PSI - Issue 28

Bahador Bahrami et al. / Procedia Structural Integrity 28 (2020) 829–835 Bahrami et al./ Structural Integrity Procedia 00 (2020) 000–000

834

6

5. Conclusion The in-plane mixed-mode fracture of PMMA dental material specimens was investigated from both experimental and theoretical points of view. In the experimental section, some fracture tests spanning from pure mode I to pure mode II were conducted thanks to the improved version of the SENB specimen. Then in the theoretical section, the GSED criterion was introduced and employed for prediction of the aforementioned experimental data. Additionally, two different relations were used for the calculation of the critical distance of the PMMA dental biomaterial. The former was based on the well-known Schmidt’s relation and the latter was developed in this paper particularly for the GSED criterion. Finally, it was shown that the GSED criterion can provide more accurate results than the conventional SED criterion in view of the implementation of the critical distance concept and the inclusion of T stress in the crack tip field. Also, it was shown that predictions of the critical distance relation proposed in this paper are superior to that of Schmidt. References Ayatollahi, M. R., Rashidi Moghaddam, M., Berto, F., 2015. A generalized strain energy density criterion for mixed mode fracture analysis in brittle and quasi-brittle materials. Theoretical and Applied Fracture Mechanics, 79, 70–76. https://doi.org/10.1016/j.tafmec.2015.09.004 Ayatollahi, M. R., Ghouli, S., 2019. Fracture analysis of a dental restorative bio-composite using a strain-based fracture model. Materials Today: Proceedings, 7, 545–551. https://doi.org/10.1016/j.matpr.2018.12.006 Ayatollahi, M. R., Ghouli, S., Bahrami, B., 2020. Experimental and theoretical fracture analyses for three biomaterials with dental applications. Journal of the Mechanical Behavior of Biomedical Materials, 103(December 2019), 103612. https://doi.org/10.1016/j.jmbbm.2019.103612 Bahrami, B., Ayatollahi, M. R., Sedighi, I., Yazid Yahya, M., 2019. An insight into mode II fracture toughness testing using SCB specimen. Fatigue & Fracture of Engineering Materials & Structures, 42(9), 1991–1999. https://doi.org/10.1111/ffe.13069 Baleani, M., Cristofolini, L., Minari, C., Toni, A., 2003. Fatigue strength of PMMA bone cement mixed with gentamicin and barium sulphate vs pure PMMA. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 217(1), 9–12. https://doi.org/10.1243/095441103762597683 Deb, S., Vazquez, B., 2001. The effect of cross-linking agents on acrylic bone cements containing radiopacifiers. Biomaterials, 22(15), 2177–2181. https://doi.org/10.1016/S0142-9612(00)00409-9 Frazer, R. Q., Byron, R. T., Osborne, P. B., West, K. P., 2005. PMMA: An Essential Material in Medicine and Dentistry. Journal of Long-Term Effects of Medical Implants, 15(6), 629–639. https://doi.org/10.1615/JLongTermEffMedImplants.v15.i6.60 Ghouli, S., Ayatollahi, M. R., Bushroa, A. R., 2018. Fracture characterization of ceria partially stabilized zirconia using the GMTSN criterion. Engineering Fracture Mechanics, 199, 647–657. https://doi.org/10.1016/j.engfracmech.2018.06.037 Giddings, V. L., Kurtz, S. M., Jewett, C. W., Foulds, J. R., Edidin, A. A., 2001. A small punch test technique for characterizing the elastic modulus and fracture behavior of PMMA bone cement used in total joint replacement. Biomaterials, 22(13), 1875–1881. https://doi.org/10.1016/S0142-9612(00)00372-0 Guandalini, L., Baleani, M., Viceconti, M., 2004. A procedure and criterion for bone cement fracture toughness tests. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 218(6), 445–450. https://doi.org/10.1243/0954411042632144 Kotha, S. P., Li, C., McGinn, P., Schmid, S. R., Mason, J. J., 2006. Improved mechanical properties of acrylic bone cement with short titanium fiber reinforcement. Journal of Materials Science: Materials in Medicine, 17(12), 1403–1409. https://doi.org/10.1007/s10856-006-0616-6 May-Pat, A., Herrera-Kao, W., Cauich-Rodríguez, J. V., Cervantes-Uc, J. M., Flores-Gallardo, S. G., 2012. Comparative study on the mechanical and fracture properties of acrylic bone cements prepared with monomers containing amine groups. Journal of the Mechanical Behavior of Biomedical Materials, 6, 95–105. https://doi.org/10.1016/j.jmbbm.2011.09.017 Ries, M. D., Young, E., Al-Marashi, L., Goldstein, P., Hetherington, A., Petrie, T., Pruitt, L., 2006. In vivo behavior