期刊
MATERIALS & DESIGN
卷 88, 期 -, 页码 528-536出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.09.016
关键词
Superalloy honeycomb core sandwich panel; Active imaging stereo-digital image correlation; High-temperature deformation measurement
资金
- National Natural Science Foundation of China [11272032, 11322220, 11427802]
- Program for New Century Excellent Talents in University [NCET-12-0023]
- Science Fund of State Key Laboratory of Automotive Safety and Energy [KF14032]
- Beijing Nova Program [xx2014B034]
This paper investigates heat-shielding performance and 3D thermal deformation behavior of two superalloy honeycomb-core sandwich panels in time-varying thermal environment by using a self-developed transient aerodynamic heating simulation system and a novel active imaging stereo-digital image correlation (stereo-DIC) technique. To facilitate deformation measurement of large objects using stereo-DIC, a simple but practical technique is adopted for fabricating high-temperature speckle patterns on large measuring areas. The results indicate that the sandwich panels provide good thermal shielding performance under 900 degrees C with the thermal insulation effect stabilizing at around 30%. The measured high-temperature deformation fields of the test sandwich panels reveal that an in-plane homogeneous thermal expansion occurs as expected, while the out-of-plane deformation shows evident axisymmetric distributions with the maximum deflections dependent on the temperature differences between the back and front facets. The results provide a foundational understanding on the thermal-mechanical characteristics of superalloy honeycomb-core sandwich panels, which is essential to the structural design of a superalloy honeycomb sandwich thermal protection system. (C) 2015 Elsevier Ltd. All rights reserved.
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