PSI - Issue 31

David Liović et al. / Procedia Structural Integrity 31 (2021) 86– 91 David Liovi ć et al. / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 4. (a) Comparison of cyclic and monotonic stress – strain curves for horizontally oriented specimens; (b) Comparison of cyclic and monotonic stress – strain curves for horizontally oriented specimens (R – O monotonic (black) and true stress – strain curve (green), R – O cyclic (orange) and true stress – strain curve (blue)) 4. Conclusions Under cyclic loading SLM-ed Ti6Al4V alloy has prominent cyclic softening behavior in both horizontally and vertically oriented specimens, as well as in annealed, wrought, and as – built conditions. Calibrated R – O monotonic and cyclic parameters for SLM-ed Ti6Al4V alloy are determined and used to present elastoplastic material behavior. The preliminary research showed that known and widely used simple R – O model is applicable for modelling elastoplastic behavior of advanced materials, such as SLM-ed Ti6Al4V alloy. Since it showed additional phenomena which occur in the material, more complex nonlinear cyclic plasticity material models, such as Chaboche or Ohno – Wang, should be used to capture them. This refers mostly to the evident isotropic and kinematic softening since R – O model is not adequate for modeling transient behavior during cycling. The further research will also be extended to experimental tests of monotonic, cyclic, and low cycle fatigue behavior of Ti-xCu alloys. Acknowledgements This work has been supported by Croatian Science Foundation under the project number IP-2019-04-3607 and by University of Rijeka under project number uniri-tehnic-18-34. References Agius, D., Kourousis, K. I., Walbrink, C., Song, T., 2017. Cyclic Plasticity and Microstructure of As-Built SLM Ti-6Al-4V: The Effect of Build Orientation. Materials Science and Engineering A 701, 85–100. Babić, M., Verić, O., Božić, Ž., Sušić, A., 2020. Finite Element Modelling and Fatigue Life Assessment of a Cemented Total Hip Prosthesis Based on 3D Scanning. Engineering Failure Analysis 113, 104536. Bryers, J. D., 2008. Medical Biofilms. Biotechnology and Bioengineering 100(1), 1–18. Carroll, B. E., Palmer, T. A., Beese A. M., 2015. Anisotropic Tensile Behavior of Ti-6Al-4V Components Fabricated with Directed Energy Deposition Additive Manufacturing. Acta Materialia 87, 309–320. Domingo, J. L., 2002. Vanadium and Tungsten Derivatives as Antidiabetic Agents: A Review of Their Toxic Effects. Biological Trace Element Research 88(2), 97–112. Jesus, J. S., Borrego, L. P., Ferreira, J. A. M., Costa, J.D., Capela, C., 2020. Fatigue Crack Growth under Corrosive Environments of Ti-6Al-4V Specimens Produced by SLM. Engineering Failure Analysis 118, 104852. Juechter, V., Franke, M. M., Merenda, T., Stich, A., Körner, C., Singer., R. F., 2018. Additive Manufacturing of Ti-45Al-4Nb-C by Selective Electron Beam Melting for Automotive Applications. Additive Manufacturing 22, 118–126. Nabhani, M., Shoja Razavi, R., Barekat. M., 2019. Corrosion Study of Laser Cladded Ti-6Al-4V Alloy in Different Corrosive Environments. Engineering Failure Analysis 97, 234–241. Ortega, P. C., Medeiros, W. B., Moré, A. D. O., Vasconcelos, R. F., da Rosa, E., Roesler, C. R. M., 2020. Failure Analysis of a Modular Revision Total HIP Arthroplasty Femoral Stem Fractured in Vivo. Engineering Failure Analysis 114, 104591.