Kevlar缠绕增强机匣包容过程研究

INVESTIGATION ON CONTAINMENT PROCESS OF CASE WRAPPED WITH KEVLAR FABRIC

开展轻质复合材料风扇包容机匣的研究,对大型民用涡扇发动机的减重设计具有重要意义。为研究Kevlar纤维束编织布缠绕增强机匣的包容过程,在立式试验台上进行高速旋转平板叶片撞击Kevlar缠绕增强铝合金内层机匣的包容试验,并采用显式瞬态动力学软件LS-DYNA对撞击过程进行数值仿真。结果表明:叶片撞击机匣的过程可分为3个阶段,其中包括两次主要的撞击;断叶的冲击动能大部分由Kevlar纤维束编织布吸收;断叶包容过程中外层纤维布会产生较大的鼓包变形,鼓包的大小和位置随叶片运动而改变。

Lightweight composite fan case is of a great significance to the weight reduction design of a large civil turbofan engine. To investigate the containment process and mechanism of a Kevlar wrapped reinforced case structure, containment tests were conducted on a high speed spin tester, using a high speed rotating plate blade to impact the aluminum alloy ring wrapped with Kevlar49 fabric. Numerical simulation was carried out using explicit transient dynamic code LS-DYNA. The results show that the containment process of the case can be divided into three stages, which involve two main impacts. The majority of the blade kinetic energy is absorbed by the Kevlar woven fabric. There is a large bulge deformation on Kevlar fabric in the containment process. The size and location of the bulge change with the movement of released blade.