Abstract
The main goal of this paper is the application of the Strain Energy Density (SED) criterion and the Theory of Critical Distances (TCD), both of them in combination with the Equivalent Material Concept (EMC), to predict the fracture loads of aluminum alloy Al7075-T651 Compact Tension (CT) specimens containing U-shaped notches. For this purpose, 45 fracture tests were performed combining two rolling orientations (transverse and longitudinal) and 6 notch radii, which cover from crack-type defects (0 mm) up to 2 mm-notch radius. Crack-type specimens are used to define the fracture properties of the material and the rest of the tests are used to check and compare the experimental fracture loads with the loads predicted using the different aforementioned criteria: SED, EMC-SED and EMC-TCD. The theoretical results of the fracture load predictions for the virtual brittle material obtained employing the EMC are in good agreement with the experimental results reported for real samples.
Highlights
Aluminum alloys of the 7xxx series are widely used in engineering structures, in aerospace structures
Theory of Critical Distances when their methodologies were proposed, it was not easy to obtain accurate stress-fields in notched nineteen-fifties, Neuber [33] and Peterson [34] established the basis of the TCD, structural whenWith theirthe methodologies proposed, was notaccurate easy to obtain accurate stress-fields in This notched development were of finite elementitanalysis, stress-fields could be obtained
The fracture loads have been predicted by applying the different aforementioned methods in order to compare the results obtained and to analyze the differences between them
Summary
Aluminum alloys of the 7xxx series are widely used in engineering structures, in aerospace structures. In the nineteen-fifties, Neuber [33] and Peterson [34] established the basis of the TCD, . Nineteen-fifties, Neuber [33] and Peterson [34] established the basis of the TCD, structural whenWith theirthe methodologies proposed, was notaccurate easy to obtain accurate stress-fields in This notched development were of finite elementitanalysis, stress-fields could be obtained. Enabled Taylor [8] to go back to the TCD, which is a group of methodologies that allow the the development of finite element analysis, accurate stress-fields could be. This effectWith of notches on the fracture behavior of engineering materials to be predicted.
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