過渡的温度こう配下の熱疲労試験機の試作と二,三の実験

概要

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Up to the present, the investigations on the thermal fatigue have been carried out mainly under conditions of cyclic uniform heating and cooling in the cross-section of specimen, but in practice we meet with many cases in which the cross-section of materials are subjected to various transient temperature gradients, while studies in these cases have not been made sufficiently. Therefore, in order to investigate these problems we have constructed a new type of thermal fatigue testing machine. With this testing machine the wedge-shaped specimen was rapidly heated by high-frequency-induction, and then cooled in water reciprocally, so at to make transient temperature gradient in its cross-section. By this method, in the specimen the bending and the axial thermal strains were introduced. In our machine, the bending strain was restricted and the axial thermal strain was freely released. The average heating rate at heating surface may change from 50℃/sec to 300℃/sec, and in the range of 10 mm along gage length of specimen the same temperature distribution is obtained. Some experimental results of 13 Cr steel and 18-8 steel showed that our machine was suitable to the thermal fatigue testing under conditions of transient temperature gradient in cross-section.
社団法人日本材料学会の論文
1965-11-15