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Title:Creep-Fatigue Interaction of Notched 304 Stainless Steel Bars
Author(s):Wu, Kuang-Hsi
Department / Program:Mechanical Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(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.
Issue Date:1984
Type:Text
Description:236 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984.
URI:http://hdl.handle.net/2142/70127
Other Identifier(s):(UMI)AAI8502349
Date Available in IDEALS:2014-12-15
Date Deposited:1984


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