Session: DFMLC-05-01-Design for Additive Manufacturing 1

Paper Number: 88612

88612 - Design Opportunities Using High-Density Extrusion-Based Additive Manufacturing for Impact Problems 

This presentation will discuss design and design automation opportunities (both in terms of objectives and design approaches) using dense (90-100% density) polymer-based materials, structures, and systems manufactured using fused deposition modeling (or fused filament fabrication) (FDM/FFF) for mechanical applications subjected to impact loads (i.e., loads with a very high strain rate). Four different objectives will be discussed, including (1) toughening, (2) embrittling,  (3) tuning  for a particular break location or path, and (4) tuning for particular breaking rate or threshold. While similar to the objectives that should be pursued for standard static fracture and fatigue problems, some special considerations must be accounted for when the load is applied as an impact; direct comparisons will be presented during the discussion.   The discussion will also include some preliminary research results by the author, some discussion about standards and testing methods, and a brief overview of the historical use of these materials for impact-related applications. For the purposes of this talk, it will be assumed that impact energy of a material is the combination of its elastic and plastic strain energies (for impacts where no break occurs), and also includes the work required to fracture the material (in the case of a crack or full break).

Presenting Author: Albert Patterson Texas A&M University

Presenting Author Biography: Dr. Albert E. Patterson is an Assistant Professor of Manufacturing and Mechanical Engineering Technology in the Department of Engineering Technology and Industrial Distribution, with a courtesy appointment in the Department of Mechanical Engineering, at Texas A&M University. He is the director of the TAMU Manufacturability-Driven Design Lab (MDDL) and related research group. He holds a PhD in Industrial Engineering (Manufacturing and Design) from the University of Illinois at Urbana-Champaign, as well as degrees in Mechanical and Industrial Engineering from the University of Alabama in Huntsville. He has more than 8 years of experience with additive manufacturing (AM) and has over 40 publications on AM, fracture mechanics, design-for-manufacturing, engineering design, systems engineering/autonomous construction systems, and related topics. Dr. Patterson has been a member of ASME for more than 10 years and is an active member of the ASTM committees on AM and fatigue/fracture mechanics. Prior to obtaining his doctorate, he worked for several years as a practicing engineer/analyst with Boeing and the US Department of Defense (Missile Defense Agency).

Authors:

Albert Patterson Texas A&M University