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unstable crack propagation

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Published: 01 January 1996
Fig. 8 Gross section stress at initiation of unstable crack propagation vs. crack length for wide sheet panels of four aluminum alloy/temper combinations. Source: Ref 13 More
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Published: 15 June 2019
Fig. 19 Gross section stress at initiation of unstable crack propagation vs. crack length for wide sheet panels of four aluminum alloy/temper combinations. Fty, specified tensile yield strength. Source: Ref 43 More
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Published: 01 January 1996
Fig. 11 Intergranular fracture in case unstable crack propagation zone in gas-carburized and direct-cooled SAE 4320 steel. Courtesy of A. Reguly More
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002400
EISBN: 978-1-62708-193-1
... in carburized steels. The stages of fatigue and fracture of the steels, namely crack initiation, stable crack propagation, and unstable crack propagation, are reviewed. The article analyzes the intergranular fracture at the prior-austenite grain boundaries of high-carbon case microstructures that dominates...
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Published: 01 January 2000
Fig. 12 Load vs. time record showing the definitions of the various load points used in various models to estimate the percent shear fracture; P GY , characteristic value for onset of plastic deformation; P M , maximum load; P IU , load at the initiation of unstable crack propagation; P More
Image
Published: 01 January 1996
Fig. 8 Fatigue fracture in gas-carburized and modified 4320 steel. (a) Overview of initiation, stable crack propagation, and unstable crack propagation. (b) Same area as shown in (a), but with extent of stable crack indicated by dashed line. (c) Higher magnification of intergranular initiation More
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Published: 15 January 2021
Fig. 8 Fatigue fracture in gas-carburized and modified 4320 steel showing overview of initiation, stable crack propagation, and unstable crack propagation, with extent of stable crack indicated by dashed line More
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Published: 01 January 2002
Fig. 8 Fatigue fracture in gas-carburized and modified 4320 steel showing overview of initiation, stable crack propagation, and unstable crack propagation, with extent of stable crack indicated by dashed line More
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Published: 15 May 2022
be great enough for long cracks to be able to propagate. The second region, represented by the solid middle line, is the Paris regime, where stable crack growth occurs. Finally, the third region, represented by the dashed line to the right, is the unstable crack-growth regime dictated by fast fracture More
Series: ASM Handbook
Volume: 2B
Publisher: ASM International
Published: 15 June 2019
DOI: 10.31399/asm.hb.v02b.a0006457
EISBN: 978-1-62708-210-5
.... These methods can also help identify the likely areas of stress concentration where cracking may have initiated. Traditional methods of stress analyses do not easily account for crack propagation from preexisting cracks or sharp discontinuities in the material. Basic elasticity calculations show that both...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002384
EISBN: 978-1-62708-193-1
... shown in Fig. 4 . The concept of arresting a propagating crack is also introduced. In certain industries, designing-in the ability to arrest a running crack can prevent serious consequences or reduce the amount of damage. Fig. 4 Schematic representation of the conditions for stable and unstable...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003305
EISBN: 978-1-62708-176-4
..., the crack initiates in a cleavage mode from the tip of the fatigue crack. In region II s , the fracture toughness to initiate unstable crack propagation increases with increasing temperature. This increase in crack-initiation toughness corresponds to an increase in the size of the plastic zone...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003306
EISBN: 978-1-62708-176-4
.... Fracture toughness is defined as resistance to the propagation of a crack. This propagation is often thought to be unstable, resulting in a complete separation of the component into two or more pieces. Actually, the fracture event can be stable or unstable. With unstable crack extension, often associated...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002380
EISBN: 978-1-62708-193-1
... and the parameters used to describe it are discussed. Fracture toughness is defined as resistance to the propagation of a crack. This propagation is often thought to be unstable, resulting in a complete separation of the component into two or more pieces. Actually, the fracture event can be stable or unstable...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003540
EISBN: 978-1-62708-180-1
... initiate by IG cracking, but also the unstable crack propagates largely by IG fracture until it reaches the lower-carbon portion of the case, where ductile fracture by microvoid coalescence becomes the dominant fracture mode. In fact, sensitivity of the case microstructures to IG fracture makes possible...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006940
EISBN: 978-1-62708-395-9
... asymptotic value at K = K c , where a transition from a stable (region II) to an unstable condition and a very rapid crack-propagation rate occurs. Because polymers are viscoelastic materials, plastic flow is commonly observed when they are fatigued at greater levels of strain. At moderate strain...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000613
EISBN: 978-1-62708-181-8
..., 520×. Fig. 755 : Quasi-cleavage topography of small and poorly defined cleavage facets, connected by shallow dimples, marks change from relatively slow intergranular cracking to more rapid, unstable crack propagation. SEM, 520× (C.R. Brooks, University of Tennessee, and D. Huang, Fuxin Mining...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003543
EISBN: 978-1-62708-180-1
... a level of ductile behavior; otherwise, once a crack is initiated it would result in instant unstable crack growth, fracturing in a macroscopic brittle manner. Unlike ductile overload, however, fatigue most often initiates and propagates at overall stresses below the yield stress. Dimple-rupture...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003720
EISBN: 978-1-62708-177-1
... or unstable crack propagation can also occur in a cylindrical section. This radial pattern, sometimes called a radial shear, star, or rosette, is perpendicular to the crack front and, as such, may be considered to be the round-sample equivalent of the radial markings or chevron patterns that appear on sheet...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003311
EISBN: 978-1-62708-176-4
... a critical energy release rate or a critical stress intensity factor. The critical value is the value of G or K at the instant when unstable crack extension occurs, that is, when the crack propagates through the specimen and thus causes the specimen to break in two. The critical energy release rate, G...