Model Calibration of 3D Printed Lattice Structures

Abstract

Nowadays cellular materials are receiving great attention for their excellent mechanical properties, being applied in energy absorbers or in structural components having optimized mass distribution. In this paper stretch-dominated lattice structures have been considered. A 3D periodic lattice structure of different cell size, TPMS (triply periodic minimal surface), made of epoxy resin by DLP technology was studied. Compression tests at different strain rate (10-3 to 103 1/s) have been performed and a constitutive model to assess the experimental findings has been calibrated.

Investigation on Homogeneous Modeling of Gyroid Lattice Structures: Numerical Study in Static and Dynamic Conditions

“…1). The material is a commercially available high-quality resin product (Value, Prima Creator) [3]. The features of the cells and scaffolds are reported in Table 1.…”

“…For what concern the behaviour of the base material in bulk form we used the results, showed in Fig. 6, obtained in a previous work [3].…”

“…6 True. Stress-Strain curves of the base material (Reproduced from [3], Fig. 8; where Dyn @450/s and E Dyn means the reached strain rate and the Young modulus in dynamic conditions, instead QS @0.001 /s and E QS refer to quasi-static conditions)…”

“…The mechanical response of lattice scaffold structures can be numerically evaluated either studying the unit cell [3] [4] or implementing a homogeneous material model able to reproduce the lattice mechanical behaviour. As a matter of fact, the structural behaviour of components built of lattice unit cells and, in general, of cellular materials is very hard to be analysed numerically, due to the necessity to reproduce the real structure.…”

Influence of Core Cellular Structures on Collapse Mechanisms Maps of Sandwich Beams

“…The core stiffness matrix can be obtained by Representive Volume Element (RVE) theory. It can be computed trough a homogenization analysis of the representive unit cell on its elastic properties [15,16]. Therefore, the cellular structure stiffness matrix will be the core one.…”