Experimental and numerical investigation of ductile damage and fracture under biaxially loaded tensile reverse loadings Z. Wei∗, S. Gerke, M. Brünig Institut für Mechanik und Statik, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, 85579 Neubiberg, Germany ∗ zhichao.wei@unibw.de Keywords: Biaxial experiment, Reverse loading, Ductile damage and fracture Although many studies on the behavior of metal sheets are based on experiments with uniaxially loaded specimens, the engineering structures are often imposed by multi-axial cyclic loading in manufacturing processes and applications. Therefore, biaxially loaded cruciform specimens are used to investigate the plastic, damage, and fracture behavior under monotonic proportional or non-proportional loading conditions [1-2]. Recently, it has been detected that the damage and fracture behavior is remarkably influenced by different low-cycles reverse loadings [3-4].This presentation deals with the experimental and numerical analysis of the plastic, damage, and fracture behavior caused by biaxial non-proportional tensile reverse loadings. A series of tensile reverse loading tests with biaxially loaded specimens superimposed by different shear preloads are performed during the experiments. Digital image correlation monitors and analyzes the global force-displacement behavior and the local strain fields. The various damage mechanisms are revealed through scanning electron microscopy of fractured surfaces. In the numerical part, an anisotropic elastic-plastic-damage two-surface uncoupled continuum model is utilized to predict material behavior in both macro- and micro-levels. The proposed material model provides accurate numerical results compared to the experimental ones. References [1] Raj, A., Verma, R. K., Singh, P. K., Shamshoddin, S., Biswas, P., & Narasimhan, K. (2022). Experimental and numerical investigation of differential hardening of cold rolled steel sheet under non-proportional loading using biaxial tensile test. International Journal of Plasticity, 154, 103297. [2] Brünig, M., Zistl, M., & Gerke, S. (2021). Numerical analysis of experiments on damage and fracture behavior of differently preloaded aluminum alloy specimens. Metals, 11(3), 381. [3] Wei, Z., Zistl, M., Gerke, S., & Brünig, M. (2022). Analysis of ductile damage and fracture under reverse l-oading. International Journal of Mechanical Sciences, 228, 107476. [4] Kanvinde, A. M., & Deierlein, G. G. (2007). Cyclic void growth model to assess ductile fracture initiation in structural steels due to ultra low cycle fatigue. Journal of Engineering Mechanics, 133(6), 701-712. 21
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