玻璃纤维增强塑料电缆导管环向拉伸强度的测量及不确定度评定

Measurement and Uncertainty Evaluation of Circumferential Tensile Strength of Glass Fiber Reinforced Plastic Cable Conduit

以编织缠绕拉挤(BWFRP)玻璃纤维增强塑料电缆导管为研究对象,建立了环向拉伸强度测量不确定度的数学模型,根据DL/T 802.2-2017测定样品环向拉伸强度,探讨了破坏载荷、数值修约、试样宽度和试样厚度等参数对测定结果的影响。结果表明:影响环向拉伸强度测量结果的最主要因素是破坏载荷测量重复性,适当增加试验次数可减少因测量重复性引起的不确定度,是提高测量准确性的关键;当玻璃纤维增强电缆导管拉伸强度为273.3MPa时,其扩展不确定度为10.7MPa(包含因子k=2)。

A mathematical model of the uncertainty of the measurement of the circumferential tensile strength of the braided winding pultrusion glass fiber reinforced plastic cable conduit was established.The circumferential tensile strength of the sample was measured according to DL/T 802.2-2017.The influences of failure load,numerical modification,sample width and thickness on the measurement results were discussed.The results show that the most important factor affecting the measurement results of circumferential tensile strength is the repeatability of failure load measurement.Increasing the number of tests appropriately can reduce the uncertainty caused by the repeatability of measurement,which is the key to improve the accuracy of measurement.When the tensile strength of glass fiber reinforced cable conduit is 273.3MPa,its expansion uncertainty is 10.7MPa(including k=2).