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Effect of stress on the thermal hysteresis of martensitic transformations - A continuum based particle dynamics model
Mechanics of Advanced Materials and Structures ( IF 2.8 ) Pub Date : 2021-04-06 , DOI: 10.1080/15376494.2021.1909787
Mahendaran Uchimali 1
Affiliation  

Abstract

The hysteretic behavior of shape memory alloys (SMA) is technologically important and advantageous in some applications but detrimental in others. In this paper, the effect of stress on the thermal hysteresis of SMA during the martensite transformation is studied. A recently developed discrete particle approach referred to as the continuum based particle dynamics (CPD) is used for this study. The CPD model uses a multibody interactions among the discrete particles which is directly derived from poly-convex free energy pertinent to such material behaviors. In the analysis, temperature of the domain is considered as the control parameter and is varied uniformly through out the domain above and below the transformation temperature. The hysteresis response resulting from this thermal cycle is observed in specific heat-temperature plot (DSC curve) and strain-temperature plot. The effect of prestress on thermal hysteresis along with the corresponding martensite microstructure is modeled. The results show a decrease in hysteresis with increased stress. This effect is attributed to the force required to propagate the ledges along the twin or phase boundary, which is smaller for the stressed material as compared to the stress–free material.



中文翻译:

应力对马氏体转变热滞后的影响——基于连续体的粒子动力学模型

摘要

形状记忆合金 (SMA) 的滞后行为在某些应用中具有技术重要性和优势,但在其他应用中则有害。本文研究了马氏体转变过程中应力对SMA热滞的影响。最近开发的离散粒子方法称为基于连续体的粒子动力学 (CPD),用于本研究。CPD 模型使用离散粒子之间的多体相互作用,该相互作用直接源自与此类材料行为相关的多凸自由能。在分析中,域的温度被认为是控制参数,并且在整个域中高于和低于转变温度均匀变化。在比热-温度曲线(DSC 曲线)和应变-温度曲线中观察到由该热循环产生的滞后响应。模拟了预应力对热滞后的影响以及相应的马氏体微观结构。结果显示,随着应力的增加,滞后现象减少。这种效应归因于沿孪晶或相边界传播凸台所需的力,与无应力材料相比,受应力材料的力较小。

更新日期:2021-04-06
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