Abstract
A quasi-static testing device for applying the combined loading of tension and torsion to a thin walled tubular specimen was devised. Using this device and the dynamic combined testing device reported in the previous paper, some experiments were performed on annealed commercial pure copper. And some yield conditions and stress-strain curves were obtained at the strain rate of 10-4 ∼ 102 /s. Consequently the following were obtained. The yield stress of this material didn't agree with Mises' yield condition. And the value of θ = γ^^·Pσ/e^^·Pτ was about 3.4 ∼ 3.9.
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