Determination of the viscosity factor of D16 aluminum alloy in penetration of a cone

Степанов, Г. В.; Vashchenko, A. P.

doi:10.1007/bf01530344

Cited by 3 publications

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“…By analyzing test data from uniaxial tension (compression) at a high strain rate and by studying the decay of the elastic precursor of a plane wave, the structure of the profile of a shock wave [27], the initial stage of penetration of a cone [28], and expansion of a cavity in metal [29], for aluminum alloys we established the continuous dependence of the viscosity coefficient on strain rate in the rate range from 103 to i0'. The dependence here is in the form of a nonmonotonic function (Fig.…”

Section: = X T (E~) + K~ (E~) In E~/eo (E~) (1 ' )mentioning

confidence: 99%

Deformation of metals at strain rates above 104 sec?1

Степанов¹,

Kharchenko²

1985

Strength Mater

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Section: = X T (E~) + K~ (E~) In E~/eo (E~) (1 ' )mentioning

confidence: 99%

Deformation of metals at strain rates above 104 sec?1

Степанов¹,

Kharchenko²

1985

Strength Mater

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“…After analyzing known estimates of the absolute viscosity of metals obtained by various methods (uniaxial compression of cylindrical shells [17,18], introduction of a nondeformable striker with a conical head into a barrier [19], collapse of cylindrical shells by the energy from an explosion [12,20], collision of plates in the explosive-welding regime [14,15,21], study of the decay of an elastic precursor [22] or the rate dependence of resistance to deformation [23,24], measurement of the width of the front of a shock wave [16,25], study of the laws governing the propagation of small perturbations [1, 2] and the kinetics of cleavage fracture [26,27]), we conclude that absolute viscosity may vary by several orders of magnitude for the same given metal, depending on the test conditions. Table 1 shows experimental data taken from the above-cited sources for alumintun and lead (these being the metals that have been studied the most) within a broad range of compressions.…”

mentioning

confidence: 99%

Viscosity of aluminum and lead in shockwave experiments

Огородников¹,

Sadovoi²,

Tyun'kin³

et al. 1995

J Appl Mech Tech Phys

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Many engineering problems can be modeled within the framework of non-dissipative gasdynamic flows. However, some problems also involve large strains of various types of shells, and accounting for the elastoplastic properties of the materials becomes important if the characteristic pressures are too much greater than the yield point. By making such allowances, it is then possible to more accurately calculate the final strains and evaluate the heating of the shell due to dissipative forces. Also, dissipative losses due to viscous forces become important for high-speed flows characterized by high strain rates [1][2][3][4][5][6].Heating due to viscosity is usually characterized by large discontinuities in the dissipation of kinetic energy into heat. The greatest local heating is realized near various physical discontinuities in the material being deformed, i.e., near foreign inclusions and cavities, at grain boundaries and slip planes, etc. Nonuniform heating of the material due to viscosity will obviously lower its strength characteristics and can thereby facilitate deformation along certain planes and directions [6]. Typical examples of the latter are the piercing of a shell by a fragment or the deep penetration of a barrier by microscopic particles. Such penetration has recently been the subject of intensive research [7]. At the same time, these examples also serve to illustrate the present state of fracture mechanics, which has as yet been unable to quantitatively describe such experiments [8-101.It has long been known that dissipative processes are nontrivial in high-rate viscoplastic flows. For example, the authors of [1, 2] studied the dependence of the viscosity of several materials on compression and temperature behind a shock wave (compression range cr < 2, temperature T -104 ~ The viscoplastic properties of the materials were also studied in [3,11,12] in tests involving the inertial collision of cylindrical shells (compression a -1, temperature T -103 ~ The shells were accelerated and collided in these experiments as a result of energy supplied by an explosive. In this scheme, the parameters of the explosive charge and the shells can be chosen so that all of the initial kinetic energy of the shell is transformed into heat and the shells are left with a certain radius.It has been established that the main physical processes which occur in the shell material are characterized by nonuniform heating of the shell material through the thickness. The greatest degree of heating is reached on the internal boundary of the shell, and the degree of nonuniformity of the heating increases toward the shell's center [11,13]. This alters properties such as dynamic yield point and absolute viscosity.The phenomena mentioned above are likely to be seen to some extent in any high-rate viscoplastic flow. Progress in systematically accounting for dissipative losses during intensive viscoplastic flows in different problems involving high energy densities is being slowed by the lack of adequately developed phenomenological models ...

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Estimate of the ultimate deformation in the rupture of metal pipes subjected to intense loads

Serikov¹

1987

J Appl Mech Tech Phys

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Determination of the viscosity factor of D16 aluminum alloy in penetration of a cone

Cited by 3 publications

References 2 publications

Deformation of metals at strain rates above 104 sec?1

Deformation of metals at strain rates above 104 sec?1

Viscosity of aluminum and lead in shockwave experiments

Estimate of the ultimate deformation in the rupture of metal pipes subjected to intense loads

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