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Woody fracture

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0089254
EISBN: 978-1-62708-225-9
.... One of the wedge-shaped middle rings fractured prior to having been fully torqued, preventing the sprocket from being locked to the shaft. “Woodyfracture features, as a result of decohesion between a high volume fractions of manganese sulfide stringers and the matrix, was revealed during examination...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001597
EISBN: 978-1-62708-236-5
... source of the failure and thus no continued analysis to pin down and eliminate the root cause. Continuous cast steel Induction hardening MnS inclusions Segregation Woody fracture 1548 (mod) Fatigue fracture Failure analysis has long been a special field of study for metallurgical...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001267
EISBN: 978-1-62708-215-0
... at rub marks on the inside edge of the spring. An investigation of loads encountered in service indicated that the springs had been loaded to a large fraction of the yield strength. Redesign of the spring mechanism was recommended. Springs (elastic) Woody fracture ASTM A228 UNS K08501 Fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001780
EISBN: 978-1-62708-241-9
... of this kind, viewed optically are characteristically “woody” in appearance ( Fig. 1 ). When viewed under a scanning electron microscope (SEM), the fractures exhibit separation of the manganese sulfide (MnS) inclusions from the matrix in varied and interesting morphologies ( Figs. 2 , 3 ). The question...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0089338
EISBN: 978-1-62708-224-2
...Abstract Abstract A steel lifting eye, manufactured from grade 1144 steel, failed during service. The eye ring fractured in two places, adjacent to the threaded shank and diametrically opposite to this region. Woody overload features, typical for resulfurized steels were revealed by SEM...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0006387
EISBN: 978-1-62708-217-4
... initiated on the inner walls of the fixture. Fig. 1 Opened crack (a) in aluminum alloy 7075-T651 ejection seat swivel fixture that failed by SCC. Note crack propagation markings that suggest the crack initiated on the inside wall of the fixture and woody appearance of the fracture. (b) Higher...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001800
EISBN: 978-1-62708-241-9
... ferrite grains (white) and pearlite colonies (dark), Nital etch The longitudinal fracture zones on the springs exhibited ductile microvoid dimples with a “woody” appearance ( Fig. 10 ), typical of ductile overload transverse to the rolling direction of elongated structures [ 6 ]. This is also...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001648
EISBN: 978-1-62708-234-1
... equivalent-sized pieces. Both fractures followed a longitudinal path ( Fig. 12 , 13 , 14 ) and exhibited a generally woody appearance. No evidence of localized plastic deformation or general distortion was found. In other words, both fractures took place in a macroscopically brittle manner. Careful...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006778
EISBN: 978-1-62708-295-2
.... It describes the general aspects of fracture modes and mechanisms. The article briefly reviews some mechanistic aspects of ductile and brittle crack propagation, including discussion on mixed-mode cracking. Factors associated with overload failures are discussed, and, where appropriate, preventive steps...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003501
EISBN: 978-1-62708-180-1
... in materials selection. The section “Risk Assessment in Design” briefly reviews the use of risk and hazard analysis in design. In addition to multifunctional design approaches, sophisticated design tools have been developed to assist in preventing failures. Fracture mechanics is often used to create flaw...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003500
EISBN: 978-1-62708-180-1
..., one of the wedge-shaped middle rings fractured prior to having been fully torqued, preventing the sprocket from being locked to the shaft. The failed assembly was investigated for root cause. One of the middle rings had cracked ( Fig. 10 , 12a ). Examination of the fracture revealed “woodyfracture...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006753
EISBN: 978-1-62708-295-2
... ). Indeed, examination of the fracture revealed “woodyfracture features ( Fig. 11b ) as a result of decohesion between a high volume fraction of manganese sulfide stringers and the matrix ( Fig. 12 ). The matrix fracture features showed ductile dimpled rupture. Fig. 11 (a) Crack and (b) broken-open...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003543
EISBN: 978-1-62708-180-1
...Abstract Abstract Overload failures refer to the ductile or brittle fracture of a material when stresses exceed the load-bearing capacity of a material. This article reviews some mechanistic aspects of ductile and brittle crack propagation, including a discussion on mixed-mode cracking, which...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
... and fibering Burnished surface and controlled surface quality However, the beneficial factors of deformation processing can become a potential problem if the process is not carefully understood. Potential problems of the deformation process also include: Fracture-related problems: for example...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006785
EISBN: 978-1-62708-295-2
... and transgranular cracking. The SCC fracture surfaces have also been described as having a “woody” appearance. The fracture surface may be covered in corrosion product or exhibit beach marks associated with discontinuous crack propagation ( Fig. 13 ). (Beach marks are macroscopic features on a fracture surface...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003553
EISBN: 978-1-62708-180-1
... information on specific ions and substances, service environments, and preservice environments responsible for SCC. It details the analysis of SCC failures, which include on-site examination, sampling, observation of fracture surface characteristics, macroscopic examination, microscopic examination, chemical...