Evaluation on Fatigue Characteristics of Thin Plates for Diaphragm
Masaru ZAKO, Tetsusei KURASHIKI, Satoshi HANAKI, Hiroaki NAKAI, Atsuji ITO and Masao FUKUDA
Abstract:Diaphragms made of a stainless steel plates are widely used as switching parts in electronic devices. Due to the cyclic loading applied to these diaphragms, the estimation of the lives of diaphragms is important to decide that of the electronic devices. The fatigue characteristic of the diaphragm must be discussed with considering the large scatter of material properties induced by the anisotropy. In this study, the tensile and the fatigue tests have been carried out some specimens with a direction to cold rolling direction. A pulley driving system was adopted as a fatigue testing apparatus because the load can be easily applied even when the thickness of the specimen is less than 0.1mm. From the experimental results, we have decided the S-N curve by applying large scatter of fatigue lives to the probability distribution based on reliability, and drew the Goodman diagram to avoid the effect of the mean stress. The obtained results can be used for fatigue design considering the anisotropy in the case of high cycle fatigue for diaphragms. Key Words:Diaphragm, Thin plates, Fatigue, Pulley driving system, Anisotropy, Goodman diagram, Reliability