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| Lateral Crush Mechanism and Honeycomb Stabilization of Nomex Honeycomb Sandwich Structure |
| HAO Xinchao, HU Jie |
| ( COMAC Shanghai Aircraft Design and Research Institute, Shanghai 201210, China ) |
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Abstract The research status of honeycomb lateral crush mechanism was summarized, and the strength of Nomex honeycomb at 180℃ was tested. On this basis, the mechanical model of honeycomb lateral crush mechanism was established. The analysis shows that: when the conventional honeycomb sandwich structure adopts cocure process, the condition of no honeycomb lateral crush problems is that the inclination angle is no more than 25°, the edge of the fabric prepreg is firmly tied-down, and the honeycomb height should not be too high. The key to solve the honeycomb lateral crush problem is to adopt friction belt to tie-down the edge of prepreg and improve the lateral rigidity of honeycomb. The methods to improve the lateral rigidity of honeycomb including adhesive film method, septum method and pre-curing fabric method. The processing test result shows that: for the conventional honeycomb sandwich structure with a height of 60mm and an inclination angle of 30°, the stabilization effect of adhesive film method is not good, the septum method and precuring fabric method are effective measures to solve lateral crush problem of honeycomb sandwich structure, and the precuring fabric method has the weight advantage over the septum method.
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2020, 
