Fatigue tests in reversed torsion were run on 2024-T351 aluminum alloy specimens into which hydrogen had been diffused. The diffusion was accomplished by placing the specimens in a hydrogen environment (>99.5%) for 25 days at 2000 psi [13.8 MPa] and 123°C. A control group was tested which underwent the same temperature conditions for 25 days. The fatigue tests were run at low (20-25%) and high (85-90%) relative humidities and at shear stress levels of approximately 13400, 16800, and 20100 psi [89.6, 117, and 138 MPa].
The results of this investigation show that hydrogen charging has no effect on the torsional fatigue life of aluminum. However, a change in the crack propagation angle at high relative humidity for a ductile, circumferential crack on uncharged specimens to a brittle, 45° crack on hydrogen-charged specimens may be the result of hydrogen embrittlement. / Master of Science
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/64657 |
| Date | January 1978 |
| Creators | Kauffmann, Charles Joseph |
| Contributors | Mechanical Engineering |
| Publisher | Virginia Polytechnic Institute and State University |
| Source Sets | Virginia Tech Theses and Dissertation |
| Language | English |
| Detected Language | English |
| Type | Thesis, Text |
| Format | vi, 64 leaves, application/pdf, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
| Relation | OCLC# 39900988 |
Page generated in 0.0022 seconds