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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.

It is well known that the strength characteristics of the glass used for the cathode ray tubes usually has a distinct scatter under the influence of surface flaws. Therefore, it is important to consider the variations in the static and delayed fracture strength of glass for the reliable design of vacuum cathode ray tubes under the atmospheric pressure. In this study, static and delayed fracture strength tests of glass were carried out using polished, abraded and scratched surface specimens in atmosphere in order to investigate the influence of the surface conditions on the strength characteristics statistically. From the goodness of fit test by the chi-square (x2) methed, the validity of the assumed distribution of the cumulative failure probability on the static and delayed fracture strength corresponding to each surface condition are discussed. Moreover, the statistical properties of the relationships between the static and delayed strengths are examined.

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