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Coupled Systems Mechanics
  Volume 12, Number 2, April 2023 , pages 183-197

Analytical crack growth in unidirectional composite flywheel
Lluis Ripoll, José L. Pérez-Aparicio, Pere Maimí and Emilio V. González

    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.
Key Words
    analytical stress analysis; composite material flywheel; crack growth; failure criteria; finite elements; linear fracture mechanics
Lluis Ripoll, Pere Maimí, Emilio V. González: 1Mechanical Engineering & Industrial Construction, Universitat de Girona, 17003 Girona, Spain
José L. Pérez-Aparicio: Continuum Mechanics & Theory of Structures, Universitat Politècnica de València, 46022 Valencia, Spain

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