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视黏弹性元件弹簧和粘壶的特性参数为时间的函数,建立双变参Maxwell模型,求解其本构方程及松弛函数,探讨了其松弛函数与经验KWW函数的关系,提出了一种新的应力松弛经验模型。运用最小二乘原理,建立该模型参数的确定方法。开展了玻璃纤维增强聚合物(GFRP)复合材料的长期应力松弛实验,并通过实验数据的分析验证了该模型的正确性。研究表明,新应力松弛经验模型拟合曲线与实测曲线吻合较好,相关系数达到96%以上,说明了该模型适合描述GFRP复合材料的黏弹性松弛特性。
Viscoelastic element spring and sticky kettle characteristics parameters as a function of time, the establishment of dual variable parameter Maxwell model, solving its constitutive equation and relaxation function, discussed its relaxation function and the relationship between the experience of KWW function, a new Stress relaxation model. Using the least square principle, the method of determining the model parameters is established. Long-term stress relaxation experiments of glass fiber reinforced polymer (GFRP) composites were carried out. The correctness of the model was verified by experimental data analysis. The results show that the fitted curve of the new stress relaxation empirical model is in good agreement with the measured curve, and the correlation coefficient is over 96%, which shows that the model is suitable for describing the viscoelastic relaxation properties of GFRP composites.