A Finite Element Model Establishment Method of Chemically Tempered Glass Considering Residual Stress

Abstract

The invention discloses a chemically-tempered glass finite element model establishment method considering residual stress. The method comprises the steps that (1) a tampered glass geometric model is established, the geometric model is imported into Hypermesh, a shell unit and a hexahedron entity unit are adopted to divide meshes, and material parameters and tied contact are set; (2) an equivalentmodel of the shell unit is established and loaded, stress is output, then the equivalent model load is corrected to be F<c>, loading is performed again, a stress value is output, and an interpolationmethod is adopted to calculate an integral point stress value; (3) an entity unit equivalent model is established, F<c> is adopted to load the hexahedron entity unit, and stress values sigma<x> and sigma<y> in the x direction and the y direction at natural coordinates (0,0,0) of the hexahedron entity unit are calculated and output; and (4) after finite element calculation software is adopted to correct the stress values, the stress serves as initial stress. Through the method, initial stress loading time can be shortened, the probability that the calculation result is not converged is lowered,and the precision of the chemically-tempered glass finite element model is improved.

Description

technical field [0001] The invention relates to a method for establishing a chemically tempered glass finite element model considering residual stress, in particular to a method for establishing a finite element model with initial stress with higher precision. Background technique [0002] Tempered glass is a kind of strengthened glass that is made of ordinary glass through physical or chemical means, causing external pressure and internal tension. Tempered glass has a high mechanical bearing capacity and can withstand temperature changes above 250 degrees. At present, in terms of research and development of chemical toughened glass, companies such as Saint-Gobain of France, Asahi Glass of Japan, PPG of the United States and Corning have the highest research and development level; the research and development of chemical toughening in China mainly includes China National Building Materials Academy , Wuhan University of Technology and other institutions, they mainly research ...

AI Technical Summary

Problems solved by technology

If the tempered glass is simply discretized with larger-sized elements, the initial stress cannot be added correctly, and the calculation results will inevitably be inaccurate. If the micron-sized grid is used, the model will inevitably be too large to be calculated.

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