The Propagation of Adiabatic Shear

Backman, Marvin E.; Finnegan, Stephen

doi:10.1007/978-1-4615-8696-8_30

Cited by 45 publications

(20 citation statements)

References 3 publications

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“…For example, multiple shear bands are often found in ballistic impact, but loading conditions at the bottom and lateral wall of a crater are quite different. Backman and Finnegan [14] first compared the shear-band pattern in ballistic impact with the theoretical slip-line as a result of local surface loading. The traces of shear bands are incredibly similar to one of the families of slip lines.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the collapsing thick-walled cylinder technique for shear-band spacing

Xue

Nesterenko

Meyers

2003

International Journal of Impact Engineering

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The thick-walled cylinder (TWC) technique was successfully used to investigate the shear-band patterning in AISI 304 stainless steel. Several factors that may influence the shear-band distribution and spacing in the TWC configuration were examined. The role of machining, annealing, and shrink fitting, as well as the variation of the shear-band distribution along the longitudinal axis of the cylindrical specimen were evaluated. Experimental results indicate that the machined surface at the internal boundary of the cylindrical specimen, where shear bands initiate, provides a strain-hardened layer that significantly changes the condition for their initiation. Specimens with such a layer have a higher density of bands with a smaller spacing, in comparison with those without a work-hardened layer. The nature of contact interface in the cylindrical specimen assembly, either causing a clearance that changes the initial loading conditions or introducing a pre-strained layer with shrink-fitting technique, does not influence the spacing of shear bands, but does affect the evolution and development of multiple shear bands at the initial stage. The distribution of shear bands along the cylinder has a constant spacing but the maximum lengths of bands are sensitive to the position. The collapse process of the cylindrical specimen was simulated by using the RAVEN hydrocode. The deformation, temperature, and velocity histories during the cylinder collapse were calculated. The calculated results are in good agreement with the previous experimental data. r 2002 Elsevier Science Ltd. All rights reserved.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the collapsing thick-walled cylinder technique for shear-band spacing

Xue

Nesterenko

Meyers

2003

International Journal of Impact Engineering

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“…Such shear bands arising from localization of deformation occur more readily in materials with a low work-hardening rate, low strain-rate sensitivity, low thermal conductivity and a high thermal softening rate. Traditionally, shear bands have been classified into two types, deformed bands and transformed bands, the latter suggestive of a transformation having occurred within the band during (or after) its formation [2,3]. According to this classification, transformed bands in steels may be as narrow as 5-10 tm and will appear white after etching with a Nital solution.…”

Section: Executive Summarymentioning

confidence: 99%

Microstructural Evolution during the Dynamic Deformation of High Strength Navy Steels

Kumar¹

2008

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Tihe public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspec of this collection of information, including suggestions for reducing the burden, SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)Office of Naval Research Regional Office Boston NA 495 Sumner Street Room 627Boston, MA 02210-2109 SPONSOR/MONITOR'S REPORT NUMBER(S) NA DISTRIBUTION/AVAILABILITY STATEMENTApproved for Public Release; Distribution is Unlimited SUPPLEMENTARY NOTES None ABSTRACTWe have characterized the propensity for adiabatic shear band formation (an associated microstructural evolution) under dynamic deformation conditions in an ultra-high strength (160 Ksi/1.1GPa) Fe-10 Ni-0.IC-Cr,Mo,V steel and demonstrated that this steel is highly prone to shear localization and failure. In the as-received condition, the steel has a lath martensite microstructure. During dynamic deformation, shear localization occurs and manifests by an optically visible shear band; the original microstructure is discernible within the band. With progression in severity of localization, there is evidence for a central region within the shear band composed of -300 nm size equiaxed grains constituting austenite, with a low dislocation content, and heavily twinned ferrite. In the extreme situation, a crack "chases" the shear band, and examination of the resulting fracture surfaces provides evidence for the presence of a thin liquid film layer. We have also observed that lowering the Ni content in the alloy significantly and adding Cu to the alloy, enables improvements in resistance to shear localization, both in terms of initiation and propagation of the shear band. SUBJECT TERMSadiabatic shear band formation, dynamic deformation, ultra-high strength 1ONi steel, microstructural evolution, lath martensite microstructure, shear localization Executive SummaryWe have characterized the propensity for adiabatic shear band formation under dynamic deformation conditions in an ultra-high strength (160 Ksi/1.IGPa) lONi steel and demonstrated that in spite of its outstanding static toughness, this steel is highly prone to shear localization and failure. Specifically, microstructural evolution during deformation of a Fe-10 Ni-0. 1 C-Cr,Mo,V steel was examined. In the as-received condition, the steel has a lath martensite microstructure, and during quasi-static deformation, shear appears to be accommodated by lath rotation and lath thinning. During dynamic deformation, shear localization occurs and manifests by an optically visible shear band. Initially, the original microstructure is discernible within the band. With progression in severity of localization, there is evidence for a central region within the shear band composed of -300 nm size equiaxed grains...

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“…The bands are narrow, on the order of 10 to 100 pm in width. There are two types of adiabatic shear bands that have been classified as "deformation" type and "transformation" type (Backman & Finnegan 1973). Deformation-type bands are typical for aluminum alloys (Wingrove 1973;Leech 1985), austenitic steels, and low-strength ferritic steels.…”

Section: Adiabatic Shear Band Characteristicsmentioning

confidence: 99%

High-Rate Shear Deformation and Failure in Structural Alloys

Dawson¹

2002

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Experiments were conducted to determine the dynamic shear behavior of a wide range of aluminum, titanium, and steel alloys. Principal experimental techniques were the torsional Kolsky bar and the Shear Compression Specimen (SCS) geometry. For the purpose of determining adiabatic shear susceptibility in this range of alloys, it was found that both techniques were unable to induce adiabatic shear in alloys resistant to that failure mode. The SCS geometry has demonstrated a capability for characterizing shear deformation behavior over a wide range of strain rates. For modeling and simulation of adiabatic shear phenomena, an improved adiabatic temperature evolution equation has been implemented. Finite element simulations of the torsional Kolsky and SCS geometries were conducted to evaluate the influence of pre-existing geometric inhomogeneities on adiabatic shear band initiation. 3

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The Propagation of Adiabatic Shear

Cited by 45 publications

References 3 publications

Evaluation of the collapsing thick-walled cylinder technique for shear-band spacing

Evaluation of the collapsing thick-walled cylinder technique for shear-band spacing

Microstructural Evolution during the Dynamic Deformation of High Strength Navy Steels

High-Rate Shear Deformation and Failure in Structural Alloys

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