Plastic Flow of Platinum Wires

Abstract

The strain-time behavior of annealed platinum wires at constant stress and temperature is reported for a wide range of experimental conditions, namely: 1550 to 78°K, 900 to 40,000 p.s.i., 0.001 to 0.1 strain, 10−1 to 10−6 min.−1 strain rate. The following relations were found to describe the results satisfactorily: σ=Aε̇n|ε,T; σ=BepT|ε,ε̇,ε=Cta|σ,T; Q∼logσ|ε; ∂n∂T=∂p∂logε̇|ε,where σ=stress, ε=strain, σ=strain rate, T=absolute temperature, Q=activation energy for rate of deformation, t=time, and A, B, C, a, n, and p are constants.