Creep-Fatigue Interaction of Notched 304 Stainless Steel Bars
Wu, Kuang-Hsi
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https://hdl.handle.net/2142/70127
Description
Title
Creep-Fatigue Interaction of Notched 304 Stainless Steel Bars
Author(s)
Wu, Kuang-Hsi
Issue Date
1984
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Abstract
Circular-notched and sharp-notched 304 stainless steel specimens were subjected to constant load creep, cyclic loading with hold-time and fatigue loadings at 650(DEGREES)C to determine the lives, failure modes and to understand creep-fatigue interaction mechanisms. The hold-times are one minute and ten minutes. Double-notch specimens were used so that the material under semi-damaged condition in one notch can be examined when the other is broken. Stress analysis, life prediction and microstructure studies were carried out.
It was found that for circular-notched specimens, creep failure mechanism predominates and no creep-fatigue interaction takes place. Cyclic loadings have a beneficial effect of prolonging the specimen life at a very short hold-time loading. Fracture initiates from the center of the specimen, except at very high frequency tests. For sharp-notched specimens strong creep-fatigue interaction occurs at short hold-time tests and the lives of specimens are reduced significantly. At a long hold-time the interaction effect is minor. Fracture of all specimens initiates from the notch root.
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