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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.aero.c9001605
EISBN: 978-1-62708-217-4
... at the tips of the cracks were evaluated using electron micrograph stereo image pairs to characterize local fracture toughness. To complete the failure analysis, nondestructive evaluation, metallographic examination, and chemical investigations were carried out. No secondary cracks could be found. Most...
Abstract
After a quick-release fitting of an ejection seat broke, an investigation was performed to determine the manner and cause of crack propagation. Most fractography-based investigations aim to characterize only qualitative characteristics, such as the fracture orientation and origin position, topology, and details of interactions with microstructural features. The aim of this investigation was to use quantitative fractography as a tool to extract information, including striation spacing and size of the stretched zone, in order to make a direct correlation with fracture mechanic concepts. As the crack propagated, striations were created on the fracture surface as a result of service-induced load changes. The size of the striations were measured to estimate crack propagation rate. Remaining lifetime estimates were also made. The dimensions of plastically stretched zones found at the tips of the cracks were evaluated using electron micrograph stereo image pairs to characterize local fracture toughness. To complete the failure analysis, nondestructive evaluation, metallographic examination, and chemical investigations were carried out. No secondary cracks could be found. Most of the broken parts showed that the microstructure, the hardness, and the chemical composition of the Al-alloy were within the specification, but some of the cracked parts were manufactured using a different material than that specified.
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Published: 01 December 1992
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Published: 01 January 2002
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in Elevated-Temperature Life Assessment for Turbine Components, Piping, and Tubing
> Failure Analysis and Prevention
Published: 01 January 2002
Fig. 7 Plot showing the effect of temper embrittlement on the fracture toughness of a 1CrMoV steel. Source: Ref 8
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Published: 01 January 2002
Fig. 23 Effect of thickness on state of stress and fracture toughness at the crack tip. Source: Ref 5
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Published: 01 January 2002
Fig. 13 Schematic of variation in fracture toughness and macro-scale features of fracture surfaces for an inherently ductile material. As section thickness ( B ) or preexisting crack length ( a ) increases, plane strain conditions develop first along the centerline and result in a flat
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Published: 01 January 2002
Fig. 55 Correlation of shear lip width with fracture toughness. The depth of the shear lip ( D ) is related to the plane-stress plastic zone size and then to the fracture toughness. See text for discussion Source: Ref 25
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in Mechanisms and Appearances of Ductile and Brittle Fracture in Metals
> Failure Analysis and Prevention
Published: 01 January 2002
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in Failure Modes and Materials Performance of Railway Wheels
> ASM Failure Analysis Case Histories: Rail and Rolling Stock
Published: 01 June 2019
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Published: 01 June 2019
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Published: 15 January 2021
Fig. 23 Effect of thickness on state of stress and fracture toughness at the crack tip. Source: Ref 5
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Published: 15 January 2021
Fig. 14 Schematic of variation in fracture toughness and macroscale features of fracture surfaces for an inherently ductile material. As section thickness ( B ) or preexisting crack length ( a ) increases, plane-strain conditions develop first along the centerline and result in a flat fracture
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Published: 15 January 2021
Fig. 65 Correlation of shear lip width with fracture toughness. The depth of the shear lip ( D ) is related to the plane-stress plastic zone size and then to the fracture toughness. See text for discussion. Source: Ref 2
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Published: 15 January 2021
Fig. 66 Correlation between stretch-zone width (SZW, or δ) and fracture toughness normalized by the elastic modulus, E . Source: Ref 2
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in Mechanisms and Appearances of Ductile and Brittle Fracture in Metals
> Failure Analysis and Prevention
Published: 15 January 2021
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in An Investigative Analysis of the Properties of Severely Segregated A441 Bridge Steel
> ASM Failure Analysis Case Histories: Buildings, Bridges, and Infrastructure
Published: 01 June 2019
Fig. 5 Dynamic fracture toughness date plotted versus temperature for banded and non-banded cores.
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in Failure of Non-Magnetic Retaining Ring in a High-Speed Generator Rotor
> Handbook of Case Histories in Failure Analysis
Published: 01 December 1993
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Published: 15 May 2022
Fig. 8 Variation of apparent fracture toughness, K Q , with temperature for toughened thermoplastics for 6.4 mm (0.25 in.) thick specimens. This illustrates changes in fracture mode from a fully ductile (upper shelf energy) to a fully brittle (lower shelf energy).
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Published: 15 May 2022
Fig. 28 Apparent fracture toughness ( K Q ) as a function of temperature. 6.4 mm (0.25 in.) thick specimens
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Published: 15 May 2022
Fig. 36 Loading-rate dependence of fracture toughness. FBA, force-based analysis; DKC, dynamic key curve; POM, polyoxymethylene
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