An Application of Fracture Concepts to the Prediction of Critical Length of Fatigue Cracks. Part V. Experimental Determination of Fracture Toughness and Critical Crack Length of 7075-T7351 Aluminum Alloy Plates

摘要

The validity of applying fracture mechanics concepts for the prediction of critical crack lengths in alloys subjected to tension fatigue loading service conditions was experimentally determined. The investigation consisted of the following steps: generation of basic design data yield strength, modulus of elasticity, and fracture toughness parameters (KIc and Kc) from experimental tests of 7075-T7351 aluminum alloy specimens, use of the generated data with fracture mechanics concept to mathematically predict critical crack lengths in 7075-T7351 aluminum alloy center-notched specimens subjected to axial tension fatigue stresses experimental measurement of critical crack lengths in 7075-T7351 aluminum alloy specimens tested under the fatigue loading conditions used for the mathematical prediction, and comparison of experimental results with analytical predictions. (Author)