2D stress-based analysis of a flattened Brazilian disc specimen using fem code ansys

A boundary element code DIGS was used in the numerical simulations of the experiments

Experimental results indicate that the tensile strength is strongly dependent on the specific test used for its evaluation

A 2-cm-long strain gage was placed in a Brazilian test specimen along its horizontal diametral plane

[A] ? [E]

[A]

[A]

[N-2D] ? [E]

[N-2D] ? [E]

[A] ? [N-2D]

[N-2D] ? [E]

[E]

[E]

Yu et al. (2006) Pointing out that the formula for the indirect tensile strength is inaccurate when the Brazilian disc has significant thickness. A 3D FEM stress analysis showed that size/shape effects existed in the Brazilian test when the disc thickness was increased

Stress analysis based on a 3D FEM program was used, and the influence of specimen thickness was considered

[N-3D]

Zhu and Tang (2006)

Studying the deformation and failure process of a Brazilian disk of heterogeneous rock subjected to static and dynamic loading conditions by numerical simulation based on rock failure process analysis (RFPA)

Considering rock heterogeneity by assuming that the material properties of elements conform to a Weibull distribution

[N-2D]

Ye et al. (2009) Presenting an analytical formula and an experimental method to obtain the tensile elastic modulus (E_t) of rock by using strain gages in the Brazilian splitting test

The ratios of E_t to E_c for marble, sandstone, limestone, and granite were about 60–90 %, where E_c is the compressive elastic modulus

[A] ? [E]

Lanaro et al. (2009)

Discussing the influence of initiated cracks on the stress distribution, and modeling the crack initiation and propagation of Brazilian rock specimens subjected to indirect tensile loading

A boundary element method (BEM) code (FRACOD2D) was used to model the Brazilian tests

[N-2D]

Table 1 continued

Authors (year) Contributions Remarks Methods

Yu et al. (2009) Presenting a modified Brazilian disk test by using two special spacers at the loading points to reduce the stress concentrations. Pointing out that the traditional Brazilian test seriously underestimates the tensile strength of the tested material

3D fem stress analysis was adopted by assuming that the test material is a continuous, isotropic, and homogeneous elastic body

[N-3D] ? [E]

Tavallali and Vervoort (2010a, b)

Markides et al. (2010, 2011)

Markides and Kourkoulis (2012)

Erarslan and Williams (2011)

Erarslan et al. (2011)

Presenting the effects of layer orientation (anisotropy) on the Brazilian tensile strength and failure patterns in the Brazilian test. The influences of microscale parameters on the macroscale behavior were discussed

Obtaining closed full-field solutions for the stresses and displacements in a Brazilian disk under uniformly distributed radial load and considering the influence of a uniform distribution of friction stress at the loading rims. Pointing out that the fracture may start at the edge of the load contact points rather than at the specimen center

Giving analytic full-field formulae for the components of the stress field developed in a Brazilian disc under four types of loading distribution on the actual contact length

Presenting experimental results for an investigation of the stress–strain characteristics of Brisbane tuff disc specimens under diametral compressive cyclic loading