Effect of temperature on compressive and tensile strengths of salt

Abstract

A multi-axial strength criterion is developed to describe the distortional strain energy density of rock salt at failure as a function of the mean strain energy. The temperature effect on salt strength is implicitly considered by incorporating empirical relations between the elastic parameters and temperatures of the tested specimens. The proposed criterion agrees well with the test results obtained under temperatures ranging from 273-467 K. The proposed criterion is useful and practical for a conservative determination of the stability of compressed-air or gas storage caverns where the surrounding salt is subject to fluctuations of temperature during product injection and withdrawal periods.

Effects of loading rate and temperature on tensile strength and deformation of rock salt

“…The elastic modulus and Poisson's ratio used in the model are taken as 20 GPa and 0.40. They are obtained by Sriapai et al [15] who determined the mechanical properties on the same salt. Fig.…”

“…Sriapai et al [15] perform compressive strength testing on the same salt and conclude that under compression the salt elastic modulus linearly decreases with increasing temperatures. It is extrapolated here that the tensile elastic modulus of the salt also decreases linearly with increasing temperature…”

“…It is agreed that salt compressive strength increases with increasing applied loading rate and strain rate [6][7][8][9][10]. Elevated temperatures significantly increase the creep rate [11][12][13][14] and decrease the compressive strengths [15] of the salt. Numerous constitutive equations have been proposed to describe the time-dependent deformation and strength of salt under confinements and at elevated temperatures [1][2][3][4][5][6]10,11,13,15].…”

“…Elevated temperatures significantly increase the creep rate [11][12][13][14] and decrease the compressive strengths [15] of the salt. Numerous constitutive equations have been proposed to describe the time-dependent deformation and strength of salt under confinements and at elevated temperatures [1][2][3][4][5][6]10,11,13,15]. Study on the effect of temperature on the salt tensile strength and tensile creep deformation has however never been attempted.…”

Changes in friction, surface roughness, and tensile strength upon compaction of Ficus deltoidea powder

“…The tensile strength of the tablets can be explained using the principles of fracture mechanics 12 . It depends upon the internal distribution of flaws and cracks as well as the same features on the surface.…”