中国塑料 ›› 2021, Vol. 35 ›› Issue (4): 65-71.DOI: 10.19491/j.issn.1001-9278.2021.04.012

• 加工与应用 • 上一篇    下一篇

高密度聚乙烯管热熔焊接接头本构模型研究

赵兴民1, 赵建平1(), 燕集中2   

  1. 1.南京工业大学,南京 211816
    2.江苏省特种设备安全监督检验研究院,南京 210036
  • 收稿日期:2020-09-03 出版日期:2021-04-26 发布日期:2021-04-21
  • 基金资助:
    江苏省特种设备安全监督检测研究院项目(KJ(Y)2016017)

Study on Constitutive Model for Butt Fusion Welded Joint of High⁃density Polyethylene Pipe

ZHAO Xingmin1, ZHAO Jianping1(), YAN Jizhong2   

  1. 1.Nanjing Tech University,Nanjing 211816,China
    2.Jiangsu Special Equipment Safety Supervision and Inspection Institute,Nanjing 210036,China
  • Received:2020-09-03 Online:2021-04-26 Published:2021-04-21
  • Contact: ZHAO Jianping E-mail:jpzhao_njtech@163.com

摘要:

采用实验方法研究高密度聚乙烯(PE?HD)热熔焊接接头区域的材料性能与管材本体的差异。按照ISO 21307标准方法形成热熔焊接接头后,去除内外卷边,设计接头取样方式并改进拉伸试样。通过不同应变率下管材和焊接接头的单轴拉伸试验,使用一种新的本构分析方法与Suleiman方法研究其本构模型差异,得到了模型参数随应变率变化的非线性关系。对比模型预测结果和试验结果,验证了非线性拟合本构模型的有效性和合理性,同时该模型可预测低应变率下(准静态)的应力应变曲线。结果表明,PE?HD焊接区域的弹性模量和屈服应力优于管材,但差别不明显。

关键词: 高密度聚乙烯, 管, 热熔焊接, 本构模型, 应力?应变

Abstract:

This paper reported an investigation on the material performance difference between the butt fusion welded joint and pipe body of high-density polyethylene (PE-HD) through an experimental method. With the formation of the butt fusion welded joint according to the ISO 21307 standard method, the inner and outer crimps were removed, and the joint sampling method was design to improve the tensile specimen. A new constitutive analysis and a Suleiman method were used to study the difference of constitutive models through the tensile testing of pipes and welded joints at different strain rates. The nonlinear relationship between model parameters and strain rate was obtained. Through comparing the model prediction and test results, the effectiveness and rationality of the nonlinear fitting constitutive model were verified. The model can predict the stress-strain curve under a low strain rate, providing a basis for engineering practice and finite element analysis. The results indicated that the elastic modulus and yield stress of the PE-HD welding area were better than the pipe, but the difference was not obvious.

Key words: high-density polyethylene, pipe, butt fusion welding, constitutive model, stress-strain

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