網系の繰返し衝撃による疲れ

概要

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To investigate some fatigue properties of netting twines as shown in Table 1, the pre-sent experiments were carried out making use of the apparatus as shown in Fig. 1. Various values measured are shown in Table 1. Breaking strength has no effect with increase of impact loads and repeated times in Amilan, Cremona and Polyethylene except the case of impact load. 75kg with repeated 700 times in Polyethylene (Table 1). Breaking energy has no effect with increase of repeated impact times in Amilan and Cremona but it decreases with the repeated times increasing when the impact load is over. 75kg in Polyethylene. The author examined by the method of t-test whether among mean values of breaking energy some difference are found or not. Breaking energy has no effect in accordance with increase of the impact load in Amilan but decline of decrease in Cremona and Polyethylene (Table 3). As the mean values in elongation are applied to know the elongation resulted from impact loads, the elongation increases in accordance with increase of the impact load (Table 5 and Fig. 2). The relations between Δl and maximum and measured values of Δl are shown in Fig. 3. It is generally recognized that breaking elongations of the twines decrease under the im-pact loads.
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