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Adiabatic shear

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Published: 01 June 2016
Fig. 3.6 Calculated contours of a copper particle impacting onto a copper substrate at four different velocities. The dotted lines at the particle-substrate interfaces indicate the areas that undergo adiabatic shear instability. Source: Ref 3.50 More
Image
Published: 01 June 2016
path. Both strain and stress increase monotonically by approaching the interface for 300 m/s (1000 ft/s), whereas for 900 m/s (3000 ft/s) the shear stress exhibits a drastic decrease at the interface, indicating adiabatic shear instability. Source: Ref 3.15 More
Image
Published: 01 June 2016
Fig. 2.6 Modeling results showing the interface temperatures under impact of copper onto copper at a velocity of 600 m/s (2000 ft/s). The results clearly show that the “south pole” area around the point of initial contact does not reach conditions for adiabatic shear instabilities. Source More
Image
Published: 01 June 2016
to 1900 ft/s), indicating adiabatic shear instability. Source: Ref 3.15 More
Image
Published: 01 June 2016
particle and substrate for particle impact velocities of 500 and 525 m/s (1640 and 1720 ft/s), which is above the critical velocity for formation of adiabatic shear instabilities (ASI). The point is chosen to be in the region of ASI. The temperature profile along the interface in (a) in principle also More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460067
EISBN: 978-1-62708-285-3
... and bonding of particles in cold spraying ( Ref 3.19 ). Adiabatic Shear Instability Adiabatic shear instability is generally associated with high-strain-rate plastic deformation. It is normally a cause for failure of metallic components subjected to dynamic loading, which is manifested as formation...
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
... place at very high strain rates, of the order of 10 6 s −1 . Two important microstructural changes, namely, adiabatic shear and twinning, can take place under such conditions. Adiabatic Shear When the deformation is highly localized, and the heat of plastic deformation cannot be dissipated fast...
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...
Image
Published: 01 December 2006
Fig. 5.16 Heating from deformation and shear deformation of the peripheral layer in the adiabatic limiting case (example, AlMgSi0.5: flow stress 25 MPa, billet length: billet Φ = 4, extrusion ratio 30). 1, temperature increase up to the entry into the deformation zone; On exit from the die: 2 More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1985
DOI: 10.31399/asm.tb.sagf.t63420085
EISBN: 978-1-62708-452-9
... in an area that has not been deformed but has definitely been transformed. Each area has distinct boundaries, and the oncoming cracks appear to follow those boundaries. Many academic studies refer to these same structures as transformed shear band products formed by “adiabatic shear.” 5 Fig. 4-21...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460017
EISBN: 978-1-62708-285-3
... time frame of approximately 50 ns, the plastic deformation and the temperature rise remain highly localized. Critical conditions for bonding are achieved if the thermal softening overcompensates the strain hardening and strain-rate hardening of the material, resulting in so-called adiabatic shear...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390007
EISBN: 978-1-62708-459-8
... of the Theory of Elasticity, Plasticity and Viscoelasticity . CRC Press , 2013 . 10.1201/b13109 [42] Dodd B. and Bai Y. , Introduction to Adiabatic Shear Localization . Imperial College Press , 2015 . [43] Wang Z.R. , Hu W. , Yuan S.J. , and Wang X...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270053
EISBN: 978-1-62708-301-0
... with the hammer, the wedge head can absorb the energy and plastically deform to take a mushroom shape, thereby warning of imminent chipping. 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860001
EISBN: 978-1-62708-348-5
... frequencies, for example. Paragraph 1.5.4 describes differences between constant-temperature (isothermal) and constant-entropy (adiabatic) elastic constants. 1.2.2 Bulk Modulus Rather than compressibility, scientists often use the bulk modulus, B , to describe a solid’s resistance to volume change...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980059
EISBN: 978-1-62708-342-3
... of the billet in the container. The process stops when the discard length l R is reached. The container then opens a short distance so that the discard can be separated from the die and the extrusion by a shear blade. The extrusion can then be pulled from the die. The container and the stem (with a loose...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460001
EISBN: 978-1-62708-285-3
... and the material combination is suitable for the process, upon impact the particles undergo adiabatic heating and plastically deform at very high shear rates, causing them to flatten out and bond to the underlying surface ( Ref 1.1 , 1.2 ). This bonding mechanism is very similar to the adiabatic shear instability...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250257
EISBN: 978-1-62708-345-4
... band product formed by adiabatic shear. Spalling Spalling, in general, is not considered an initial mode of failure but rather a continuation or propagation of macropitting and rolling-contact fatigue. It is very common to reference this failure mode as pitting and spalling. For example, Fig...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860237
EISBN: 978-1-62708-348-5
... be discussed using the deformation behavior maps shown in Figs. 7.1a and 7.1b ( Ashby, 1972 ). The axes of these graphs are normalized temperature and normalized stress. Temperature, T , is normalized to the melting temperature, T m ; stress, σ , is normalized to the shear modulus, G . Boundaries...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460185
EISBN: 978-1-62708-285-3
..., composites, and multilayered functionally gradient materials are generally difficult to produce but can be deposited by cold spraying. Lower process temperatures and the formation of the deposit by high-velocity impact result in surface cleaning and adiabatic shear phenomena. These improve the adhesion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780267
EISBN: 978-1-62708-281-5
... and friction phenomena are influenced mainly by the shear and adhesive properties of the transferred film. Reprinted with permission from Ref 1 A distinction within the interfacial wear process may be made based on whether or not the frictional heat dissipation is isothermal or quasi-adiabatic...