上海交通大学学报 ›› 2019, Vol. 53 ›› Issue (5): 513-520.doi: 10.16183/j.cnki.jsjtu.2019.05.001

• 学报(中文) •    下一篇

有机玻璃观察窗的蠕变特性及数值模拟

郭大猷1,黄小平1,王芳2   

  1. 1. 上海交通大学 高新船舶与深海开发装备协同创新中心, 上海 200240; 2. 上海海洋大学 上海深渊科学工程技术研究中心, 上海 201306
  • 出版日期:2019-05-28 发布日期:2019-05-28
  • 通讯作者: 黄小平,男,副教授,电话(Tel.):021-34207009;E-mail: xphuang@sjtu.edu.cn.
  • 作者简介:郭大猷(1994-),男,辽宁省大连市人,硕士生,现主要从事结构物强度与疲劳研究.
  • 基金资助:
    国家自然科学基金重点项目(51439004),国家自然科学基金面上项目(51679133)

The Creep Properties and Numerical Simulation for PMMA Window

GUO Dayou,HUANG Xiaoping,WANG Fang   

  1. 1. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Shanghai Engineering Research Center of Hadal Science and Technology, Shanghai Ocean University, Shanghai 201306, China
  • Online:2019-05-28 Published:2019-05-28

摘要: 传统的线弹性模型在模拟载人深潜器的有机玻璃(PMMA)观察窗蠕变变形时表现出严重的局限性,为解决这一问题,构建了Prony级数形式的线性黏弹性本构模型.采用质量缩放技术和等效时长方法加快了显式动力有限元计算过程,得出了稳定且与实验数据接近的计算结果.结果表明:在常温、高应力、逐步加压的作业环境下,PMMA在加载阶段就已经表现出黏弹性行为.因此,为了保证安全,必须要在整个加压-保载过程中考虑黏弹性效应.结合准静态加载的条件,采用显式动力学分析取代传统的静态分析,与PMMA黏弹性的时变特性相适应.此外,针对观察窗模型局部应力集中的问题,设置倒角可以有效降低局部应力,有限元计算时网格收敛性也更好.

关键词: 载人潜器, 有机玻璃, 观察窗, 蠕变, 黏弹性

Abstract: The traditional linear elastic model demonstrates large limitation to simulate the creep deformation of the polymethyl methacrylate(PMMA) observation window on human occupied deep-sea vehicle. A linear viscoelastic constitutive model was built based on Prony series form. The mass scaling method together with the equivalent duration method was introduced to accelerate FEM analysis. The numerical-simulation results showed much stability and fitted well with test data. It was concluded that PMMA window showed viscoelastic behavior when loaded gradually to a high level at room temperature. So the viscoelasticity must be considered during a whole loading-holding process. Under quasi-static condition, traditional static FEM was replaced by dynamic explicit FEM which is adaptive to the time-varying property of PMMA viscoelasticity. It was also found that a fillet could help prevent local stress concentration and improve grid convergence.

Key words: deep-sea manned submersible, polymethyl methacrylate (PMMA), observation window, creep, viscoelasticity

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