复合材料管接头与钢管间摩擦力及其对管接头强度的影响——数值分析

Friction stress between a composite pipe joint and a steel pipe and its effects on strength of the composite joint——Numerical analysis

通过定义接触单元,建立了复合材料套管接头与钢管连接的有限元分析模型。分析了在钢管端部受到弯曲、压缩和扭转载荷条件下,复合材料管接头的应力状态,并采用Tsai-Wu强度准则对复合材料管接头进行了强度分析。重点研究了随着摩擦系数的变化复合材料管接头与钢管间摩擦力的变化规律及其对复合材料接头强度的影响。结果表明,随着摩擦系数的增大,复合材料管接头与钢管间最大正应力减小,最大摩擦力增大;在以弯曲载荷为主的组合载荷作用下,复合材料管接头的安全裕度增大。

A finite element model for two steel pipes connected by a composite pipe joint was developed with AN- SYS software. With the functional module of contact element in ANSYS, the stress distributions in the composite pipe joint under different contact conditions to the steel pipes （bending, compression and torsion） were obtained, and the load bearing capability of the composite pipe joint was further studied. The studies are focused on the effects of the friction coefficient on the friction stress on the contact surfaces between the steel pipe and on the composite pipe joint, and on the effects of the friction stress on the load bearing capability of the composite pipe joint. The results show that, with the increasing of the friction coefficient, the maximum contact pressure between the composite pipe joint and the steel pipe decreases and the maximum friction stress increases; the load bearing capability of the composite pipe joint is strengthened under the bending.