Study of adiabatic localized shear in metals by split Hopkinson pressure bar method

Pushkov, V. A.; Yurlov, Alexey; Bolshakov, A. P.; Podurets, A. M.; Кальманов, А В; Koshatova, E.

doi:10.1051/dymat/2009056

Cited by 2 publications

(8 citation statements)

References 2 publications

(2 reference statements)

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“…In Fig. 3(c), the impact shear toughness under dynamic shear loading using hat-shaped specimen is plotted against the dynamic shear yield strength for our data, along with other data points (with similar hat-shaped specimen design) for various steels (Xue et al, 2005;Bronkhorst et al, 2006;Pushkov et al, 2009). As indicated, the intercritically annealed 0.2C5Mn TRIP steel has 2 times or even higher of impact shear toughness at the similar dynamic shear strength level when compared to the other steels.…”

Section: Resultsmentioning

confidence: 64%

Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

Yuan

Bian

Jiang

et al. 2015

Mechanics of Materials

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a b s t r a c tThe dynamic properties of an intercritically annealed 0.2C5Mn steel with ultrafine-grained austenite-ferrite duplex structure were studied under dynamic shear loading. The formation and evolution mechanisms of adiabatic shear band in this steel were then investigated using interrupted experiments at five different shear displacements and the subsequent microstructure observations. The dynamic shear plastic deformation of the 0.2C5Mn steel was observed to have three stages: the strong linear hardening stage followed by the plateau stage, and then the strain softening stage associated with the evolution of adiabatic shear band. High impact shear toughness was found in this 0.2C5Mn steel, which is due to the following two aspects: the strong linear strain hardening by martensite transformation at the first stage, and the suppressing for the formation of shear band by the continuous deformation in different phases through the proper stress and strain partitioning at the plateau stage. The evolution of adiabatic shear band was found to be a two-stage process, namely an initiation stage followed by a thickening stage. The shear band consists of two regions at the thickening stage: a core region and two transition layers. When the adjoining matrix is localized into the transition layers, the grains are refined along with increasing fraction of austenite phase by inverse transformation. However, when the transition layers are transformed into the core region, the fraction of austenite phase is decreased and almost disappeared due to martensite transformation again. These interesting observations in the core region and the transition layers should be attributed to the competitions of the microstructure evolutions associated with the non-uniformly distributed shear deformation and the inhomogeneous adiabatic temperature rise in the different region of shear band. The 0.2C5Mn TRIP steel reported here can be considered as an excellent candidate for energy absorbers in the automotive industry.

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Section: Resultsmentioning

confidence: 64%

Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

Yuan

Bian

Jiang

et al. 2015

Mechanics of Materials

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“…We have previously implemented the study of the formation of localized shear in copper M1 in as-delivered condition on samples with the overall dimensions of Ø10× 5 mm [10]. The structure of this copper is characterized by a large grain size of ∼ 110 µm.…”

Section: Materials and Procedures Of Studiesmentioning

confidence: 99%

“…The procedure with use of the SHPB method (figure 3a) is described in detail in [10]. Some peculiarities should be stressed for tests with previously loaded copper.…”

Section: Materials and Procedures Of Studiesmentioning

confidence: 99%

“…Some peculiarities should be stressed for tests with previously loaded copper. All sizes of samples used by us earlier [10] were decreased proportionally by a factor of 1.4 on account of small dimensions of blanks. Hat-shaped samples were applied with a predetermined direction of forced shear.…”

Section: Materials and Procedures Of Studiesmentioning

confidence: 99%

“…Displacement of samples ends relative to each other and shear stress in a sample were determined when using strain pulses being recorded by the help of strain gages on bars. A shear component of loading was defined based on sample's geometry without regard for expansion effect of a cylindrical base of the sample [10]. Shear stress was calculated on the basis of the supposition that a shearing force is exerted only at shear section between two edges of a sample (section of T-B in figure 3b).…”

Section: Materials and Procedures Of Studiesmentioning

confidence: 99%

See 2 more Smart Citations

Influence of preloading on formation of adiabatic localized shear in copper

Pushkov¹,

Yurlov²,

Podurets³

et al. 2012

EPJ Web of Conferences

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Abstract. This paper is devoted to results of investigation of localized shear in as-received copper, and which was subjected to preliminary quasi-isentropic shock loading by the pressure of ∼ 30 GPa. Tests were performed with hat-shaped samples by the Split Hopkinson Pressure Bar method (SHPB). The authors present estimation of quantitative characteristics of localized shear in tested materials (shear stress, relative shear strain, shear band width, relative strain rate in shear band). The paper includes data of metallographic investigations of the tested samples. Also the authors made an attempt of numerical simulation of stress field change during formation.

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Study of adiabatic localized shear in metals by split Hopkinson pressure bar method

Cited by 2 publications

References 2 publications

Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

Influence of preloading on formation of adiabatic localized shear in copper

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