The temperature and strain-rate dependence of the shear strength of mild steel

Campbell, J. D.; Ferguson, W. G.

doi:10.1080/14786437008238397

Cited by 397 publications

(129 citation statements)

References 15 publications

(4 reference statements)

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“…Similar results are obtained for mild-steel [18], where the asymptotically increasing stress associated with strainrates, increasing above about has been attributed to phonon drag [19]. But dislocation velocity and shear strain rate remain proportional [17] if the dislocation density remains constant and the above effects in lithium fluoride and mild-steel obviously owe their existence to a common cause.…”

Section: Introductionsupporting

confidence: 73%

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Dynamic Transverse Deflection of a Free Mild-Steel Plate

Bish¹

2013

WJM

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The problem analytically investigated is that a thin free plate of mild-steel struck at normal incidence by a flat ended rigid rod moving at high velocity. As in quasi-static deformation by extended slip, the strain-rate tensor is solenoidal and under dynamic loading conditions the Tresca yield criterion is modified so that the solenoidal property replaces the hypothesis of a viscoplastic overstress. Overstress then arises from inertial body forces and the high magnitudes found, in the following, for these forces are due to the influence of the propagating boundary. Two new theorems are proven. These theorems show that the deflection in the plate is entirely transverse, even in the case of indefinitely large punch deflections, and that the lines of equal transverse deflection in the plate are also principal lines of stress and strain-rate, as are the lines of steepest descent. A formula is obtained giving the inertial force opposing the punch as a function of the time and the theoretical deflection profile on a plate deformed by a flat-ended punch of circular section is presented. The stresses in the plate are then analyzed and it is shown that the stress inside the boundary in the direction of propagation, equals 2 , c  where  is the mass density of the plate material and the boundary wave propagates at speed c which, it is shown, is equal to one-half of the velocity of elastic waves of rotation in the solid concerned.

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Section: Introductionsupporting

confidence: 73%

“…The results of experimental investigations [18] suggest that in metals the overstress is a function of strain-rate and many writers have assumed that the strain-rate causes the overstress. Yet the strain-rate is an effect, it is not a cause.…”

Section: Discussionmentioning

confidence: 99%

Dynamic Transverse Deflection of a Free Mild-Steel Plate

Bish¹

2013

WJM

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“…46) Higher flow stresses activate a larger number of slip systems and promote grain subdivision and subgrain rotation. Greater hardening has been observed in metals strained at higher strain rates when compared at equal strain.…”

Section: Strain Ratementioning

confidence: 99%

Nanocrystallization of Steels by Severe Plastic Deformation

Umemoto

2003

Mater. Trans.

181

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The formation of nanocrystalline structure (NS) in steels by various severe plastic deformation processes, such as ball milling, a ball drop test, particle impact deformation and air blast shot peening are demonstrated. Layered or equiaxed nanograined region appeared near the specimen surface and dislocated cell structured region appeared interior of specimens. These regions are separated with clearly defined boundaries. The deformation induced nanograined regions have the following common specific characteristics: 1) with grains smaller than 100 nm and low dislocation density interior of grains, 2) extremely high hardness, 3) dissolution of cementite when it exist and 4) no recrystallization and slow grain growth by annealing. The deformation conditions to produce NS was discussed based on the available data in literatures. It was suggested that the most important condition is to impose a strain larger than about 7. High strain rates, low deformation temperature, multidirectional deformation, hydrostatic pressure are considered to be favorable conditions to produce NS. Introducing alloying elements, precipitates and second phase also enhance nanocrystallization by suppressing recovery. The mechanisms of the formation of sharply defined boundaries which separate nanograined structure region from dislocated cell structured region were discussed with respect to impurities, martensitic transformation and deformation. It was suggested several mechanisms may operate simultaneously in the formation of the clear boundaries.

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“…A further development of the top hat was the flat "modified double shear" specimen, which is essentially a radial slice through the cylindrical top hat (Klepaczko 1994;Klepaczko 1998). Other types of double linear shear specimens include the flat doubly-notched bar used earlier by (Campbell & Ferguson 1970), and the modified doubly-notched Charpy specimen of Cowie et al (1989). These adiabatic shear specimens are all designed to restrict plastic deformation to a very narrow gage section, where very high shear strains and strain rates can be achieved under impact loading.…”

Section: Experimental Backgroundmentioning

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 temperature and strain-rate dependence of the shear strength of mild steel

Cited by 397 publications

References 15 publications

Dynamic Transverse Deflection of a Free Mild-Steel Plate

Dynamic Transverse Deflection of a Free Mild-Steel Plate

Nanocrystallization of Steels by Severe Plastic Deformation

High-Rate Shear Deformation and Failure in Structural Alloys

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