Estimation of the Fatigue Strength of Granite Subjected to Long-period Cyclic Loading.

Kodama, Junichi; Ishizuka, Yoshio; Abe, Tohru; Ishijima, Yoji; Goto, Tatsuhiko

doi:10.2473/shigentosozai.116.111

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…e fatigue life of rocks is related to the stress amplitude of cyclic loading [18][19][20][21], and the dynamic strength of rocks is related to the stress amplitude of cyclic loading and the stress upper limit of cyclic loading. Similarly, the dynamic strength of rocks is also affected by loading rate and the frequency of cyclic loading [22][23][24][25][26][27][28][29]. ere is a threshold value for rocks under cyclic loading, also known as critical strength.…”

Section: Introductionmentioning

confidence: 99%

Visco-Elastoplastic Constitutive Fatigue Model for Rocks

Liu

Rao

2020

Advances in Civil Engineering

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The study on the constitutive fatigue model for rocks under cyclic loading has an important significance in rock engineering. In order to study the fatigue properties of rocks under cyclic loading, according to the theory of rheological mechanics and the existing three basic one-dimensional fatigue elements, i.e., elastic, viscous, and plastic fatigue elements, the three-dimensional elastic, viscous, and plastic fatigue elements were constructed. Meanwhile, a fatigue yield criterion for rocks under cyclic loading was proposed, and a three-dimensional nonlinear visco-elastoplastic fatigue constitutive model (NVPFM) for rocks was established by using the flow criterion related to the proposed fatigue yield criterion. Compared with the test results of rocks under cyclic loading, the three-dimensional NVPFM could be used to describe the transient, steady-state, and tertiary creep phases of rocks under cyclic loading.

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Section: Introductionmentioning

confidence: 99%

Visco-Elastoplastic Constitutive Fatigue Model for Rocks

Liu

Rao

2020

Advances in Civil Engineering

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“…According to previous studies, the main factors affecting rock fatigue behaviour are rock lithology, water content, and cyclic loading characteristics (frequency, amplitude, wave form, and loading stress level). The wave forms (w f ) used for repetitive loads in fatigue tests include sinusoidal waves [8][9][10][11][12][13][14][15][16][17][18], triangular waves [8,[19][20][21][22][23][24][25], and square waves [23][24]. Previous study results indicate that the strain increment caused by the sinusoidal loading waveform is larger than that induced by the triangle loading waveform, and the applied input energy by sinusoidal loading waveforms was larger than that induced by triangle loading waveforms.…”

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confidence: 99%

Low amplitude fatigue performance of sandstone, marble, and granite under high static stress

Sun

Zhou

et al. 2021

Geomech. Geophys. Geo-energ. Geo-resour.

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Fatigue tests under high static pre-stress loads can provide meaningful results to better understand the time-dependent failure characteristics of rock and rock-like materials. However, fatigue tests under high static pre-stress loads are rarely reported in precious literatures. In this study, the rock specimens were loaded with a high static pre-stress representing 70% and 80% of the UCS, and cyclic fatigue loads with a low amplitude (i.e., 5%, 7.5% and 10% of the UCS) were applied. The results demonstrate that the fatigue life decreased as the static pre-stress level or amplitude of fatigue loads increased for all rock types, and the high static pre-stress affected the fatigue life greatly when the static pre-stress was larger than the damage stress of rocks in uniaxial compression test. The accumulative fatigue damage exhibited three stages during the fatigue failure process: crack initiation, uniform velocity, and acceleration, and so the fatigue modulus showed an "S-type" change trend. The lateral strain and volumetric strain had a much higher sensitivity to the cyclic loading and could be used to predict fatigue failure characteristics, and it was found that volumetric strain ε v = 0 is a threshold for microcracks coalescence and is an important value for estimating the fatigue life.

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