Article: Investigation and optimisation of cracked aluminium alloy plate restored for fatigue loading application Journal: International Journal of Computer Aided Engineering and Technology (IJCAET) 2022 Vol.16 No.2 pp.153 - 169 Abstract: Crack propagation could be catastrophic, and it needs the urgent attention of the user. A cracked structure needs to be repaired or replaced at the earliest. Costs associated with the complete replacement of the part paves the way for the former option, especially in the aircraft industry. Composite materials have good directional properties in the strength and toughness compared to the conventional materials like metals, alloys and plastics. In this study carbon fibre reinforced polymer (CFRP) has been used to repair the inclined crack in aluminium alloy plate having 1.6 mm thickness. Repaired aluminium alloy specimens were subjected to fatigue load to investigate the effectiveness of CFRP. By using the ply drop technique, the strength of the damaged structure has been restored. Various options have been evaluated by conducting the design of experiment. A peeling off tendency of the CFRP patch was observed during the study. To suppress this peeling off tendency, interfacial shear stress between CFRP and the aluminium was studied more intensely rather than the fracture toughness parameters. To select the optimum configuration MCDM optimisation techniques were used and numerical solutions were validated by lab experiments. Inderscience Publishers - linking academia, business and industry through research

Title: Investigation and optimisation of cracked aluminium alloy plate restored for fatigue loading application

Authors: S. Tamboli; A. Pandey; Mukundraj V. Patil

Addresses: Department of Mechanical Engineering, Symbiosis Institute of Technology, Symbiosis International University, India ' Department of Mechanical Engineering, Symbiosis Institute of Technology, Symbiosis International University, India ' Intelligent Artificial Machine for Computing, Optimization and Learning, Pune, India

Abstract: Crack propagation could be catastrophic, and it needs the urgent attention of the user. A cracked structure needs to be repaired or replaced at the earliest. Costs associated with the complete replacement of the part paves the way for the former option, especially in the aircraft industry. Composite materials have good directional properties in the strength and toughness compared to the conventional materials like metals, alloys and plastics. In this study carbon fibre reinforced polymer (CFRP) has been used to repair the inclined crack in aluminium alloy plate having 1.6 mm thickness. Repaired aluminium alloy specimens were subjected to fatigue load to investigate the effectiveness of CFRP. By using the ply drop technique, the strength of the damaged structure has been restored. Various options have been evaluated by conducting the design of experiment. A peeling off tendency of the CFRP patch was observed during the study. To suppress this peeling off tendency, interfacial shear stress between CFRP and the aluminium was studied more intensely rather than the fracture toughness parameters. To select the optimum configuration MCDM optimisation techniques were used and numerical solutions were validated by lab experiments.

Keywords: CFRP material; crack repair; interfacial shear stress; peeling of tendency; multi-criteria optimisation; finite element analysis.

DOI: 10.1504/IJCAET.2022.120832

International Journal of Computer Aided Engineering and Technology, 2022 Vol.16 No.2, pp.153 - 169

Received: 09 Jul 2021
Accepted: 12 Oct 2021
Published online: 11 Feb 2022 *

Title: Investigation and optimisation of cracked aluminium alloy plate restored for fatigue loading application

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