NASA Technical Reports Server (NASA) · 2010 · 98 citations · 0 references
Natural SciencesMaterials EngineeringMaterials ScienceMaterials CharacterizationMechanical Behavior Of MaterialsStructural MaterialsComposite MaterialsFatigueFracture MechanicsFracture ToughnessMechanical CharacterizationStrength Of MaterialsComposite Fracture MechanicsDelaminationFatigue TestingFracture Of Composite MaterialsFracture Toughness MeasurementFracture Toughness TestingInterlaminar Fracture ToughnessMode Ii Fracture
Mode II interlaminar fracture toughness and delamination onset and growth characterization data were generated for IM7/8552 graphite epoxy composite materials from two suppliers for use in fracture mechanics analyses. Both the fracture toughness testing and the fatigue testing were conducted using the End-notched Flexure (ENF) test. The ENF test for mode II fracture toughness is currently under review by ASTM as a potential standard test method. This current draft ASTM protocol was used as a guide to conduct the tests on the IM7/8552 material. This report summarizes the test approach, methods, procedures and results of this characterization effort.