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R-curve behavior in notched beam tests of rocks |
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| Authors: | L.E.T Ferreira T.N BittencourtJ.L.A.O Sousa R Gettu |
| Affiliation: | a Escola Politécnica, Universidade de São Paulo, Av. Prof. Alm. Prado, 83, São Paulo, SP 05508-900, Brazil b Universidade Estadual de Campinas, Av. Albert Einstein, 951, Campinas, SP 13084-971, Brazil c Universitat Politècnica de Catalunya, Edificio C1, Jordi Girona 1-3, Barcelona 08034, Spain |
| Abstract: | The R-curve for sandstone is obtained from the load-crack mouth opening response of notched specimens subjected to three-point-bending. This approach is used to analyze the fracture behavior under monotonic and cyclic loading. The asymptotic limit of the R-curve compares well with the fracture toughness determined through an effective crack model. The analysis of the relaxation observed before the unloading-reloading cycles in the cyclic tests leads to the conclusion that the fracture toughness remains practically constant while the crack propagates slightly during the load drop. |
| Keywords: | R-curve Fracture toughness Three-point bending tests Rock fracture Relaxation |
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