Finite element models of friction behaviour in linear friction welding of a Ni-based superalloy
Finite element models of friction behaviour in linear friction welding of a Ni-based superalloy
复制标题
镍基高温合金线性摩擦焊接摩擦行为的有限元模型
DOI：
10.1016/j.ijmecsci.2019.01.014
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发表时间：
2019-03-01
影响因子：
7.3
通讯作者：
Zou, Zengda
中科院分区：
文献类型：
--
作者：
Geng, Peihao;Qin, Guoliang;Zou, Zengda
在摩擦焊接模拟中，热机械场（如温度场、接触应力场和应变场）的准确预测与热机械性能、材料本构模型，特别是摩擦行为密切相关。在这项工作中，摩擦建模的界面温度，烧断率，和其他工艺变量在线性摩擦焊（LFW）的影响进行了研究，使用有限元（FE）模拟在ABAQUS中。分别采用滑动模型和滑动-粘附模型来描述摩擦条件。结果表明，摩擦系数不变的滑动模型和有限切应力不变的滑动-粘附模型预测的摩擦热流较大，导致温度和燃尽率的估计值高于实验值。此外，平均摩擦热通量随摩擦系数和极限切应力的减小而减小。在所研究的焊接参数下，摩擦系数随时间变化的滑动模型和受材料剪切流动应力限制的滑动-粘着模型能更准确地模拟LFW。通过比较塑性变形区的形貌，进一步验证了摩擦模型在预测界面热力学状态方面的准确性。采用材料剪切流动应力约束的滑移-粘着模型，能更合理地模拟界面处的温度场和应变场分布，较好地反映了LFW过程中滑移-粘着行为的摩擦特性。
The accurate prediction of the thermo-mechanical fields such as temperature, contact stress, and strain fields is strongly related to the thermo-mechanical properties, material constitutive model, and particularly friction behaviour in simulations of friction welding. In this work, the influence of friction modelling on the interface temperature, burn-off rate, and other process variables in linear friction welding (LFW) is investigated using finite element (FE) simulations in ABAQUS. Sliding model and sliding-sticking model are respectively used to characterise the friction condition. Results show that a greater friction heat flux is predicted by the sliding model with an invariable friction coefficient and the sliding-sticking model with a fixed limited shear stress, resulting in an overestimation of the temperature and burn-off rate compared to the experimental results. Additionally, the average friction heat flux decreases with a decrease in friction coefficient and limited shear stress. Under the investigated welding parameters, the sliding model with the variable-dependent friction coefficient and sliding-sticking model limited by material shear flow stress provide more accuracy in simulations of LFW. The accuracy of friction models in predicting thermo-mechanical condition at the interface is further validated by comparing the plastic deformation zone morphology. The distribution of temperature and strain fields at the interface can be simulated more reasonably by using the sliding-sticking model limited by material shear flow stress, which suitably represents the friction of the sliding-sticking behaviour during LFW.