicle crash simulations. The results show that the numerical necking strain of DC03 material is delayed by 0.103 with a substantial efficiency improvement; the average peak error of spot weld failure simulation reaches 3.3%; the full-vehicle simulation can accurately reproduce the deformation and failure behaviors of both the base metal and the spot weld heat-affected zone. This scheme enables intelligent control of necking points, and significantly improves the accuracy of full-vehicle crash simulation and the prediction precision of structural performance boundaries.
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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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