3.032 Mechanical Behavior of Materials Fall 2007 14 Pa Fe3Be very low stress!! Image removed due to copyright restrictions. Please see Fig. 11.22 in Hosford, William R. Mechanical Behavior of Materials. Cambridge, England: Cambridge University Press, 2005. Eaust = 525 Pa? Emart = 175 Pa? Source: Hosford, Mechanical Behavior of Materials. From R.H. Richman in Deformation Twinning, TMS-AIME, 1963. Lecture 14 (10.12.07)3.032 Mechanical Behavior of Materials Fall 2007 Experiment to measure how long a superelastic NiTi file could survive Images removed due to copyright restrictions. rotating/bending fatigue.Please see Fig. 1 and 8a, b in Young, Jeremy M., and Van Vliet, Krystyn J. “Predicting In Vivo Failure of Pseudoelastic NiTi Devices under Low Cycle, High Amplitude Fatigue.” Journal of Biomedical Materials Research B 72B (2005): 17-26. SEM micrographs of failed NiTi file show that failure starts from the inside out. Source: JM Young and KJ Van Vliet. Predicting in vivo failure of pseudoelastic NiTi devices under low cycle, high amplitude fatigue. Journal of Biomedical Materials Research Part B: Applied Biomaterials 72B: 17-26 (2005). Lecture 14 (10.12.07)3.032 Mechanical Behavior of Materials Fall 2007 Fluid shear viscosity as measured by parallel plate Couette experiment: Image removed due to copyright restrictions. Please see http://content.answers.com/main/content/img/McGrawHill/Encyclopedia/images/CE733900FG0010.gif Source: Science and Engineering Encyclopedia (2006 online) Lecture 14 (10.12.07)3.032 Mechanical Behavior of Materials Fall 2007 τ(t) Applied stresst γ(t) Linear elastic solid t γ(t) Linear viscous fluidt γ(t) Viscoelastic solidt γ(t) Viscoelastic fluid t After Young and Lovell, Introduction to Polymers (1991) & Science and Engineering Encyclopedia (2006 online). Lecture 14
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