The energy dissipation during fatigue crack growth in metallic materials
Haoyuan Quan, René Alderliesten
Abstract
An energy equation for fatigue crack growth was proposed. It equates the total external work per cycle (dW/dN) to the sum of plastic dissipation (dUpl/dN), change in strain energy stored (dUe/dN) and the energy dissipated in new crack surface formation (dUa/dN). Fatigue crack growth experiment of 7075-T6 was used to derive the relation between fatigue crack growth rate (da/dN) and variables in this equation. The result shows dUpl/dN and dUe/dN are not straightforwardly related to da/dN. The dUa/dN, whose value cannot be obtained sufficiently precise experimentally, can be the variable straightforwardly related to da/dN within the range of test.
Topics & Concepts
DissipationParis' lawCrack closureMaterials scienceCrack growth resistance curveWork (physics)Structural engineeringStrain energy release rateStrain energyMetalFracture mechanicsMechanicsComposite materialThermodynamicsMetallurgyEngineeringPhysicsFinite element methodFatigue and fracture mechanicsFire effects on concrete materialsHigh-Velocity Impact and Material Behavior