6/4黄銅薄板におけるき裂進展速度に及ぼす繰返し速度の影響とその逆転現象

概要

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Experiments have been made to study the influence of loading frequency on fatigue crack propagation rate (FCPR) in 6/4 Brass plate. The experiments have been carried out in air and at room temperature in accordance with ASTM E 647 91. Compact tension (CT) specimens with an orientation T-L and 2.8mm in thickness were tested under three frequencies (2.5,5,8 Hz) of sine waveform tension-tension load. It was found that the FCPR increases with the increase of frequency under the condition that stress intensity factor range, ΔK, is between 13 and 31 MPa・m^<1/2> in the case of R=0.11. And in the case of R=0.02,the FCPR decreases with the increase of frequency under the condition that ΔK is between 15 and 38 MPa・m^<1/2>. The results were testified by scanning electron-microscope (SEM) fractographical studies.
1998-04-26