ORCID Identifier(s)

0009-0006-5295-5652

Graduation Semester and Year

2023

Language

English

Document Type

Thesis

Degree Name

Master of Science in Mechanical Engineering

Department

Mechanical and Aerospace Engineering

First Advisor

Ashfaq Adnan

Second Advisor

Ratan Kumar

Abstract

Over the past decades, additive manufacturing has become a critical material processing tool. All ranges of materials including polymers, composites, metals, and ceramics can be used to fabricate structures with complex geometries that are nearly impossible to build using conventional fabrication process. Recently, additive manufacturing methods to build polymeric structures have been advanced significantly. In particular, the emergence of multi-material printers has made it possible to seamlessly print hybrid and digital materials where materials components and compositions are digitally varied to construct fully tailored material system. In this work, using a commercially available polyjet printer (Stratasys J850 Prime 3D printer), digital materials with varying concentrations of viscoelastic Agilus30 and Vero plastic materials are created. Digital and hybrid materials with varied Shore A hardness values of 30, 60, and 95 are produced by mixing Agilus30 Black with VeroMagentaV. Then their mechanical and thermal damage behavior was studied. Dog-bone and rectangular specimens are used for tensile testing at different strain rates, with the latter having an elliptical defect in the center. Due to its higher stiffness and fracture stress, the hybrid material SH95 material behaves plastically, while the hybrid material SH30 and hybrid material SH60 materials respond similarly and are characterized by elongation and flexibility. Testing the materials' capacity to absorb dynamic energy using drop tower impacts reveals a nonlinear link between material composition and acceleration decrease. Additionally, Agilus30 Black is subjected to laser heating studies to examine its thermal damage characteristics and behavior when exposed to heat, providing insights into heat transmission and thermal stability characteristics. This study contributes valuable knowledge to the properties and performance of hybrid materials, paving the way for future research in material selection and optimization.

Keywords

Additive manufacturing, Multi-material printers, Hybrid materials, Digital materials, Viscoelastic agilus30, Vero plastic materials, Shore A hardness values, Mechanical behavior, Thermal damage, Tensile testing, Material defects, Dynamic energy absorption, Drop tower impacts, Material composition, Acceleration reduction, Laser heating studies, Heat transmission, Thermal stability, Material selection, Material optimization, Material performance, Material properties

Disciplines

Aerospace Engineering | Engineering | Mechanical Engineering

Comments

Degree granted by The University of Texas at Arlington

Download

Share

COinS