A macroscopic description of shape memory alloy functional fatigue

被引：35

作者：

Dornelas, Vanderson M. ^{[1
]}

Oliveira, Sergio A. ^{[2
]}

Savi, Marcelo A. ^{[1
]}

机构：

[1] Univ Fed Rio de Janeiro, Ctr Nonlinear Mech, Dept Mech Engn, COPPE, POB 68-503, BR-21941972 Rio De Janeiro, RJ, Brazil

[2] CEFET RJ Ctr Fed Educ Tecnol Celso Suckow Fonseca, Dept Mech Engn, BR-20271110 Rio De Janeiro, RJ, Brazil

来源：

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES | 2020年 / 170卷

关键词：

Shape memory alloys; Phase transformations; Plasticity; Transformation induced plasticity; Cyclic loading; Functional fatigue; Constitutive model; Numerical simulations; LOW-CYCLE FATIGUE; CONSTITUTIVE MODEL; MULTIAXIAL FATIGUE; LIFE-PREDICTION; PART I; TRANSFORMATION; EVOLUTION; BEHAVIOR; DAMAGE;

D O I：

10.1016/j.ijmecsci.2019.105345

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Shape memory alloys (SMAs) are smart materials employed in several applications including medical devices, aerospace components, robotics, among others. In many of these applications, devices are subjected to cyclic loading conditions. Based on this, a proper comprehension of fatigue phenomenon is essential for suitable design of systems involving SMA elements. In general, SMAs exhibit two kinds of fatigue: functional fatigue, related to the decrease of the functional properties; and structural fatigue, associated with the nucleation and growth of microcracks that lead to fracture. This paper presents a macroscopic three-dimensional constitutive model to describe functional fatigue on shape memory alloys considering continuum damage perspective. Numerical simulations are compared with experimental results showing the capabilities of the proposed model. In addition, numerical simulations are presented in order to explore the general thermomechanical aspects of SMA functional fatigue, allowing a proper comprehension of phenomenological aspects.

引用

页数：23

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