Ductile failure prediction of thin notched aluminum plates subjected to combined tension-shear loading

Abstract

The main goal of the present research is to check the suitability of the combined Equivalent Material Concept-Averaged Strain Energy Density (ASED) failure criterion, called EMC-ASED, in predicting the load-carrying capacity (LCC) of notched aluminum plates subjected to mixed mode I/II loading. For this purpose, first, a set of experimental results on the LCC of thin Vnotched rectangular Al 7075-T6 plates, that fail by large-scale yielding (LSY) regime, are taken from the open literature. Then, Al 7075-T6, which is a ductile material, is equated with an equivalent linear-elastic isotropic material by means of the EMC. Finally, the EMC is linked to the well-known ASED criterion to predict the LCC of the notched Al 7075-T6 plates. It is revealed that the experimental results could successfully be predicted by means of the combined EMC-ASED criterion without requiring complex and time-consuming elastic-plastic failure analyses.

J‐integral evaluation for V‐notched ductile plates subjected to tension

“…Additionally, failure prediction results based on the EMC-ASED criterion for these experimental data have been reported in Table 2. 6,7 As is evident in Table 2, for Al 7075-T6 specimens, a good agreement with an average accuracy of about 88% can be found between the experimental results and the theoretical predictions obtained from EMC-ASED criterion, while an average accuracy of about 84% is observed for EMC-J criterion. Also, both of the combined energy-based criteria predict LCCs of the Al 6061-T6 specimens with an average accuracy of about 86%.…”

“…As illustrated in Table , there are the discrepancies between the experimental results and theoretical estimations, which are useful to realize the strong and weak points of each ductile failure model, especially those of EMC‐J model investigated in the present contribution. Additionally, failure prediction results based on the EMC‐ASED criterion for these experimental data have been reported in Table . As is evident in Table , for Al 7075‐T6 specimens, a good agreement with an average accuracy of about 88% can be found between the experimental results and the theoretical predictions obtained from EMC‐ASED criterion, while an average accuracy of about 84% is observed for EMC‐J criterion.…”

Prediction of fracture loads in PMMA U‐notched specimens using the equivalent material concept and the theory of critical distances combined criterion

“…At the same time, when analysing an elastic-plastic material, Torabi 42,43 has proposed the use of the equivalent material concept (EMC) to define an equivalent linear-elastic material that develops the same fracture behaviour. This proposal has been combined with the TCD 44,45 or the strain energy density (SED), [46][47][48][49] providing accurate analyses of the fracture behaviour of different materials, such as Al 6061-T6 and Al 7075-T6 and ductile steels. However, no research paper or technical note has been published with a similar analysis of other engineering materials, like polymers or composites.…”

Fracture analysis of dissimilar Al‐Al friction stir welded joints under tensile/shear loading

“…The calculated tensile strength of the equivalent material gives the permission to use brittle fracture criteria for ductile failure predictions. The EMC has been successfully employed in several researches for failure prediction of notched members made of various ductile materials …”

“…The EMC has been successfully employed in several researches for failure prediction of notched members made of various ductile materials. [36][37][38][39][40][41] In the next section, the maximum tangential stress (MTS) and mean stress (MS) brittle fracture criteria are explained, and by including σ * f obtained from EMC in these criteria, the experimentally obtained LCCs of the FSWed CSCB specimens having elastic-plastic behavior are theoretically predicted under mixed mode I/II loading conditions.…”