Title: Compression Experiment and Simulation Study of Shape Memory Alloy Lattice Structure
Authors: Sean Chu and Jie Lu
Abstract: As a new type of cellular metal material, pyramidal lattice structure has many excellent characteristics,such as light weight, high specific strength, high specific stiffness , good energy absorption and buffer performance, and has been applied in military and aerospace fields. Firstly, Ti-54%Ni shape memory alloy(Xi'an Saite Co., Ltd.) was used to fabricate the SMA pyramid lattice structure.The wire cutting method is applied to process lattice structure core with thickness of 1.1mm and 1.8m respectively.The lattice structure is assembled and bonded by epoxy resin. Then static compression experiment was carried out by Zwick 2010 universal testing machine. Secondly, the ultimate bearing capacity, failure mode and heat recovery effect of Ti-Ni shape memory alloy lattice materials at different compression speeds are studied by experiment and simulation. The finite element software of HYPERMESH and ANSYS are used to simulate compression process, and SMA element in ANSYS is applied. The stress-strain curves obtained by finite element simulation are compared with the stress-strain curves obtained by compression experiment. The results show that the simulation prediction agrees well with the experimental results. By comparing and analyzing the same size steel lattice structure, the elastic deformation mechanism of SMA lattice structure is discussed. After heating, the original shape is restored and the residual deformation is small.
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Conference: SAMPE 2019 - Charlotte, NC
Publication Date: 2019/05/20
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