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linear elastic fracture mechanics

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Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003530
EISBN: 978-1-62708-180-1
... of fracture mechanics. The fracture mechanics approach is an important part of stress analysis at the tips of sharp cracks or discontinuities. The article reviews fracture mechanics concepts, including linear elastic fracture mechanics, elastic-plastic fracture mechanics, and subcritical fracture mechanics...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006767
EISBN: 978-1-62708-295-2
... mechanics analysis linear elastic fracture mechanics analysis stress analysis equations stress analysis THE STRESSES acting on a component may cause unacceptable deformation, cracking, or fracture. By definition, after a stress-related failure has occurred, it is a given that the stresses reached...
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
.... The pre-existing crack morphology was intergranular fracture in the axles studied. An estimate of the force required to cause the axle fracture can be made using the measured crack size, fracture toughness determined from these tests, and linear elastic fracture mechanics. The axle can be reliably said...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003513
EISBN: 978-1-62708-180-1
... δ e δ mat FAD, failure assessment diagram; LEFM, linear elastic fracture mechanics; EPFM, elastic-plastic fracture mechanics; CTOD, crack-tip opening displacement; FAC, failure assessment curve; FAP, failure assessment point; J e , elastic component of J -integral; J p...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001140
EISBN: 978-1-62708-227-3
...) situation. Proper employment of LEFM (linear elastic fracture mechanics) based failure criterion can provide guidelines for design and material selection which would ensure desirable course of events, i.e., “leak before break”. This was originally done in 1963 by Irwin [ 1 ] who have proposed the LBB...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.9781627081801
EISBN: 978-1-62708-180-1
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003541
EISBN: 978-1-62708-180-1
... or arrested. These markings are commonly called crack arrest lines or rib markings because of their resemblance to curved rib bones. Figure 23 shows the fracture surface area in a PE natural gas pipe where the crack has stopped. As previously stated, cracking is a stress-relief mechanism. Elastic strain...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003512
EISBN: 978-1-62708-180-1
... fracture resulted in the release of the molasses in the tank similar to the Boston Molasses tank disaster in 1919. Fig. 3 A general plot of the ratios of the toughness and stress showing the relationship between linear elastic fracture mechanics and strength of materials as it relates to fracture...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006802
EISBN: 978-1-62708-329-4
..., and the corrosion resistance of materials. These are briefly discussed in this section. Strength of Materials Linear Elastic Fracture Mechanics Damage-Tolerance Approach Elevated-Temperature Concern Corrosion Allowances With the advent of strict quality-assurance controls and nondestructive...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001636
EISBN: 978-1-62708-217-4
..., the topics and techniques, and the results. There follows a discussion of how fractographic data from the service failure and full-scale and specimen fatigue test failures, combined with linear elastic fracture mechanics, led to estimates of certain service fatigue stresses. These estimates indicated...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001028
EISBN: 978-1-62708-214-3
..., the reader is referred to any text covering linear elastic fracture mechanics, such as Ref 1 or 2 . Most Probable Cause Remedial Action Oil tanks with a capacity of 15 L (4 gal) fabricated from type 321 stainless steel sheet are used in the lubrication subsystem of a large commercial helicopter...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001790
EISBN: 978-1-62708-241-9
... be made, using fundamental linear elastic fracture mechanics: (Eq 2) Δ σ failure = Δ K ss f g π a where f g is the crack growth geometry factor (including angular orientation along the crack front), [ 4 , 5 ] and a is the crack depth at which the striation spacing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001706
EISBN: 978-1-62708-217-4
... that are sensitive to the presence of minute surface cracks. Earlier in 1998, QETE conducted a linear elastic fracture mechanics (LEFM) analysis to calculate the critical size of a surface defect that would lead to catastrophic SCC failure of the 4340 steel MLG beam ( Ref. 1 ). The critical SCC crack size...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001275
EISBN: 978-1-62708-215-0
... for this material using fatigue precracked specimens. Since the field failure occurred with little bulk yielding around the crack tip, an equivalent K IC can be found from the measured J IC and linear elastic fracture mechanics used for failure prediction. An equivalent plane strain K IC is defined...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003528
EISBN: 978-1-62708-180-1
... and residual-stress-free Ti-6Al-4V specimen. Source: Ref 35 When applying linear elastic fracture mechanics, the residual-stress contributions to the stress-intensity factor can be calculated and used to predict whether crack growth and/or arrest occurs. It should be noted that the effect of residual...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006768
EISBN: 978-1-62708-295-2
... ). Fig. 12 Effect of tensile residual stress (RS) on fracture loads as a function of test temperature. Source: Ref 43 Fig. 13 Crack-tip opening of a shot-peened and residual-stress-free Ti-6Al-4V specimen. Source: Ref 44 When applying linear elastic fracture mechanics, the residual...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001606
EISBN: 978-1-62708-226-6
... by the implant. After several weeks or months, the fixation implant is usually surgically removed, because the presence of the higher-elastic-modulus metal support may hinder the repaired bone development if it is retained in place. From the mechanical/metallurgical perspective, in addition to the basic...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006819
EISBN: 978-1-62708-329-4
.... The article reviews fatigue assessment methods incorporated in international design and post construction codes and standards, with special emphasis on evaluating welds. Specifically, the stress-life approach, the strain-life approach, and the fracture mechanics (crack growth) approach are described...
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
... field at the crack tip in terms of stress intensity ( K ) in linear elastic fracture mechanics. The crack-tip stress-intensity factor, K , uniquely characterizes the elastic stress field near a crack and represents the crack driving force that controls the onset of brittle fracture and the rate...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
...-Integral Approach to Elastic-Plastic Fatigue Crack Growth , Cracks and Fracture , STP 601, American Society for Testing and Materials , 1976 , p 19 – 32 18. Saxena A. , Nonlinear Fracture Mechanics for Engineers , CRC Press , 1998 19. Tada H. , Paris P.C. , and Irwin...