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采用有限元软件分析了层叠焊接波纹管在循环拉压载荷作用下应力与应变的非线性关系、弹性工作区域的变化、弹性极限的变化等。用数值法、工程近似法、有限元法分别计算波纹管的刚度,得到的结果两两差率不超过7.4%,证明了用有限元方法对波纹管仿真模拟的可行性。为研究波纹管承压能力,将两种材料、三种波厚、四种中径两两组合,建立24个模型,在内压和外压的工况下共做了48次模拟试验。通过对比分析数据,最终得到了材料、波厚、中径对波纹管承压能力的影响。
The nonlinear relationship between stress and strain, the change of elastic working area and the change of elastic limit of laminated welded corrugated pipe under cyclic tension and compression load were analyzed by finite element software. The stiffness of the bellows was calculated by numerical method, engineering approximation method and finite element method, respectively. The result showed that the difference between each two did not exceed 7.4%. The feasibility of using the finite element method to simulate the bellows was proved. In order to study the bearing capacity of bellows, 24 models were established by combining two materials, three wave thicknesses and four medium diameters. Forty-eight simulation tests were carried out under the conditions of internal pressure and external pressure. Through the comparative analysis of the data, the influence of material, wave thickness and diameter on the bearing capacity of bellows was finally obtained.