Author: Mark Douglas Bowman
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 0
Book Description
Fatigue Behavior of Steel Butt Welds Containing Artificial Discontinuities
Author: Mark Douglas Bowman
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 0
Book Description
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 0
Book Description
The Effect of Discontinuities on the Fatigue Behavior of Transverse Butt Welds in Steel
Author: Mark Douglas Bowman
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 254
Book Description
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 254
Book Description
Fatigue Behavior of 5Ni-Cr-Mo-V Steel Weldments Containing Fabrication Discontinuities
Author: TW. Crooker
Publisher:
ISBN:
Category : Discontinuities
Languages : en
Pages : 25
Book Description
Fabrication discontinuities in weldments pose a serious engineering problem for structural applications involving cyclic loading. Often, the discovery of fabrication discontinuities through nondestructive inspection can pose a dilemma: if not repaired, failure can result from crack initiation and growth; however, if improperly repaired, post-repair discontinuities of even greater severity may result. Thus, rational decision-making criteria are needed to assess the mechanical severity of actual fabrication defects in weldments. This study was undertaken to explore the applicability of linear elastic fracture mechanics to characterize the fatigue behavior of high-strength steel weldments containing lack-of-penetration (LOP) and slag/lack-of-fusion (S/LOF) discontinuities. Full penetration, double-V butt welds with reinforcements removed were tested under zero-to-tension axial loading. Various filler metals and welding techniques were used. Both sound welds and welds containing discontinuities were cycled to failure. Whenever possible, cycles to crack initiation were estimated by strain gage measurements. The fracture mechanics approach was successful in correlating the fatigue lifetimes of specimens containing single LOP discontinuities of varying size. However, the fatigue behavior of specimens containing multiple S/LOF discontinuities proved to be much more complex and difficult to analyze.
Publisher:
ISBN:
Category : Discontinuities
Languages : en
Pages : 25
Book Description
Fabrication discontinuities in weldments pose a serious engineering problem for structural applications involving cyclic loading. Often, the discovery of fabrication discontinuities through nondestructive inspection can pose a dilemma: if not repaired, failure can result from crack initiation and growth; however, if improperly repaired, post-repair discontinuities of even greater severity may result. Thus, rational decision-making criteria are needed to assess the mechanical severity of actual fabrication defects in weldments. This study was undertaken to explore the applicability of linear elastic fracture mechanics to characterize the fatigue behavior of high-strength steel weldments containing lack-of-penetration (LOP) and slag/lack-of-fusion (S/LOF) discontinuities. Full penetration, double-V butt welds with reinforcements removed were tested under zero-to-tension axial loading. Various filler metals and welding techniques were used. Both sound welds and welds containing discontinuities were cycled to failure. Whenever possible, cycles to crack initiation were estimated by strain gage measurements. The fracture mechanics approach was successful in correlating the fatigue lifetimes of specimens containing single LOP discontinuities of varying size. However, the fatigue behavior of specimens containing multiple S/LOF discontinuities proved to be much more complex and difficult to analyze.
Fatigue Behavior of HY-130 Steel Weldments Containing Fabrication Discontinuities
Author: S. J. Gill
Publisher:
ISBN:
Category :
Languages : en
Pages : 39
Book Description
Fabrication discontinuities in weldments pose a serious engineering problem for structural applications involving cyclic loading. Often, the discovery of fabrication discontinuities through nondestructive inspection can pose a dilemma; if not properly repaired, failure can result from crack initiation and growth, however, if improperly repaired, post-repair discontinuities of even greater severity may result. Thus, a need exists for rational decision-making criteria to assess the mechanical severity of actual fabrication defects in weldments. This study was undertaken to explore the applicability of linear elastic fracture mechanics to characterize the fatigue behavior of high-strength steel weldments containing lack-of-penetration (LOP) and slag/lack-of-fusion (S/LOF) discontinuities. Full penetration, double-V butt welds with reinforcements removed were tested under zero-to-tension axial loading. Various filler metals and welding techniques were used. Both sound welds and welds containing discontinuities were cycled to failure. Whenever possible, cycles to crack initiation were estimated by strain gage measurements. The fracture mechanics approach was successful in correlating the fatigue lifetimes of specimens containing single LOP discontinuities of varying size. However, the fatigue behavior of specimens containing multiple S/LOF discontinuities proved to be much more complex and difficult to analyze. Originator-supplied keywords: Experimental data, Fatigue of materials, Fatigue tests, Fracture mechanics, High strength steels, Nickel chromium molybdenum steels, S-N diagrams, Weld defects, Weld metal.
Publisher:
ISBN:
Category :
Languages : en
Pages : 39
Book Description
Fabrication discontinuities in weldments pose a serious engineering problem for structural applications involving cyclic loading. Often, the discovery of fabrication discontinuities through nondestructive inspection can pose a dilemma; if not properly repaired, failure can result from crack initiation and growth, however, if improperly repaired, post-repair discontinuities of even greater severity may result. Thus, a need exists for rational decision-making criteria to assess the mechanical severity of actual fabrication defects in weldments. This study was undertaken to explore the applicability of linear elastic fracture mechanics to characterize the fatigue behavior of high-strength steel weldments containing lack-of-penetration (LOP) and slag/lack-of-fusion (S/LOF) discontinuities. Full penetration, double-V butt welds with reinforcements removed were tested under zero-to-tension axial loading. Various filler metals and welding techniques were used. Both sound welds and welds containing discontinuities were cycled to failure. Whenever possible, cycles to crack initiation were estimated by strain gage measurements. The fracture mechanics approach was successful in correlating the fatigue lifetimes of specimens containing single LOP discontinuities of varying size. However, the fatigue behavior of specimens containing multiple S/LOF discontinuities proved to be much more complex and difficult to analyze. Originator-supplied keywords: Experimental data, Fatigue of materials, Fatigue tests, Fracture mechanics, High strength steels, Nickel chromium molybdenum steels, S-N diagrams, Weld defects, Weld metal.
Studies of the Fatigue Behavior of Butt-welded Joints in HY-80 and HY-100 Steels
Author: William Herman Munse
Publisher:
ISBN:
Category : Steel, Structural
Languages : en
Pages : 224
Book Description
Publisher:
ISBN:
Category : Steel, Structural
Languages : en
Pages : 224
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 788
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 788
Book Description
Studies of the Fatigue Behavior of Butt-welded Joints in Hy-80 and Hy-100 Steels
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 110
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 110
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.
Geodex Structural Information Service
Author: Geodex International
Publisher:
ISBN:
Category : Civil engineering
Languages : en
Pages : 208
Book Description
Publisher:
ISBN:
Category : Civil engineering
Languages : en
Pages : 208
Book Description
Microscopic Study of the Fatigue Behavior of a Structural Steel Butt Weld
Author: Frederick Charles Schmitt
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 220
Book Description
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 220
Book Description
Fatigue Behavior of Butt-welded Joints in N-A-xtra 100 Steel
Author: G. R. Scott
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
Book Description