Numerical and experimental response of FSSW of AA5052-H32/epoxy/AA5052-H32 sandwich sheets with varying core properties
- PDF / 2,137,847 Bytes
- 21 Pages / 595.276 x 790.866 pts Page_size
- 70 Downloads / 195 Views
ORIGINAL RESEARCH
Numerical and experimental response of FSSW of AA5052-H32/epoxy/AA5052-H32 sandwich sheets with varying core properties Pritam Kumar Rana 1 & R. Ganesh Narayanan 1 Received: 15 June 2020 / Accepted: 21 October 2020 # Springer-Verlag France SAS, part of Springer Nature 2020
Abstract The present work aims to assess the joint behaviour of friction stir spot welded sandwich sheets by changing the quality of the epoxy core layer. Lab scale experiments and numerical simulations are conducted for the purpose. The core property is altered by varying hardener to resin (h/r) ratio within a suitable range. Joint mechanical performance and joint characterization are evaluated from experiments. Cohesive zone modelling has been incorporated in Abaqus to monitor the hook formation and interface delamination, which is not performed until now in literature. The core quality influences the behaviour of sandwich sheet and hook geometry significantly. Desired h/r ratio is also evaluated from such results, and FSSW is found advantageous at some h/r ratios. The failure mode is independent of h/r ratio and loading conditions. The final joint shape and hook geometry obtained from FE simulations agree well with that of from experiments. Cohesive zone modelling helped in accurate prediction of delamination, and without it, the hook geometry and plastic energy dissipation predictions are approximated. It has been suggested to incorporate cohesive zone model during FE simulations to have a realistic prediction of sandwich joint performance. Keywords Sandwich panel . Epoxy . Friction stir spot welding . Failure mode . Finite element analysis . Cohesive zone modelling
Introduction Due to promising properties of sandwich sheets, their applications in automobile industries have increased in recent years. It is mainly used to fabricate internal panels, hoods, and fenders. A sandwich sheet is a composite panel comprised of two metallic skins separated by a thick core layer having lesser density as compared to the skin [1]. Few salient features of sandwich sheets are excellent strength to weight ratio, better damping, and acceptable formability. It also protects the occupants of a vehicle when subjected to accidents [2]. Despite advantages over metallic structures, the sandwich sheet poses Supplementary Information The online version of this article (https:// doi.org/10.1007/s12289-020-01596-3) contains supplementary material, which is available to authorized users. * R. Ganesh Narayanan [email protected] Pritam Kumar Rana [email protected] 1
Department of Mechanical Engineering, IIT Guwahati, Guwahati 781039, India
an inherent problem of joining. The joining of sandwich sheets becomes further difficult when the core layer is made up of polymeric material. Since there is a large property difference between metal skin and polymer core, finding a suitable joining technique for this hybrid system is a challenge. Further, if aluminium is used as the skin material, joining becomes further challenging because most of the conventiona
Data Loading...
