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plastic flow

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040051
EISBN: 978-1-62708-300-3
.... It then explains how to determine the onset of yielding, which corresponds to the start of plastic deformation and the flow of metal within the workpiece. The chapter then goes on to present two important yield criteria, one based on shear stress (Tresca criterion), the other on distortion energy (von Mises...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400053
EISBN: 978-1-62708-316-4
... 1 , J 2 , and J 3 are the deviatoric stress invariants. Among the invariants, the second invariant, J 2 , is widely used in theory of plasticity to describe yielding of the material. 5.5 Isotropic Yield Criteria (Flow Criteria) Yield criteria define the condition for the limit...
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Published: 01 August 2005
Fig. 12 (a) Damage involving both plastic flow and destructive pitting on teeth of a carburized AMS 6260 steel gear. (b) Etched end face of the gear, showing excessive stock removal from drive faces of teeth More
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Published: 01 March 2006
Fig. 10.38 Fatigue crack tip advance by plastic flow proposed by Tomkins ( Ref 10.37 ) and Tomkins and Biggs ( Ref 10.38 ) More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400033
EISBN: 978-1-62708-316-4
... and use of forming limit curves and the extensive amount of information they provide. anisotropy flow stress formability forming limit curves plastic deformation sheet forming tensile test WHEN A MATERIAL is deformed, two types of deformation occur: elastic and plastic. The elastic phase...
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Published: 01 August 2005
Fig. 1.3 Schematic idealized flow curves (a) Rigid–perfectly plastic material. (b) Perfectly plastic material with an elastic region. (c) Piecewise linear (strain-hardening) material. (d) Typical of engineering alloys More
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Published: 01 August 2012
Fig. 4.13 Some of the flow curve equations used in plastic deformation studies ( Ref 4.3 ) More
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Published: 01 January 2015
Fig. 18.17 Flow stresses at various plastic strains, determined during compression testing, as a function of carbon content in quenched 41xx steels tempered at 150 °C (300 °F). The elastic limits were determined by strain gage measurements in specimens tempered at 200 °C (390 °F). Source: Ref More
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Published: 01 December 2006
Fig. 3.6 Split billet for visio-plastic study of material flow More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870157
EISBN: 978-1-62708-344-7
... with a review of the basic approach to treating low-cycle fatigue in bending, explaining that the assumption that stress is proportional to strain is incorrect due to plastic flow, causing considerable discrepancy between measured and calculated stresses. Data plots of the axial and bending fatigue...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030148
EISBN: 978-1-62708-282-2
... damage, and reviews hydrogen degradation in specific ferrous and nonferrous alloys. The preeminent theories for hydrogen damage are based on pressure, surface adsorption, decohesion, enhanced plastic flow, hydrogen attack, and hydride formation. The specific alloys covered are iron-base, nickel, aluminum...
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Published: 01 March 2006
Fig. A.41 Common types of tensile stress-strain curves showing early regions of plastic flow. (a) Upper and lower yield point. (b) Gradual yielding and strain hardening More
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Published: 01 July 2009
Fig. 2.1 Simple classifications of fracture mechanisms. (a) Low-temperature fracture mechanisms ( T ≤ 0.3 T M in absolute temperature), where plastic flow does not depend strongly on temperature or time. (b) Mechanisms of creep leading to rupture at high-temperature fracture ( T ≥ 0.3 T More
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Published: 01 November 2011
Fig. 6.1 Sequence of metallurgical stages in the diffusion bonding process. (a) Initial contact: limited to a few asperities (room temperature). (b) First stage: deformation of surface asperities by plastic flow and creep. (c) Second stage: grain-boundary diffusion of atoms to the voids More
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Published: 01 September 2005
suggest that a small amount of plastic flow occurred under the applied load. Original magnification at ~4× More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870237
EISBN: 978-1-62708-344-7
...: Ref 10.34 Fig. 10.37 Alternate shear mechanism of crack tip advance for air and vacuum proposed by Pelloux ( Ref 10.35 , 10.36 ) Fig. 10.38 Fatigue crack tip advance by plastic flow proposed by Tomkins ( Ref 10.37 ) and Tomkins and Biggs ( Ref 10.38 ) Fig. 10.39...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860237
EISBN: 978-1-62708-348-5
... and flow Arsenault (1975) Conrad ( 1960 , 1964 ) Cottrell (1956) Li (1968) McLean (1962) Nix and Menezes (1970) Peckner (1964) Reed-Hill (1964) Tegart (1966) Tien and Ansell (1966) Weertman and Weertman (1965) § 7.2.1 Basic mechanism of plastic...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240201
EISBN: 978-1-62708-251-8
...-strain curve, also known as the flow curve, should be used. The true stress-strain curve is based on the actual dimensions of the test specimen as it undergoes plastic deformation and has the shape shown in Fig. 12.11 . The true stress, σ, is defined as: (Eq 12.10) σ   =   P...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140039
EISBN: 978-1-62708-264-8
... that the diameter of the bar at the fracture surface of a brittle failure remains close to its original value, while that of the ductile failure is reduced. This reduction in diameter by plastic flow near the fracture surface is referred to as necking, and it develops in ductile metals just before fracture...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610025
EISBN: 978-1-62708-303-4
..., particularly annealed low-carbon steel, show a localized heterogeneous type of transition from elastic to plastic deformation that produces a definite yield point in the stress-strain curve. Rather than having a flow curve with a gradual transition from elastic to plastic behavior, metals with a yield point...