玻璃/亚麻纤维混杂复合材料的吸湿和动态粘弹性性能研究

STUDY ON MOISTURE ABSORPTION AND DYNAMIC VISCOELASTICITY OF GLASS/FLAX FIBER HYBRID COMPOSITES

建立了玻璃纤维/亚麻纤维混杂复合材料层合板的吸湿模型以及湿动态粘弹性模型。采用一般的质量扩散模型分析混杂复合材料层合板的不同湿扩散特性,采用三元件模型模拟混杂复合材料层合板的湿粘弹性,模型参数通过热机械动力学分析(DMTA)实验测定,引入吸湿增重率-时间等效原理,分析不同吸湿量下混杂复合材料层合板的复刚度,研究发现在吸湿早期阶段,混杂复合材料层合板(GFFG)吸湿过程是非Fick的,混杂复合材料层合板(FGGF)满足Fick湿扩散定律,当M_t为0～0.037时,混杂复合材料层合板([0°F/90°G]_s)的储能抗弯刚度降低梯度比较大,在100 Hz以后,储能抗弯刚度增长放缓。本文所建立的模型能反映出试验观测到的规律。

The moisture absorption model and wet viscoelasticity of glass fiber/flax fiber hybrid composite laminates were established. The wet diffusion characteristics of hybrid composite laminates are analyzed by the general mass diffusion model. The wet viscoelasticity of hybrid composite laminates is simulated by three element model. The model parameters are measured by the thermal mechanical dynamics analysis (DMTA). Based on the principle of relative wetting weight gain time equivalence, the complex stiffness of hybrid composite laminates under different moisture absorption is analyzed.It is found that the process of absorption moisture of hybrid composite laminates (GFFG) is non Fick at the early stage of absorption moisture, and the hybrid composite laminates (FGGF) satisfy the Fick′s law of wet diffusion. When Mt is at 0~0.037, the gradient of the storage flexural stiffness of the hybrid composite laminates is larger than that of the composite laminates, and the increase of the storage flexural stiffness tends to be slow after 100 Hz. The model established in this paper can reflect the laws observed experimentally.