TIME-DEPENDENT BEHAVIOR OF CRUSHABLE MATERIALS IN ONE-DIMENSIONAL COMPRESSION TESTS

Particle crushing is a progressive phenomenon. This study examines time-dependent behavior due to particle crushing. A review of the literature was made to find evidence of time-dependent behavior due to particle crushing. Single particle crushing tests and one-dimensional compression tests were carried out on four crushable materials with careful visual observations. The mechanism of time-dependent compression was discussed. The following observations were made : (1) The time-dependent behavior under one-dimensional compression stems mainly from a repetitive cycle of crushing, rearrangement of particles and redistribution of contact stresses. (2) Crushing patterns and rearrangement in one-dimensional compression tests are different depending on the characteristics observed in single particle crushing tests.