Finite element analysis investigating thermal stress characteristics and weight reduction design for perfectly flat CRT

For the perfectly flat CRT (PFCRT), corner cracking of the panel while passing through the exhaust furnace has been a long standing problem. These cracks frequently occur during the heat-up cycle for the evacuation in the exhaust furnace and originate on the corner of the inner surface of the panel. The transient stresses for the perfectly flat CRT during the heat-up cycle for the evacuation in the exhaust furnace in which both thermal and vacuum loads are applied are analyzed by the finite element method. From the results, the transient stress states and the crack propagation are clearly explained. Also by using the numerical analysis, a design aimed at the weight reduction is investigated. For the PFCRT with 1 mm reduced panel glass, the thermal stresses are calculated with consideration of vacuum load taken into account