Validation and modeling of aeronautical composite structures subjected to combined loadings: The VERTEX project. Part 2: Load envelopes for the assessment of panels with large notches

摘要

One of the important issues in the certification of composite aeronautical structures is large notches. In this paper, tests are carried out on technological specimens and under tensile, shear stresses and combined loadings using the VERTEX means presented in the first part of this publication. Strong interactions between postbuckling and propagation of cuts were observed. The FE-SDIC methodology developed specifically allows a first dialog between calculation / testing. The Discrete Ply Modeling method is able to compute the onset of failure of such complex tests. New tests responses called "envelop" are proposed and realized by following a load path that allows to validate the behavior of the notched structure for certification purposes. This methodology should eventually lead to a new vision of the tests pyramid by "Predictive Virtual Testing".