基于有限元计算的形状记忆合金⁃金属玻璃复合材料变形行为

doi:10.13229/j.cnki.jdxbgxb20190869

摘要/Abstract

摘要：

利用有限元模拟方法，研究了拉伸-卸载预应变对形状记忆合金-金属玻璃复合材料力学行为的影响及其内在机理。结果表明：预处理应变增加，形状记忆合金-金属玻璃复合材料的屈服强度及弹性应变极限均提高，但拉伸延展性急剧下降。预应变增加导致形状记忆合金颗粒第二次加载时的变形行为由典型的马氏体相变过渡为连续的马氏体相变，甚至表现为纯马氏体相的弹性变形。这一“相变效应”的减弱甚至消失，是形状记忆合金-金属玻璃复合材料经拉伸-卸载预处理后拉伸性能退化的直接原因。

关键词: 复合材料, 金属玻璃, 形状记忆合金, 马氏体相变, 预处理, 有限元方法

Abstract:

The influence of tensile-unloading pre-strains on the mechanical behavior of shape memory alloy-metal glass composites and its internal mechanism were studied by finite element simulations. Simulation results show that both the yield strength and the limit of the elastic strain of the composites increase with the pretreatment strain， but the tensile ductility decreases sharply. With increasing pretreatment strain， the subsequent deformation of shape memory alloy particles shifts from a classic martensite phase transformation to a continuous martensite transformation， and finally to a simple martensite elastic deformation. The weakening or even disappearance of the phase transformation effect leads directly to the deterioration in the tensile performance of the pretreated shape memory alloy-metallic glass matrix composite.

Key words: composite materials, metallic glass, shape memory alloy, martensite phase transformation, pretreatment, finite element method

中图分类号:

TB331

杨帆,张旭东,赵蒙,折波,邓俊楷. 基于有限元计算的形状记忆合金⁃金属玻璃复合材料变形行为[J]. 吉林大学学报(工学版), 2021, 51(1): 172-180.

Fan YANG,Xu-dong ZHANG,Meng ZHAO,Bo SHE,Jun-kai DENG. Deformation behavior of shape memory alloy-metallic glass matrix composites based on finite element calculations[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(1): 172-180.

图/表 16

图1

图2

表1

MG基体本构参数"

材料参数	数值
初始自由体积 $v 0$ 弹性模量 $E$ /MPa	0.05 95 000
泊松比 $v$	0.33
原子跳跃次数 $n D$	3
几何系数 $α$	0.21
原子体积比 $β$	1
参考应力 $σ 0$ /MPa	89

表1

表2

SMA相本构参数"

材料参数	数值
奥氏体弹性模量 $E A$ /MPa	65 000
马氏体弹性模量 $E M$ /MPa	30 000
马氏体相变起始应力 $σ s A M$ /MPa	450
马氏体相变结束应力 $σ f A M$ /MPa	1 000
逆相变起始应力 $σ s M A$ /MPa	500
逆相变结束应力 $σ f M A$ /MPa	50
相变应变 $ε L$	0.045

表2

图3

图4

图5

图6

图7

图8

图9

图10

图11

图12

图13

图14

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