ハモニカ用材料としてのPb入眞鍮板に関する研究(第5報) : 音程の自然變化と眞鍮板の彈性率の自然變化

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We measured the change of Young's modulus of the cold rolled brass plate (6:4), by means of the self oscillation method. E=48π^2 N^2 pl^4/m^4t^2 Where, E is Young's modulus, N number of self oscillation resonated, p specific gravity, l length of a test piece, m constant, and t thickness of the test piece. Young's modulus of a brass plate, for instance, is 9.279×10^<11> dyne/cm^2 in rolled direction and 11,150×10^<11> dyne/cm^2 in cross direction immediately after 50% cold roll, but after 195 hours, these values become 9.365×10^<11> dyne/cm^2 (former), and 11,307×10^<11> dyne/cm^2 (latter) (Fig1). If such cold ralled brass plates are used for reeds of harmonica, the discord will happen after many months. Young's modulus of cold rolled plate is changed by annealing as Fig 2. We propose to, anneal the plate at 200℃ or below, in advance to make it to reeds. Then no change of Young's modulus at room temperature is presumed from Fig 3, where test pieces have been annealed at 200℃ following the hold at 100℃. (1) The discussion of this phenomena will be done in the other report.
宇宙航空研究開発機構の論文
1951-03-10