索具類の安全使用力算定の近似式について

概要

論文の詳細を見る
Generally, the safety working load for various ropes has been given by a formula, W=(D/8)2C, where, D is the diameter in mm and C is the constant which varies with the sort of the rope materials. Recently, the Japanese Industrial. Standard (JIS) for various ropes has been corrected frequently with the development of the manufacturing techniques of ropes and also of materials themselves. Then it was considered that C up to date in the above formula should be reexamined and new approximating formulae should be given. Hence, the new values of C into the above formula based on the standards of JIS were reset for various ropes of different materials and some approximating formulae applied with the least square method were examined. Among several forms of the formulae, an exponent equation, W=aDc and a cubic equation were taken into consideration, since linear and quadratic equations were not satisfactory in accuracy, and higher degree equations were quite accurate but they were difficult to solve in practical use. Various series of C were given respectively to the new formulae of various materials. The respective ratio of strength of various materials against that of the wire-rope in the same size was 1/8 for manila rope, 1/3 for nylon, 1/6 for vinilon, 1/5 for polyethilene and 1/5 for polypropylene.
長崎大学水産学部の論文
1976-08-00