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crack-tip plasticity

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Image
Published: 01 January 2002
Fig. 57 The plastic stretched zone at the tip of a macroscale crack. Source: Ref 28 More
Image
Published: 15 January 2021
Fig. 67 Plastic stretched zone at the tip of a macroscale crack. Source: Ref 5 More
Image
Published: 15 May 2022
Fig. 7 Micrographs of a plastic zone shape ahead of the crack tip in both brittle and ductile regimes under fatigue mode in (a) optical, (b) scanning electron, and (c) polarized light. Source: Ref 64 More
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: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006910
EISBN: 978-1-62708-395-9
... being required for crack propagation. Hence, in any mechanical test, the energy measured to propagate a crack consists of the surface energy of the crack, the energy of plastic deformation at the crack tip, and the energy of inelastic deformation of the entire specimen ( Ref 3 ). Because the latter two...
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
... Abstract This article reviews generalized test methodologies for fatigue characterization of polymers and examines fatigue fracture mechanisms in different engineering plastics. It provides detailed micromechanistic images of crack-tip processes for a variety of semicrystalline and amorphous...
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
... 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...
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
... Abstract Optimized modeling of fracture-critical structural components and connections requires the application of elastic-plastic fracture mechanics. Such applications, however, can require sophisticated analytical techniques such as crack tip opening displacement (CTOD), failure assessment...
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
Image
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
Image
Published: 01 January 2002
Fig. 9 Crack-tip opening displacement (CTOD) toughness, HSLA 50. δ, CTOD; δ c , CTOD fracture toughness, no significant stable crack extension, unstable fracture; δ e , elastic component of CTOD; δ m , CTOD fracture toughness, significant stable crack extension, plastic collapse; δ p , plastic More
Image
Published: 01 January 2002
. 1, wear of matrix by plowing, cracking, cutting as a result of plastic deformation; 2, wear thinning of fiber or tip resulting in elliptical, well-polished tip; 3, matrix cracking; 4, edge delamination and fiber fibrillation; 5, fiber cracking; 6, pulverized fiber wear debris; 7, deterioration More
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006926
EISBN: 978-1-62708-395-9
... failure of PC was studied in various liquid environments. It was found that the craze growth rate at the crack tip decreased, and that crack growth and dissolution became more important as the difference between the solubility parameters of the plastic and the solvent approached zero ( Ref 35...
Image
Published: 01 June 2019
Fig. 2 The crack in each web terminated in a plastic hinge. Note paint flaking in area at tip of crack. More
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001081
EISBN: 978-1-62708-214-3
... engine operation. In cracked bolt hole sections, considerable crack tip branching was observed in several cases ( Fig. 9 ). The reasons for this behavior were not clear. Fig. 9 Crack-tip branching of bolt hole crack. Plastic replicas were prepared from crack-tip locations of the etched bolt...
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 Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001766
EISBN: 978-1-62708-241-9
... for a situation where the crack tip stress intensity will increase by virtue of both crack extension and exposure of the crack tip to a rising far-field stress. A contour plot of FEA results combining the cracked geometry with the residual and applied stress profile is shown in Fig. 10 . This stress distribution...
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
... into a crack. Fig. 16 Crack formation from a craze Crack initiation is then followed by crack growth in which more craze fibrils undergo extensive plastic deformation until they rupture. At the same time, craze growth continues, and new craze matter is generated at the craze tip. When the crack...