摘要
为研究聚酰亚胺薄膜的蠕变黏弹性本构关系模型,选用厚度25μm的聚酰亚胺膜材料,初始应力选取极限抗拉强度的50%,在23、 50、 80、 110、 140、 170℃下进行单轴蠕变拉伸实验,分析不同温度下膜材料蠕变的变化规律.用经典Kelvin、经典Maxwell、 Burgers、三参数广义Kelvin、五参数广义Kelvin蠕变本构模型对数据进行拟合,分析拟合效果.结果表明,聚酰亚胺膜材料具有明显的黏弹性,初始应力对聚酰亚胺膜材料的蠕变性能影响显著,初始应力越大,黏弹性越明显.五参数广义Kelvin模型能够较好地预测聚酰亚胺膜材料的蠕变性能,可决系数均超过0.98,Burgers模型次之,其余3种模型的拟合可决系数为0.708~0.958,拟合结果满足实际工程需要.
In order to study the creep viscoelastic constitutive relation model of polyimide film,with a thickness of 25 μm was selected,and the initial stress was 50% of the ultimate tensile strength.The uniaxial creep tensile test was carried out at six temperatures of 23,50,80,110,140 and 170 ℃,and the creep variation of the film at different temperatures was analyzed.Five creep constitutive models of classical Kelvin,classical Maxwell,Burgers,three-parameter generalized Kelvin and five-parameter generalized Kelvin were used to fit the experimental data,and the fitting effects of each model compared and analyzed.The results showed that the polyimide membrane had obvious viscoelastic properties.The initial stress had a significant effect on the creep properties of the polyimide membrane.The greater the initial stress,the more obvious the viscoelasticity.The five-parameter generalized Kelvin model could well predict the creep properties of the membrane,and the coefficient of determination was more than 0.98.The Burgers model was followed and the fitting coefficients of other models were between 0.708 and 0.958.The fitting results could meet the needs of practical engineering.
作者
武艳如
薛鑫媛
何佳佳
邢妮
刘岩
WU Yan-ru;XUE Xin-yuan;HE Jia-jia;XING Ni;LIU Yan(School of Architectural Engineering,Chang'an University,Xi'an 710061,China)
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2024年第3期387-394,共8页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金青年基金项目(51908043)。
关键词
聚酰亚胺薄膜
黏弹性力学
蠕变性能
蠕变本构模型
polyimide film
viscoelastic mechanic
creep performance
creep constitutive model
