Finite element modelling of surface micromechanical behavior on chemically strengthened aluminosilicate glass

The surface damage resistance of chemically strengthened aluminosilicate glass is very important. The surface hardness and modulus are closely related to the damage resistance of glass. The micromechanical behaviors such as surface hardness and modulus of chemically strengthened aluminosilicate glass were analyzed by finite element method, and compared with the results of nanoindentation experiment. The results show that the load displacement curve of nanoindentation calculated by finite element method is in good agreement with the experimental results. According to the load displacement curve obtained by finite element simulation, Oliver and Pharr method was used to calculate the hardness and Young’s modulus. The calculated results are very close to the experimental values. The relationship between the yield strength of aluminosilicate glass and the stress-strain in the plastic region calculated by Larsson’s plastic formula is used in the simulation process. The simulation results are in good agreement with the experimental results, which indicates that the accuracy of the plastic parameters of aluminosilicate glass obtained by Larsson’s plastic formula is high. Finally, according to the stress distribution obtained by finite element simulation, the elastic-plastic deformation behavior of aluminosilicate glass before and after chemical strengthening was analyzed. The results show that the surface compressive stress layer produced by chemical strengthening has more influence on the elastic zone of aluminosilicate glass, but has less influence on the plastic zone.