On the Rheology of Netting Twine-V

4 Element Model

Abstract

E₁ Since the values of vinylon are considerably larger than those of other materials, an elongation for instantaneous load for vinylon is rather difficult to obtain. Also, as its average ratio of change is larger than that of other materials for the same number of single yarns n to E₁, vinylon is considered to be most affected by the twisht.
E₂ From the shape of the curves for E₂ and n for long-time loading, these materials can be divided into two groups namely, nylon, polyethylene and vinylon, polyester. Polyethylene is seen to be easily elongated to about 3-4 times more than nylon. η₁ A decrease in the fluidity of the twine is caused with an increase in n, and this effect is the same for all 4 materials. The fluidity of polyethylene is 5-7 times greater than those of the other 3 materials. η₂ From the relation between η₂ and n, two groups are seen to be formed. Namely, nylon, polyethylene and vinylon, polyester, as was in E₂ and these show the same behaviour pattern for n under long-time loading. The latter group is found to be affected to a greater extent than the former group by n, which in turn is affected by the twist. Polyethylene shows a fluidity that is 4 times greater than that for nylon in the same group. Considering these facts, nylon and polyethylene, amongst the 4 materials, are seen to show a rapid response, whereas the one with the shlowest response is vinylon, for instantaneous tensile loading. In the creep behaviour tests, while under a loong loading period polyethylene shows the most fluid elongation.