TY - GEN

T1 - Numerical investigation of a layered hybrid load introduction element for thin-walled CFRP structures

AU - Herwig, Alexander

AU - Schmidt, Carsten

AU - Horst, Peter

N1 - Funding Information: This paper is based on investigations of the subproject 1 – ‘Multilayer Inserts – intrinsic hybrid compounds for load introduction into thin walled high-performance CFRP-Structures’ of the priority program 1712 ‘Intrinsic hybrid composites for lightweight load-bearings’, which is kindly supported by the German Research Foundation (DFG).

PY - 2020

Y1 - 2020

N2 - The project “Multi-Layer Inserts” (MLI) proposes a new design for inserts used in thin-walled structures made of carbon fiber reinforced plastic (CFRP). The proposed insert consists of multiple thin metal sheets and is build up simultaneously with the laminate in a fully automated intrinsic hybridization process, eliminating time-consuming post-processing steps. Furthermore, such inserts significantly increase the bonding area between metal and CFRP in comparison to conventional inserts at equal weight. This results in a significant increase of the loads that can be transmitted into the CFRP. The individual material layers of the local CFRP-metal-hybrid (CFRP, metal, adhesive) are very thin and form a multitude of adhesive connections. Prior investigations have shown advantages of octagonal shaped metal inserts in reducing strain concentrations. The present work discusses a simplification methodology to investigate the MLI's dependence on and sensitivity to design parameters by dividing the model of the complex adhesive connection into combinations of common lap joints. After proving the transferability of the lap joint approach for very thin laminates, a comparison of the experimentally measured surface strain distribution near an octagonal MLI is used to assess the quality of the approximation.

AB - The project “Multi-Layer Inserts” (MLI) proposes a new design for inserts used in thin-walled structures made of carbon fiber reinforced plastic (CFRP). The proposed insert consists of multiple thin metal sheets and is build up simultaneously with the laminate in a fully automated intrinsic hybridization process, eliminating time-consuming post-processing steps. Furthermore, such inserts significantly increase the bonding area between metal and CFRP in comparison to conventional inserts at equal weight. This results in a significant increase of the loads that can be transmitted into the CFRP. The individual material layers of the local CFRP-metal-hybrid (CFRP, metal, adhesive) are very thin and form a multitude of adhesive connections. Prior investigations have shown advantages of octagonal shaped metal inserts in reducing strain concentrations. The present work discusses a simplification methodology to investigate the MLI's dependence on and sensitivity to design parameters by dividing the model of the complex adhesive connection into combinations of common lap joints. After proving the transferability of the lap joint approach for very thin laminates, a comparison of the experimentally measured surface strain distribution near an octagonal MLI is used to assess the quality of the approximation.

KW - Embedded load introduction

KW - Fiber-metal laminate

KW - Insert

KW - Joints

UR - http://www.scopus.com/inward/record.url?scp=85084164116&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:85084164116

BT - ECCM 2018 - 18th European Conference on Composite Materials

T2 - 18th European Conference on Composite Materials, ECCM 2018

Y2 - 24 June 2018 through 28 June 2018

ER -