宣纸流变模型的研究  

Study on Rheological Model of Xuan Paper

作　　者：高慧[1] 邵卓平[1] 

机构地区：[1]安徽农业大学林学与园林学院,合肥230036

出　　处：《林业科学》2008年第10期113-119,共7页Scientia Silvae Sinicae

基　　金：国家自然科学基金(30571452);安徽农业大学创新团队资助

摘　　要：以宣纸为研究对象,研究其在张力状态下的蠕变和松弛行为。结果表明:采用伯格斯(Burgers)四元件模型能够很好地描述宣纸的蠕变行为,其拉伸蠕变包括弹性变形、黏弹性变形和塑性变形。在总应变中,弹性应变占62%～78%,黏弹性应变占17%～25%,塑性应变占4%～13%。在一定温度和湿度下、在0.2～0.8σmax载荷范围内,弹性应变、黏弹性应变和塑性应变在总体上均随着应力水平增大而相应增加,但弹性应变所占的比例逐渐减小,黏弹性应变和塑性应变所占的比例逐渐增大,最后都趋于稳定。在相同拉应力下,同一张宣纸横向的蠕变小于纵向。利用2阶5参数的Maxwell五元件模型可以描述宣纸的松弛行为,五个元件参数在不同应变水平下变动不大,基本上可视为材料的常参数。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 - 0.8 σ 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.

关 键 词：宣纸 蠕变 松弛 流变学模型 

分 类 号：TS766[轻工技术与工程—制浆造纸工程]