#LunchtimeTalkTuesdays Real-Time Imaging of the Structure and Mechanical Properties of Engineering and Biological Materials at Multiple Length-Scales Robert O. Ritchie, University of California, Berkeley 2013 David Turnbull Lecture Abstract: The structure of materials invariably defines their mechanical behavior. However, in most materials, specific mechanical properties are controlled by structure at widely differing size-scales, literally from atomistic to near-macro dimensions. Here we explore the use of real time mechanical and structural characterization of both biological materials, e.g., human bone, and engineering materials, e.g., ultrahigh-temperature ceramic composites, to discern the origins of their strength and toughness properties at multiple length-scales. Specifically, we examine the use of macro-scale fracture mechanics testing coupled with in situ micro-scale imaging in the environmental scanning electron microscope, in situ tensile tests with simultaneous nano-scale small-angle and wide-angle x-ray scattering/diffraction in the synchrotron, and the real time quantitative 3-D micro-scale characterization of damage in textile composites under load at temperatures as high as 1850°C using x-ray computed tomography. The applications with respect to bone include discerning the structural origins of its damage-tolerance and identifying how biological factors such as aging and disease can degrade this; with respect to ceramic composites the quantification of the damage mechanisms under load at temperature provides crucial input for computational and statistical models for life prediction. View more talks FREE at mrs.org/on-demand.
Posted on: Tue, 21 Oct 2014 16:59:05 +0000
Trending Topics
Recently Viewed Topics
© 2015