Hysteresis Characteristics of Brittle Rock Deformation under Constant Load Cyclic Loading and Unloading

• Main Authors: Peijie Lou, Chengjie Li, Shuling Liang, Mingming Feng, Bin Pan
• Format: Article
• Language: English
• Published: Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek 2020-01-01
• Series: Tehnički Vjesnik
• Subjects: cyclic loading and unloading; deformation threshold; hysteresis deformation; recoverable deformation
• Online Access: https://hrcak.srce.hr/file/347081
• ISSN: 1330-3651; 1848-6339

This paper mainly explores the deformation characteristics of limestone specimens under constant load cyclic loading. For limestone specimens under uniaxial compression, the stress-strain curve can be divided into three stages: compaction stage, elastic stage and sudden failure stage. Under cyclic loading, the hysteresis loop on the stress-strain curve is long and thin, taking the shape of "toothpicks". The axial strain and radial strain both change with the stress amplitude and cycle number, but in different variation patterns. There is a stress amplitude "threshold" for radial deformation, indicating that the radial deformation is more sensitive to stress amplitude than the axial deformation. It is calculated that the incremental deformation between peaks includes both plastic deformation and the deformation recoverable after unloading, and the recoverable deformation is positively correlated with the load amplitude of the cyclic loading.