Φ10mm NiTiNb形状记忆合金管接头数值模拟分析

Numerical Simulation Analysis on Φ10mm NiTiNb Shape Memory Alloy Pipe-coupling

采用数值模拟方法,研究了不同壁厚和内筋高度的NiTiNb形状记忆合金管接头径向应力与拉脱力随温度变化的定量关系。建立了能描述NiTiNb形状记忆合金管接头力学行为的本构方程,对径向应力与拉脱力进行了模拟计算,得到了NiTiNb形状记忆合金管接头在恒约束应变恢复过程中径向应力随温度的变化规律。采用数值模拟法分析了不同壁厚和内筋高度的管接头对径向应力的影响,掌握了拉脱力的变化规律,确定出NiTiNb形状记忆合金管接头最佳的壁厚和内筋高度。

The temperature-dependent quantitative relation between radial pressure and pull-out force of NiTiNb shape memory alloy pipe-coupling with different wall-thicknesses and inner rib heightes was investigated by numerical simulation method. The constitutive equation which could describe the mechanical behavior of NiTiNb shape memory alloy pipe-coupling was established by this investigation. The temperature-dependent changing rule of radial stresses of NiTiNb shape memory alloy pipe-coupling in the recovery process of constrained strain was found by the simulation calculation of radial stress and pull-out force. The effects of pipe-coupling with different wall-thicknesses and inner rib heightes on the radial stress were analyzed by numerical simulation method. The changing rule of pull-out force was grasped. And finally, the best wall-thickness, and inner rib and height NiTiNb shape memory alloy pipe-coupling were determined.