Date of Award
2024
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Mechanical Engineering
Committee Chair
Nathan Spulak
Committee Member
Judith Schnieder
Committee Member
Nicholas Ginga
Research Advisor
Nathan Spulak
Subject(s)
Additive manufacturing, Stainless steel--Mechanical properties
Abstract
Additive manufacturing (AM) has several advantages over conventional subtractive manufacturing techniques, including the ability to create parts of highly complex geometries in one process thus reducing time and cost for each part. However, AM parts show different mechanical behavior compared to wrought parts due to the differences in the manufacturing processes. In particular, lack-of-fusion defects, voids, and keyhole defects can act as crack initiation sites leading to the possibility of more brittle behavior. This may be exacerbated by high rate loads, which tends to induce more brittle behavior, higher flow stress, and higher yield stress in materials. Therefore, it is critically important to characterize the material at the strain rate it will experience during use, for example in the automotive industry where the AM parts will experience dynamic loading during crash events. In this study, tension tests are performed on AM 316L stainless steel at strain rates of 10^β3 π ^-1, 1000 π ^-1, 2500 π ^-1, and 5000 π ^-1, and results are compared to conventional wrought 316L. The experimental results are used to develop a material model for finite element analysis using LS-DYNA. The microstructure in the samples are then examined.
Recommended Citation
Marler, Terrell Elias, "Quasi-static and dynamic tension testing of as-built and heat-treated additively manufactured 316L stainless steel" (2024). Theses. 674.
https://louis.uah.edu/uah-theses/674