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Effect of Loading Rate and Surface Conditions on the Flexural Strength of Borosilicate Glass

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Abstract:

This study evaluates the loading rate and surface condition dependence of the flexural strength of a borosilicate glass. The glass specimens are subjected to three different surface treatments before four-point bending tests to study the effect of surface flaws. Quasistatic (Material Test System 810) and dynamic (Kolsky bar) experiments are performed at loading rates ranging from 0.7 to 4 × 106 MPa/s. The results show that the flexural strength of the borosilicate glass has a strong dependence on the loading rate. A chemically etched surface produces an enhanced flexural strength by about an order of magnitude. Scanning electron microscopy images on fracture surfaces indicate that the failure is governed by different types of flaws under different surface treatment conditions. Edge failure is also identified for samples possessing high flexural strength.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2009.03019.x

Affiliations: 1: AAE and MSE Schools, Purdue University, West Lafayette, Indiana 47907-2045 2: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6068 3: US Army Tank and Automotive Research and Development, Warren, Michigan 48397-5000

Publication date: June 1, 2009

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