Elementary Study On The Damage Mechanics Of Papersheet

The damage mechanics of papersheet is a new researching field combining the damage theory with classic mechanics. This thesis had applied the damage mechanics theory to setup the relationship between the paper's structure and the damage mechanics of paper.Firstly, the relationship between the relative bonded area and the mechanic properties of papersheet had been studied. Because the weak link in the papersheet is the linkage among fibers, enhancing the linkage can greatly improve the strength of papersheet and ameliorate the structure properties of that.Secondly, the relationship between the fiber's properties and the mechanic properties of papersheet had been studied. The length and strength of fibers that are composed of papersheet are pretty important to the strength of papersheet.Synthesize those two main aspects mentioned above, this thesis takes paper as a stochastic network of fibers, with the defects and high porous. According to the damage theory and considering the papersheet's structure, study the damage caused by the structure's defects of papersheet itself quantitatively. That is different from the process damage caused by the applied force. We can use the varied strength indices of papersheet to define this kind of damage.This thesis also had studied how the porous affect the structure and mechanic properties of papersheet, and used the elastic modulus to define the damage caused by the porous.The three ways of the creep failure of the papersheet in the constant tensile loads are described in this article. The creep ways include the creep of elastic failure, the creep of plastic failure, the creep of elastoplastic failure. The above mechanical theories are primary verified by experimental data.