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首页> 外文会议>American Society of Civil Engineers(ASCE) International Conference on Pipeline Engineering and Construction v.2; 20030713-20030716; Baltimore,MD; US >Accelerated Creep Testing of Trenchless Liners
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Accelerated Creep Testing of Trenchless Liners

机译：无沟槽衬里的加速蠕变测试

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摘要

Physical ageing of commercial polymers used in trenchless relining of sewer pipes has been investigated. The analysis uses modified effective-time theory (ETT) and time-temperature superposition (TTSP) methods. The data generated by this study show that the time-dependent creep properties of these materials can be modeled within experimental error with changes to the methods reported in the literature. It is shown that a rotation, along with a horizontal shift of the ageing data, is needed to obtain the ageing parameter of the materials. Temperature has no effect on the ageing shift rate. The TTSP is shown to be an accurate method for determining the shift factors to adjust creep data for temperature changes. A novel method is presented to predict the creep behavior of full-scale specimens. The method relies on novel procedures to generate and shift the TTSP master curve from the reference testing age and reference temperature to the testing age and temperature of the full-scale specimens.
机译：已经研究了用于下水道无衬里衬里的商用聚合物的物理老化。该分析使用改进的有效时间理论（ETT）和时间-温度叠加（TTSP）方法。这项研究产生的数据表明，这些材料随时间变化的蠕变特性可以在实验误差范围内进行建模，方法是改变文献中报道的方法。结果表明，需要进行旋转以及时效数据的水平移动才能获得材料的时效参数。温度对老化速率没有影响。 TTSP被证明是确定位移因数以调节温度变化的蠕变数据的准确方法。提出了一种新颖的方法来预测全尺寸试样的蠕变行为。该方法依赖于新颖的程序来生成TTSP主曲线并将其从参考测试年龄和参考温度移至满刻度样品的测试年龄和温度。

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