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Shear bands

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560125
EISBN: 978-1-62708-291-4
... such as slip lines, dislocations, shear bands, and kinking can be detected as well as what they reveal. It also describes the structure of patented wires, cast steels, and sintered steels and the morphology of manganese sulfide inclusions in castings. References References 1. Beraha E. , J...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090333
EISBN: 978-1-62708-266-2
... strength of 2.45 to 3.92 GPa (355 to 569 ksi) and a Young’s modulus of 127 to 166 GPa (18.4 to 24.1 × 10 3 ksi) ( Ref 13.2 ). These alloys are capable of plastic deformation on shear bands, although in tension the plastic elongation to fracture is generally less than 2%. Amorphous alloys...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610055
EISBN: 978-1-62708-303-4
... planes. (a) Void sheets from propagation of a crack between widely spaced inclusions within a shear band in a 4340 steel. Stress axis is vertical. Reprinted with permission from ASTM STP600, Fractography—Microscopic Cracking Processes , copyright ASTM International, 100 Barr Harbor Drive, West...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780404
EISBN: 978-1-62708-281-5
.... Shear Bands <xref rid="t69780404-f7" ref-type="fig">(Fig. 7,</xref><xref rid="t69780404-ref4" ref-type="bibr">Ref 4)</xref> Shear bands ( Fig. 7 , Ref 4 ) are also microscopic localized deformation zones that propagate ideally along shear planes. Like crazes, shear-deformation bands, or slip lines...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270045
EISBN: 978-1-62708-301-0
... cannot be dissipated fast, adiabatic shear bands are produced in metals and can be readily recognized in their microstructure. Such shear bands have been seen in steels, copper, titanium, and aluminum alloys subjected to projectile impact and explosive fragmentation. However, formation of shear bands...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780249
EISBN: 978-1-62708-281-5
... a thermodynamic point of view ( Ref 12 ), part of the mechanical work done during cyclic loading is spent on irreversible molecular processes ( Ref 13 ), leading to microscopic deformations such as crazes, shear bands, voids, and microcracks. The other part of the mechanical work evolves as heat. Both processes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780238
EISBN: 978-1-62708-281-5
... systems, the thermal work influenced by high damping and low thermal conductivity contributes to micromechanisms of permanent deformation, including craze formation, shear bands, voids, or even microcracks ( Ref 8 ). Fig. 4 Plot showing the effect of increasing test frequency and stress amplitude...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780295
EISBN: 978-1-62708-281-5
... + ϕ 2 / B 2 + 3 / 4 G 1 ] where the subscripts 1 and 2 refer to polymer and composite, respectively; ϕ is the volume fraction; α is the CTE; B is the bulk modulus; and G is the shear modulus. Powder-filled epoxy resin systems have been developed for use...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410315
EISBN: 978-1-62708-265-5
.... In addition to slip deformation of the ferrite and cementite, localized shear band formation through the pearlite lamellae is another observed deformation mechanism. Cementite lamellae have been found to dissolve partially or completely at high strain deformation, and atom probe studies show that the carbon...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410405
EISBN: 978-1-62708-265-5
... produced by tensile testing at 150 °C and Fig. 18.7 shows details of the stress-strain curves that exhibited serrated yielding. Serrated yielding occurred after a critical strain, ε C , was achieved, and each drop in load corresponded to a shear-band type of surface marking that developed on the sheet...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460067
EISBN: 978-1-62708-285-3
....2005.10.005 3.20 Wright T.W. , The Physics and Mathematics of Adiabatic Shear Bands , Cambridge University Press , 2002 3.21 Schoenfeld S.E. and Wright T.W. , A Failure Criterion Based on Material Instability , Int. J. Solids Struct. , Vol 40 ( No. 12 ), 2003 , p 3021...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610585
EISBN: 978-1-62708-303-4
... bands, shear cracks), center bursts, galling Warm working (b) Triple-point cracks/fractures, grain-boundary cavitation/fracture Hot working Hot shortness, center bursts, triple-point cracks/fractures, grain-boundary cavitation/fracture, shear bands/fractures Shear bands/fractures, triple...
Book Chapter

By Soumya Subramonian
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500001
EISBN: 978-1-62708-317-1
... μs) ( Ref 1.14 ). During this process, the heat produced has no time to dissipate as quickly as it is being generated. The material softens instantly (known as adiabatic softening), and the produced adiabatic shear bands can split both soft and hard materials. During adiabatic blanking, because...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270053
EISBN: 978-1-62708-301-0
.... Metallography of the wedge head showed the presence of adiabatic shear bands with untempered martensitic structure. Impact of the hammer as a result of high strain rate produces localized shear, the local temperature rising high enough to produce austenite, which rapidly cools to martensite. On striking again...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780199
EISBN: 978-1-62708-281-5
... mechanisms: shear flow and crazing ( Ref 1 ). Shear flow is a bulk phenomenon, and the plastic deformation is often homogeneous, except for the shear banding that occurs at high strains. Also, the density change during shear flow is small. Crazing is a localized form of deformation that initiates at points...
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
... and the resolved shear stress on each slip plane and associated slip direction. A highly damaged slip plane can go on to complete fracture. Figure 10.20 shows what Forsyth ( Ref 10.19 ) called a “persistent slip band.” By this, he meant that the slip band had so many deep grooves that attempts to level...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040059
EISBN: 978-1-62708-300-3
... of shear bands in the formed material often can be explained by excessive chilling of the surface layers of the formed part near the die/material interface. With the advancement of finite element modeling and the increase in computer speed, heat transfer in any forging and heat treatment condition can...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400169
EISBN: 978-1-62708-258-7
... in a shear burr along the outer edges of the specimen. The punched specimens can be mounted in a clamp or mounting compound, and the burr can be removed by grinding. It is important to keep the punch dies as sharp as possible in order to minimize the burr. Band Saw A band saw uses a continuously...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2011
DOI: 10.31399/asm.tb.cfw.t52860115
EISBN: 978-1-62708-338-6
... standard for short-beam shear and tensile ring testing. Dick Young was one of the early leaders who filed key patents in this fledgling technology and then started his own company. His development work included filament-wound pipe nozzles and prototype RMCs. He licensed this technology to several other...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410213
EISBN: 978-1-62708-265-5
..., τ is the applied shear stress, τ 0 is the shear stress for a constant velocity of 1 cm/s, and m is a constant. Figure 11.10 shows the dependence of dislocation velocity on stress and its close relationship to the velocity of Lüders band propagation ( Ref 11.20 ). The stress drop is explained...