关键词: 宣纸, 蠕变, 松弛, 流变学模型

Abstract: In this paper,the creep and relaxation of Xuan paper during the stretching process were studied. The results indicated that Burgers model could perfectly describe the creep of Xuan paper. Elastic,viscoelastic and plastic strain in the total creep respectively accounted for 62%～78%,17%～25%,and 4%～13%.At certain temperature and moisture,increased stress increases elastic,viscoelastic and plastic strain in the range of 0.2～0.8σ_max. Furthermore,the proportion of viscoelastic and plastic strain increased,while the proportion of elastic strain decreased. The effects of stress on the final proportion of strain decreased. Under the same tensile stress,creep of cross direction was less than that of longitudinal direction in the same paper. A five-element Maxwell model was effective to describe relaxation of Xuan paper. The parameters of five-element Maxwell model were slightly affacted by strain levels. So,these parameters could be regarded as constants.

Key words: Xuan paper, creep, relaxation, rheological model