. The Bell System technical journal . I D E Fig. 11—^Photomicrographs of Fatigue , 4 B. & S. Nos. Hard, Stress 28,750 Psi, 800,000 cycles, mag. Bronze, 4 B. & S. Nos. Hard, Stress 25,500 Psi, 2,600,000 cycles, mag. G Brass, Annealed, Stress 15,750 Psi, 2,471,200 Cycles, Mag. , Spring Hard, Stress 25,500 Psi, 1,186,900 Cycles, Mag. Brass Alloy No. 33, Stress 18,200 Psi, 850,000 Cycles, Mag. 200. Prepared by Miss A. K. Marshall 588 BELL SYSTEM TECHNICAL JOURNAL The improvement in the endurance Hmit due to cold rolling brass,ni
. The Bell System technical journal . I D E Fig. 11—^Photomicrographs of Fatigue , 4 B. & S. Nos. Hard, Stress 28,750 Psi, 800,000 cycles, mag. Bronze, 4 B. & S. Nos. Hard, Stress 25,500 Psi, 2,600,000 cycles, mag. G Brass, Annealed, Stress 15,750 Psi, 2,471,200 Cycles, Mag. , Spring Hard, Stress 25,500 Psi, 1,186,900 Cycles, Mag. Brass Alloy No. 33, Stress 18,200 Psi, 850,000 Cycles, Mag. 200. Prepared by Miss A. K. Marshall 588 BELL SYSTEM TECHNICAL JOURNAL The improvement in the endurance Hmit due to cold rolling brass,nickel silver and phosphor bronze is not consistent with the increasein tensile strength produced by the same means. This is shown byTable II where in practically every instance material hardened bycold work shows a progressive decrease in the ratio of endurancelimit to tensile strength.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
