Stress Analysis of the Plastic Shells of Image Intensifiers
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摘要: 为摸清微光像增强器塑料外壳受力规律,掌握质量变化特点,运用形变理论,建立硅橡胶形变数学模型,拟合塑料外壳受力曲线,据此确定微光像增强器塑料外壳出现开裂的必然性和寿命周期特点。结果表明:数学模型与试验数据高度吻合,能够表征塑料外壳受力情况及寿命变化规律。Abstract: To determine the law of stress on the plastic shells of image intensifiers and to identify the characteristics of quality change, the deformation theory is used in this study to establish a mathematical model of silicone rubber deformation and to fit the stress curves of plastic shells. Accordingly, the inevitability and life-cycle characteristics of the plastic shells of image intensifiers are determined. The results show that the mathematical model is in good agreement with the experimental data and can characterize the stress conditions and life variations of plastic shells.
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Key words:
- image intensifier /
- deformation /
- reliability /
- plastic shell /
- silicone rubber
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表 1 不同温度下像增强器外径测试值
Table 1. External diameters of image intensifiers measured at different temperatures
Temperature/℃ Cathode extreme/mm Middle region/mm Anode extreme/mm Average /mm -54 36.497 36.487 36.510 36.498 -43 36.533 36.517 36.543 36.531 -32 36.567 36.553 36.573 36.564 -21 36.600 36.600 36.597 36.599 -10 36.633 36.627 36.643 36.634 1 36.657 36.667 36.667 36.663 12 36.683 36.683 36.693 36.687 23 36.717 36.713 36.713 36.712 34 36.733 36.740 36.737 36.737 45 36.760 36.753 36.753 36.756 56 36.783 36.783 36.780 36.782 67 36.810 36.807 36.803 36.807 表 2 吸潮微光像增强器外径和L1值
Table 2. External diameter and L1 values of the moistureabsorber image intensifier
Year Diameter/mm L1 value/mm Remarks 2013 36.92 35.92 Shell cracking 2014 36.89 35.89 Shell cracking 2015 36.88 35.88 Shell cracking 2016 36.83 35.83 Shell cracking 2017 36.76 35.76 Shell not cracked 2018 36.75 35.75 Shell not cracked 2019 36.72 35.72 Shell not cracked 表 3 未吸潮微光像增强器外径和L2值
Table 3. External diameter and L2 values of non-moisture imageintensifier
Serial number Diameter/mm L2 value/mm Average/mm Note 1 36.70 35.70 35.71 The wallThickness of the shell is 0.50 mm 2 36.71 35.71 3 36.73 35.73 4 36.70 35.70 5 36.71 35.71 表 4 不同年份像增强器吸潮应力值
Table 4. Moisture absorption stress values of image intensifier in different years
Year 2013 2014 2015 2016 2017 2018 2019 2020 Natural stress/MPa 14.10 12.12 11.45 8.08 3.37 2.69 0.68 0 -
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