基于有限元仿真的航空整体结构件变形校正

针对航空整体结构件变形复杂、校正效果难以定量预测的工程问题,基于有限元仿真技术,综合研究加工变形-校正过程,对航空整体结构件的变形校正有限元建模、校正过程数值模拟、校正参数确定、校正载荷施加形式及校正残余应力等关键技术进行了研究,并运用上述技术对某航空铝合金材料整体结构件进行了变形校正有限元数值模拟.结果表明,综合研究加工变形-校正过程,提取变形有限元模型作为初始校正模型,进行有限元加载-卸载分析,可很好地模拟校正过程,并获得实际需要的校正参数.

Straightening technique for distorted aeronautical monolithic component based on finite element numerical simulation

For aeronautical monolithic component,because of the complication of machining distortion,straightening parameters are difficult to be gained quantitatively in the process of distortion correcting that inevitably leads to the distorted components discarded as useless.The research on straightening technique based on finite element simulation was carried out by integrating machining distortion with straightening process.Correlated key technologies were studied,including finite element modeling for straightening,numerical simulation method for straightening process,determination of straightening parameters,different kinds of straightening load,the law of residual stress redistribution due to straightening load and so on.The straightening process for aeronautical monolithic component was simulated using finite element analysis software with these technologies.The results show that the integration of machining distortion simulation and straightening simulation is an efficient way to research on straightening technology.In the straightening process,the prime distorted model can be extracted from machining distortion simulation.The analysis for loading and unloading was carried out to simulate straightening process and straightening parameters can be obtained quantitatively.