Fatigue & Fracture of Engineering Materials & Structures · 2000 · 27 citations · 12 references
EngineeringMaterials EngineeringMaterials ScienceFinite Element AnalysisMaterials CharacterizationMechanical Behavior Of MaterialsFailure CriteriaFracture MechanicsFracture ToughnessMechanical CharacterizationStrength Of MaterialsStress-strain BehaviorCrack Length MeasurementFracture TestingFracture Toughness MeasurementFracture Toughness TestingMechanical Strength TestingPure TorsionTorsionTorsion Testing
A new method to determine fracture toughness K IC of materials is introduced. A round‐rod specimen having a V‐grooved spiral line with a 45° pitch is tested under pure torsion. An equibiaxial tensile/compressive stress state is effectively created to simulate conventional test methods using a compact‐type specimen with a thickness equivalent to the full length of the spiral line. K IC values are estimated from the fracture load and crack length with the aid of a three‐dimensional finite element analysis. K IC of 7475‐T7351 aluminium is estimated to be 51.3 MPa √m, which is higher than the vendor’s value in the TL orientation by ∼0.8% and higher than 0.5T compact tension (CT) value by 6%; A302B steel yields 54.9 MPa √m being higher than CT test value by ∼2%. Good agreement between the K IC values obtained by different methods indicates the proposed method is sound and reliable.
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