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star-shaped fracture pattern

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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.c9001792
EISBN: 978-1-62708-241-9
... beach marks, suggesting rotary-bending fatigue. The fracture surfaces on the clutch shaft exhibited a star-shaped pattern, suggesting that the failure was due to torsional overload which may have initiated at corrosion pits discovered during the examination. Based on the observations, it was concluded...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0091096
EISBN: 978-1-62708-234-1
... per second. Fig. 1 4340 steel rotor shaft that failed by torsional fatigue. (a) Shear groove designed to protect gear mechanism from sudden overload. Dimensions are in inches. (b) Star-shaped pattern on a fracture surface of the shaft. (c) Longitudinal and transverse shear cracks on the surface...
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
... second. Fig. 7 4340 steel rotor shaft that failed by torsional fatigue. (a) Shear groove designed to protect gear mechanism from sudden overload. Dimensions are in inches. (b) Star-shaped pattern on a fracture surface of the shaft. (c) Longitudinal and transverse shear cracks on the surface...
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
... by torsional fatigue. (a) Shear groove designed to protect gear mechanism from sudden overload. Dimensions are in inches. (b) Star-shaped pattern on a fracture surface of the shaft. (c) Longitudinal and transverse shear cracks on the surface of the shear groove, which resulted from high peak loads caused...
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
... with part size and shape and with loading conditions. The crack origin can best be found by visual examination or by viewing the fracture surface at low magnifications (25 to 100×). Examination of fatigue fractures by optical microscopy is often difficult because the height of features on the fracture...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006779
EISBN: 978-1-62708-295-2
..., amplitude or range) Damage criteria (crack initiation, change of stiffness, fracture) Shape of spectrum for variable-amplitude loading Handling and representation of runouts Determination of fatigue limit (pearl chain, staircase, probit) Statistical evaluation and quantification of scatter...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003538
EISBN: 978-1-62708-180-1
... deformation at room temperature, where plastic strain must usually accumulate by slip prior to the onset of twinning. Twinning Deformation in Fracture Analysis Twinning deformation is of importance with respect to deformation and fracture in three ways. On one hand, the change in shape...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006775
EISBN: 978-1-62708-295-2
... deformation at room temperature, where plastic strain must usually accumulate by slip prior to the onset of twinning. Twinning Deformation in Fracture Analysis Twinning deformation is of importance with respect to deformation and fracture in three ways. The change in shape of an arbitrarily oriented...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001820
EISBN: 978-1-62708-180-1
... applied to the pipe steel, is responsible for the failure. If the fracture propagation is brittle, it is possible that the fracture appearance will be brittle from the star-burst pattern at the origin to the tearing shear fracture at the arrest. Occasionally, the fracture at the origin will be ductile...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003564
EISBN: 978-1-62708-180-1
... recent years ( Ref 3 ). A typical experiment involves pressing an indent into the surface of the solid with a progressively increasing load and observing the pattern of fracture that develops under the contact. Under a blunt indent, a well-defined cone-shaped crack pops in when the normal load reaches...
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
... into a conical shape ( Fig. 19a ) encased in a low-melting-temperature alloy. Fracture occurred at the shackle where the end of the cable was socketed. Fig. 19 Fatigue fracture of a steel 8 × 19 elevator cable. The fracture resulted from cyclic torsional and tensile stresses. (a) Conical shape at end...
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
... of the wire rope was sealed into a conical shape ( Fig. 9a ) in a low-melting alloy. Fracture occurred at the shackle where the end of the cable was socketed. Fig. 9 Fatigue fracture of a steel 8 × 19 elevator cable. The fracture resulted from cyclic torsional and tensile stresses. (a) Conical shape...
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
... occur as a number of intersecting cracks forming the shape of a star. Longitudinal crater cracks can propagate along the axis of the weld to form a centerline crack. In addition, such cracks may propagate upward through the weld if they are not removed before subsequent passes are applied. Crater...
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. 1 Example of brittle fracture of welded ship structure. SS Schenectady , which fractured at its outfitting dock, was one of 19 Liberty ships that experienced brittle cracking of the welded structure. Fig. 2 Welding and joining processes. Adapted from Ref 3 Fig. 3...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006803
EISBN: 978-1-62708-329-4
.... , Update of the Probability of Fracture (PROF) Computer Program for Aging Aircraft Risk Analysis , Modifications and User’s Guide , Vol 1 , Air Force Reserach Laboratory , 1998 8. Berens A. , interview, July 1999 9. Rackwitz R. and Fiessler B. , Structural Reliability...