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plastic collapse

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Published: 01 November 2010
Fig. 2 Idealized geometry of Hamilton's model. (a) Plastic collapse of asperities. (b) Effective final thickness of bond zone. Source: Ref 6 More
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001477
EISBN: 978-1-62708-173-3
... fracture, plastic collapse, fatigue, creep, corrosion, and buckling. This article focuses on the broad categories of these failure modes: fracture, fatigue, environmental cracking, and high-temperature creep. It also discusses the benefits of a fitness-for-service approach. brittle fracture buckling...
Image
Published: 01 January 2002
of the applied stress at design load to the applied stress at plastic collapse. Similar to the CEGB R6 curve, points beneath the curve are considered safe and points on or above the curve are considered unacceptable. More
Image
Published: 30 August 2021
ratio, which is the ratio of the applied stress at design load to the applied stress at plastic collapse. Similar to the CEGB R6 curve, points beneath the curve are considered safe, and points on or above the curve are considered unacceptable. More
Image
Published: 01 January 1996
Fig. 10 Failure assessment diagram based on the stress intensity ratio ( K r = K / K c ) and stress ratio ( S r = σ/σ fc ) where σ fc is the plastic collapse stress. General regions are shown for linear elastic fracture mechanics (LEFM) and elastic plastic fracture mechanics (EPFM). More
Image
Published: 01 January 1996
Fig. 27 Failure assessment diagram concept for assessing cracked components for brittle fracture and plastic collapse More
Image
Published: 01 January 2002
Fig. 4 Failure assessment diagram concept for assessing cracked components for brittle fracture and plastic collapse 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 1996
Fig. 3 Schematic representation of a crack growing in service under fatigue loading. Failure occurs if a f ≥ a c . a 0 , start-of-life defect size; a f , defect size due to fatigue crack growth; a c , critical defect size due to unstable fracture or plastic collapse More
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
... approach of Dowling and Townley ( Ref 11 ). The CEGB approach ( Ref 3 , 12 , 13 ) addressed post-yield fracture by an interpolation formula between two limiting cases: linear elastic fracture and plastic collapse. The interpolation formula, known as the failure assessment or R6 curve ( Fig. 1...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002383
EISBN: 978-1-62708-193-1
... to be followed for LEFM cases is reviewed in this article, along with elastic-plastic fracture mechanics (EPFM) and plastic fracture mechanics (PFM) procedures. The problem will be approached generally to show that LEFM and PFM are special cases of EPFM. Because the so-called “collapse condition” is crucial...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006823
EISBN: 978-1-62708-329-4
... is a tool that establishes the acceptability of cracklike flaws based on failure mechanisms, unstable fracture, and plastic collapse. Finally, it should be noted that while all of the analyses presented in this article are real analyses that were conducted on real failed or corroded equipment, the numbers...
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
... are: Unstable fracture (brittle or ductile) Ductile fracture Plastic collapse Buckling Fatigue Corrosion fatigue Corrosion Stress-corrosion cracking Hydrogen-induced cracking The first four modes of failure occur under static load. While brittle fracture can occur at nominal...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002386
EISBN: 978-1-62708-193-1
... conditions of plastic collapse and linear (elastic) fracture mechanics. The CEGB R6 method ( Ref 1 ) uses a failure assessment diagram ( Fig. 10 ), which plots the ratio K r = K / K c versus the ratio S r = σ/σ fc (where σ fc is the stress for plastic collapse). This normalization makes...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006384
EISBN: 978-1-62708-192-4
... hundred micrometers, whereas pit depth is on the order of a few percent of pit diameter or less ( Ref 41 ). Although pitting is observed more on ductile metallic alloys that deform plastically under the action of bubble collapse, pits can also be formed in other materials such as polymers ( Ref 40...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005512
EISBN: 978-1-62708-197-9
... in point-to-point contact ( Fig. 2 ). The asperities were thought to collapse by time-dependent plasticity (in this case, by superplastic flow) under plane-strain conditions. Fig. 2 Idealized geometry of Hamilton's model. (a) Plastic collapse of asperities. (b) Effective final thickness of bond zone...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003295
EISBN: 978-1-62708-176-4
... tension and compression testing to shear stress and shear strain; however, this conversion seldom extends into a high strain range. The limit is frequently about 20% strain, which is far less than the strains reached in the aforementioned applications. At higher plastic strains, the deviation between...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003569
EISBN: 978-1-62708-180-1
... Analysis Failure Mechanisms Cavitation erosion is material removal or plastic deformation of a solid surface in contact with a fluid subjected to cavity collapse. Shock wave and microjet result in a mechanical loading of the solid surface. In terms of contact mechanics, this type of loading could...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005606
EISBN: 978-1-62708-174-0
... and temperature to an interface for a prescribed period of time, is generally considered complete when cavities fully close at the faying surfaces. Relative agreement is found for the mechanisms and sequence of events that lead to the collapse of interface voids, and the following discussion describes...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001350
EISBN: 978-1-62708-173-3
..., that is, the application of pressure and temperature to an interface for a prescribed period of time, is generally considered complete when cavities fully close at the faying surfaces. Relative agreement is found for the mechanisms and sequence of events that lead to the collapse of interface voids, and the discussion...