Abstract
The paper presents experimental results obtained with aluminium tube test pieces subject to torsion at fixe different rates ranging from tgy = 1,66-10-5 1/sec to tgy = 0,624 1/sec. The tests have been performed by means of a special machine constructed at the Plasticity Group of the IPPT.As a result of experiments the influence of strain-rate on the strain-hardening curve has been found to be nonexisting in a certain velocity range. Empirical relations have been obtained describing this phenomenon. The paper contains also a brief discussion of the results obtained from the viewpoint of tests by other authors and that of physics of metals.
References
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[2] J.D. LUBAHN, R. P. FELGAR, Plasticity and Creep of Metals, J. Wiley, New York-London 1961.
[3] C. W. McGREGOR, J. C. FISHER, Tension tests at constant true strain rates, J. Appl. Mech., 4, 12 (1945), A-217.
[4] D. McLEAN, Mechanical Properties of Metals, J. Wiley New York-London 1962.
[5] M.J. MANJOINE, Effect of rate of strain on the flow stress of gas turbine alloys at 1200 and 1500°F, Proc. ASTM, 50 (1950), 931.
[6] A. NÁDÁI, J. MANJOINE, High speed tension tests at elevated temperatures, J. Appl. Mech., 2, 8 (1941), A-77.
[7] A. NADÁI, Theory of Flow and Fracture of Solids, Vol. II, McGraw Hill, New York-London 1963.
[8] D. F. STEIN, J. R. Low, Mobility of edge dislocations in siliconiron crystals, J. Appl. Phys., 2, 31 (1960), 362.
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[10] [in Russian]
[11] [in Russian]
[12] [in Russian]
[2] J.D. LUBAHN, R. P. FELGAR, Plasticity and Creep of Metals, J. Wiley, New York-London 1961.
[3] C. W. McGREGOR, J. C. FISHER, Tension tests at constant true strain rates, J. Appl. Mech., 4, 12 (1945), A-217.
[4] D. McLEAN, Mechanical Properties of Metals, J. Wiley New York-London 1962.
[5] M.J. MANJOINE, Effect of rate of strain on the flow stress of gas turbine alloys at 1200 and 1500°F, Proc. ASTM, 50 (1950), 931.
[6] A. NÁDÁI, J. MANJOINE, High speed tension tests at elevated temperatures, J. Appl. Mech., 2, 8 (1941), A-77.
[7] A. NADÁI, Theory of Flow and Fracture of Solids, Vol. II, McGraw Hill, New York-London 1963.
[8] D. F. STEIN, J. R. Low, Mobility of edge dislocations in siliconiron crystals, J. Appl. Phys., 2, 31 (1960), 362.
[9] F. WEINBERG, Grain boundaries in metals, Progress in Metal Physics, Vol. 8, Pergamon Presss, 1959.
[10] [in Russian]
[11] [in Russian]
[12] [in Russian]
