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tensile fatigue cracks

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Published: 01 January 2002
Fig. 12 Schematic illustration of transition from flat (tensile mode) fatigue crack propagation to growth on a slant plane (shear mode). Propagation on a slant plane can occur in relatively thin, tough materials at high growth rates. Source: Ref 14 More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c0047151
EISBN: 978-1-62708-227-3
... the conclusion that the connecting rods were rendered susceptible to fatigue-crack initiation and propagation by the notch effect of coarse folds formed during the forging operation. One fracture was caused by fatigue resulting from operating stresses, and the other was a secondary tensile fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001195
EISBN: 978-1-62708-227-3
... the location of the fracture surfaces. At position I there is a fatigue fracture brought about by operational stress, whereas the fibrous fracture surface II is a secondary tensile fracture. Furthermore the transition on the other side of the rod is cracked symmetrically to the fatigue fracture (position III...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001465
EISBN: 978-1-62708-231-0
... that the cracking was caused by lateral deflection of the rails under in-service loads. The web of a rail would normally be loaded in compression but, should lateral movements occur, then it would be subjected to bending stresses and fatigue cracks could break out in regions where excessive tensile components...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0047414
EISBN: 978-1-62708-233-4
... Abstract There was a fracture of an anchor link that rides on a post with a spherical surface. No bevel or radius was called for, leaving an extremely sharp edge. A fatigue crack grew from the top sharp edge. The casting had good toughness and strength (1448 MPa, or 210 ksi, tensile strength...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001090
EISBN: 978-1-62708-214-3
... that failure of the bellows occurred via fatigue. The crack in the bellows had widened considerably after the fracture, and the bellows had been severely compressed on the fracture side prior to failure. Based on these observations, it was concluded that bellows had been damaged prior to installation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001434
EISBN: 978-1-62708-236-5
... Abstract One of the connecting rods of a vertical, four-cylinder engine with a cylinder diameter of 5 in. failed by fatigue cracking just below the gudgeon-pin boss. Failure took place in line with the lower edge of a deposit of weld metal. The fracture surface was smooth, conchoidal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0048535
EISBN: 978-1-62708-218-1
... Abstract A stick-shift from an automobile transmission failed in service. Failure occurred by stable fatigue crack propagation at locations R and L. Plausibly, the crack initiated at location R due to maximum tensile stress, which was perhaps further concentrated by a surface imperfection...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001802
EISBN: 978-1-62708-241-9
... D.C. , and Ramamurty U. : “ Fatigue Crack-Growth in Shape-Memory NiTi and NiTi-TiC Composites ,” Mat. Sci. Eng. A , 2000 , 289 , pp. 208 – 216 . 10.1016/S0921-5093(00)00882-0 5. Reinoehl M. , Bradley D. , Bouthot R. , and Proft J. : “ The Influence of Melt...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047779
EISBN: 978-1-62708-223-5
... overstress as the smooth-textured fatigue zone was relatively large compared with the crystalline textured coarse final-fracture zone. The fatigue crack was nucleated by the nonmetallic inclusion that intersected the surface and initiated in the 0.25 mm radius fillet at a change in section due to stress...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046966
EISBN: 978-1-62708-229-7
... that extensive residual tensile macrostresses could have contributed to cracking at the leading edges. Conclusions Cracking of the airfoil sections was caused by thermal fatigue and was contributed to by low ductility due to age hardening, subsurface oxidation related to intragranular carbides, and high...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003544
EISBN: 978-1-62708-180-1
... results in progressive localized permanent structural change and occurs in materials subjected to fluctuating stresses and strains. It may result in cracks or fracture after a sufficient number of fluctuations. Fatigue fractures are caused by the simultaneous action of cyclic stress, tensile stress...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0048164
EISBN: 978-1-62708-217-4
... in the deformed region, reducing the capacity of the material to withstand fluctuating tensile stresses due to applied loads. Ultimately, a crack started at the corner where the fluctuating tensile stress was highest under combined side and drag loads. This crack progressed by fatigue over a relatively long...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0046155
EISBN: 978-1-62708-233-4
... at a region of tearing and that the cracks had propagated by fatigue. Some intergranular features observed near the origins were associated with the tearing. Standard-size round tensile specimens were cut from the thick sections of the post on each side of the fracture and prepared. The axis of each...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001291
EISBN: 978-1-62708-215-0
... revealed that the cracking was caused by the combination of incorrect grinding procedure, the presence of hydrogen, and fatigue. The grinding damage generated tensile stresses in the steel, which caused intergranular cracking during the plating cycle. The intergranular cracks were initiation sites...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001421
EISBN: 978-1-62708-235-8
... that cracking was due to corrosion-fatigue, which arose from the combined effect of a fluctuating tensile stress in the presence of a mildly corrosive environment. Corrosion environments Magnetic particle testing Optical microscopy Steam pipes Tensile stress Weld metal Welded steel Joining-related...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001346
EISBN: 978-1-62708-215-0
...). In the case of Unit 2, the fatigue cracks were mostly from the flue gas side. A few cracks were found propagating from the steam side. Crack initiation and propagation from the outer side of the tube is quite logical because the highest tensile stresses are concentrated on the outer diameter of the tube...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001459
EISBN: 978-1-62708-234-1
... bending moment, therefore, a rotating shaft is more liable to fail by fatigue cracking than one that is stationary because the area of the surface on which the tensile stress acts is increased and in consequence the number of potential sensitive spots is greater. It is well known that large components...
Image
Published: 01 June 2019
Fig. 1 Steel connecting rod end that fractured and cracked in service because of a forging fold. (a) Reassembled rod end showing locations of fractures and crack. Arrow A shows a fatigue fracture; arrow B, a secondary tensile fracture; arrow C, the crack. (b) Fracture surfaces of the broken More
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001382
EISBN: 978-1-62708-215-0
... origin was typical of fatigue. The ultimate tensile strength of the bolt was in excess of requirements. Wear patterns indicated that the bolt had been frozen in position for a protracted period and subjected to repeated bending stresses, which resulted in fatigue cracking and final complete fracture...