In this article, a shape memory alloy wire is employed as confinement to enhance the flexural rigidity of the butt-fusion welded joints in the high-density polyethylene pipes. To this end, analytical and experimental studies are considered, when the shape memory alloy wire is wrapped around a butt-fusion joint and an internal pressure is applied to the high-density polyethylene pipe. To investigate the efficiency of shape memory alloy wire jacket on the performance of butt-fusion welded joint in high-density polyethylene pipe, two cases of perfect butt-fusion joint and imperfect butt-fusion joint are tested. The influence of the number of shape memory alloy wire jacket on the high-density polyethylene pipe joints as well as the effect of different flexural rigidities of the wire and high-density polyethylene pipe, and different diameters are evaluated. The deformation is measured using linear voltage displacement transducer and digital image correlation analysis at different location of the pipe length. In addition, radial strain of the pipes due to bulging is measured by electronic resistance strain gauges. Results show that the shape memory alloy wire jacket has a significant effect (33%) on enhancing imperfect butt-fusion welded joint of high-density polyethylene pipes.

中文翻译：

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形状记忆合金增强对高密度聚乙烯管对接焊缝性能的分析与试验研究

在本文中，采用形状记忆合金丝作为约束，以提高高密度聚乙烯管道中对熔焊接接头的抗弯刚度。为此，考虑了分析和实验研究，当形状记忆合金线缠绕在对接熔接接头上并向高密度聚乙烯管施加内部压力时。为研究形状记忆合金丝护套对高密度聚乙烯管材对焊接头性能的影响，对完美对接和不完美对接两种情况进行了测试。形状记忆合金钢丝护套数量对高密度聚乙烯管接头的影响以及钢丝和高密度聚乙烯管不同抗弯刚度的影响，并评估不同的直径。使用线性电压位移传感器和数字图像相关分析在管道长度的不同位置测量变形。此外，通过电子电阻应变计测量由于鼓胀引起的管道径向应变。结果表明，形状记忆合金丝护套对增强高密度聚乙烯管道不完美对接熔焊接头有显着效果（33%）。