Infrared and Laser Engineering, Volume. 52, Issue 3, 20220463(2023)
Optimal design and verification of thermal adaptive structure for infrared calibrator with large surface
Figures & Tables(12)
Fig. 2. Schematic diagram of bolted multi-layer structure connection
Fig. 4. Bolt deformation and tightening torque at the high and low temperatures
Fig. 5. Displacement fringe of infrared calibrator at high and low temperatures
Table 1. Changes of bolt tightening torque with different materials at −100 ℃
View tableView in ArticleTable 1. Changes of bolt tightening torque with different materials at −100 ℃
Heat insulation material Bolt material Relative deformation of thermal expansion/mm Changes of bolt tightening torque/N·m Silicone rubber Stainless steel 0.27 13.4 Teflon Stainless steel 0.14 10.4 Silicone rubber Titanium alloy 0.35 14.5 Teflon Titanium alloy 0.22 12.5
Table 2. Residual bolt tightening torque and axial stress when applying different original tightening torque
View tableView in ArticleTable 2. Residual bolt tightening torque and axial stress when applying different original tightening torque
Original tightening torque/N·m −100 ℃ 140 ℃ Residual tightening torque /N·m Residual tightening torque /N·m Bolt axial stress /MPa 10 0 20.4 253.6 12 1.6 22.4 278.5 14 3.6 24.4 303.4 16 5.6 26.4 328.2 18 7.6 28.4 353.1 20 9.6 30.4 378.0 22 11.6 32.4 402.8
Table 3. Deformation of mounting holes under temperature changes and gravity
View tableView in ArticleTable 3. Deformation of mounting holes under temperature changes and gravity
Functional layer and materials Thickness /mm Diameter change/mm Hole location change/mm Heat insulation layer (Teflon) 8 0.21 13.96 Radiating surface (Copper) 25 0.03 2.32 Refrigeration layer (Aluminum) 23 0.05 3.25
Table 4. Effects of mounting hole diameter on shear stress and deformation of bolt
View tableView in ArticleTable 4. Effects of mounting hole diameter on shear stress and deformation of bolt
Displacement fringe at −100 ℃ Mounting hole diameter/mm Shear stress /MPa Deformation/mm 17 313.34 0.015 22 215.66 0.0086 25 160.4 0.0065 28 110.25 0.0043 30 83.61 0.0032
Table 5. Proportion of bolts in different states
View tableView in ArticleTable 5. Proportion of bolts in different states
Temperature/℃ Residual tightening torque Safe and effective connection 0 N·m 0-2 N·m >28 N·m >30 N·m Loose Relaxation Inflation Deformation 140 2.56% 0 2.56% 0 94.9% −100 3.85% 2.56% 0 0 93.6%
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Zhihe Fei, Jun Xu, Shaofei Lan, Xiaodong Zhou, Xiaodong Wang. Optimal design and verification of thermal adaptive structure for infrared calibrator with large surface[J]. Infrared and Laser Engineering, 2023, 52(3): 20220463
Paper Information
Category: Infrared technology and application
Received: Sep. 10, 2022
Accepted: --
Published Online: Apr. 12, 2023
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