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Session # 1464

TEACHING ABOUT MICROMECHANICS OF FRACTURE AND OTHER FAILURE ANALYSIS APPROACHES FOR BIOMATERIALS

K.V. Sudhakar, Tadeusz Majewski

Department of Mechanical Engineering, Universidad de las Americas-Puebla, Santa Catarina Martir, Puebla 72820, Mexico

Abstract

This paper discusses some of the relevant teaching methodologies and supplemental experimental tools for studying biomaterials. Austenitic Stainless Steel (316L grade) and Vitallium-2000 Plus (Cobalt-Chrome alloy) metallic biomaterials that are commonly in Artificial Hip Joint (AHJ) and Partial Orthodontic Dentures (POD), respectively, are studied. Teaching methods discussed in this paper include; discussion model approach, lecture quiz approach, and learning outside the class room approach. A study on micromechanics of fracture is performed using a JEOL microprocessor controlled Scanning Electron Microscope (SEM-Model JSM 5910 LV). The characterization techniques include Back Scattered Image (BSI), Secondary Electron Image (SEI), Topography of fracture surface, and Energy Dispersive X-ray analysis (EDAX) for studying the fracture surface morphologies of biomaterials. High and low magnification photomicrographs of the fracture surface at several locations are taken to understand the possible mechanisms responsible for the fracture, in both materials. The other failure analysis approaches/methods include destructive and non-destructive tests. Specific experimental procedures for destructive tests (namely, tensile test, hardness, and charpy impact toughness) are developed to suit the exact biomaterial geometries. Microindentation testing procedure is followed to determine the fracture toughness of especially the thin sections of Vitallium partial orthodontic dentures. In this technique, microindentations are made on the polished surface of thin sections of biomaterials using a diamond indenter. The other method involves direct measurement of indentation size (from this the fracture toughness estimation) from the formation of a stable crack. Next, the experimental procedures for carrying out the microstructure studies (specimen polishing, specific etchant and chemical etching procedures) are developed to study the microstructural details in fractured biomaterials. The present detailed and systematic studies bring out the practically useful class-room teaching and supplemental experimental approaches/tools for understanding and analyzing failures in any given biomaterial. Specific

“Proceedings of the 2004 American Society for Engineering Education Annual Conference & Exposition Copyright © 2004, American Society for Engineering"

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Majewski, T., & vadiraja, S. (2004, June), Teaching About Micromechanics Of Fracture And Other Failure Analysis Approaches For Biomaterials Paper presented at 2004 Annual Conference, Salt Lake City, Utah. 10.18260/1-2--14009