Effect of cyclic loading and strain rate on the mechanical behaviour of sandstone

Ray, S. K.; Sarkar, Mayukh; Singh, T. N.

doi:10.1016/s0148-9062(99)00016-9

Cited by 155 publications

(52 citation statements)

References 11 publications

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“…According to formula (11), the damage variable is normalized while the damage variable D based on the cumulative energy of acoustic emission is obtained. e curve of the deviatoric stress and damage variable over time in the process of synchronous unloading under triaxial conditions is given.…”

Section: Simultaneous Unloading Damage Change Characteristicsmentioning

confidence: 99%

“…Meanwhile, they also analyzed the mechanical characteristics of stress paths in the unloading direction with axial loading. Ray et al [11] analyzed the strain and mechanical characteristics of sandstone under cyclic loading. Bagde and Petros [12] made a study about the fatigue characteristics and energy transformation of rock under cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

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Study on Mechanical Properties and Damage Evolution Law of Secondary Destruction Induced by Simultaneous Unloading after the Peak of the Curve of Sandstone

Xiao

Gang

Qianlong

2018

Shock and Vibration

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e research adopts the French ROCK600-50 three-axis experiment instrument and SH-II system to evaluate the acoustic emission (AE) peak of the rear axle of yellow sandstone by carrying out the confining pressure synchronous unloading experiment, and evolution of mechanical properties and characteristics of energy transformation and damage of a yellow sandstone, which is a twodamage process, the results of which have shown the following: (1) there are two damages appearing when the confining pressure is 5 MPa, 10 MPa, and 20 MPa. In contrast, these two damages do not appear when the confining pressure is 30 MPa and 40 MPa. e fracture degree and crack number of the two fractures are larger than those without two damages. (2) A failure stress release rate showed an obvious "√" trend. With the increase of confining pressure, the stress release rate of the two failures is increasing. (3) By keeping the strain of the body constant, it is determined to be the first time to destroy the warning. e two failures of rock are predicted by the inflection point of the axial strain slope. No two failures occurred, and the strain unloading process showed two characteristics. (4) Meanwhile, with the increase of confining pressure, the energy released from the peak decreases first and then increases; the law of releasing energy from one failure and two destructions is the opposite. No damage occurred two times. As the confining pressure increases, there is a continuous decrease of the energy released from the peak. As the confining pressure increases, the release rate of the primary energy decreases at first and then increases, and the rate of energy released two times is increasing. e plasticity coefficient shows the trend of increasing first and then decreasing. (5) e damage degree of the second rupture is greater than the first rupture.

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Section: Simultaneous Unloading Damage Change Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Mechanical Properties and Damage Evolution Law of Secondary Destruction Induced by Simultaneous Unloading after the Peak of the Curve of Sandstone

Xiao

Gang

Qianlong

2018

Shock and Vibration

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“…Ray et al (1999) report fatigue cycling of a sandstone at three strain rates. Singh et al (1989) performed uniaxial compression tests on sandstone and on marble at strain rates from 10 -6 to 10 3 /s, showing a systematic strength increase with strain rate.…”

Section: Triaxial Testingmentioning

confidence: 99%

Long-Term Mechanical Behavior of Yucca Mountain Tuff and its Variability, Final Technical Report for Task ORD-FY04-021

Daemen¹,

Ma²,

Zhao³

2006

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“…Previous studies, however, mostly support that the strength of rock decreases as a result of cyclic loading due to progressive damage of rock (Bieniawski 1967, Eberhardt et al 1999, Koseki et al 2003, Chen et al 2006, Xiao et al 2010). According to Ray et al (1998), the percentage decrease in uniaxial compressive strength increases with the number of cycles applied. Along with this, Singh (1989) discusses, however, that in some cases the applied stress level in cyclic loading does not cause rock failure during a very large number of cycles.…”

Section: Introductionmentioning

confidence: 99%

Degradation and improvement of mechanical properties of rock under triaxial compressive cyclic loading

Taheri

Hamzah

Dai

2017

JGS Special Publication

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An extensive experimental study on mechanical properties of a sandstone subjected to cyclic loadings are presented and discussed in this study. Cyclic loading test were performed in triaxial condition at confining pressure of 4 MPa. The mechanical properties of the rock were altered by cyclic loading; dependent upon the applied stress level during cyclic loading the rock may experience damage or hardening as a result of cyclic loading. It was identified that a critical maximum normalized deviator stress (i.e. deviator stress at the beginning of unloading normalized by rock peak strength) exists between 92-95% which defines the limit between hardening and damage behavior during cyclic loading. If the cyclic loading deviator stress is lower than this critical boundary, the peak strength my increase in postcyclic monotonic loading. This increase in peak strength is directly proportional to the normalized deviator stress in unloading; the amount of increase in peak strength decreases with a decrease in cyclic loading deviator stress. In cyclic damage tests, in general, the increase of Poisson's ratio, v, and the degradation of tangent Young's modulus, E tan , indicate the progressive accumulation of damage in the rock sample over the loading cycles. In cyclic hardening tests, however, v values for the cyclic hardening test remained fairly constant and E tan values slightly increased. Moreover, it was found that in cyclic damage tests the amount of axial and lateral strains cumulated during cyclic testing in much greater than those values for cyclic hardening tests.

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Effect of cyclic loading and strain rate on the mechanical behaviour of sandstone

Cited by 155 publications

References 11 publications

Study on Mechanical Properties and Damage Evolution Law of Secondary Destruction Induced by Simultaneous Unloading after the Peak of the Curve of Sandstone

Study on Mechanical Properties and Damage Evolution Law of Secondary Destruction Induced by Simultaneous Unloading after the Peak of the Curve of Sandstone

Long-Term Mechanical Behavior of Yucca Mountain Tuff and its Variability, Final Technical Report for Task ORD-FY04-021

Degradation and improvement of mechanical properties of rock under triaxial compressive cyclic loading

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