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|Title:||Creep-Fatigue Interaction of Notched 304 Stainless Steel Bars|
|Department / Program:||Mechanical Engineering|
|Degree Granting Institution:||University of Illinois at Urbana-Champaign|
|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.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984.
|Date Available in IDEALS:||2014-12-15|
This item appears in the following Collection(s)
Dissertations and Theses - Mechanical Science and Engineering
Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois