Abstract
dc:description.abstractTorsional fatigue tests were conducted on 4370 steel oil quenched and tempered at 1000° F in (l) the uncharged state, (2) the hydrogen charged state, and (3) in a hydrogen environment. The tests were conducted on both smooth (K<sub>t</sub> = l.l) and V-notch (K<sub>t</sub> = 3.8) test specimens. A statistical analysis conducted at the 99% confidence limit for the smooth test specimens indicated that precharging with hydrogen increased the fatigue life of the material and also the fracture surface of the test specimens changed from a circumferential crack to a 45° diagonal crack. At a 90% confidence limit, charging with hydrogen did not affect the fatigue life of the V-notched specimens. At a 99% confidence limit for both the smooth and V-notched test specimens, testing in a hydrogen environment increased the fatigue life of the material. Bending fatigue tests were also conducted on the same material and the results indicated that charging with hydrogen decreased fatigue life of smooth test specimens (K<sub>t</sub> = l.l) but increased the fatigue life for V-notched specimens (K<sub>t</sub> = 2.4 and 3.8).
Degree
thesis:*- Name thesis:degree_name
- Ph. D.
- Level thesis:degree_level
- doctoral
- Discipline thesis:degree_discipline
- Engineering Science and Mechanics
- Department dc:contributor.department
- Engineering Science and Mechanics
- Grantor dc:publisher
- Virginia Tech
- Year dc:date.issued
- 1978
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Wilson, James H.
- Chair dc:contributor.committeechair
-
- McNitt, R. P.
- Committee members dc:contributor.committeemember
-
- Mabie, Hamilton H.
- Padis, L. A.
- Stinchcomb, Wayne W.
- Pap, Arpad A.
Rights
dc:rights- Statement dc:rights
-
- In Copyright
- Licence dc:rights.uri
- Language dc:language.iso
- en
Identifiers
dc:identifier.*- Dc Identifier Other
- etd-02062013-040204
- OAI identifier oai:identifier
- oai:vtechworks.lib.vt.edu:10919/37333