INFLUENCE OF TOPOLOGY HYBRIDIZATION AND FUNCTIONAL GRADING ON COMPRESSIVE PROPERTIES OF SHEET-BASED TPMS LATTICE CORES

Chukwagozie J. Ejeh, Imad Barsoum, Rashid K. Abu Al-Rub

Research output: Contribution to conferencePaperpeer-review

Abstract

Lattice cores are essential for achieving high strength, and lightweight design of additive manufactured engineering components. The influence of topology hybridization and functional grading (i.e., cell size and relative density gradation) on the quasi-static compressive properties of the mathematically-derived sheet-triply periodic minimal surfaces (TPMS)-based lattice structures are numerically investigated in this paper. The objective is to propose an advanced meta-material design for improved mechanical functionality. The popularly investigated Schwartz diamond (D), F-Rhombic dodecahedron (FRD), and Schoen gyroid (G)topologies are considered. TheJohnson-Cook plasticity model based on an additive manufactured AlSi10Mg tensile test specimen is employed for the finite element simulations.Numerical results such as elastic modulus, yield strength, ultimate strength, specific energy absorption,and energy absorption efficiency of the lattices serve as the means of comparison. Based on the findings, a paradigm shift in the failure behavior was noticed with the functionally graded lattices, e.g. from shear-dominated to layer-by-layer collapse. The latter is desirable in the sense that, more kinetic energy can be consumed during failure. Among the studied single TPMS morphologies, the FRD lattice showed to exhibit superior compressive properties in all three design categories. Unlike the shear-band failure observed with the uniform G and D lattices, the FRD topology demonstrated a multi-segment cell layer collapse without functional gradation. On the contrary, the hybrid structures demonstrated an entirely different failure trend. Failure began in the topology with relatively the highest surface-area-to-volume ratio. Furthermore, an increase in strength was observed when the topology at the transition region began to deform plastically. Also, the novel topology (Multi-E1) showed unprecedented failure behavior with minimal stress concentrations coupled with considerably high mechanical performance. Overall, the relative density graded FRD lattice performed best mechanically.Hence, higher compressive properties of cellular materials can be achieved with the relative density graded FRD micro-architecture.

Original languageBritish English
StatePublished - 2021
Event16th International Conference on Computational Plasticity: Fundamentals and Applications, COMPLAS 2021 - Barcelona, Spain
Duration: 7 Sep 202110 Sep 2021

Conference

Conference16th International Conference on Computational Plasticity: Fundamentals and Applications, COMPLAS 2021
Country/TerritorySpain
CityBarcelona
Period7/09/2110/09/21

Keywords

  • Functional grading
  • Hybridization
  • Specific energy absorption
  • triply periodic minimal surfaces

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