复合材料层合板下陷区结构设计

Structural Design of Composite Laminate with Joggle

复合材料层合板下陷是飞机结构中应用广泛的典型结构细节。以下陷长深比、相同方向下陷区间距、两个不同方向下陷区间距为下陷区设计变量,建立参数化有限元模型;通过下陷应力应变分布、初始失效和最终承载能力分析,确定各设计变量对下陷区结构力学性能的影响,并进行参数化设计。分析结果表明:下陷区结构最先发生损伤的部位为下陷区转折处;合理的下陷参数设计变量取值为长深比B/A≥20、主受力方向上两个下陷区间距A/H≥12、不同方向上两个下陷区间距C/A_(min)≥1.5。

Composite laminates with joggles as typical design details are widely used in aircraft structures. The length to depth ratio,the same direction joggle spacing and two different direction joggle spacing are used as design verifications to establish the parametric finite element model. Through stress and strain distribution,previous failure and final loading capacity analysis,the effect of design variables on joggle structures' mechanical property is determined and the parametric design is carried out. The results indicate that the structure damage initiates at the transition of joggle;the reasonable design parameters for the joggle are B /A ≥ 20 for length to depth ratio,A /H≥12 for spacing between two joggles in the same direction and C /Amin ≥ 1.5 for spacing between two joggles in different directions.