激光与光电子学进展, 2018, 55 (3): 030104, 网络出版: 2018-09-10   

热-机械耦合作用下黏结材料对变形镜应力特性的影响 下载: 712次

Influence of Adhesive Materials on Stress Characteristics of Deformable Mirrors Under Thermo-Mechanical Coupling
作者单位
四川大学电子信息学院, 四川 成都 610065
摘要
为分析热-机械耦合作用下黏结材料对变形镜应力特性的影响,利用有限元方法建立了含黏结材料的变形镜模型。采用顺序耦合分析方法分析和比较了三种典型黏结材料对变形镜应力分布的影响,并讨论了在不同胶层厚度下变形镜最大应力的变化规律。结果表明,在实际的变形镜系统中,由于热-机械耦合作用,黏结材料的特性和参数会对变形镜的应力特性产生明显的影响。黏结材料对变形镜前表面的应力分布与面形峰谷值几乎没有影响,而对其后表面的应力分布影响较大,尤其会导致镜面与极头连接处的应力明显增大。对于不同的黏结材料,黏结材料的弹性模量和热膨胀系数越小,变形镜所受的应力越小。在三种典型的黏结材料中,胺类固化环氧5222材料对应的变形镜应力最大,酚醛环氧树脂T300材料对应的变形镜应力最小,而酚醛环氧树脂4221材料对应的变形镜应力居二者之间。此外,黏结材料的胶层厚度会直接影响变形镜的应力特性,其最大应力值随胶层厚度的增大而明显减小。在变形镜制作过程中,应在有效控制胶层内部气泡等缺陷产生的前提下选择较厚的黏结厚度。
Abstract
In order to analyze the effect of adhesive material on the stress characteristics of the deformable mirror (DM) under thermo-mechanical coupling, we establish a DM model with adhesive material by the finite element method. We analyze and compare the effects of three typical adhesive materials on the stress distributions of the DM using the sequential coupling method, and discuss the variation law of the maximum stress of the DM for adhesive layers with different thicknesses. The results indicate that the characteristics and parameters of the adhesive material greatly affect the stress characteristics of the DM due to thermo-mechanical coupling in an actual DM system. The adhesive material has almost no effect on the stress distribution of the front surface of DM, as well as the peak-valley value of the surface shape, but has a significant influence on the stress distribution on the rear surface. In addition, the stress at the joint between the mirror and the pole is significantly increased. For different kinds of adhesive materials, the smaller the elastic modulus and the thermal expansion coefficient are, the smaller the stress on the DM is. Among the three typical adhesive materials, the stress on the DM glued with the amine-cured epoxy 5222 material is the largest, the stress on the DM glued with the phenolic epoxy resin T300 material is the smallest, and the stress on the DM glued with the phenolic epoxy resin 4221 material is between those of the two materials. In addition, the thickness of the adhesive layer directly affects the stress characteristics on the DM, whose maximum value decreases with the increase of the thickness of the adhesive layer, which means that in the process of the DM manufacturing, a thicker adhesive thickness should be chosen reasonably under the condition of effective controlling the produce of the bubble and other defects inside the adhesive layer.

王家秋, 罗帅, 张彬. 热-机械耦合作用下黏结材料对变形镜应力特性的影响[J]. 激光与光电子学进展, 2018, 55(3): 030104. Jiaqiu Wang, Shuai Luo, Bin Zhang. Influence of Adhesive Materials on Stress Characteristics of Deformable Mirrors Under Thermo-Mechanical Coupling[J]. Laser & Optoelectronics Progress, 2018, 55(3): 030104.

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