Comparative study of Weibull characteristic strength and mean strength of GPCs to confirm the minimum number of samples needed for confident strength reporting. (March 2015)

• Record Type: Journal Article
• Authors: Mehrvar, Cina; Curran, Declan J.; Alhalawani, Adel M.F.; Boyd, Daniel; Towler, Mark
• Is Part Of: Journal of the mechanical behavior of biomedical materials. Volume 43(2015)
• Page Start: 53
• Page End: 58
• Publication Date: 2015-03
• Subjects: Glass polyalkenoate cements -- Biaxial flexure -- Weibull -- Mean -- SEM -- Fracture; Biomedical materials -- Periodicals; Biomedical materials -- Mechanical properties -- Periodicals; Biomedical materials; Biomedical materials -- Mechanical properties; Periodicals; Electronic journals; 610.28
• DOI: 10.1016/j.jmbbm.2014.12.008
• Languages: English
• ISSNs: 1751-6161

Abstract

Abstract: This short communication determines the strength of two glass polyalkenoate cements that differ from each other through the composition of their glass phase. Sample sets of n =5, 10, 20 and 30 were formulated and tested in biaxial flexure. The derived mean for each sample set was compared against the Weibull characteristic strength. The mean and corresponding characteristic strength show a maximum percentage difference 10.1%, and the 95% confidence intervals calculated from the mean data encompass the corresponding characteristic strength down to a sample set of n =5. This suggests that, for brittle materials such as glass polyalkenoate cements, it is acceptable to test only five samples of each material in biaxial flexure and the resultant 95% confidence intervals will encompass the corresponding Weibull characteristic strength of the material.