Core reinforcement design for improving flexural energy-absorption of corrugated sandwich composite structure  

作　　者：Yiru REN Yabin DENG Hongyong JIANG 

机构地区：[1]State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China [2]College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China

出　　处：《Chinese Journal of Aeronautics》2021年第5期510-522,共13页中国航空学报（英文版）

基　　金：supported by the Foundation for Innovative Research Groups of the National Natural Science Foundation of China(No.51621004);the National Natural Science Foundation of China(No.11402011);Hunan Provincial Innovation Foundation for Postgraduate,China(No.CX2018B204)。

摘　　要：To strengthen Specific Energy-Absorption(SEA)behavior of Sandwich Composite Structure(SCS),a kind of light-weight vertical stiffener is proposed for the corrugated core.The vertical stiffener,embedded in the corrugated core,can not only absorb part of energy but also simultaneously enhance Energy-Absorption(EA)of other components.The Hashin damage model considering the shear stress and ductile damage model is adopted to predict the failure of carbon fiber face-sheets and aluminum-core,respectively.The perfect bonding is modeled for interfaces between the face-sheet and core due to little realistic debonding.The finite element model is verified by available data of conventional SCS.To obtain more design ideas,several stiffeners with different thicknesses,numbers,and positions are investigated.From the predicted results,both the flexural load and deformation of SCS correlate well with experimental results.It is highlighted that the SCSs with different vertical stiffeners exhibit 9.74%-58.48%higher SEA than the SCS without stiffener.The complex reinforcement mechanisms are extensively revealed by underlying coupling EA and deformation mechanisms.Structural parameter analysis shows that the thickness and number have significant effects on the flexural behavior and SEA of reinforced SCS.

关 键 词：Energy absorption Finite element REINFORCEMENT Sandwich structure 

分 类 号：TB33[一般工业技术—材料科学与工程]