Details

Autor(en) / Beteiligte

• Wei, Zhichao
• Gerke, Steffen
• Brünig, Michael

Titel

Ductile damage and fracture characterizations in bi-cyclic biaxial experiments

Ist Teil von

• International journal of mechanical sciences, 2024-08, Vol.276, p.109380, Article 109380

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• This paper discusses novel extremely low-cycle bi-cyclic biaxial reverse experiments with large strains. Various tests with tension–compression–tension (TCT) shear cyclic loads, superimposed by either non-reverse or reverse cyclic loading patterns, are newly designed to investigate the plastic, damage, and fracture behavior. These experiments fill the gaps in carrying out complex reverse loading by utilizing 4mm thick biaxially loaded cruciform specimens. The deformed specimens in different loading stages are examined metallographically with micrographs to elucidate the influence of loading histories on the occurrence and evolution of micro-defects. In addition, scanning electron microscopy (SEM) is also used to analyze the fractured surfaces and verify the anisotropic damage mechanism. An advanced anisotropic cyclic plastic-damage continuum model is utilized to characterize the material behavior, including the Bauschinger effect, the stress-differential effect and the non-hardening effect after shear reverse loading as well as stress-state-induced damage mechanisms. Due to the utilization of the digital image correlation (DIC) technique, the numerical results can be compared with the experimental ones in both load–displacement curves and strain fields, respectively. The elastic strain triaxiality and strain Lode parameter are introduced, providing a novel perspective for analyzing the cyclic loading experiments. [Display omitted] •Novel bi-cyclic shear reverse tests superimposed by different non-reverse and reverse cyclic loads.•Ductile damage under extremely low-cycle experiments with large strains.•Metallographic analysis of the ductile aluminum alloy at different cyclic loading stages.•Anisotropic CDM model considering the Bauschinger, the SD and non-hardening effects.•Special down-holder to delay buckling under compressive loads for biaxial tests.