Burst pressures of high-density polyethylene pipes considering the notch effect : testing and prediction

Zheng, Xiaotao and Wang, Jiqiang and Chen, Haofeng (2020) Burst pressures of high-density polyethylene pipes considering the notch effect : testing and prediction. Journal of Testing and Evaluation, 48 (6). ISSN 1945-7553

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    Abstract

    This work aims at testing and predicting burst pressures of high-density polyethylene (HDPE) pipes with various groove conditions. Four types of notches, including U-type, V-type, lineartype (L-type), and rectangular-type (R-type) notches, with different depth ratios are discussed. A unified damage model is proposed to predict the damage behaviors of notched HDPE pipes for different notch shapes. Results indicate that the notch shape has an important influence on the burst pressure of HDPE pipes. Generally, the notch types ordered by impact extent from highest to lowest are R-type, U-type, V-type, and L-type, according to the experimental data. The burst pressure obviously decreases with the increment of the notch-depth ratio. However, when the notch depth is less than 0.5 mm in this work, the burst pressure reduces slightly compared with that of the virgin pipe because of its good fracture toughness. Moreover, the predicted damage factors given by the proposed model agree very well with the experimental data under different groove shapes. This work provides important experimental data and damage assessment approaches for various notched HDPE pipes.