Journal
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
Volume 138, Issue -, Pages 146-158Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmecsci.2018.02.008
Keywords
Elastic properties; Initial yield surface; Lattice structure; Beam theory; FEM simulation
Categories
Funding
- National Natural Science Foundation of China [11672014, 11672013, 11772027]
- Defense Industrial Technology Development Program [JCKY2016601B001, JCKY2016205C001]
- Aviation Science Foundation of China [28163701002]
- Fundamental Research Funds for the Central Universities
- Super Computing Center ScGrid/CNGrid of CAS
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The effective elastic properties of two bending-dominated lattice structures subjected to uniaxial loading are investigated with using the classical beam theory. In particular, considering the coupling effect of axial force and bending moment, a theoretical approach for predicting the yield surface of lattice structures under complex stress state is proposed. The analytical solutions are verified by comparing the predictions with finite element method (FEM) simulations. It is shown that the deformation mode of the struts is strongly dependent on the loading directions, and the lattice can be either bending-dominated or stretching-dominated in different stress states, resulting in narrow yield surfaces. The comparisons reveal that both the theoretical analysis and numerical simulations present a considerably good description of the initial yield surfaces, which provides new insight into understanding the mechanical behaviors of the lattice structures and applications in lightweight structures. (C) 2018 Elsevier Ltd. All rights reserved.
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