Publicacións

@article{perez-rey_size_2023,

title = {Size effects on the tensile strength and fracture toughness of granitic rock in different tests},

author = {Ignacio Pérez-Rey and Andrea Muñoz-Ibáñez and Manuel A. González-Fernández and Mauro Muñiz-Menéndez and Miguel Herbón-Penabad and Xian Estévez-Ventosa and Jordi Delgado-Martín and Leandro R. Alejano},

url = {https://www.sciencedirect.com/science/article/pii/S1674775522002293},

doi = {10.1016/j.jrmge.2022.11.005},

issn = {1674-7755},

year  = {2023},

date = {2023-09-01},

urldate = {2026-08-10},

journal = {Journal of Rock Mechanics and Geotechnical Engineering},

volume = {15},

number = {9},

pages = {2179–2192},

abstract = {This study investigates the tensile failure mechanisms in granitic rock samples at different scales by means of different types of tests. To do that, we have selected a granitic rock type and obtained samples of different sizes with the diameter ranging from 30 mm to 84 mm. The samples have been subjected to direct tensile strength (DTS) tests, indirect Brazilian tensile strength (BTS) tests and to two fracture toughness testing approaches. Whereas DTS and fracture toughness were found to consistently grow with sample size, this trend was not clearly identified for BTS, where after an initial grow, a plateau of results was observed. This is a rather complete database of tensile related properties of a single rock type. Even if similar databases are rare, the obtained trends are generally consistent with previous scatter and partial experimental programs. However, different observations apply to different types of rocks and experimental approaches. The differences in variability and mean values of the measured parameters at different scales are critically analysed based on the heterogeneity, granular structure and fracture mechanics approaches. Some potential relations between parameters are revised and an indication is given on potential sample sizes for obtaining reliable results. Extending this database with different types of rocks is thought to be convenient to advance towards a better understanding of the tensile strength of rock materials.},

keywords = {Finite fracture mechanics, Fracture toughness, Granite, Size effect, Tensile strength},

pubstate = {published},

tppubtype = {article}

}

@article{Muñoz-Ibáñez20203267,

title = {Pure Mode I Fracture Toughness Determination in Rocks Using a Pseudo-Compact Tension (pCT) Test Approach},

author = {Andrea Muñoz-Ibáñez and Jordi Delgado-Martín and Miguel Costas and Juan R. Rabuñal-Dopico and Jose Alvarellos-Iglesias and Jacobo Canal-Vila},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85083511678&doi=10.1007%2fs00603-020-02102-6&partnerID=40&md5=c56334e844a4145ad7c2718dbee6ea9f},

doi = {10.1007/s00603-020-02102-6},

issn = {07232632},

year  = {2020},

date = {2020-01-01},

urldate = {2020-01-01},

journal = {Rock Mechanics and Rock Engineering},

volume = {53},

number = {7},

pages = {3267-3285},

publisher = {Springer},

abstract = {Mode I fracture toughness (KIC) quantifies the ability of a material to withstand crack initiation and propagation due to tensile loads. The International Society for Rock Mechanics (ISRM) has proposed four suggested methods for determining KIC. However, these methods present some drawbacks such as insufficient post-peak control, complex sample preparation and considerable material requirements. Here we present an alternative approach, called the pseudo-compact tension (pCT) method, to measure KIC in rocks using disc-shaped specimens loaded in pure tension. The pCT specimen has favourable features such as a simple geometry, small sample volume and minimal machining requirement. The tensile load is transmitted to the specimen through two high-strength, high-stiffness steel jaws that fit into a U-shaped groove cut in the specimen. An additional thin straight notch is introduced to act as a stress concentrator. The crack propagates from the notch tip along the ligament plane, splitting the specimen into two halves. The effects of specimen size and notch length on KIC are determined by testing specimens 100, 50 and 38 mm in diameter with different notch length ratios (0.1 ≤ a/b ≤ 0.4). Tests were performed under ambient conditions and a slow loading rate (0.1 mm/min). Our results show that the pCT method is convenient for the assessment of KIC of both fragile and ductile rocks. The method offers good control even beyond the maximum load, making it possible to study the post-peak behaviour of the material. © 2020, Springer-Verlag GmbH Austria, part of Springer Nature.},

note = {cited By 14},

keywords = {Ambient conditions; Compact tension; Crack initiation and propagation; International society; Material requirements; Mode-i fracture toughness; Simple geometries; Stress concentrators, crack propagation; fracture toughness; rock mechanics; sample preparation; testing method, Cracks; High strength steel; Rock mechanics; Rocks; Tensile stress, Fracture toughness},

pubstate = {published},

tppubtype = {article}

}