汽车前挡风玻璃预加热段多物理场建模与凹陷机理分析OA

To investigate the formation mechanism of central sagging in glass during the preheating stage of the glass forming process and the effects of two geometric parameters of glass thickness and aspect ratio,the numerical model of the fluid-thermal-structural coupled multiphysics was established based on the process flow of industrial preheating furnace.The high-temperature infrared thermography was employed to obtain the surface temperature distribution of the glass at the end of the preheating stage for verifying the fluid-thermal coupled numerical model.The developed fluid-thermal-structural coupled multiphysics model was used to simulate the formation process of central sagging during preheating for elucidating the underlying deformation mechanism.The effects of the two geometric parameters on glass sagging deformation were systematically investigated.The results indicate that geometric parameters play a critical role in glass deformation.The thinner glass exhibits more severe central sagging due to the reduced bending stiffness.The aspect ratio significantly affects the deformation behavior.When the aspect ratio is decreased from 6.32 to 1.58,the sagging depth is increased from 4.65 mm to 9.34 mm,which is attributed to the expansion of thermal strain region in the transverse direction.