Fatigue & Fracture of Engineering Materials & Structures · 1981 · 264 citations · 10 references
Natural SciencesMaterials EngineeringMaterials ScienceMaterials CharacterizationMechanical Behavior Of MaterialsStructural MaterialsDamage MechanicsFailure TheoriesFatigueFracture MechanicsFracture PropagationMicrostructure AnalysisFatigue AnalysisFatigue BehaviorFatigue Crack GrowthFatigue Crack PropagationFatigue DesignFatigue FractureFatigue ModelingHomogeneous Continuum
Fatigue cracks shorter than a critical length propagate anomalously quickly. This paper examines the concept of a ‘critical length’, identifying three regimes of behaviour for different crack lengths. The authors review published work across a wide range of materials to investigate the critical length concept and its three behavioural regimes. An approximate correlation between the critical length for short‑crack behaviour and the microstructure scale is found, LEFM cannot be applied to cracks shorter than this critical length, and a fatigue design philosophy incorporating short‑crack behaviour is suggested.
Abstract— –Fatigue cracks shorter than some critical length tend to propagate anomalously quickly. This paper examines the concept of a ‘critical length’, identifying three regimes of behaviour for different crack lengths. Some published work is examined, covering a wide range of different materials. It is concluded that there is an approximate correlation between the critical length for short crack behaviour and the scale of the microstructure. LEFM is difficult, if not impossible, to apply to cracks shorter than this critical length because the material surrounding a crack cannot be assumed to approximate to a homogeneous continuum. Suggestions are made for a fatigue design philosophy which incorporates short crack behaviour.
10
Prediction of non propagating cracks
Madhar Haddad, T. H. Topper, KN Smith · Engineering Fracture Mechanics · 1979 · 1.1K citations