Optimization of clamped beam geometry for fracture toughness testing of micron-scale samples

Jaya, Nagamani B and Bhowmick, Sanjit and Asif, Syed SA and Warren, Oden L and Jayaram, Vikram (2015) Optimization of clamped beam geometry for fracture toughness testing of micron-scale samples. In: PHILOSOPHICAL MAGAZINE, 95 (16-18). pp. 1945-1966.

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Abstract

Fracture toughness measurements at the small scale have gained prominence over the years due to the continuing miniaturization of structural systems. Measurements carried out on bulk materials cannot be extrapolated to smaller length scales either due to the complexity of the microstructure or due to the size and geometric effect. Many new geometries have been proposed for fracture property measurements at small-length scales depending on the material behaviour and the type of device used in service. In situ testing provides the necessary environment to observe fracture at these length scales so as to determine the actual failure mechanism in these systems. In this paper, several improvements are incorporated to a previously proposed geometry of bending a doubly clamped beam for fracture toughness measurements. Both monotonic and cyclic loading conditions have been imposed on the beam to study R-curve and fatigue effects. In addition to the advantages that in situ SEM-based testing offers in such tests, FEM has been used as a simulation tool to replace cumbersome and expensive experiments to optimize the geometry. A description of all the improvements made to this specific geometry of clamped beam bending to make a variety of fracture property measurements is given in this paper.

Item Type:	Journal Article
Publication:	PHILOSOPHICAL MAGAZINE
Publisher:	TAYLOR & FRANCIS LTD
Additional Information:	Copy right for this article belongs to the TAYLOR & FRANCIS LTD, 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND
Keywords:	microbeam bending; focused ion beam; fracture toughness; finite element modelling; in situ electron microscopy
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	31 Jul 2015 13:03
Last Modified:	31 Jul 2015 13:03
URI:	http://eprints.iisc.ac.in/id/eprint/51952

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