Study of Mechanical Property of Rock under Uniaxial Cyclic Loading and Unloading

Through studying the mechanics, energy, and deformation features of rock under uniaxial cyclic loading and unloading, the findings are as follows: (1) under cyclic loading and unloading, the curve of stress and strain for loading and unloading in every cycle was not superposition reciprocally but fo...

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Published in:Advances in civil engineering 2018-01, Vol.2018 (2018), p.1-6
Main Authors: Zhang, Meng, Zhang, Yidong, Ji, Ming, Guo, Hongjun
Format: Article
Language:English
Subjects:
Civil engineering
Coal mining
Crack initiation
Cyclic loads
Damage accumulation
Deformation
Elasticity
Engineering
Hysteresis loops
Knee
Marble
Materials fatigue
Mechanical properties
Mechanics
Parameter estimation
Stone
Strain
Studies
Superposition (mathematics)
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Ji, Ming
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description Through studying the mechanics, energy, and deformation features of rock under uniaxial cyclic loading and unloading, the findings are as follows: (1) under cyclic loading and unloading, the curve of stress and strain for loading and unloading in every cycle was not superposition reciprocally but formed an acutifoliate hysteresis loop. The distribution of the hysteresis loop became denser with the cycles and moved toward the direction of strain increasing. (2) The area of the hysteresis loop indicated the inner damage degree of rock. And the hysteresis energy accumulated was stronger; the damage of rock was more serious. Furthermore, the hysteresis energy grew linearly along with load, and the hysteresis energy accumulated had a trend exponential growth with cycle continuing. (3) The elasticity modulus grew in the form of logarithm as a whole. In each cycle, elasticity modulus for unloading was greater than that for loading. When it exceeded a certain value, elasticity modulus for reloading was less than elasticity modulus for unloading. (4) The cyclic loading and unloading had a strength impact that was gradually stronger and stronger as the cycle went on the sample of rock.
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The distribution of the hysteresis loop became denser with the cycles and moved toward the direction of strain increasing. (2) The area of the hysteresis loop indicated the inner damage degree of rock. And the hysteresis energy accumulated was stronger; the damage of rock was more serious. Furthermore, the hysteresis energy grew linearly along with load, and the hysteresis energy accumulated had a trend exponential growth with cycle continuing. (3) The elasticity modulus grew in the form of logarithm as a whole. In each cycle, elasticity modulus for unloading was greater than that for loading. When it exceeded a certain value, elasticity modulus for reloading was less than elasticity modulus for unloading. 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subjects Civil engineering
Coal mining
Crack initiation
Cyclic loads
Damage accumulation
Deformation
Elasticity
Engineering
Hysteresis loops
Knee
Marble
Materials fatigue
Mechanical properties
Mechanics
Parameter estimation
Stone
Strain
Studies
Superposition (mathematics)
title Study of Mechanical Property of Rock under Uniaxial Cyclic Loading and Unloading
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