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insufficient fillet radius

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001794
EISBN: 978-1-62708-241-9
... low-alloy steel insufficient fillet radius fractography hardness 4340 (low-alloy steel) UNS G43400 Background According to the information provided at the beginning of our investigation, the submitted specimen is the drive shaft in the propulsion system of a boat that operated...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001466
EISBN: 978-1-62708-221-1
... of the shaft arising from misalignment were responsible for the fatigue failure, which occurred in a region of stress concentration where insignificant fillet radius had been provided. Bend properties Gear boxes Hoists Stress concentration Alloy steel Fatigue fracture This shaft, which carried...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0048630
EISBN: 978-1-62708-217-4
... assembly to finger-tightness, and the consequent wrench torquing caused the actual fractures. The very small radius of the fillet between the bolt head and the shank undoubtedly accentuated the embrittling effect of the hydrogen. To prevent reoccurrence, the cleaning and cadmium-plating procedures were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0048077
EISBN: 978-1-62708-221-1
... by microscopic examination. The shaft was identified by chemical analysis to be 1040 steel (hardness 170 HRB) which was concluded to have insufficient fatigue strength. The step at the base of the fillet was revealed as the point of initiation of the fatigue crack. Shaft material was changed to 4140 steel oil...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0047140
EISBN: 978-1-62708-234-1
... that superficial working of the metal, probably insufficient hot working, produced a microstructure in which the carbide particles were not broken up and evenly distributed. As a result, the grains were totally surrounded with brittle carbide particles. This facilitated the formation of a crack at a fillet...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001847
EISBN: 978-1-62708-241-9
... underneath. This led to further wear and an increase in friction between the sleeve and bearing bush. Fatigue crack initiation occurred at the root fillet because of stress concentration and large frictional forces. Insufficient nitriding depth facilitated the propagation of fatigue cracks. bearing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0047558
EISBN: 978-1-62708-236-5
..., and the support plate of the exciter should be braced to reduce the amount of transmitted vibration. Also, the fillet in the exciter shaft should be carefully machined to provide an adequate radius. Electric generators Fillet welds Stress concentration Vibration Weld deposited coatings 4130 UNS G41300...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001764
EISBN: 978-1-62708-241-9
... fillet radius AISI 5046 (chromium alloy steel) UNS G50460 Introduction An investigation and analysis of drive shaft failures in many of the newly acquired articulated buses put into service by a large municipal transit agency were conducted. According to data provided by the transit agency...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006810
EISBN: 978-1-62708-329-4
... concentration is a small-radius fillet at the junction of a shoulder and a smaller-diameter portion of a shaft or at the bottom of a keyway. Such a fillet usually results in the contour of the fracture surface being convex with respect to the smaller-section side. The crack-front pattern shown in Fig. 2(g...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003509
EISBN: 978-1-62708-180-1
... geometry (included angle or root opening too small) Improper backgouging (narrow or shallow) Unbalanced heat input To prevent cracking in multiple-pass groove or fillet welds: Increase bead size of the first pass by using lower travel speed, a short arc, and an uphill (∼5°) welding mode...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
... will lead to a pattern of beach marks such as that shown in Fig. 2(g) , (h), or (j). An example of a severe stress concentration is a small-radius fillet at the junction of a shoulder and a smaller-diameter portion of a shaft or at the bottom of a keyway. Such a fillet usually results in the contour...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006808
EISBN: 978-1-62708-329-4
.... Fig. 3 Schematic of defects and discontinuities in welded joints Fig. 4 Weld discontinuities affecting weld shape and contour. (a) Undercut and overlap in a fillet weld. (b) Undercut and overlap in a groove weld. (c) and (d) Underfill in groove welds It is important to understand...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006830
EISBN: 978-1-62708-329-4
... marks, and threaded sections often act as points of crack initiation. Small fillets, sharp corners, grooves, and threads act as stress raisers from which fatigue cracks initiate and fractures propagate. Correct design of a threaded shank on a hook, for example, and the stress-relief groove at the base...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001811
EISBN: 978-1-62708-180-1
..., and threaded sections are often points of initiation of cracks. Small fillets, sharp corners, grooves, and threads act as stress raisers from which fatigue cracks initiate and fractures propagate. Correct design of a threaded shank on a hook, for example, and the stress-relief groove at the base of a threaded...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001602
EISBN: 978-1-62708-229-7
... fillet radius ( Fig. 2 ). The fracture then changed direction and ran out to the z-notch noncontact face along the trailing knife-edge seal. The entire fracture surface on the pressure side was uniformly covered with a dark brown to black colored scale. A dendritic pattern was evident over most...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001812
EISBN: 978-1-62708-180-1
... stress raisers and unfavorable shear planes. Source: Ref 4 The shape and size of the head-to-shank fillet also have an important influence on fatigue performance. In general, the radius of this fillet should be as large as possible while at the same time permitting adequate head-bearing area...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
.... Bearing-Load Ratings Bearing-load ratings are based on results of laboratory rolling-contact fatigue tests that have been conducted under conditions as near ideal as possible. Any departure from these reasonably ideal conditions, such as misalignment, vibration, shock loading, insufficient...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001723
EISBN: 978-1-62708-221-1
... marked. Fig. 3 Case “A” This crane, which was in new condition, failed during the overload test following erection. A test load of 18 3 4 tons had been lifted successfully at 39 ft. 6 in. radius (rated capacity 15 tons) and slewed through 300°. The test load of 5 tons at the end...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006805
EISBN: 978-1-62708-329-4
... the result of cracks in untempered martensite that formed as a result of overheating during finish grinding. The shape and size of the head-to-shank fillet also have an important influence on fatigue performance. In general, the radius of this fillet should be as large as possible while at the same time...
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
... for that situation can be produced, and all dynamic variables can be determined. However, if only one variable is given (e.g., S a or S max ), there is insufficient information to tell what the test conditions were, and the data are virtually useless. In many cases, insufficient information is available...