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An evaluation of the loading condition on mixed-mode stress intensity factors for CTST specimens made of 2024-T351 aluminum alloy

In this research paper, the unstable fracture of 2024-T351 aluminum
alloy is studied under a variety of in-plane and out-of-plane mixed-mode
loading conditions including pure mode I and pure mode III loadings. A
recently proposed loading device with compact tension shear tearing
(CTST) specimens is employed for performing fracture experiments.
Three-dimensional finite element analyses using the M-integral approach
are conducted to derive the stress intensity factors distributions along
the crack front for different mixed-mode configurations. The numerical
results reveals that the coupled effect of modes II and III can be
observed under mixed-modes I/II, I/III and I/II/III loading conditions.
Furthermore, the values of stress intensity factors at the midsection of
the specimens are used to predict the critical loads based on different
mixed-mode criteria. A good consistency is observed between the
theoretical predictions of the criteria and the experimental results for
different loading conditions.