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Indexed by:期刊论文

Date of Publication:2015-04-01

Journal:COMPUTERS AND CONCRETE

Included Journals:SCIE

Volume:15

Issue:4

Page Number:673-686

ISSN No.:1598-8198

Key Words:fracture mechanics; size effect law; energy release rate; R-curve

Abstract:R-curve based on the size effect law previously developed for geometrically similar specimens (geometry type III) is extended to geometries with variable depth (geometry type I) as well as with variable notch (geometry type II), where the R-curve is defined as the envelope of the family of critical strain energy release rates from specimens of different sizes. The results show that the extended R-curve for type I tends to be the same for different specimen configurations, while it is greatly dependent on specimen geometry in terms of the initial crack length. Furthermore, the predicted load-deflection responses from the suggested R-curve are found to agree well with the testing results on concrete and rock materials. Besides, maximum loads for type II specimen are predicted well from the extended R-curve.