Acta Photonica Sinica, Volume. 53, Issue 11, 1122002(2024)
Optimization Design of Large Aperture Curved Prism Bonding Based on Finite Element Analysis
Figures & Tables(21)
Fig. 4. Optimal design route of high profile precision bonding of large aperture curved prism
Fig. 10. Influence of bonding quantity on surface shape of curved prism
Fig. 15. Curve diagram of the effect of temperature gradient on the component
Fig. 16. The influence of mechanical and thermal coupling factors on face shape
Table 1. Comparison of 3 simulation methods
View tableView in ArticleTable 1. Comparison of 3 simulation methods
Method Principle Vantage Difficulty Stress birefringence method Stress-optical laws No need to measure adhesive parameters 1. Only for glass materials
2. Matching of equal effectiveness
Forced displacement
method
Thermal stress No requirement for material properties 1. Constrained area needs to be considered
2. Not applicable to large caliber analysis
Temperature load
method
Thermal deformation 1. No requirement for material properties
2. Large，medium and small diameters can be analyzed
Cannot analyze other thermal analyses
Table 2. Material property sheet of curved prism assembly
View tableView in ArticleTable 2. Material property sheet of curved prism assembly
Structure Materials Young's modulus/MPa Coefficient of expansion/（×10-6 K-1） Density/（kg·m-3） Poisson's ratio Flexible structure Invar 141 2.4 8 100 0.25 Picture frame AlSiC 200 5.98 3 040 0.22 Curved prism Quartz 72.5 0.51 2 203 0.17
Table 3. Adhesive material related properties
View tableView in ArticleTable 3. Adhesive material related properties
Materials Modified Young's modulus/MPa Coefficient of expansion/（×10-6 K-1） Density/（kg·m-3） Poisson's ratio 3M-2216 1 378 102.0（0~40 ℃） 1 470 0.430 134（40~80 ℃） Milbond 7 104（-50 ℃） 62（-54~20 ℃） 1 200 0.49 1 902（20 ℃） 72（20~70 ℃） GHJ-01 4 758.6 72（>20 ℃） 1 220 0.495
Table 4. Comparison of the performance of 3 types of adhesives
View tableView in ArticleTable 4. Comparison of the performance of 3 types of adhesives
Performances 3M-2216 Milbond GHJ-01 Recommended thickness/mm 0.102±0.025 0.381±0.025 0.1±0.025 Tensile strength/MPa ≥54 ≥14.5 ≥10 Shear strength/MPa 21（-55 ℃）
22（24 ℃）
4（82 ℃）
17.7（-50）
14.5（25）
≥1 Scope of application/℃ -55~+150 -54~+70 -60~+80 Curing time 30 min（93 ℃）
2 h（66 ℃）
7 d（24 ℃）
3 h（71 ℃）
7 d（25 ℃）
7 d（23 ℃）
2 d（40）
3 h（60~80）
Front surface PV value/nm 100.8 587.0 59.9 RMS value/nm 22.2 136.3 13.3 Back surface PV value/nm 64.8 336.8 39.1 RMS value/nm 12.6 77.2 6.81
Table 5. Surface shape accuracy of curved prism mirror
View tableView in ArticleTable 5. Surface shape accuracy of curved prism mirror
Influences Surface Accuracy Mirror surface PV value/nm RMS value/nm Optimized Bonding Front 2.78 0.53 Back 1.58 0.31 Z-direction gravity Front 16.66 3.01 Back 29.31 5.34 4 ℃ uniform temperature rise Front 6.63 1.51 Back 4.07 0.69 Adhesive curing + Z-direction gravity Front 18.6 3.45 Back 29.1 5.55 4 ℃ uniform temperature rise + Z-direction gravity Front 29.09 5.96 Back 36.85 7.38
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Jun FENG, Siyuan LI, Feicheng WANG, Wencong CHEN, Feifei TIAN, Xinyin JIA. Optimization Design of Large Aperture Curved Prism Bonding Based on Finite Element Analysis[J]. Acta Photonica Sinica, 2024, 53(11): 1122002
Paper Information
Category: Optical Design and Fabrication
Received: Mar. 21, 2024
Accepted: Apr. 24, 2024
Published Online: Jan. 8, 2025
The Author Email: LI Siyuan (Lsy@opt.ac.cn)
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