相位校正器的粘接热应力分析

Cementation Heat Stress Analysis of Phase Corrector

粘接工艺会影响相位校正器的实际性能,然而在研制过程中相位校正器的镜面常出现破损情况。分析粘接工艺后校正面面形的特征和镜面破损的特点发现,镜面玻璃与连接柱头材料之间热膨胀系数差异过大会导致高温固化后校正面相应位置的残余应力过大。建立数值模型对连接处的热应力进行仿真,并选取热膨胀系数与镜面玻璃相近的柱头材料以及固化温度更低的黏接剂减小残余应力。将柱头材料更换为热膨胀系数与玻璃材料(K9)更匹配的3Cr13,实验结果表明,高温固化后相位校正器的静态面形有了极大改善,多次实验均未出现校正面破损的情况。

The bonding process will affect the actual performance of the phase corrector.However,its mirror surface is often damaged during the development process.In this paper,the characteristics of the correction surface shape and the damage to the mirror after the bonding process are analyzed,and it is inferred that the excessive difference in the thermal expansion coefficient between the mirror glass and the connecting column head material causes excessive residual stress in the corresponding position of the correction surface after hightemperature curing.A numerical model is established to simulate the thermal stress of the joints,and it is used to select a stud material with a thermal expansion coefficient similar to that of mirror glass and an adhesive with a lower curing temperature to reduce the residual stress.The stigma material is replaced with 3Cr13,which has a thermal expansion coefficient that matches the glass material(K9).The experimental results show that the static surface shape of the phase corrector has been significantly improved after hightemperature curing,and the correction surface has not been damaged after multiple experiments.