| With the development of modern industry, a lot of materials are working at high temperature. The property of materials and the distribution of stress change with the influence of temperature and time. Therefore, creep of materials must be considered.Automotive glass manufactured from flat glass is widely used in the automobile industry. First, the flat glass is heated to a molten state in hot bending stove. Then, the glass is shaped by forming machine in according to requirement. Molten glass will creep during the forming process, which can affect the quality of automotive glass directly. However, it's significant to research the creep phenomenon of automotive glass.The experiments of uniaxial creep for car glasses at high temperatures and different stress levels are conducted, revealing the characteristics of nonlinear deformation. Under different temperature and loadings,the creep curves have similar shape. It's observed that, at 550 o C~590 oC , the primary creep is not obvious, while the steady creep and the accelerating creep processes are dominant. And, the fracture data follow the Monkman-Grant relationship, not influenced significantly by temperature and stress. On the experiments, structure factor is considered into the strain rate, then, acceleration stage is built by fracture time and structure factor, at last, the paper presents a nonlinear uniaxial constitutive equation to describe the creep of glasses. By theoretical computation, it's found that the nonlinear uniaxial constitutive equation proposed in this paper can describe the creep process of car glasses at high temperatures. |
