摘要
基于理想伪弹性形状记忆合金的非线性应力应变关系,文章对形状记忆合金(shape memory alloy,SMA)梁在纯弯曲载荷作用下的力学行为进行了研究;给出了加卸载过程中应力、弯矩和曲率之间的解析表达式,弯矩曲率关系呈现明显的非线性滞回特性;揭示了梁截面上各相的发展演化以及相边界的运动规律。在加载阶段相边界均随弯矩的增大向中性层移动,而在卸载阶段相边界的变化规律不仅与加载结束时表层材料所处的状态有关,还与卸载的程度有关,表现出与加载阶段完全不同的特性。
Using an ideal pesudo-elastic constitutive model of shape memory alloy（SMA）, the behavior of the SMA beam section under pure bending condition is analyzed. The analytical expressions of stress, moment and curvature are deduced. The moment-curvature relationships show nonlinear hys- teretic characteristic. The development and evolution of phase constituents and the moving law of phase boundaries are revealed. The phase boundaries move to the neutral axis with the increase of mo- ment during the loading stage, while during the unloading stage, the change law of phase boundaries is relate to the state of surface material and the degree of unloading and exhibits completely different properties.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第8期1043-1048,共6页
Journal of Hefei University of Technology：Natural Science
基金
安徽省自然科学基金资助项目(1408085ME84)
关键词
形状记忆合金
纯弯曲
相变
弯矩曲率关系
shape memory alloy（SMA）
pure bending
phase transformation
moment-curvature rela- tionship
