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plastic blunting

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Published: 01 January 2002
Fig. 67 A model for crack-tip blunting. As yield occurs in front of an initially sharp crack, the crack-tip radius increases, a plastic zone is created in front of the blunted crack, and the high elastic stresses decrease to the work-hardened flow stress. Source: Ref 77 More
Image
Published: 15 January 2021
Fig. 67 Model for crack-tip blunting. As yield occurs in front of an initially sharp crack, the crack-tip radius increases, a plastic zone is created in front of the blunted crack, and the high elastic stresses decrease to the work-hardened flow stress. Source: Ref 42 More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001845
EISBN: 978-1-62708-241-9
... oxide flakes plastic blunting fractographic analysis bolt torque CuNiSi (nickel-silicon bronze alloy) UNS C64700 Introduction Nickel-silicon bronze alloys which offer good strength and conductivity [ 1 ] are widely utilized in electrification fields. Most such alloys are usually...
Image
Published: 01 January 2002
Fig. 54 Near crack-tip deformation and fracture processes. The stress singularity at the free surface of a crack is relieved by crack blunting and plastic flow or by microcracking, Shape of the plastic zone depends on the extent of strain hardening in the plastic zone. ρ, tip radius More
Image
Published: 15 January 2021
Fig. 64 Near crack-tip deformation and fracture processes. The stress singularity at the free surface of a crack is relieved by crack blunting and plastic flow or by microcracking. Shape of the plastic zone depends on the extent of strain hardening in the plastic zone. ρ, tip radius More
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006918
EISBN: 978-1-62708-395-9
... ). In linear elastic or K -based fracture, the crack tip should remain sharp during crack advance, with little to no blunting caused by yielding or viscoelastic mechanisms in front of the crack tip ( Ref 5 , 13 ). In elastic-plastic or J -based fracture, the crack tip generally blunts due to yielding...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0090947
EISBN: 978-1-62708-225-9
... was 55 HRC, which is typical for case-hardened steel. A metallographic cross section through the fracture surface is shown in Fig. 1(b) . A secondary crack has opened substantially and blunted in the ductile core. Plastic distortion of the core grain structure at the crack tip was evident. The seat wall...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006910
EISBN: 978-1-62708-395-9
... or not with J Ic . An example of a J-R curve and respective analysis according to ASTM E1820 is shown in Fig. 1 . Fig. 1 Typical J-R curve with construction blunting line and exclusion lines according to ASTM E1820. Adapted from Ref 28 With respect to plastic materials, as mentioned...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001135
EISBN: 978-1-62708-219-8
..., there was less crack tip blunting occurring with a smaller plastic zone. This includes the opening, advance and blunting of a crack tip in the loading portion of the cycle and the resharpening of the crack in the unloaded portion of the cycle. With less crack tip blunting, the stress intensity at the crack tip...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c9001393
EISBN: 978-1-62708-230-3
... at the same location, cracking in course of development was discovered during internal inspection. Microscope examination of several specimens cut to intersect a crack showed it to be typical of corrosion-fatigue; it was in the form of a broad fissure, contained oxide deposits, and the termination was blunt...
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
... crack initiation at surface pits from corrosion, cyclic loading in a corrosive environment ( stress-corrosion fatigue ) and elastic buckling. Elastic buckling may cause parts to contact, causing seizure of a rotating system, but it may also lead to plastic buckling and ultimately to fracture...
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
... ). This stress sometimes causes transverse cracking. Source: Ref 10 Even when there is significant constraint at the notch tip, a small amount of plastic tearing can occur on the plane of maximum normal stress in conjunction with crack tip blunting ( Fig. 16 ) ( Ref 11 ). Then, depending on the degree...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006775
EISBN: 978-1-62708-295-2
..., there is evidence of plastic deformation and failure by microvoid coalescence (MVC) ductile tearing. However, exceptions to this fracture progression mode have been reported. One is formation of a specimen-scale shear band (sometimes associated with void sheet formation at the microscale). One set of circumstances...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001715
EISBN: 978-1-62708-219-8
.... The blunting zone forms as the sharp crack tip in the fracture toughness specimen plastically deforms prior to crack growth. It is indicative of ductile fracture behavior at a crack tip in steel samples. The flat fracture zone, adjacent to the blunting zone and bounded by the overload region, has a projected...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003538
EISBN: 978-1-62708-180-1
... concepts. bending brittle fracture compression failure deformation ductile crack nucleation ductile fracture ductility fractography manufacturing imperfections metals microvoid coalescence notched specimen plastic flow root cause failure analysis single-crystal cleavage models specimen...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0091853
EISBN: 978-1-62708-223-5
... are higher than the yield strength of the cast iron, and these areas plastically deform under the compressive force of the quartz. The angle that the cutting edge of the particle makes with the wear surface is often referred to as the rake angle in cutting during machining operations. The plowing mechanism...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003560
EISBN: 978-1-62708-180-1
... Abstract Wear, a form of surface deterioration, is a factor in a majority of component failures. This article is primarily concerned with abrasive wear mechanisms such as plastic deformation, cutting, and fragmentation which, at their core, stem from a difference in hardness between contacting...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006919
EISBN: 978-1-62708-395-9
... Abstract This article reviews the impact response of plastic components and the various methods used to evaluate it.. It describes the effects of loading rate on polymer deformation and the influence of temperature and strain rate on failure mode. It discusses the advantages and limitations...
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
.... In gouging abrasion, the wearing surface is plastically deformed and work hardened by the abrasive forces, so that cutting and tearing of metal occurs on the work-hardened surface. Typical operations that involve gouging abrasion include crushing and primary grinding operations. The wear liners of crushing...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006941
EISBN: 978-1-62708-395-9
... Abstract This article describes the viscoelastic behavior of plastics in their solid state only, from the standpoint of the material deforming without fracturing. The consequences of viscoelasticity on the mechanical properties of plastics are described, especially in terms of time-dependencies...