본 연구에서는 폴리에틸렌 배관 전기융착부 단기성능 평가를 위한 비파괴검사를 실시할 경우 발견되는 결함에 대한 판정기준을 개발하였다. 인위적으로 $3.8mm\~25mm$ 내에서 6가지 크기의 결함을 삽입한 시험 편을 설계 및 제작하여 기계적 평가를 실시하고 또 이론적 해석을 하였다. 안전계수 2를 적용하여 유효 응력을 산정할 경우 최대 허용 가능한 결함 크기는 11 mm(열선 폭의 $30\%$)이며 안전 계수를 4를 적용할 경우에 최대 허용 가능한 결함 크기는 3.8mm(열선 폭의 $10\%$)이다.
본 연구에서는 폴리에틸렌 배관 전기융착부 단기성능 평가를 위한 비파괴검사를 실시할 경우 발견되는 결함에 대한 판정기준을 개발하였다. 인위적으로 $3.8mm\~25mm$ 내에서 6가지 크기의 결함을 삽입한 시험 편을 설계 및 제작하여 기계적 평가를 실시하고 또 이론적 해석을 하였다. 안전계수 2를 적용하여 유효 응력을 산정할 경우 최대 허용 가능한 결함 크기는 11 mm(열선 폭의 $30\%$)이며 안전 계수를 4를 적용할 경우에 최대 허용 가능한 결함 크기는 3.8mm(열선 폭의 $10\%$)이다.
In order to investigate the short-term performance of polyethylene electrofusion joints, the mechanical tests and stress analysis have been conducted to the artificially defected weld joints. The defects of lack of fusion with a square-type were fabricated with 10, 20, 30, 40, 50, 60$\%$ ...
In order to investigate the short-term performance of polyethylene electrofusion joints, the mechanical tests and stress analysis have been conducted to the artificially defected weld joints. The defects of lack of fusion with a square-type were fabricated with 10, 20, 30, 40, 50, 60$\%$ size of the width of heat-ing wire zone, respectively. In this defect sires range, both tensile and bending test results showed the dependence of defect size to the electrofusion joints performance, but both sustained pressure and crush test results didn't. The numerical stress analysis results including the soil and internal pressures, tensile and bend-ing stresses clearly showed the dependence of fusion defect size. Based on both mechanical test and stress analysis results, the maximum acceptable defect size in polyethylene electrofusion joints is discussed.
In order to investigate the short-term performance of polyethylene electrofusion joints, the mechanical tests and stress analysis have been conducted to the artificially defected weld joints. The defects of lack of fusion with a square-type were fabricated with 10, 20, 30, 40, 50, 60$\%$ size of the width of heat-ing wire zone, respectively. In this defect sires range, both tensile and bending test results showed the dependence of defect size to the electrofusion joints performance, but both sustained pressure and crush test results didn't. The numerical stress analysis results including the soil and internal pressures, tensile and bend-ing stresses clearly showed the dependence of fusion defect size. Based on both mechanical test and stress analysis results, the maximum acceptable defect size in polyethylene electrofusion joints is discussed.
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