Influence of creep constitutive models for an Al[sbnd]Si[sbnd]Cu alloy on load distribution of bolted joint

Abstract

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.