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Fracture toughness

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001196
EISBN: 978-1-62708-224-2
... Abstract A forged alloy steel arm of a lifting fork with an approximate cross section of 150 x 240 mm (5.92 x 9.45 in.) fractured after only a short service life on a lift truck. The fracture surface had the appearance of a fracture originating from a surface crack. Analysis (visual inspection...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001272
EISBN: 978-1-62708-215-0
... Fracture mechanics Fracture toughness Galvanized steels Mechanical properties Stresses Tanks ASTM A446 grade B ASTM A446 grade F Brittle fracture A large grain bin failed cataclysmically soon after erection ( Fig. 1 , 2 ). Failure occurred while the bin was in the static loaded...
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
... impact toughness. It also appears that the joint design was constrained and that the intersection of the spiral and girth welds acted as a stress raiser. In addition, welding produced high residual stresses. These factors produced a brittle, catastrophic fast fracture. The failed pipe was part of...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001128
EISBN: 978-1-62708-214-3
... Abstract Creep crack growth and fracture toughness tests were performed using test material machined from a seam welded ASTM A-155-66 class 1 (2.25Cr-1Mo) steel steam pipe that had been in service for 15 years. The fracture morphology was examined using SEM fractography. Dimpled fracture was...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001111
EISBN: 978-1-62708-214-3
... and arrested 100 mm (4 in.) down the slant web. Failure analysis revealed a major deficiency in fracture toughness. The failure occurred as a brittle fracture after the formation of a welding hot crack and approximately 40 mm (1 1 2 in.) of slow crack growth. It was recommended that bridges...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001114
EISBN: 978-1-62708-214-3
... excessive cooling rate. The failure propagated in the base material, which had low toughness and thus low crack resistance. Chevron marks, such as those on the fracture surface, generally are associated with unstable, rapid crack propagation. Conditions favoring this type of failure are low service...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001126
EISBN: 978-1-62708-214-3
... classified as tempered glass or heat-strengthened glass, the compressive stresses at the edge of the glass must be at least 67 or 38 MPa (9700 or 5500 psi), respectively. The fracture toughness ( K Ic ) of soda-lime glass is reported to be approximately 0.75 MPa m (0.68ksi in...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001372
EISBN: 978-1-62708-215-0
... 14 37 13.3 9.8 287–328 4 … … … … … … 15.8 11.6 287–328 Condition “H” (ASTM A582) … … … … … … … … 293–352 Improper heat treatment during manufacture of the coupling resulted in a structure with inadequate fracture toughness and increased susceptibility to corrosion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001515
EISBN: 978-1-62708-229-7
... isotope concentration at the outlet end of the Bruce 2 N06 pressure tube, with corresponding solvus temperatures. Fracture toughness and tensile properties were measured to estimate the critical crack length for comparison with the extent of stable crack growth observed, and to provide insight into...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001025
EISBN: 978-1-62708-214-3
... fracture mechanics, the critical crack size measured on the fractured wheel, and published fracture toughness data for 2014-T6, a maximum tensile stress of 30 MPa (4.5 ksi) was estimated for the wheel at the time of fracture. To verify this stress level, fatigue striation spacings on the fracture surface...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001020
EISBN: 978-1-62708-214-3
...-corrosion cracks developed along the hole surface and propagated into the aluminum lugs (in a direction radially outward from the steel pin), these multiple crack fronts constituted buried flaws of high stress intensity within a material of questionable fracture toughness. With this condition at this...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001071
EISBN: 978-1-62708-214-3
... sulfate deposits at A and B. The tests discussed in this case history were performed to determine the mode of failure, the mechanism of failure, and the causal factors. Mechanical testing of samples from the valve body indicated that impact values and therefore fracture toughness were...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001347
EISBN: 978-1-62708-215-0
... stiffening rings or endcaps. In the case of a cylindrical vessel with endcaps and an intersecting nozzle in the middle, the nozzle is typically the source of the axial breach initiation. The number of fragments is dictated by fracture toughness or ductility of the material and the number of attachments or...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0089676
EISBN: 978-1-62708-224-2
.... Blooms Brittle fracture Chain links Overheating Reheating 2%Cr austenitic manganese steel Brittle fracture Casting-related failures The chain link shown in Fig. 1(a) , a part of a mechanism for transferring hot or cold steel blooms into and out of a reheating furnace, broke after...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001026
EISBN: 978-1-62708-214-3
... below yield—as calculated in the section “Stress Analysis.” The cleavage morphology of the overload fracture regions in this part might cause concern that the material was deficient in ductility and toughness. However, this kind of behavior is not unusual in 174PH stainless steel that meets all...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001762
EISBN: 978-1-62708-241-9
... directly on the axles. This article provides a fractography/fracture mechanic approach to making the determination of when the axle failed. Full scale tests on axle assemblies and suspensions provided data for fracture toughness in the induction hardened outer case on the axle. These tests also...
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
... propagation rates, fracture toughness, notch toughness, and transverse tensile properties, and do so in an anisotropic manner with respect to rolling direction. Significant property anisotropy has been documented in the failures investigated, providing evidence that designers failed to account for it. Typical...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001079
EISBN: 978-1-62708-214-3
... actual mechanical properties and to determine the metallurgical cause of the observed indications. Samples were examined in a scanning electron microscope and subjected to chemical analysis and several mechanical property tests, including tensile, Charpy V-notch impact, and fracture toughness. The...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001136
EISBN: 978-1-62708-229-7
... Abstract A fracture mechanics based failure analysis and life prediction of a large centrifugal fan made from low-carbon, medium-strength steel was undertaken following shortcomings in attempts to explain its fatigue life from start stop cycles alone. Measurements of the fracture toughness and...
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
... distribution of the residual stresses, which, aided by low fracture toughness due to the poor quality of the beam, resulted in failure. It was recommended that segregation be avoided in cast ingots used for I-beam manufacture by implementing a better quality-control procedure. Segregations IS-226...