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基于ABAQUS软件环境下的动力显式热力耦合分析模块,建立了TA2薄壁钛管差温剪切弯曲过程模拟三维弹塑性热力耦合有限元模型,讨论了材料模型、热边界条件、单元类型和尺寸、质量放大等有限元建模关键问题,实验验证了有限元模型的可靠性。结果表明:(1)从有限元模型计算的精度和效率考虑,质量放大因子为10000是合理的;(2)单元尺寸越小,热力耦合实体单元模拟管材直线段传力区的温度越低,单元尺寸≤1.0 mm×1.0 mm的热力耦合壳单元模拟管材温度场的分布达到稳定;(3)与热力耦合实体单元相比,采用1.0 mm×1.0 mm热力耦合壳单元模拟的管材厚向应变分布更接近于实验结果。
Based on the dynamic explicit thermodynamic coupling analysis module under the ABAQUS software environment, a three-dimensional elasto-plastic coupled thermo-mechanical finite element model of TA2 thin-walled titanium tube under differential temperature shear deformation was established. The material model, thermal boundary conditions, cell type and size , Mass amplification and other finite element modeling key issues, the experimental verification of the reliability of the finite element model. The results show that: (1) Considering the accuracy and efficiency of finite element model calculation, the mass expansion factor of 10000 is reasonable; (2) The smaller the unit size, the lower the temperature of the force transfer zone in the straight- (3) Compared with the thermomechanically coupled solid element, the thickness-wise strain distribution of the pipe simulated by a 1.0 mm × 1.0 mm thermocouple coupled shell element is closer to that of the thermodynamic coupled shell element ≤1.0 mm × 1.0 mm In the experimental results.