Fatigue Behavior of Defective Welded Joints in HY-80 Steel Subjected to Axial Loading PDF Download
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Author: J. E. JR. ZIMMERMAN
Publisher:
ISBN:
Category : Strength of materials
Languages : en
Pages : 1
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Book Description
Defective welds in 3/4 in. HY-80 steel and the fatigue behavior of such welds were investigated. Included were lack of penetration, porosity, and slag inclusions; the major types of internal weld flaws which are likely to occur under field conditions. Methods of consistently producing these weld flaws were developed which made possible the prediction of the size and location of the flaws. Various means of non-destructive testing, including visual, magnetic particle, dye penetrant, and radiographic inspection, were used to investigate the defective weldments. In addition, a method of measuring the size and the depth of the flaws in the welds was developed. Axial fatigue tests on plain plate specimens and transverse buttwelded specimens have been conducted to investigate the effects of surface condition and the presence of defective welds on the behavior of such members. The results of the tests have indicated that the flaws can have a marked effect on the fatigue resistance of the members. (Author).
Author: J. E. JR. ZIMMERMAN
Publisher:
ISBN:
Category : Strength of materials
Languages : en
Pages : 1
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Book Description
Defective welds in 3/4 in. HY-80 steel and the fatigue behavior of such welds were investigated. Included were lack of penetration, porosity, and slag inclusions; the major types of internal weld flaws which are likely to occur under field conditions. Methods of consistently producing these weld flaws were developed which made possible the prediction of the size and location of the flaws. Various means of non-destructive testing, including visual, magnetic particle, dye penetrant, and radiographic inspection, were used to investigate the defective weldments. In addition, a method of measuring the size and the depth of the flaws in the welds was developed. Axial fatigue tests on plain plate specimens and transverse buttwelded specimens have been conducted to investigate the effects of surface condition and the presence of defective welds on the behavior of such members. The results of the tests have indicated that the flaws can have a marked effect on the fatigue resistance of the members. (Author).
Author: J. Elton ZIMMERMAN (and MUNSE (William Herman))
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: A. J. Hartmann
Publisher:
ISBN:
Category : Strength of materials
Languages : en
Pages : 1
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Book Description
Axial load fatigue tests on various types of welded joints and weldments in HY-80 steel are reported. The tests were carried out using three stress cycles; complete reversal, zero-totension, and half tension-to-tension. Most of the test lives lie between 2,000 and 600,000 cycles. These results have been used to develop Modified Goodman diagrams. A preliminary series of fatigue tests was carried out to study the effects of interpass temperature, lack of penetration, type of electrode, and longitudinal fillet welded attachments. When the specimens of a given test series failed due to an internal flaw, there was often a large amount of scatter in the test lives at a given stress level. Apparently internal weld flaws have a significant effect on the fatigue behavior of a welded joint. (Author).
Author: Alois Joseph HARTMANN (and MUNSE (William Herman))
Publisher:
ISBN:
Category :
Languages : en
Pages : 135
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Book Description
Author: William Herman Munse
Publisher:
ISBN:
Category : Steel, Structural
Languages : en
Pages : 224
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Book Description
Author: J. B. Radziminski
Publisher:
ISBN:
Category : Strength of materials
Languages : en
Pages : 94
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 110
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Book Description
The results of axial fatigue tests of transverse butt welded joints in HY-80 steel containing internal defects are reported. The tests were conducted on 3/4 in. and 1-1/2 in. thick material under stress cycles of zero- to-tension and complete reversal. The types of weld defects studied include porosity, slag inclusions, and artificially produced pores, and show that the existence of weld defects measurably decreases the fatigue life of a joint at a given stress cycle when compared to sound welded specimens (with reinforcement removed). However, there does not appear to be a simple correlation between type of defect or amount of defective area and fatigue strength. As part of the study of weld defects, radiographic and ultrasonic techniques were employed to determine the time to initiation and propagation of fatigue cracks in welded joints. The subsequent crack propagation progresses slowly and erratically at first, but the rate of growth is rapidly accelerated from the time it reaches the specimen surface until complete failure occurs. Metallurgical studies were conducted to examine the effect of restraint during welding on the formation of internal microcracks (sulfide inclusions) in welded joints, and the behavior of these joints under conditions of fatigue.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 212
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Book Description
Author: A. J. Hartmann
Publisher:
ISBN:
Category : Strength of materials
Languages : en
Pages : 50
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Book Description
Author: T R Gurney
Publisher: Woodhead Publishing
ISBN: 1845691032
Category : Technology & Engineering
Languages : en
Pages : 457
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Book Description
Fatigue is a mechanism of failure which involves the formation and growth of cracks under the action of repeated stresses. Ultimately, a crack may propagate to such an extent that total fracture of the member may occur. To avoid fatigue it is essential to design the structure with inherent fatigue strength. However, fatigue strength for variable amplitude loading is not a constant material property and any calculations are necessarily built on a number of assumptions. Cumulative damage of welded joints explores the wealth of research in this important field and its implications for the design and manufacture of welded components.After an Introduction, chapter two introduces the constant amplitude database, which contains results obtained in test conditions and which forms the basis of the basic S-N curves for various types of joint. Chapter three discusses the influence of residual stresses which can have a marked effect on fatigue behaviour. Chapter four explores variable amplitude loading and the problem of how information from laboratory tests, obtained under constant amplitude conditions, can be applied to the design of structures for service conditions. This problem is further investigated in the next chapter which is devoted to two and three level load testing. Chapters six, seven and eight look at the influence that the variety of variable loading spectra can have on fatigue strength, whether narrow or wide band loading or cycles of small stress range. Taking all of this knowledge, chapter nine discusses structure designs.Cumulative damage of welded joints is a comprehensive source of invaluable information for welding engineers, supervisors, inspection personnel and designers. It will also be of great interest for academics working in the fields of structural and mechanical engineering. - Covers the wealth of research in the field of fatigue strength and its role in the design and manufacture of welded components - Invaluable reference source for welding engineers, supervisors, inspection personnel and designers
