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轻质、高强和隔热性能优良的蜂窝合金板结构已广泛用于航空航天领域,其在模拟瞬态气动热环境下的热变形是高速飞行器热防护结构设计的重要参数之一.首先,用自行研制的红外辐射瞬态气动热实验模拟系统模拟与其服役环境类似的时变热辐射环境,用新型“主动成像”三维数字图像相关(3D-DIC)测量方法对高温合金蜂窝板结构试件在时变热辐射环境下不同时刻的三维热变形进行了测量.其次,为保证三维数字图像相关测量方法能有效实施,提出一种制作稳定的大面积高温散斑新方法,该方法制作的高温散斑能在整个实验过程中保持稳定,可作为高温变形的有效载体.最后,用Hoff等效刚度理论计算高温合金蜂窝板在稳态时的最大翘曲位移.研究结果表明:210 mm×210 mm的高温合金蜂窝板在单侧面辐射加热条件下其面内变形为均匀热变形,而离面变形为轴对称的翘曲变形,在900℃时其最大离面翘曲位移约为1.6 mm;Hoff等效刚度理论计算结果与实验结果相吻合.
The lightweight, high strength and excellent insulation performance of honeycomb alloy plate has been widely used in the field of aeronautics and astronautics, its thermal deformation under simulated transient aerodynamic thermal environment is one of the important parameters of the design of thermal protection structure for high-speed aircraft.First, The self-developed infrared radiation transient aerodynamic experiment simulation system simulates the time-varying thermal radiation environment similar to its service environment, and uses the new type of “active imaging” 3D digital image correlation (3D-DIC) measurement method to test the structure of high temperature alloy honeycomb panel Piece thermal deformation at different time under the condition of time-varying thermal radiation was measured.Secondly, in order to ensure the effective implementation of the three-dimensional digital image correlation measurement method, a new method for making stable large area high temperature speckle was proposed. The high temperature speckle can remain stable during the whole experiment, which can be used as an effective carrier for high temperature deformation.Finally, the maximum warping displacement of the high temperature alloy honeycomb panels at steady state is calculated by Hoff equivalent stiffness theory.The results show that: 210 mm × 210 mm high-temperature alloy honeycomb panels in the one-sided radiant heating deformation in the plane of its uniform thermal deformation, and out of plane deformation axisymmetric warping deformation, At 900 ℃ maximum out of plane displacement of the warp from about 1.6 mm; Hoff equivalent stiffness calculated results and the experimental results.