Abstract
To investigate a cause of the circumferential rupture at the lower end of the rim-wing of a head sheave, a model experiment was carried out, and it was observed that both the upper ends of the rim-wings were opened outward. According to this observation, an approximate analysis has been done. In this analysis, a part of the rim between two arms was assumed as an uniformly loaded curved beam with two fixed ends, and the relative contraction between the upper end of the rim-wing and the lower end was calculated. Furthermore, the rim-wing of this part was assumed as an uniformly loaded rectangular-plate with one fixed side and one free side, simply supported along the other two opposite sides. Then, by equating the contraction along the chord subtending the deflected free side of the plate to the former contraction and calculating the corresponding uniform load on the plate to the contraction, the radial stress at the lower end of the rim-wing and the outward deflection of the upper end of the rim-wing were obtained.The results of this analysis well agreed with those of the experiment and predicted the same condition of the rupture of a full-size sheave as that obtained by the experiment. Thus, the above analytical consideration proved to be important for the design of such a head-sheave.
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