Dynamic Behavior of CRT under Impact Loading.

Abstract

Dynamic behavior of cathode ray tube (CRT) under the ball impact test condition was analyzed by computer simulation. Experiments were also carried out by using an instrumented drop-weight impact testing machine to investigate the impact load and stresses of CRT, and the phenomena of impact fracture of CRT were discussed. The following results were derived.(1) Dynamic behavior of CRT under several impact load conditions changing the impact speed and the hitting point was clarified by using the instrumented testing machine.(2) The results of computer simulation with the impact analysis program DYNA3D showed good agreement with the experimental dynamic behavior of CRT.(3) Static load due to vacuum in the tube or tightening force by the tension band had no effct on the dynamic characteristics of CRT before breaking.(4) It was explained quantitatively that hitting the corner of panel face at the impact test was more severe to the dynamic strength of CRT than the hitting the center of panel face.(5) The macroscopic impact fracture mode of CRT depended on the tensile stress at the edge of panel face and a criterion of the implosion was proposed.

Glass Tube Design for CRT (Cathode Ray Tube)

“…The main mechanical loads of tubes are atmospheric pressure, the tensile force due to the implosion protection structure, and impact loads. The authors have been studying the strength of the tube for some years now [1][2][3][4]. Although various simulation techniques have been applied to the structural design of CRTs, few take proper account of ways to evaluate mechanical reliability [5][6][7][8].…”