文摘
In this paper, the creep and relaxation behaviors of Xuan paper during the stretching process were studied. The results indicated that Burgers model could describe the creep behavior of Xuan paper perfectly including elastic deformation, viscoelastic deformation and plastic deformation. For the total creep, elastic strain, viscoelastic strain and plastic strain accounted for 62–78, 17–25, and 4–13 %, respectively. At a certain temperature and humidity, elastic strain, viscoelastic strain and plastic strain increased with the increase in stress in the range of 0.2–0.8σ max, and the proportion of viscoelastic and plastic strain increased, but the proportion of elastic strain decreased. Further, the proportion of each strain tended to be stable at last. A five-element Maxwell model could describe the relaxation of Xuan paper effectively. There were few influences on the parameters of five-element Maxwell model by strain levels, so these parameters could be regarded as material constants.