A Computationally Efficient Modeling Approach for Predicting Mechanical Behavior of Cellular Lattice Structures

作者：Ravari M R Karamooz^*; Kadkhodaei M

来源：Journal of Materials Engineering and Performance, 2015, 24(1): 245-252.

DOI：10.1007/s11665-014-1281-4

• cellular lattice structures
• elastic modulus
• mechanical behavior
• selective laser melting
• struts' imperfections
• unit cell modeling

As the fabrication and characterization of cellular lattice structures are time consuming and expensive, development of simple models is vital. In this paper, a new approach is presented to model the mechanical stress-strain curve of cellular lattices with low computational efforts. To do so, first, a single strut of the lattice is modeled with its imperfections and defects. The stress-strain of a specimen fabricated with the same processing parameters as those used for the lattice is used as the base material. Then, this strut is simulated in simple tension, and its stress-strain curve is obtained. After that, a unit cell of the lattice is simulated without any imperfections, and the material parameters of the single strut are attributed to the bulk material. Using this method, the stress-strain behavior of the lattice is obtained and shown to be in a good agreement with the experimental result. Accordingly, this paper presents a computationally efficient method for modeling the mechanical properties of cellular lattices with a reasonable accuracy using the material parameters of simple tension tests. The effects of the single strut's length and its micropores on its mechanical properties are also assessed.

• 出版日期2015-1