Dynamic compressive behavior of a modified additively manufactured rhombic dodecahedron 316L stainless steel lattice structure. (March 2020)

• Record Type: Journal Article
• Authors: Cao, Xiaofei; Xiao, Dengbao; Li, Ying; Wen, Weibin; Zhao, Tian; Chen, Zihao; Jiang, Yongbo; Fang, Daining
• Is Part Of: Thin-walled structures. Volume 148(2020)
• Publication Date: 2020-03
• Subjects: 316L stainless steel lattice structure -- Dynamic compression -- Mechanical properties -- Energy absorption -- Strain rate; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2019.106586
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: Dynamic compression properties of the modified rhombic dodecahedron (RD) lattice structures were investigated by using a Split Hopkinson Pressure Bar (SHPB) system. All the deformation processes were recorded and a digital image correlation (DIC) technique was employed to analyse the strain distribution during the compression process. Experimental results indicated that the modified lattice structure showed better compressive strength, plateau stress and energy absorption when compared with the original one under both quasi-static and dynamic loading conditions. The effect of the shape parameter on the deformation mechanisms of the RD lattice structure was discussed, where three different deformation modes were observed. Finite element analysis was also conducted to simulate the dynamic response of the modified lattice structure. The finite element results are in good agreement with the experimental results. Then, a mode classification map was plotted and discussed based on the numerical results. Graphical abstract: Image 1 Highlights: The modified rhombic dodecahedron (RD) lattice structures with various shape parameters are successfully fabricated by the selective laser melting technique. The strain distribution during the compression process are captured and analysed by using a digital image correlation (DIC) technique. Finite element model is established to simulate the dynamic response of the modified RD lattice structures, where three different deformation modes are observed. The modified RD lattice structures show better mechanical properties and energy absorption under the dynamic loading conditions.