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Dissimilar metal welds in special vehicles and equipment are essential parts that significantly influence their performance. This study focuses on how different working temperatures affect crack propagation behavior in these welds. The research employs the extended finite element method (XFEM) as its numerical analysis tool. By refining the local mesh at the crack tip, it avoids complex crack-tip field enhancement function found in traditional methods. Temperature effects are integrated into the interaction integral, and its form is simplified to isolate terms related to material properties and temperature. The method for extracting mode I and mode II stress intensity factors is provided. Thus, a numerical calculation method for the stress intensity factor at the crack tip of dissimilar metal welds in special vehicles has been established. Taking a two-dimensional infinite plate with a crack as an example, stress intensity factors are calculated under various temperature loads and crack lengths and compared with the analytical solution. It is found that the relative error between the two is less than 1.3%, and changes in different integration regions have minimal impact on results. The correctness and integral region independence of this method have been verified. Then, based on the maximum circumferential stress criterion and the above research content, a quasi-static crack growth numerical simulation method is established for different temperatures. Simulations are conducted at low, normal, and high temperatures to examine crack propagation paths at various locations. Initial crack growth angles and paths reveal that crack propagation in the welding zone is predominantly mode I at normal temperatures. However, low and high temperatures have opposite effects on crack direction. Additionally, cracks may propagate across weld boundaries. This finding significantly advances the prediction of performance at different working temperatures in dissimilar metal welds of special vehicles and provides crucial guidance for durability and safety design in engineering applications.
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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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