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論文
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神宮, 利夫 ; 松本, 浩之 ; 根津, 紀久雄 ; 坂本, 賢治
概要:
application/pdf<br />Journal Article<br />In the collision between the flat surface of solid and of a sphere, it can be considered that a high stress will be occur, since an impact load is applied in a small local contact area. If an
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impact stress exceeds the yield stress of a material, the local deformation of the contact surface converts from elastic to plastic flow. Therefore, the impact load may be moderated. It is important when formulating the impact load that the effect of the local plastic deformation of the contact surface on the time history of a load due to impact is investigated. On the other hand, it is revealed by Hertz's theory that the relationship between a force and the amount of approach of both solids during impact is nonlinear. If it is postulated as being linear, there is not little what be able to apply it to analyze the dynamic impact problem. In this paper, the effect of the local displacement behavior in the contact process on the impact load is shown by the experiment of a collision between a plate of mild steel and a high hardness steel ball. The impact load is evaluated by a piezo electric plastic transducer. The limitation which the modified approach of Hertz's theory is valid, are distinguished.
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論文
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神宮, 利夫 ; 松本, 浩之 ; 根津, 紀久雄
概要:
application/pdf<br />Journal Article<br />In this paper, the dynamic similarity of transient response caused by the collision between a sphere and a cantilever beam is theoretically investigated and the results are compared with the
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experiments. The theoretical analysis of transient response in a cantilever beam is conducted by the use of classical beam theory and with the aid of a Laplace transform which extends the fast Fourier transform to an inverse transform under the condition that the spheres strike cantilever beams at arbitrary points. The dynamic similarity of a cantilever beam is studied to use those results. In the experiment, the bending strain is measured by a strain gauge cemented to a bar of rectangular cross section of the model or the real thing. It is shown that the variation in bending strain of the model multiplied by the coefficient of similarity is in agreement with the real thing.
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論文
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神宮, 利夫 ; 根津, 紀久雄
概要:
application/pdf<br />Journal Article<br />直径に沿って対向した集中荷重が時間に対してステップ関数状に変動する衝撃荷重を受ける球の衝撃応力を動的弾性理論に基づきラプラス変換法を適用して解析を行い球の各
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部の変位及び応力の時間的変動を明らかにした. ラプラス変換解は変数分離法によって誘導されるルジャンドル関数と第1種ベッセル関数で表されラプラス逆変換は留数定理を適用することによって行った. 解析結果は時間に対する変位及び応力に変動を図示した.
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