Abstract:This study focuses on unraveling the microphysical origins of the
nonlinear elastic effects, which are pervasive in the Earth’s crust.
Here, we examine the influence of grain shape and relative humidity (RH)
on the elastic nonlinearity of granular assemblies made of spherical
glass beads and angular sand particles. We find that their elastic
nonlinearity is of the same order of magnitude. However, while the
elastic nonlinearity of glass beads increases with RH, that of sand
particles is rather RH independent. … Show more
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