环形编织层板冲击包容数值模拟

Impacting Containment Numerical Simulation of Braided Laminate Ring

为分析航空发动机复合材料机匣对破断叶片的包容,采用有限元仿真方法开展了计算研究。通过旋转体与机匣冲击破坏过程的计算,确定机匣的包容能力。基于具备显式求解功能的商用有限元软件Abaqus/Explicit,采用3维实体单元网格,将2维3轴编织的碳纤维层合材料简化成连续的正交各向异性材料,通过软件提供的Vumat用户子程序接口编写Fortran代码定义材料模型,计算与转轴分离后的模拟断裂叶片对机匣的冲击过程。通过冲击后的临界转速和能量吸收数据,比较了模拟计算与实物旋转冲击模拟试验的结果,二者具有较大的可比性。虽然计算中还缺乏材料基本性能表征的理想数据,但在多种工况下仿真计算表明模拟结果稳定,有望成为复合材料包容分析实用有效的方法。

The break blade containment of aeroengine composite casing was analyzed by FEM（Finite Element Method） simulation.The casing containment capability was determined by simulating the impacting break process between rotating body and casing.Based on the commercial FEM software（Abaqus/Explicit） with explicit calculation function,2D triaxial braided carbon/epoxy laminate was simplified to be continuous orthotropic materials by 3D object unit grid.The impacting process of simulation break blade on the casing separating with the bearing was simulated by the Vumat with Fortran code material model.The simulation and experimental results of object rotating impacting were compared by the impacted critical speed and energy absorption data,the simulated results are accorded with the test data.Although it is lack of ideal data of material basic performance,the simulation results are stability on variable operations,which is capable to be effective method of composite containment analysis.