带筋钛合金型材电热耦合仿真与温度场行为分析

The electro-thermal coupling finite element simulation test was carried out on the U-shaped titanium alloy profile with stiffeners. Firstly, the finite element model of U-shaped profile with different thicknesses of stiffeners was established, and the convective heat transfer coefficient at different temperatures (20-750℃) during the heating process was calculated and given. The Joule heat generated by the current applied to the profile was used as the internal heat source. At the same time, the electrical and thermal coupling transient simulation calculations were carried out considering the radiation heat transfer and natural convection heat transfer between the profile and the environment. By comparing the test results of the profile with stiffeners with that of the constant section profile, it is found that the temperature of the stiffeners decreases in different degrees, which is mainly due to the reduction of heat generation power caused by the decrease of local resistance. At the same time, the heat exchange between the stiffeners and the surrounding profile makes the profile produce a local cooling area. Stiffeners with different sizes and non-uniform current distribution are the influencing factors of temperature distribution of profiles with stiffeners. Therefore, the influence of stiffener thickness on the cooling area was further studied and summarized.