PSI - Issue 56

Radim Halamaa et al. / Procedia Structural Integrity 56 (2024) 111–119 Halama et al / Structural Integrity Procedia 00 (2023) 000 – 000

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Component b 0 [MPa] b 1 [MPa] b 2 [MPa] b 3 [-] axial 166.7 5929.9 100.8 436.6 shear 126.0 9914.3 105.5 1731.9

(a)

(b)

Fig. 8. Cyclic stress-strain curve reconstructed considering (a) the axial strain; (b) the shear strain.

5. Conclusions The paper presents the accelerated fatigue testing procedure in terms of obtaining multiple points of the cyclic stress-strain curve from a single experiment using an optical method. The procedure was presented in three loading cases performed on an AlSi10Mg alloy prepared by selective laser melting technology. The best candidate for wide application of the accelerated technique in technical practice is the digital image correlation (DIC), which is the most popular optical method in mechanics and was successfully applied in this study. The resulting cyclic stress-strain curves correlate very well with the conventional ones. In the case of the nonproportional loading, the axial as well as shear component of stress/strain can be considered with comparable results. The technique is not limited just to the fatigue area; it can be beneficially applied to creep testing of various materials as described in Halama et al. (2022). Acknowledgements This research work was supported by the project financed from the Czech Science Foundation under the registration number 23-05338S. References Brandl, E., Heckenberger, U., Holzinger, V., 2012. Additive manufactured AlSi10Mg samples using Selective Laser Melting (SLM): Microstructure, high cycle fatigue, and fracture behavior. Materials & Design 34, 159-169. Glodež, S., Klemenc, J., Zupanič, F., Vesenjak, M. , 2020. High-cycle fatigue and fracture behaviours of SLM AlSi10Mg alloy. Transactions of Nonferrous Metals Society of China (English Edition) 30(10), 2577-2589. Halama, R., Gál, P., Paška, Z., Sedlák, J., 2017. A New Accelerated Technique for Validation of Cyclic Plasticity Models, 22nd Conference on Machine Modeling and Simulation, Sklené Teplice, Slovakia. MATEC Web of Conferences 157(2):05008. Halama, R., Kourousis, K., Pagáč, M., Paška, Z., 2022. Cyclic plasticity of additively manufactured metals. In ” Cyclic Plasticity of Metals ” , In: Motlagh, H.J. and Roostaei, A.A. (Eds.). Elsevier: Amsterdam, pp. 397. Chakrabarty, A., Chakraborty, P., Jain, R., Sahu, V.K., Gurao, N.P., Bar, H.N., Khutia, N., 2023. Influence of Scanning and Building Strategies on the Deformation Behavior of Additively Manufactured AlSi10Mg: CPFEM and Finite Element Studies. Metals and Materials International, in press. Chakrabarty, A., Sahu, R., Kumar, A., Bar, H.N., Hitzler, L., Khutia, N., 2023. Finite element evaluation of fracture toughness and crack propagation in LB-PBF AlSi10Mg. Continuum Mechanics and Thermodynamics 35(2), 677-697. Měsíček, J., Čegan, T., Ma, Q. P ., Halama, R., Skotnicová, K., Hajnyš, J., Juřica, J., Krpec, P., Pagáč, M., 2022. Effect of artificial aging on the strength, hardness, and residual stress of SLM AlSi10Mg parts prepared from the recycled powder. Materials Science and Engineering A 855, 143900.