中国塑料 ›› 2022, Vol. 36 ›› Issue (9): 63-69.DOI: 10.19491/j.issn.1001-9278.2022.09.010

• 加工与应用 • 上一篇    下一篇

基于循环载荷试验的聚乙烯管材寿命预测研究

杨波1(), 杨圳2, 曾辰3, 王志刚1(), 翟伟1, 曹福想4   

  1. 1.广州特种承压设备检测研究院,广州 510663
    2.中国质量认证中心广州分中心华南实验室,广州 510663
    3.湘潭大学土木工程与力学学院,湖南 湘潭 411105
    4.广东省特种设备检测研究院佛山检测院,广东 佛山 528251
  • 收稿日期:2022-04-25 出版日期:2022-09-26 发布日期:2022-09-26
  • 通讯作者: 王志刚(1989—),男,工程师,主要从事聚乙烯燃气管道检验检测等研究工作,orinwang8851@163.com
    E-mail:boycs@126.com;orinwang8851@163.com
  • 作者简介:杨波(1983—),男,高级工程师,主要从事聚乙烯燃气管道失效分析与寿命评估研究工作,boycs@126.com
  • 基金资助:
    广东省省级科技项目(2021B1111600002);国家市场监督管理总局科技项目(2020MK128)

Lifetime prediction of polyethylene pipe based on cyclic load

YANG Bo1(), YANG Zhen2, ZENG Chen3, WANG Zhigang1(), ZHAI Wei1, CAO Fuxiang4   

  1. 1.Guangzhou Special Pressure Equipment Inspection and Research Institute,Guangzhou 510663,China
    2.Canton Branch,China Quality Certification Centre,Guangzhou 510663,China
    3.College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China
    4.Guangdong Institute of Special Equipment Inspection and Research Foshan Branch,Foshan 528251,China
  • Received:2022-04-25 Online:2022-09-26 Published:2022-09-26
  • Contact: WANG Zhigang E-mail:boycs@126.com;orinwang8851@163.com

摘要:

采用循环载荷裂纹圆棒(CRB)试验,测试了A~C 3种聚乙烯(PE)材料在载荷比(R)分别为0.1、0.3和0.5时,缺口圆柱棒试样的裂纹扩展速率(da/dt)与应强度因子(KI)的对应关系。通过结合聚合物材料线弹性断裂力学理论,外推至R=1(静载)条件,得到含缺陷PE管材的使用寿命(tf),并与全缺口蠕变试验(FNCT)评价结果进行了对比分析。结果表明,当A~C 3种PE管材内壁存在aini=0.4 mm的初始裂纹缺陷时,CRB试验外推得的管材的tf分别为44、53和65年;FNCT外推结果分别为53、59和79年;CRB和FNCT的寿命预测结果具有较好的正相关性,寿命预测结果偏差较小,试验结果证实了该方法的有效性。

关键词: 聚乙烯管, 循环载荷裂纹圆棒试验, 全缺口蠕变试验, 寿命预测

Abstract:

In this paper, a cyclic loading circular bar (CRB) test was conducted to measure the corresponding relationship between the crack growth rate da/dt and stress factor KI of three types of PE materials A, B and C at loading ratios of R=0.1, 0.3 and 0.5, respectively. Through using the theory of linear elastic fracture mechanics of polymer materials in the condition by extrapolating to R=1 (static load), the failure time tf of PE pipes with defects was obtained. The results were compared with those obtained form full notch creep test (FNCT). When there was an initial crack defect at aini=0.4 mm on the inner wall of the three PE pipes, the failure lifetimes of extrapolated tubes obtained from the CRB test were 44, 53 and 65 years for the PE pipe A, B and C, respectively. The extrapolating results of FNCT were 53, 59 and 79 years for the PE pipe A, B and C, respectively. The test results indicated that the lifetime prediction results of CRB and FNCT had a good positive correlation, and their deviation was small. The experimental results confirmed the availability of the method.

Key words: polyethylene pipe, cyclic loading crack round bar test, full notch creep test, lifetime prediction

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