Technical gazette, Vol. 27 No. 2, 2020.
Preliminary communication
https://doi.org/10.17559/TV-20180630123624
Pre-Peak Deformation and Damage Features of Sandstone under Cyclic Loading
Chengjie Li
; School of Civil and Architectural Engineering, Anhui University of Science and Technology, 232001 Huainan, China
Peijie Lou
; 1) School of Civil and Architectural Engineering, Anhui University of Science and Technology, 232001 Huainan, China, 2) Opening Laboratory for Deep Mine Construction, Henan Polytechnic University, 454000 Jiaozuo, China, 3) Center for Post-Doctoral Studies
Shuling Liang
; School of Civil and Architectural Engineering, Anhui University of Science and Technology, 232001 Huainan, China
Mingming Feng
; School of Civil and Architectural Engineering, Anhui University of Science and Technology, 232001 Huainan, China
Bin Pan
; School of Civil and Architectural Engineering, Anhui University of Science and Technology, 232001 Huainan, China
Abstract
In this paper, several sandstone specimens are prepared and subjected to uniaxial compression and cyclic loading. For each specimen, the loading segment of the stress-strain curve was fitted, and the peak slope of this segment was taken as the elastic modulus of the specimen in that cycle. It is learned that, under cyclic loading, the elastic modulus of each specimen increased with the growing number of load cycles, and tended to be stable; meanwhile, strain hardening was observed on all specimens. Moreover, the specimens are similar in corresponding stress, although varied in corresponding strain. In the same cycle, the tangent modulus of the loading phase was smaller than that of the unloading phase under the same stress. Finally, the damage variables of sandstone specimens under cyclic loading were defined from the angle of energy, revealing that the damage variables had logarithmic growth with the load cycles in the later stage.
Keywords
accumulation energy; damage variable; pre-peak phase; strain hardening
Hrčak ID:
236818
URI
Publication date:
15.4.2020.
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