Creep of materials under high temperature conditions will greatly affect the reliability of bolted connections. This current paper focuses on the influence of the creep constitutive model for an AlSiCu alloy material on the load-bearing law of threaded teeth under high temperature environment. In order to obtain more accurately the creep law of the AlSiCu alloy in high temperature environment, the uniaxial tensile creep tests at 250 °C, 300 °C and 350 °C were carried out on the AlSiCu alloy specimens. Two creep constitutive model parameters are obtained by fitting the creep test data respectively. Then, the bolt connection combination structure model is established, and the bearing law of the bolt connection combination structure under different temperatures is calculated by ABAQUS, and the influence of the two creep constitutive models on the thread load law is analyzed. The results indicate that the modified Graham creep constitutive model has little effect on the load-bearing distribution of threads at 250 °C, and the time-hardening creep constitutive model has little effect on the load-bearing distribution of threads at 300 °C and 350 °C.

材料在高温条件下的蠕变会极大地影响螺栓连接的可靠性。本文重点研究高温环境下铝硅铜合金材料蠕变本构模型对螺纹牙承载规律的影响。为了获得更准确的Al的蠕变法的Si在高温环境Cu合金，在250℃，300℃和350℃单轴拉伸蠕变试验在Al进行硅铜合金试样。分别拟合蠕变试验数据得到两个蠕变本构模型参数。然后,建立螺栓连接组合结构模型,利用ABAQUS计算螺栓连接组合结构在不同温度下的承载规律,分析两种蠕变本构模型对螺纹载荷规律的影响。结果表明，修正的Graham蠕变本构模型对螺纹在250℃时的承载分布影响不大，时效蠕变本构模型对螺纹在300℃时的承载分布影响很小， 350℃。