钛合金电磁铆接数值模拟

Numerical Simulation of Electromagnetic Riveting for Titanium Alloy

为了更深入地认识钛合金铆钉成型时镦头内温度场的变化及其对绝热剪切带形成的影响,在ABAQUS平台上建立了3D有限元模型,综合考虑了材料的应变硬化、应变率硬化、热软化效应及摩擦和结构的非线性。计算表明:剪切带内应变高度集中,温升高达500℃,高温区域与剪切带基本重合,最高温度超过了其再结晶温度。

To better understand the temperature field in the upsetting head of a titanium alloy rivet and its influence on the forming of ASBs, a three dimensional FE model was built on the ABAQUS platform, fully taking into consideration the strain hardening, strain rate hardening and thermal softening effect of the rivet material and friction and nonlinear behavior of the structure. Computation results show that ASBs experience a high strain concentration during the process and the high temperature zones coincide with the ASBs basically. It is observed that the temperature rise in the ASBs reaches to 500 ℃, which means the highest temperature in the rivet exceeds its recrystallization temperature.