PSI - Issue 33
Panagiotis N. Lymperopoulos et al. / Procedia Structural Integrity 33 (2021) 818–823 Panagiotis Lymperopoulos, Efstathios Theotokoglou / Structural Integrity Procedia 00 (2021) 000–000
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The analyses in ANSYS (ANSYS (2019)) with 28992 BEAM189elements and small and large displacement methods provide results which almost coincide in the linear region with the experimental results of the work of (Hedayati et. al. (2017)).Then, the case of Ti 170-500 is presented by comparing the results of small and large displacement analyses to experimental data. Small and large displacement analyses can predict the behavior of pentamodes under 0.5mm displacement. Non linearities appear after 0.5mm displacement. Finally, the case of Ti 230-500 is presented by comparing the results of small and large displacement analyses to experimental data.
Fig. 6. Force-displacement of Ti 230-500 compared with experimental data.
Small and large displacement analyses can predict the behavior of pentamodes under 0.5mm displacement. Non linearities appear after 0.5mm displacement. 5. Conclusions From our study results that the computational analyses with the small displacement method provide good results in the linear region of displacements when compared with the experimental work of (Hedayati et al. (2017)).In the case of large displacement method, the results are improved as to the percentage differences from the experimental values. It is also results that for the crack length of 1.522 mm the imposed displacement of 0.5 mm is critical for the appearance of non-linearity. The proposed study constitutes the first step in order to confront numerically fractured pentamode structures. A further analysis is needed by taking into consideration different geometries and loadings. Acknowledgements This research was funded by the Research Committee of the National Technical University of Athens. References Fleck, A. N., Deshpande, S. V., Ashby, F. M. Micro-architectured materials: past, present and future. Proceedings of the Royal Society of London A. 2010;466; 2495–2516. Kadic, M., Bueckmann, T., Stenger, N., Thiel, M Wegener M . On the practicability of pentamode mechanical metamaterials. Applied Physics Letters. 2012; 100; 191901-1–191901–4. Fabbrocino, F., Amendola, A., Benzoni, G., Fraternali, F. Seismic application of Pentamode Lattices. International Journal of Earthquake Engineering. 2015; Anno XXXIII; Num 1-2; 62-71. Amendola, A., Carpentier,i G., Feo, L., Fraternali, F. Bending dominated response of layered mechanical metamaterials alternating pentamode lattices and confinement plates. Composite Structures. 2016; 157; 71–77. Lymperopoulos, P. N., Theotokoglous, E. E., Antoniadis, I. A. Computational analysis of metamaterials - an initial study. Procedia Structural Integrity. 2020; 25; 172-179.
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