Abstract
The present experiment was carried out for the effect of speed of cyclic stressing upon the fatigue strength of 18-8 stainless steel wire. The followings are the results obtained:The fatigue strength which is governed by the reduction factor is larger in the case of higher speed (12000rpm) than in that of lower speed (1000rpm).(1) That of austenite structure may be varied in the range of 1000-12000rpm but that of 12000rpm is higher by 16% than that of 1000rpm.(2) That of 41% reduction factor may be varied in the range of 1000-12000rpm.(3) Specimens of over 80% reduction factor with martensite structure which were worked very hard may be sensitively governed by the speed of cyclic stressing. That is, that of 12000 rpm is higher by about 20-25% than that of 1000rpm.(4) Irrespective of the value of reduction factor, the temperature rise of the specimen due to the repeated stress falls below 70°C in the neighbourhood of endurance limit.(5) The temperature rise of the specimen just after fatigue fracture is governed by the value of speed of cyclic stressing and repeated stress. It is about 700°C in specimens with austenite structure, which were tested under the speed of cyclic stressing of 4000rpm and the repeated stress with over yield point value, and also it is about 200-400°C in the specimens with martensite structure which were worked hard.
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