Defense Technical Information Center (DTIC) · 1968 · 12 citations · 0 references
EngineeringAerospace EngineeringMechanical EngineeringAerospace StructuresAircraft StructuresStructural EngineeringCrack AssessmentFailure AnalysisFailure CriteriaFracture MechanicsFracture ToughnessStructural TestingCrack DetectionFracture TestingFracture Toughness MeasurementFracture Toughness TestingNon-destructive Crack EvaluationNon-destructive Testing For CracksNondestructive TestingStructural Crack Assessment
This report describes the work conducted on a program designed to investigate the potential applicability of a combined fracture mechanics- nondestructive inspection procedure as a design approach for aircraft structures. The program consisted of three phases, conducted simultaneously: (1) a literature survey to determine if sufficient fracture toughness information exists to determine a statistically valid value of K1c; (2) a test program to determine the minimum size of a crack that can be detected by each of four NDT methods: X-ray, magnetic-particle, penetrant, and ultransonics; and (3) a test program to determine if fracture mechanics, when combined with flaw size as determined by NDT, can accurately predict the failure load of selected structures.