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基于ABAQUS平台,建立了单层和双层U形不锈钢波纹管液压胀形及回弹有限元模型,解决了建模中的关键问题,采用动态显示算法分析胀形过程,静态隐式算法求解回弹过程,并通过与实验获得的波纹管轮廓对比验证了模型的可靠性。基于此模型,对比分析了单层和双层波纹管胀形过程中的壁厚分布和轮廓特征。采用壁厚变化率反映壁厚变化情况,采用波厚、波高和波距变化量衡量波形尺寸的变化。研究发现:单层波纹管减薄率方面大于双层波纹管,双层波纹管内层壁厚减薄率大于外层;双层波纹管回弹后的尺寸变化大于单层管。
Based on the ABAQUS platform, the finite element models of hydraulic bulging and springback of single-layer and double-layer U-shaped stainless steel bellows were established, the key problems in the modeling were solved, the bulging process was analyzed by the dynamic display algorithm and the static implicit algorithm was solved The process was verified and the reliability of the model was verified by comparison with the experimental corrugated tube profile. Based on this model, the wall thickness distribution and the profile features of single-layer and double-layer corrugated tubes during bulging are comparatively analyzed. The change of wall thickness was used to reflect the change of wall thickness. The change of wave shape was measured by the variation of wave thickness, wave height and wave pitch. The results show that the thinning rate of single-layer corrugated tube is larger than that of double-layer corrugated tube, and the thinning rate of the inner layer of double-layer corrugated tube is larger than that of the outer layer.