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Communication Dans Un Congrès Année : 2023

Drilling of multi-material stacks for the assembly of aeronautical structures: from the characterization of the cutting mechanisms to the development of Smart drilling techniques

Yann Landon
Thomas Pottier
Anna Carla Araujo

Résumé

The assembly process in the aeronautical sector mostly uses mechanical fastening. It requires the drilling of hundreds of thousands of fastening holes. As these holes are critical areas for the assembly fatigue life, the drilling operation is a key point. The fatigue performance of a machined surface can be correlated to the surface integrity. But the correlation between the machining process and the surface integrity seems very broad and complex. To understand the impact of the drilling process on the surface integrity, a multi-scale approach was developed. The characterization of the local cutting mechanisms in drilling allows to better model the thermomechanical loading on the surface. Investigations on drilled holes show the complexity of the characterization of the surface integrity. Some results on Aluminum or Titanium alloys will be presented. The surface integrity was studied through surface roughness measurements, microstructure and hardening analysis and residual stress assessment. An innovative Hole Opening Comparative Technique was set up to assess the residual stress state. Fatigue tests were also conducted, showing the major impact of the strain hardening of the hole subsurface, associated with a residual stress state. Significantly different results can be obtained, depending on the material, but also on the process operation. These results on various studies show that the control of the drilling operation can be an important issue. Smart drilling techniques are being developed in the literature. The approach considered in our work was to combine the development of digital twins of the drilling operation, based on the numerous drilling models that were developed, with the consideration of the social acceptability of this technology in the industrial environment.
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Dates et versions

hal-04591419 , version 1 (28-05-2024)

Identifiants

  • HAL Id : hal-04591419 , version 1

Citer

Yann Landon, Thomas Pottier, Anna Carla Araujo. Drilling of multi-material stacks for the assembly of aeronautical structures: from the characterization of the cutting mechanisms to the development of Smart drilling techniques. 3rd International Forum on Aerospace and Aeronautics (Aeroforum), Dec 2023, San Diego (CA), United States. ⟨hal-04591419⟩
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