Research Article

The Influence of Loading Rate on Direct and Indirect Tensile Strengths: Laboratory and Numerical Methods

Table 1

Micro and macro mechanical parameters of sandstone specimens.

MicroparametersValueMacro parametersValue

Particle radius range (mm)0.45–0.75Uniaxial compression strength (MPa)66.2
Particle contact modulus (GPa)21
Particle normal/shear stiffness (GPa)21
Friction coefficient0.25Young’s modulus (GPa)19.8
Normal strength of the flat-joint contact (MPa)2.5
Shear strength of the flat-joint contact (MPa)28