2018 - Sustainable Industrial Processing Summit & Exhibition
4-7 November 2018, Rio Othon Palace, Rio De Janeiro, Brazil
| Damage Modeling of Shape Memory Alloys Vanderson Marcio Dornelas1; Sergio Almeida Oliveira2; Marcelo Amorim Savi1; 1FEDERAL UNIVERSITY OF RIO DE JANEIRO, Rio de Janeiro, Brazil; 2CENTRO FEDERAL DE EDUCAçãO TECNOLóGICA CELSO SUCKOW DA FONSECA (CEFET/RJ), Rio de Janeiro, Brazil; PAPER: 361/Manufacturing/Regular (Oral) SCHEDULED: 16:20/Wed./Mar Azul (50/1st) ABSTRACT: Shape memory alloys (SMAs) belong to smart materials being employed in several kinds of applications [1]. Modeling and simulations are essential issues to be considered for proper designs of these systems. In this regard, fatigue phenomenon is a special subject that needs to be investigated. In general, SMAs exhibit two kinds of fatigue: functional fatigue, related to the decrease of the functional properties; and structural fatigue, that is characterized by the nucleation and growth of microcracks which can lead to fracture [2]. This paper discusses a macroscopic three-dimensional constitutive model that describes functional fatigue in shape memory alloys. Comparisons between numerical and experimental uniaxial results are performed for the validation of the proposed model. In addition, general numerical simulations are presented in order to explore the general thermomechical behavior of SMAs. References: [1] M.A. Savi, A. Paiva, A.P. Baota-Neves, Journal of Intelligent Material Systems and Structures 13 (2002) 261-273. [2] G. Eggeler, E. Hornbogen, A. Yawny, M. Wagner, Materials Science and Engineering 378 (2004) 24-33. |
