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Notch sensitivity

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089459
EISBN: 978-1-62708-235-8
...-end fractures had originated and propagated by fatigue during continued exposure of the rods to severe cyclic loads in service. The loads on the rods developed tensile and bending stresses in the connecting ends. Contributory factors were: The presence of a notch-sensitive banded structure...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048052
EISBN: 978-1-62708-224-2
... failures had occurred in links having hardness values in the range of 375 to 444 HRB. It was revealed by the supplier that the previous hardness level of 302 to 375 HRB was increased to minimize wear which made the links were made notch sensitive and resulted in fractures that initiated at the butt-weld...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001353
EISBN: 978-1-62708-215-0
... that the failure was caused by the notch sensitivity of the forging material, which resulted in low toughness. It was recommended that fully killed carbon steel with a fine-grain microstructure be used. Redesign of the flap to remove the step in the forging that acted as a notch was also recommended. Selected...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001473
EISBN: 978-1-62708-229-7
...) that was inherently notch-sensitive and liable to rupture in a brittle manner. Discontinuities were present in the rims formed by the drain holes drilled in their abutting faces, and possibly enhanced by the stress-raising effect of microcracks in the smeared metal at their surfaces It is probable that the load...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0091857
EISBN: 978-1-62708-222-8
..., introducing tensile residual stresses on the inside radii of the shoulders and creating a localized area of fatigue susceptibility due to the inherent notch sensitivity of cold-formed 300 series stainless steel. It was established that the physical root cause was the design of the mixer blade. The addition...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001717
EISBN: 978-1-62708-217-4
... of choosing an alternative material with a lower notch sensitivity. In addition, the temperature at which this alloy is treated must be monitored to prevent coarse grain growth. As a result of this investigation and in an effort to eliminate future failures, ARL assisted in developing a cadmium brush plating...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001902
EISBN: 978-1-62708-217-4
...Abstract Abstract In a spring leg of a main landing gear, large brittle fracture zones indicated a predominately cleavage pattern with some ductile dimples, and a tiny fatigue segment disclosed fine striations. Factors influencing failure were surface decarburization, notch sensitivity...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001293
EISBN: 978-1-62708-215-0
... charging as a result of corrosion, and was aggravated by the stress concentration effects of pitting at the radius and the high notch sensitivity of the material. The failure mechanism was hydrogen-assisted and was most likely a combination of stress-corrosion cracking and corrosion fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001097
EISBN: 978-1-62708-214-3
... been established that cold-worked austenitic stainless steels lose their fatigue strength when notched. It has also been established that austenitic stainless steels in the annealed condition are not sensitive to notches. Cold-worked material is very notch sensitive, with notches decreasing the fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001124
EISBN: 978-1-62708-214-3
... in the wires established that the fractures were caused by fatigue loading attributable to wind/thermal factors at the joints. The grain flow at the joints was transverse to the wire axis, rendering the notches of the joints sensitive to fatigue loading. An additional contributory factor was intergranular...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047080
EISBN: 978-1-62708-235-8
... of aluminum alloy 6061-T6. However, flattening tests on the tubing (using strip specimens cut from the tubing), slow-bend test, notched bend test, and a bend test in which the specimens were bent by hand around a relatively small radius, indicated that the tubing material was notch sensitive and had a type...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001075
EISBN: 978-1-62708-214-3
... indicate that the correlation may be questionable. Figure 8 ( Ref 3 ) shows fatigue curves for smooth and notched fatigue samples made from cold-worked (drawn) type 304 stainless steel. It can be seen that the cold-worked material is very notch sensitive; the fatigue strength decreases from about 760...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001259
EISBN: 978-1-62708-233-4
... and when notches were machined instead of beaten with a chisel. Bolts Decarburizing Overheating Wire 41Cr 4 Heat treating-related failures A bolt manufacturer complained that wires of steel 41 Cr4 of certain shipments were prone to formation of quench cracks in the rolled threads. Since...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001360
EISBN: 978-1-62708-215-0
... initiated near a rivet hole, but it is not clear whether the hole, acting as a stress raiser, had a role in initiating the crack. The relatively high hardness of the steel may have contributed to its notch sensitivity. Once initiated, the fatigue crack propagated in both directions, producing a flat...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001055
EISBN: 978-1-62708-214-3
... lines. Certified test results from the steel mill, procedure qualification tests of the welding, and design changes to reduce water hammer were also recommended. Impact toughness Notch sensitivity Pipe joints Pipe Water pipelines Welding parameters ASTM A283 grade D UNS K02702 Joining...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003516
EISBN: 978-1-62708-180-1
..., the fatigue notch factor is obtained by dividing the endurance limit of an unnotched test specimen by the endurance limit of a notched test specimen. The fatigue notch factor can also be defined in terms of notch sensitivity, q : K f = q ( K t − 1 ) + 1 where K f...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001375
EISBN: 978-1-62708-215-0
... in a notch-sensitive material such as gray iron. The submitted valves were visually examined to determine the crack location. The crack in casting 1 was found in the drain area. The crack extended radially through the seating surface and the internal casting wall adjoining the drain. Figure 1...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001232
EISBN: 978-1-62708-233-4
... as notches. Most vibrational fractures start from such sites of stress concentration. The higher the strength of a steel, the higher is its “notch sensitivity” ( Fig. 9 ). The advantage of a high strength can be neutralized, or turned to a disadvantage, by inappropriate design or bad working. Fig. 9...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001112
EISBN: 978-1-62708-214-3
... of the web caused by its high carbon content as well as by segregation of carbon, sulfur, and phosphorus within the web. The stress concentration at the right-angle jog in the flame-cut path and the notch sensitivity caused by the adverse chemical composition probably contributed to crack initiation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001444
EISBN: 978-1-62708-231-0
... was applied, showing no prior deformation and giving a brittle fracture, indicative of considerable notch-sensitivity. It is evident that the existence of the martensitic layer facilitated the formation of cracks and that, once formed, these acted as severe notches at which brittle fractures were...