Abstract
The effects of cold rolling reduction and purity on the fatigue properties of commercially pure Titanium sheets were studied on Schenck's vibrating sheet bending machine. Internal heating phenomenon and corrosion-fatigue prorerties of rotating-beam specimen were studied on Ono's rotary bending machine.Following results were obtained:(1) The fatigue ratio (fatigue limit to nominal tensile strength) ranges from 58 to 66 per cent for annealed sheets and from 45 to 51 per cent for 50 per cent cold rolled sheets. These ratios decrease with cold rolling reduction.(2) Fatigue limits are affected by the purity.(3) Relations between fatigue limit and tensile strength are summarized in Fig. 5.(4) Internal heating phenomenon is observed on unnotched rotating-beam fatigue specimens tested above the fatigue limit, but not observed on notched specimens.(5) Corrosion-fatigue properties are excellent both in water and in 3% NaCl aq. solution.(6) Since these liquids behave as a coolant to internal heating phenomenon, fatigue limit increases 6kg/mm2 than that of in air.
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