Coupled systems mechanics

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Analytical crack growth in unidirectional composite flywheel

  • Lluis Ripoll (Mechanical Engineering & Industrial Construction, Universitat de Girona) ;
  • Jose L. Perez-Aparicio (Continuum Mechanics & Theory of Structures, Universitat Politecnica de Valencia) ;
  • Pere Maimi (Mechanical Engineering & Industrial Construction, Universitat de Girona) ;
  • Emilio V. Gonzalez (Mechanical Engineering & Industrial Construction, Universitat de Girona)
  • Received : 2023.03.09
  • Accepted : 2023.03.30
  • Published : 2023.04.25
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Abstract

Scarce research has been published on crack propagation fracture of flywheels manufactured with carbon fiber-reinforced polymers. The present work deals with a calculation method to determine the conditions for which a crack propagates in the axial direction of the flywheel. The assumptions are: flywheels made with just a single thick ply or ply clustering laminates, oriented following the hoop direction; a single crack is analyzed in the plane defined by the hoop and axial directions; the crack starts close to one of the free edges; its axial length is initially large enough so that its tip is far away from that free edge, and the crack expands the entire circumferential perimeter and keeps its concentric position. The developed method provides information for a good design of flywheels. It is concluded that a fracture-based crack propagation criterion generally occurs at a lower speed than a stress-based criterion. Also, that the evolution of failure with thickness using the fracture criterion is exponential, demonstrating that thin flywheels are relatively not sensitive to crack propagation, whereas thick ones are very prone.

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References

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