钢化真空玻璃在温差作用下的变形特征

钢化真空玻璃两侧存在温差是导致其弯曲失效的重要原因之一。通过钢化真空玻璃温差变形试验和数值模拟,得到不同尺寸的钢化真空玻璃(5+0.5V+5)在不同温差下的变形特征。结果表明:钢化真空玻璃受两侧温差形成的球面弯曲曲率半径与钢化玻璃基片的厚度成正比,与钢化玻璃基片的线膨胀系数及两侧温差成反比;钢化真空玻璃的变形量与钢化玻璃基片尺寸、温差大小及曲率半径呈正相关;同一温差下钢化真空玻璃变形量随长边尺寸增大而增大;数值模拟结果与试验结果吻合,相对误差在5%以内,能够为不同尺寸钢化真空玻璃在温差下的变形预测提供参考。

Deformation Characteristics of Tempered Vacuum Glass under Temperature Difference

The temperature difference between two sides of tempered vacuum glass is one of the important reasons for its bending failure. The deformation characteristics of tempered vacuum glass (TVG) were tested at various temperature difference and in various diameters, and determined by temperature difference deformation tests and finite element modelin (FEM) analysis. The findings demonstrate that the maximum deformation of TVG is in the center of the glass and gradually decreases to the periphery. Curvature radius of the sphere created by temperature difference between two sides of TVG is directly proportional to the thickness of the tempered glass, but inversely proportional to temperature difference between the two sides as well as to the linear expansion coefficient of glass. Glass size, temperature difference and curvature radius are all positivly correlated with the deformation of TVG. With the same temperature difference and different size of TVG, its deformation increases with the increase of the long side size of tempered glass. The larger the long edge size of TVG, the more significantly the deformation is affected by temperature difference. Moreover, a useful approach for the deformation prediction of TVG with different diameters under temperature difference is provided by the FEM analysis results, which is in good agreement with the experimental findings and where the relative error is less than 5%.