Molding simulation of airfoil foam sandwich structure and interference optimization of foam-core  

作　　者：Qianying CEN Zeyang XING Qingyou WANG Lili LI Zhigang WANG Zhanjun WU Ling LIU 

机构地区：[1]School of Aerospace Engineering&Applied Mechanics,Tongji University,Shanghai 200092,China [2]AVIC Harbin Aircraft Industry Group Co.Ltd,Harbin 150066,China [3]School of Aeronautics and Astronautics,Dalian University of Technology,Dalian 116024,China

出　　处：《Chinese Journal of Aeronautics》2024年第10期325-338,共14页中国航空学报（英文版）

基　　金：Supported by the Harbin Aviation Industry Group Co.,Ltd and the National Natural Science Foundation of China(No.11972256).

摘　　要：During the Co-Cure Molding(CCM)of airfoil foam sandwich structure,it is challenging to avoid collapse of foam core at the trailing edge.Herein,an Equal Proportional Thickening(EPT)method is proposed to optimize the interference of polymethacrylimide(PMI)foam core during the CCM process.Firstly,based on some basic parameters of composite skin and foam core obtained by experiments or multi-scale simulations,a thermal-curing-mechanical coupling analysis for the CCM of foam sandwich structure is performed and the results show that the maximum stress within foam core occurs at the completion of mold-closing,which tends to decrease during the subsequent CCM process.Then,the foam core is thickened by traditional equidistant-thickening method,and the simulation reveals that the foam core at the trailing edge tends to collapse because of stress concentration.Conversely,if the foam core is thickened by the proposed EPT method,the mold-closing caused collapse at the trailing edge can be effectively avoided,and a thickening ratio range of 0.6%–2.0%is obtained,which is further proved by practical verifications.Therefore,the interference design scheme proposed can ensure the molding quality and effectively reduce the scrap of molded products.

关 键 词：Airfoil foam sandwich structure Polymethacrylimide(PMI)foam INTERFERENCE CO-CURING Molding simulation 

分 类 号：V214.8[航空宇航科学与技术—航空宇航推进理论与工程] V414.8