Abstract
The loop strength of nylon guts and soft stainless steel filaments was measured and the relation between it and the load-elongation curve in simple tensile test was investigated. The results obtained are as follows:1. The loop strength of samples used increases with increasing the diameter ratio. The degree of increase is dependent upon the tensile breaking strain of samples.2. The following experimental equations were obtained for nylon guts: Δe=eemo……(a), emo=1/(1+erγdo)……(b) where Δe is the decrease of strain which is defined as the difference between the tensile breaking strain and its teesile strain at the breaking point in the loop test, emo is geometric bending strain calculated from the micrographs of the hooked part, γdo is diameter ratio, and e and er are constants independent of the diameter ratio. Therefore, the loop strength for a given diameter ratio can be estimated from both the above equations and their load-elongation curves obtained by simple tensile tests.
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