ESTIMATING MECHANICAL PROPERTIES OF CELLULAR SOLID MATERIALS FROM ADDITIVE MANUFACTURING PROCESSES

Abstract

the inherent limitations of the AM process. This research aims to develop a mechanical property-estimation procedure for additively manufactured cellular materials by considering the effects of AM processes. In order to clearly understand the AM process, related parameters are categorized into four groups: (a) Design and Manufacturing process parameters (DMP), (b) Layer deposition parameters (LDP), (c) Structural element parameters (SEP), and (d) Cellular material properties (CMP). Three transformations are defined among these groups. Firstly, the functional relationship between DMPs and LDPs is established based on process-modeling simulation. The variation in LDPs due to manufacturing instabilities is quantified in the form of a stochastic distribution. Next, an as-fabricated voxel modeling approach is developed for describing the propagation of geometrical degradation from LDPs to SEPs. The effective values of SEPs are determined based on semi-rigid joint frame element formulation. Finally, a discrete homogenization approach is implemented with the semi-rigid elements to integrate the effects of AM processes into the mechanical XVI property estimation procedure. The estimation framework developed in this research can be applied to analyze the performance of additively manufactured cellular materials and help to design of cellular materials.