網糸の強度が結節で減少する機構

Abstract

1) The decrease in strength of netting twines at the knot may be regarded to be due mainly to the frictional force or acting on the tip of the knot. The knot strength T may be given by T=T0/1+μ(s/ρ)eμθ, where T0 is the tensile strength of unknotted netting twines, μ the coefficient of friction between two netting twines forming a knot, s the contact length between the tip and the netting twine compressing it, ρ the radius of curvature of the compressing, and θ the angle at which the compressing rubs with another one in the vicinity of the opposite tip. 2) Knots are arranged in order of strength as follows: the reef knot pulled lengthwise ?? the sheet bend pulled breadthwise ?? the sheet bend pulled lengthwise ?? the reef knot pulled breadthwise.