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 going throu gh the exhaust furnace has been a long standing problem. These cracks frequ ently occur during the heat-up cycle for the evacuation in the exhaust furn ace and originate on the corner of the inner surface of the panel. In this paper, 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 in exhaust furnace are clearly explained. Also by using the numerical analysis, a desi gn toward the weight reduction is investigated For PFCRT with 1 mm reduced panel glass, the thermal stresses are calculated and consideration for vacu um load is taken.