SMA 智能复合构件控制裂纹的数值与试验研究

将ＴｉＮｉ形状记忆合金（ＳＭＡ）薄带复合于基体材料内部，利用形状记忆合金的特性，可以控制构件裂纹的扩展。本文介绍了智能复合构件控制裂纹的机理，并利用拟温度载荷法，直接应用现有有限元程序对控制裂纹的ＳＭＡ智能复合构件进行了计算与分析，同时还进行了激光云纹干涉法试验测试。计算和试验结果表明智能复合构件中的记忆合金薄带对构件裂纹有显著的控制效果，同时计算和试验结果的一致性也表明本文的分析方法是可行的。

STUDY ON SMA INTELLIGENT STRUCTURES FOR CRACK CONTROL

The shape memory effect of Shape Memory Alloy (SMA) was used for crack active control in an intelligent component,which was made up with TiNi belts embedded in metal matrix.A linearized constitutive relation of SMA embedded in the matrix has been derived.Such a constitutive relation can be used easily in commercial finite element programs to treat the shape memory effect as the thermal effect of conventional materials.This method was applied to the numerical ananlysis of the intelligent component.Moire Interferometric tests were carried out on the component.Comparison of the calculated with test results shows that the effect of the active control is remarkable,and the computational method is feasible.