期刊
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
卷 24, 期 2, 页码 1169-1188出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/10996362211035425
关键词
Honeycomb core; Nomex (R) paper; mechanical properties; flatwise compression; finite element analysis
类别
资金
- Shanghai Natural Science Foundation [20ZR1462600]
- Aeronautical Science Foundation of China [201909038001]
- Innovation Foundation of SAST [SAST202020]
This study investigated the mechanical properties of Nomex (R) paper and composite Nomex (R) honeycomb sandwich structures (CNHSS) through tensile and flatwise tests, using numerical models to predict CNHSS performance and experimental results for validation. The findings suggest that CNHSS has two flatwise compressive elastic moduli, with manufacturing geometric defects having minimal impact on the ultimate compressive strength. The modified equations accurately predict the flatwise compressive buckling strength and modulus of CNHSS.
In this paper, the mechanical properties of Nomex (R) paper coated with resin and composite Nomex (R) honeycomb sandwich structures (CNHSS) were obtained by tensile tests and flatwise tests respectively. The fundamental mechanical properties of the Nomex (R) paper were used as input materials parameters of finite element model generated at meso-scale level for the CNHSS, and the mechanical properties of CNHSSs were used to validate the numerical results. Based on the test and numerical results, the theoretical equations were modified to predict the flatwise compressive buckling strength and modulus of the CNHSS. The numerical and theoretical results clearly revealed that the CNHSS had two flatwise compressive elastic moduli. However, the flatwise test can only capture the second flatwise compressive elastic modulus due to manufacturing geometric defects of the cell walls. The numerical and test results showed that the manufacturing geometric defects of the cell walls showed little influence on the ultimate flatwise compressive strength. And the modified equation can predict the flatwise compressive buckling strength and modulus of the CNHSS with sufficient accuracy.
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