基于WLF方程和陈化理论推导符合时温等效关系的蠕变本构方程，开展不同温度下的试样压缩蠕变试验，拟合得到有机玻璃的压缩蠕变本构关系，应用有限元方法探究深海装备观察窗蠕变变形的时温等效现象。试验结果显示，符合WLF方程的陈化理论蠕变本构关系能较好地描述深海工况下的有机玻璃压缩蠕变行为；外加应力一定时，有机玻璃在4℃时的蠕变应变-时间曲线相当于将40℃时的蠕变应变-时间曲线沿时间轴拉伸9.36倍，该等效关系可为深海服役环境下有机玻璃耐压结构的加速蠕变试验设计提供参考。
Based on the WLF equation and aging theory, the creep constitutive equation conforming to time-temperature equivalent relation was derived. Compressive creep tests of specimens were carried out at different temperatures, and the compressive creep constitutive relation of polymethyl methacrylate(PMMA) was fitted. The time-temperature equivalent phenomenon of creep deformation of deep-sea equipments’ viewport windows was investigated by finite element method (FEM). The experimental results show that the creep constitutive relation of aging theory, which conforms to the WLF equation, can well describe the compressive creep behavior of PMMA under deep deep-sea conditions. When the applied stress is constant, the creep strain-time curve of PMMA at 4℃ is equivalent to 9.36 times of the creep strain-time curve at 40℃ along the time axis. This equivalent relationship can provide a reference for the accelerated creep test design of PMMA pressure structures under deep-sea service environment.
2024,46(17): 49-55 收稿日期：2023-11-6
DOI：10.3404/j.issn.1672-7649.2024.17.009
分类号：U674.941
基金项目：中国科学院冷泉装置前期关键技术攻关项目（LQ-GJ-01）
作者简介：陈薇(1993-),女,硕士,工程师,研究方向为深海装备耐压结构
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