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fracture mechanic crack growth

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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
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006790
EISBN: 978-1-62708-295-2
...Abstract Abstract Engineered components fail predominantly in four major ways: fracture, corrosion, wear, and undesirable deformation (i.e., distortion). Typical fracture mechanisms feature rapid crack growth by ductile or brittle cracking; more progressive (subcritical) forms involve crack...
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
... for 15 years. Pertinent Specifications Specimen Selection Surface Examination Metallography Chemical Analysis/Identification Mechanical Properties The fracture morphologies of laboratory-tested creep crack growth and fracture toughness test specimens were found to be similar...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001383
EISBN: 978-1-62708-215-0
... in the fracture mechanism. This fracture mode occurred across the entire cross-section of the stud in the slow crack growth region. Figures 3 and 4 show characteristic fractographs typical of the failed studs examined in the SEM. Regions of corrosion were chemically analyzed using energy dispersive...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001537
EISBN: 978-1-62708-234-1
.... Rather, it merely assisted crack growth by the stress corrosion mechanism. Region 4, which covered 50% of the fracture area, developed mainly by stress corrosion. This zone gradually changed into the combination of intergranular and transgranular overload in Region 5, which covered approximately...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001531
EISBN: 978-1-62708-231-0
... metallography technology. The composition of inclusions in crack initiation sites was analyzed by x-ray energy dispersive spectrum analysis in the SEM. The static mechanical properties (strength and plasticity) were measured using smooth samples of 10 mm diameter and 50 mm gauge length. The static fracture...
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
... elastic fracture mechanics analysis, with some mention of elastic-plastic fracture mechanics analysis. The article describes the probabilistic aspects of fatigue and fracture. Information on crack-growth simulation of the material is also provided. crack-growth simulation elastic-plastic fracture...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006777
EISBN: 978-1-62708-295-2
... of crack growth. The article describes in more detail some typical mechanisms that cause IG fracture. It discusses the causes and effects of IG brittle cracking, dimpled IG fracture, IG fatigue, hydrogen embrittlement, and IG stress-corrosion cracking. The article presents a case history on IG fracture...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001024
EISBN: 978-1-62708-214-3
..., hollow 6061-T651 aluminum alloy extrusion and 26 fiberglass “pockets” that provided the trailing-edge airfoil shape. Visual examination of the fracture surface of the aluminum extrusion indicated fatigue crack growth followed by ductile overload separation. Examination of the fatigue fracture region...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001011
EISBN: 978-1-62708-229-7
... sequence of failure involved overheating of the Cr-Mo outlet tubes, heavy oxidation, oxide cracking on thermal cycling, thermal fatigue cracking plus oxidation, creep-controlled crack growth, and rapid plastic deformation and rupture. This failure was indicative of excess temperature of the steam coming...
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
... in continued, quite variable, local crack growth rates and locally unstable crack growth. Fracture mechanics calculations clearly indicate that there was nearly sufficient loading available from known sources to grow flaws of the type introduced by squeeze clamping to the dimensions of the apparent...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0089572
EISBN: 978-1-62708-218-1
.... Investigation (visual inspection, chemical analysis, tensile testing, unetched 65x and 1% nital etched 65x magnification) supported the conclusions that the steel was too soft for the application – probably due to improper heat treatment. Fracture of the equalizer beams resulted from growth of mechanical cracks...
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
... alleviated the problem of slow, high cycle fatigue crack growth, at normal operating stresses in similar fans. Bending fatigue Centrifugal blowers Electric power generation Weld defects Low-carbon steel Fatigue fracture Joining-related failures Introduction Material Testing Fractographic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001717
EISBN: 978-1-62708-217-4
... surface of the component was subsequently examined using the scanning electron microscope (SEM) in order to determine the fracture morphology and fracture mechanism. The fracture surface was approximately 50% intergranular (the primary crack comprised 20%, while the secondary crack was 30...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006776
EISBN: 978-1-62708-295-2
... of transition from flat (tensile mode) fatigue crack propagation to growth on a slant plane (shear mode). Propagation on a slant plane can occur in relatively thin, tough materials at high growth rates. Source: Ref 14 Fig. 13 Aluminum alloy fracture mechanics test specimen, 6.3 mm (0.25 in.) thick...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003539
EISBN: 978-1-62708-180-1
... to growth on a slant plane (shear mode). Propagation on a slant plane can occur in relatively thin, tough materials at high growth rates. Source: Ref 14 Fig. 13 Aluminum alloy fracture mechanics test specimen, 6.3 mm (0.25 in.) thick. Fatigue crack at left of arrows is flat and perpendicular...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003537
EISBN: 978-1-62708-180-1
... and Appearances Microscopic examination can help identity imperfections that initiate cracking, the path of fracture (intergranular or transgranular), and the microscale mechanisms of cracking (i.e., microvoid coalescence, cleavage, or fatigue). Localized directions of crack growth also can be determined...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006774
EISBN: 978-1-62708-295-2
... Striation Spacing Fatigue Crack Growth Rates Fatigue Crack Growth Rates at Intermediate Δ<italic>K</italic> Values Crack Blunting and Stretch Zones Plane-Strain (Linear Elastic) Conditions Fracture Mechanics of Crack Growth (Monotonic Loads) Calculation Based on Shear Lip Width Appendix...
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
... of subcritical crack growth in structures. Its magnitude depends on the applied nominal stress, geometry, and the crack size. Fracture mechanics methods are thus used to determine the crack-growth rates of pre-existing cracks under cyclic loading, where the subcritical crack growth from fatigue loading, da / dN...
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
... in regions of high stresses and strains, the subsequent crack growth mechanisms, and final fracture. They have also contributed to the optimization of materials, manufacturing, and component design as well as to the conduction of a proper failure analysis. Methods and material characteristics for fatigue...