Thesis
Development of a high strain tensile test system and the dynamic responses of two types of sheet metals with F.C.C crystal structure
Washington State University
Master of Science (MS), Washington State University
2010
Handle:
https://hdl.handle.net/2376/100844
Abstract
High strain rate testing has been an important aspect of understanding material behavior as it has long been known that many materials have stress-strain characteristics depending upon strain rates. The design and development of a tensile split Hopkinson bar is covered in detail, focusing particularly on the design of the tensile pulse generation, through use of a striker and anvil. The various changes made to each of the components are covered with the resulted stress pulse from each change. Theoretical reasoning is given for each change in stress pulse shape and the final design of the system is also shown in detail. High strain rate stress-strain characteristics were determined for 6061-T6 aluminum and 304 stainless steel. The procedure for calculating the stress-strain results from the experimentally obtain strain-time history is given. Determination of specimen geometry is outlined with supporting FEA results. It was found that production of a tensile pulse capable of being used to derive stress-strain characteristics is accomplished through a minimizing of the impedance mismatch between the striker, anvil and incident bar. Both materials, aluminum and stainless steel, were tested at two thicknesses of 0.04 and 0.08 inches for the aluminum and 0.036 and 0.075 inches for the stainless steel. Strain rates around 2000 sec-1 were achieved for each material and thickness. The dynamic stress-strain characteristics of each are presented in detail along with qausi-static tensile testing for comparison.
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Details
- Title
- Development of a high strain tensile test system and the dynamic responses of two types of sheet metals with F.C.C crystal structure
- Creators
- Christopher Paris
- Contributors
- Jow-Lian Ding (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525009001842
- Language
- English
- Resource Type
- Thesis