【摘要】 以Brinson本构模型为基础,结合平面轴对称问题中的拉梅公式,推导出一个简化的本构模型,该模型可以用来计算形状记忆合金管道连接件与被连接钢管接触面上的径向压应力,并对形状记忆合金管道接头结构进行数值模拟分析.对3组FeMnSiCr系形状记忆合金管道连接件与被连接钢管进行了高温连接试验,并测试了连接后管道连接件的拉脱力.通过经验公式可得到管道接头结构接触面上径向压应力的大小.数值模拟和试验结果对比表明,简化的本构模型是有效的,能够为形状记忆合金管道连接件的应用提供一定的依据.更多还原

【Abstract】 The Brinson constitutive model is used in conjunction with the Lame formula for a plane axial symmetry problem to deduce a simplified constitutive model that can be used to calculate the radial compressive stress on the contact surface between a shape memory alloy(SMA)pipe joint and steel tube.The numerical simulation analyses of the SMA pipe joint structures are also conducted.Three groups of FeMnSiCr series SMA pipe joints connected to steel tubes are tested at high temperatures,and the pull-off forces of these connected pipe joint are measured.Further,the radial compressive stresses on the contact surfaces of these pipe joint structures can be obtained using an empirical formula.The comparisons between the numerical simulations and experimental results show that the simplified constitutive model is effective and can provide a stable basis for application of SMA pipe joints.更多还原