PSI - Issue 39

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Aljaž Litrop et al. / Procedia Structural Integrity 39 (2022) 41–46 Author name / Structural Integrity Procedia 00 (20 19) 000–000

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Fig. 4. Specimen surface close-up near the notch with visible crack (left) and linear-elastic FEM analysis displaying surface principal stress vectors (right).

4. Conclusion The crack nucleates at the surface where the notch geometry creates areas of high tensile stress. Once cracking starts, further growth is governed by homogenous shear stresses near the symmetry line of the specimen. We, therefore, conclude that the proposed method with a specially designed fixture, specimen shape, and DIC accompanied crack measurement can be used for experiments on the growth of shear-loaded fatigue cracks. Acknowledgements This research was funded by the Slovenian Research Agency (ARRS), grant research program P2-0182 (R&D evaluations – Razvojna vrednotenja) and grant for young researcher ARRS-MR-LP-2020/544 (Aljaž Litrop). References [1] Kumar, A., Singha, M.K., Tiwari, V., 2020. Structural response of metal sheets under combined shear and tension. Structures 26, 915-933 [2] Daghfas, O., Amna, Z., Mohamed, A., Nasri, R., 2017. Experimental and numerical study on mechanical properties of aluminum alloy under uniaxial tensile test. Frattura ed Integrita Strutturale 11, 263-273. [3] Bressan, J. D., Liewald, M., Drotleff, K., 2020. Predictions of Forming Limit Curves of AA6014 Aluminium Alloy at Room Temperature. Procedia Manufacturing 47, 1293-1299. [4] Yin, Q., Zillmann, B., Suttner, S., Gerstein, G., Biasutti, M., Tekkaya, A. E., Wagner, M. F.-X., Merklein, M., Schaper, M., Halle, T., Brosius, A. 2014. An experimental and numerical investigation of different shear test configurations for sheet metal characterization. International Journal of Solids and Structures 51-5, 1066-1074. [5] Pereira, A.F.G., Prates, P.A., Oliveira, M.C., Fernandes, J.V., 2019. Normal stress components during shear tests of metal sheets. International Journal of Mechanical Sciences 164. [6] Tong, J., 2018. Full‐field characterisation of crack tip deformation and fatigue crack growth using digital image correlation—a review. Fatigue & Fracture of Engineering Materials & Structures 41.9, 1855-1869. [7] Li, D., Huang, P., Chen, Z., Yao, G., Guo, X., Zheng, X., Yang, Y., 2020. Experimental study on fracture and fatigue crack propagation processes in concrete based on DIC technology. Engineering Fracture Mechanics 235. [8] Chen, Y., Sun, S., Ji, C., 2018. Analysis of aluminum sheets with multiple sites damage based on fatigue tests and DIC technique. International Journal of Fatigue 109, 37-48. [9] Carroll, J. D., 2013. High resolution digital image correlation measurements of strain accumulation in fatigue crack growth. International Journal of Fatigue 57, 140-150. [10] ASTM International, 1993. Standard Test Method for Shear Testing of Thin Aluminum Alloy Products, Designation: B831-19., West Conshohocken. [11] ASTM International, 2005. Standard Test Method for Shear Properties of Composite Materials by V-Notched Rail Shear Method, Designation: D7078/D7078M-20. West Conshohocken. [12] Abedini, A., Butcher, C., Worswick, M. J., 2017. Fracture Characterization of Rolled Sheet Alloys in Shear Loading: Studies of Specimen Geometry, Anisotropy, and Rate Sensitivity. Experimental Mechanics 57, 75–88.