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直缝焊管是液压胀形工艺的主要原材料,在管件液压胀形数值模拟和工艺设计中,通常使用相应板材力学性能作为焊管的力学性能,而在焊管的加工过程中,材料性能发生变化,这使得用板材性能来指导液压胀形工艺设计的可靠性大大降低,如何准确评价焊管力学性能变得越来越突出。结合理论分析和自由胀形实验,得到母材力学性能参数测试方法;由于焊接区(焊缝以及热影响区)受力状态复杂,其受力状态不能由管材形状参数和内压力来确定,采用单向拉伸试验和混合准则法,确定焊缝以及热影响区材料的力学性能参数。上述测试结果应用于方形零件液压胀形数值仿真,仿真结果与实验结果比较表明该力学性能参数测试方法是准确可靠的。
Longitudinal welded pipe is the main raw material of hydraulic bulging process. In the numerical simulation and process design of hydraulic bulging of the pipe, the mechanical properties of the corresponding plate are usually used as the mechanical properties of the welded pipe. In the process of welded pipe, the material properties change, which Which makes the reliability of the board design to guide hydraulic bulging process design greatly reduced, and how to accurately evaluate the mechanical properties of welded pipe becomes more and more prominent. Combined with theoretical analysis and free bulging experiment, the testing method of the mechanical properties of the base metal is obtained. Due to the complex state of stress in the welding zone (weld and heat affected zone), the stress state can not be determined by the pipe shape parameters and the internal pressure. Uniaxial tensile test and mixed criteria method to determine the mechanical properties of the weld and heat affected zone materials. The above test results are applied to the numerical simulation of square bulging hydraulic hydraulics. The simulation results and the experimental results show that the mechanical performance parameter testing method is accurate and reliable.