Modeling large deformations of thin-walled SMA structures by shell finite elements
نویسندگان
چکیده
Many shape memory alloy (SMA) applications, such as biomedical devices, electromechanical actuators, and elastocaloric cooling are based on thin-walled flat or shell-like structures. An advanced design of structures requires the development an efficient accurate numerical tool for simulations very thin curved SMA that may experience large deformations even buckling upon thermo-mechanical loading. So far, finite element models strain have been 3D solid formulations, which relatively inefficient solving (thin) shell problems. In this paper, we present a model analysis shells. Our is 7-parameter, large-rotation, one-director formulation, takes into account fully three-dimensional form constitutive equations isothermal transformations isotropic superelasticity, well shape-memory effect in simplified way. fact, three 4-node elements SMAs. Two them use assumed natural concepts transverse shear strains, through-the-thickness normal strain, membrane strains. The third combination enhanced concepts, applied to satisfy zero through-the-thickness-normal-stress condition geometries high degree accuracy. After detailed description shells first part examples second illustrate approach. Compared our results show excellent accuracy, with significantly reduced number degrees freedom, consequently translates reduction computational time.
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ژورنال
عنوان ژورنال: Communications in Nonlinear Science and Numerical Simulation
سال: 2021
ISSN: ['1878-7274', '1007-5704']
DOI: https://doi.org/10.1016/j.cnsns.2021.105897