随着制造业轻量化的发展趋势,复杂弯曲异形充液成形管件的应用日益广泛。为了更好地研究弯曲异形复杂管件在充液成形过程中的变形规律,进行可靠的工艺设计。本文通过结合薄膜理论和塑性变形理论对弯曲管件在自由胀形状态下的应力应变进行了理论解析,并通过有限元(FE)分析对理论计算模型进行了验证。FE分析结果与理论模型基本吻合。同时分析了管材在绕弯过程的硬化行为,并探索了在不同的弯曲硬化状态下弯曲管材在自由胀形过程下的破裂位置的规律,并且用实验进行了验证,实验结果与FE分析结果吻合。 With the development trend of lightweight manufacturing, the application of complex curved shaped liquid-filled pipe fittings is increasingly widespread. In order to better study the bending deformation of complex shaped pipe fittings in the liquid filling process, the reliable process design. In this paper, the theoretical analysis of the stress-strain of the bent pipe under the condition of free bulging is carried out by combining the theory of thin film and the plastic deformation theory. The theoretical calculation model is verified by finite element analysis. FE analysis results and theoretical model basically match. At the same time, the hardening behavior of the pipe during the bending process was also analyzed. The regularity of the cracked pipe under the condition of different bending and hardening was explored. The experimental results were validated by the experiments. The experimental results are in good agreement with the FE analysis results.