客机复合材料APU舱门结构设计及分析

按照结构布局、适航要求及APU门载荷水平,对复合材料APU舱门结构进行设计研究.为满足防火要求和闪电防护要求,选择先进碳纤维复合材料和泡沫芯材,设计了一种复合材料夹层结构.利用有限元模型对夹层结构在气动载荷和风载作用下进行应力和位移分析,得到应变云图和变形云图,分析说明该夹层结构设计满足设计要求.通过对B737飞机APU舱门结构研究和重量提取,进行重量等效对比分析,结果表明该复合材料夹层结构比金属结构重量轻25.8％,减重效果明显.

Structural design and analysis of aircraft composite APU doors

According to the structure configuration, airworthiness standards and door loads, structures of composite auxiliary power unit doors are studied. To meet the requirements of fire protection and lightning protection, a composite sandwich structure is designed with advanced carbon fiber composites and foam. The stress and displacement of the sandwich structure are analyzed by a finite element model under the aerodynamic and wind load. The strain and displacement graphs prove that the structure meets the design requirements. The metal structures and the weight of a B737 APU door with a 3D model of equivalent weight are studied. The results show that the composite sandwich structures of APU door is 25.8 % lighter.