二本桁片持翼の強さに關する二三の實験
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概要
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A cantilever wing composed of two spars, ribs, a special rib, a box-rib at the wingroot, a stiff end rib and drag bracing, and covered with doped fabric, was load-tested for the purpose of determining the amount of contribution of these members to the stiffness of the wing. The wing was attached to the testing tower in our Institute, and the deflections at eight points on the each spar were measured with dumpy levels set horizontally on the floor, and by reading the millimeter scales attached to the points. The wing was firstly tested in complete condition, then fabric was stripped off, the special rib was cut, the drag bracing was removed successively and lastly the normal ribs were cut. In each case, it was loaded with a single load on either front or rear spar at the point of attachment of the end rib, then it was loaded on both spars and adjusting the amount of loads the deflections of the two spars were made equal. By this method, the effects of the various members on the torsional stiffness of the wing, especially the binding effect of ribs and the effect of the doped fabric, were determined. The materials used in the spars were tested for tension and compression, and the fabric for shear by specially designed testing apparatuses, and the moduli concerning to these characteristics were obtained. The results of calculations using these figures and that of experiments were compared and discussed.
- 社団法人日本船舶海洋工学会の論文
- 1933-10-20
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