Design optimization of consolidated granular-solid polymer prismatic beam using metamorphic development

Abstract

a b s t r a c tTopologically optimized granular-solid structures from additive manufacturing processes have impending applications as lightweight load bearing structures. To facilitate application, a procedure for characterizing optimal structural performance is devised for the design optimization of 'end-use' functional structures. An approach capable of realizing this objective is presented and demonstrated for horizontal prismatic beams produced from Nylon-12 granular-solid polymer, by Selective Laser Sintering (SLS). It combines topology (or layout) optimization, calibration of material parameters, and finite element (FE) modelling. The metamorphic development (MD) method forms the basis of an adaptive growth and degeneration optimization by material distribution approach. Experimental measurements are used to calibrate a bimodulus constitutive Drucker-Prager (D-P) model. Simply-supported three-point bending (3PB) tests are used to assess the fidelity of optimized beams on the basis of numerically predicted performance.

An investigation into reinforced and functionally graded lattice structures

“…The compressive modulus and yield strength of the lattice strut material (PA 2200) were found by Ngim et al 27 here are lower than might be predicted. An investigation including a range of lattice structures of varying density could explicitly determine C 1 , C 5 , n, m and α for a given lattice type and material, but this is beyond the remit of this paper.…”

“…The compressive modulus and yield strength of the lattice strut material (PA 2200) were found by Ngim et al. 27 to be 741 MPa and 55 MPa, respectively; these constitute E sol . and σ y sol .…”

Design and Mechanical Characterization of an S-Based TPMS Hollow Isotropic Cellular Structure

“…Nylon PA2200 is taken as the material for the geometries. Material properties are specified as follows: Compressive Young's modulus E S = 741 MPa, tensile Young's modulus E t = 1600 MPa, compressive yield strength σ S = 54 MPa, tensile yield strength σ t = 44 MPa [37]. According to the typical experimental boundary conditions of cellular structures [38,39], the fixed support is applied on the bottom plane.…”