Experimental analysis of the pseudo-compact tension (pCT) testing configuration using two alternative sample geometries
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Experimental analysis of the pseudo-compact tension (pCT) testing configuration using two alternative sample geometriesData
2021Cita bibliográfica
Herbón-Penabad, Muñoz-Ibáñez, Delgado-Martín. (2021). Experimental analysis of the pseudo-compact tension (pCT) testing configuration using two alternative sample geometries. IOP Conference Series: Earth and Environmental Science, 833(1). https://doi.org/10.1088/1755-1315/833/1/012033
Resumo
[Abstract:] The pseudo-compact tension (pCT) method recently proposed by Muñoz-Ibáñez et al. (2020) is a satisfactory approach to measure mode I fracture toughness (KIC) in rocks and other materials using disc-shaped samples loaded under pure tensile conditions. In contrast to other methods, such as the semi-circular bend (SCB) suggested by the ISRM (2014), the pCT test provides with good control after peak load, making it possible to further characterize the processes involved in fracture propagation. In this work we assess the influence of the testing configuration at the onset of unstable crack propagation. In order to extend the pCT concept to complementary geometries with potential interest we studied an alternative to the SCB specimen, which we call pseudo-SCB (pSCB). To compute KIC in this configuration we have derived the corresponding dimensionless stress intensity factor function (Y') based on the finite element method. The results show that the pSCB test provides with consistent values of KIC and it also allows to control the propagation of the crack beyond peak load, which reinforces the idea that the loading conditions may be a more determinant factor than the sample geometry in controlling post-peak behaviour. In addition, an expression of Y' is presented for cubic samples tested using the pCT approach. This configuration may be useful for testing other materials amenable of moulding such as mortar, concrete, ceramics, etc.
Palabras chave
Mode I fracture toughness (KIC)
Pseudo-compact tension (pCT)
Disc-shaped samples
Pure tensile conditions
Semi-circular bend (SCB)
Crack propagation
Pseudo-SCB (pSCB)
Stress intensity factor function (Y')
Finite element method
Cubic samples
Pseudo-compact tension (pCT)
Disc-shaped samples
Pure tensile conditions
Semi-circular bend (SCB)
Crack propagation
Pseudo-SCB (pSCB)
Stress intensity factor function (Y')
Finite element method
Cubic samples
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Atribución 3.0 España