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As part of the study on the distribution of stress on a fishing net, the tension distribution on the net under impact loads were measured with the strain gauge. The results obtained were as follows: 1) When impact load is vertically imposed on a knot of a net, the shape of tension distribution is as shown in Fig. 1 (A), and when impact load is imposed in a direction parallel to a net, it is as shown in Fig. 1 (B and C). 2) If the tension which appears on the leg line starting directly from the point loaded is denoted by T, the following equation will be held, T/mv=Kt+Kaexp{-k(n-1)} where Kt=t/mv, Ka=a/mv; t is the tension still remained when it attenuates gradually till it approaches nearest to the constant value, a is the tension of the first leg minus t, k is the attenuation coefficient, mv is the impact load and n is the number of legs from the point loaded. In the present study, obtained coefficients Kt, Ka, and k among sample nets of various kinds of fibers are shown in Table 2. 3) The value of tension becomes larger as a net is stretched more tightly.

The Distribution of Stress on the fishing Net