曲率对PE管材环向拉伸强度的影响

选用环向拉伸试验的方法对高密度聚乙烯（PE-HD）管材环向拉伸的强度进行检测，主要研究拉伸试样在试验进行过程之中曲率的改变对环向拉伸强度的影响，整个试验过程采取多个平行试样进行试验，用以取得准确的试验数据来确定试验结果，并就曲率对PE-HD管材环向拉伸强度影响的变化规律进行研究探讨。结果表明，同一外径的PE-HD管材，随着环向拉伸试样在试验中曲率的减小，环向拉伸强度数值减少可达10 %。

Effect of Curvature on Circumferential Tensile Strength of PE Pipes

In this paper， a hoop tensile test method was adopted to detect the hoop tensile strength of high-density polyethyene （PE-HD） pipes， and the effect of the change of curvature caused by the deformation of the sample on the hoop tensile strength was investigated during the test. In the experiment， the optimized parallel tests were carried out to obtain accurate test data. After the collection of the huge amount of test data， the results indicated that for the PE-HD pipes with the same outer diameter， their hoop tensile strength decreased by 10 % with a reduction of the curvature of hoop tensile specimen under the test. Moreover， the effect of the variation law of curvature on the hoop tensile strength of PE-HD pipes was discussed.