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本文用有限元法研究了显象管玻壳的应力和位移分布。由于显象管玻壳是一种变厚度的组合壳体,很难用板壳经典理论进行求解,传统的玻壳强度分析主要依靠电测法。玻壳设计应用有限元法可以使玻壳在设计阶段就可预知应力与位移分布情况,便于修改设计,这样就可缩短设计制造周期和提高经济效益。文中给出了用有限元法和电测法得到的应力分布图。二者结果比较吻合。根据玻壳在大气压力作用下的位移值和防爆钢带箍紧后玻壳的位移性质,提出玻壳防爆质量的无损检测法,其优点是弥补传统的抽样引爆方法的缺陷,应用新方法玻壳无须引爆,减少了玻壳成品的损耗,大大降低了玻壳成本,而且便于玻壳逐个检验,提高了显象管的防爆质量,建议推广应用。
In this paper, the distribution of stress and displacement of the glass bulb of the kinescope is studied by the finite element method. Because the glass bulb of the kinescope is a kind of composite shell with variable thickness, it is difficult to solve it with the classical theory of plate and shell. The traditional strength analysis of glass bulb mainly relies on electrical measurement. The finite element method of glass bulb design can make the glass bulb predict the distribution of stress and displacement in the design stage, and it is easy to modify the design, which can shorten the design manufacturing cycle and improve economic efficiency. The stress distribution maps obtained using the finite element method and electrical measurements are given in the text. The two results are more consistent. According to the displacement value of the glass bulb under the atmospheric pressure and the displacement property of the glass bulb after the explosion-proof steel strap tightly, a non-destructive testing method for the explosion-proof quality of the glass bulb is proposed. Its advantage is to make up for the defects of the traditional sampling detonation method and apply new methods. The shell does not need to be detonated, which reduces the loss of the glass bulb product, greatly reduces the cost of the glass bulb, and facilitates inspection of the glass bulbs one by one, improving the explosion-proof quality of the picture tube, and it is proposed to be popularized and applied.