On the fracture toughness of shape memory alloys
On the fracture toughness of shape memory alloys
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DOI：
10.1007/s10704-022-00648-w
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发表时间：
2022-06
影响因子：
2.5
通讯作者：
Mohammed Y. Alsawalhi;C. Landis
中科院分区：
文献类型：
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作者：
Mohammed Y. Alsawalhi;C. Landis
在有限元计算中建立了形状记忆合金热力学本构行为的现象学本构模型，以模拟稳态I型裂纹扩展过程中由奥氏体向马氏体相变和马氏体变形引起的增韧。裂纹尖端附近相变的产热过程影响裂纹尖端附近温度的变化，从而影响材料在裂纹尖端附近的力学行为。识别了与本构模型的热力学参数、裂纹扩展速度和试样温度相关的几个无量纲参数，并应用这些参数研究了裂纹尖端的热力学场以及裂纹尖端附近非线性热力学过程对断裂韧性的增强。
A phenomenological constitutive model for the thermomechanical constitutive behavior of shape memory alloys is implemented within finite element calculations to model the toughening due to the austenite to martensite phase transformation and martensite deformation during steady mode I crack growth. The process of heat generation during phase transformation near crack tip effects the temperature variations and thus the mechanical behavior of the material near the growing crack tip. Several dimensionless parameters relating the thermomechanical parameters of the constitutive model, the crack growth velocity, and the prevailing sample temperature are identified and applied to study the thermomechanical crack tip fields and the fracture toughness enhancement due to the nonlinear thermomechanical processes in the vicinity of the crack tip.