Anisotropic fracture and energy dissipation characteristics of interbedded marble subjected to multilevel uniaxial compressive cyclic loading

Wang, Yu; Han, Jiajun; Ren, Jie; Li, Changhong

doi:10.1111/ffe.13365

Cited by 10 publications

(8 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to reveal the structural deterioration and instability behavior of rock subjected to complex stress disturbance, a special designed cyclic loading path with varied fatigue loading frequency and stress amplitude is applied on rock. The loading path in this work is different from the previous studies 26–28,45 ; not only the loading amplitude but also the loading frequency is varied and not constant. Related studies about rock failure under increasing amplitude cyclic loads have been widely performed; however, the mechanical behaviors of rock under cyclic loading path with varied frequency are not well understood.…”

Section: Discussionmentioning

confidence: 83%

“…The formation of the hysteresis loop is the result of energy dissipation; it reflects the accumulative damage for the tested rock. According to the first law of thermodynamics, the total input strain energy U by the testing machine is transferred into the elastic energy U e and dissipated energy U d 26,36,37 . The strain energy of U , U e , and U d are obtained as

U goodbreak= \int_{ε_{1}}^{ε_{\max}} italicσdε goodbreak= \sum_{i = 1}^{n} \frac{1}{2} ((), σ_{i} goodbreak+ σ_{i + 1}) ((), ε_{i + 1} goodbreak- ε_{i}),

U_{e} goodbreak= \int_{ε_{1}}^{ε_{\max}} italicσdε goodbreak= \sum_{i = 1}^{n} \frac{1}{2} ((), σ_{i} goodbreak+ σ_{i + 1}) ((), ε_{i + 1}^{e} goodbreak- ε_{i}^{e}),

U_{d} goodbreak= U goodbreak- U_{e} goodbreak= \int_{ε_{1}}^{ε_{\max}} italicσdε goodbreak- \int_{ε_{2}}^{ε_{\max}} italicσdε .

…”

Section: Testing Resultsmentioning

confidence: 99%

“…Among those parameters influencing the rock cyclic or fatigue behaviors, the fatigue loading frequency and stress amplitude are two important factors that should be deep considered. Plenty of mechanical tests considering variable stress amplitude conditions have been performed on rock 26–28 . The pre‐existing rock engineering examples demonstrate that not only the stress amplitude but also the loading frequency is varied and not constant 29,30 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fatigue failure identification using deformation and energy rate for hole‐fissure contained granite under freeze–thaw and variable‐frequency–variable‐amplitude cyclic loads

Wang

Zhu

et al. 2021

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

This work conducted laboratory tests considering the coupled freeze–thaw (FT) and variable‐frequency–variable‐amplitude cyclic loads on granite containing two fissures and a circular hole. The analysis is dedicated to reveal the deformation and energy rate characteristics. Testing results show that increasing FT cycle and loading level both accelerate rock damage. The rock subjecting to high FT cycle behaves much larger damage rate in terms of volumetric strain and dissipated energy. The warning strength is defined according to the volumetric strain rate and dissipated energy rate which can early issue a warning than the crack damage stress point. In addition, the rock instability precursor is proposed by monitoring the incremental rate of the radial strain and volumetric strain; drastic damage occurs when the volumetric rate exceeds the radial rate. Three typical crack coalescence modes of double shear coalescence, single shear coalescence, and single tensile coalescence were revealed.

show abstract

Section: Discussionmentioning

confidence: 83%

U goodbreak= \int_{ε_{1}}^{ε_{\max}} italicσdε goodbreak= \sum_{i = 1}^{n} \frac{1}{2} ((), σ_{i} goodbreak+ σ_{i + 1}) ((), ε_{i + 1} goodbreak- ε_{i}),

U_{e} goodbreak= \int_{ε_{1}}^{ε_{\max}} italicσdε goodbreak= \sum_{i = 1}^{n} \frac{1}{2} ((), σ_{i} goodbreak+ σ_{i + 1}) ((), ε_{i + 1}^{e} goodbreak- ε_{i}^{e}),

U_{d} goodbreak= U goodbreak- U_{e} goodbreak= \int_{ε_{1}}^{ε_{\max}} italicσdε goodbreak- \int_{ε_{2}}^{ε_{\max}} italicσdε .

…”

Section: Testing Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fatigue failure identification using deformation and energy rate for hole‐fissure contained granite under freeze–thaw and variable‐frequency–variable‐amplitude cyclic loads

Wang

Zhu

et al. 2021

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

show abstract

“…Stress cycling was continued in this way until the sample eventually failed. For each dynamic cyclic loading level, 50 stress cycles were applied to the marble samples 7 Real‐time AE monitoring was used during rock fracturing process; a series of AE parameters, for example, waveform, AE count, AE energy, rise time, amplitude, frequency, and, were recorded.…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of fatigue crack propagation in interbedded marble under multilevel cyclic uniaxial compressive loads

Wang

Meng

Long

2020

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

Multilevel cyclic loading–unloading uniaxial compressive testing combined with real‐time acoustic emission monitoring (AE) and post‐test computed tomography (CT) scanning was employed to investigate the anisotropic cracking propagation and the type of crack classification for interbedded marble. An AE parameter method using RA (ratio of rise time to amplitude) and AF (ratio of AE counts to duration) is used to classify cracking event modes and propagation characteristics. Results show that the fatigue strength and lifetime first decreases and then increases with increasing interbed orientation, and they reach a minimum for rock with an interbed orientation of 30°. In addition, the distribution of RA values and AF values is strongly influenced by the rock structure, especially the interbeds. Moreover, CT imaging reveals the difference between the cracking mode and it is found that the cracking propagation pattern is structurally dependent. An increase of RA value provides an early warning for rock failure.

show abstract

“…Under the action of axial stress, the transverse tensile stress generates. When the transverse tensile stress exceeds the tensile limit of the rock, tensile failure occurs (Wang et al, 2021).…”

Section: Analysis Of Dolomite Failure Modes Under High-humidity Condi...mentioning

confidence: 99%

Uniaxial Compression Damage Mechanical Properties and Mechanisms of Dolomite Under Deep High-Humidity Condition

et al. 2022

View full text Add to dashboard Cite

The paper studies the uniaxial compression mechanical properties of pillars under the deep and high-humidity environment. We make the pillars cored from the −750 m mine room of Wengfu Phosphate Mine into the standard dolomite samples and test with a humidity control device developed by ourselves. Combining with uniaxial compression tests and microstructure inspections, we study the mechanical deterioration rule and damage mechanism of the dry samples and the wet ones that have been placed in a high-humidity condition (90% RH) for 30, 60 and 90 d, respectively. The results show that: 1) When the sample is placed in the humidity device, its original layered or sheet crystal morphology will change into sponge-like or flocculent morphology. As the placement time increases, the structure of the sample becomes looser and the boundaries between layers become blurred. The numbers of micro-cracks and micro-pores increase. 2) In the initial stage of water molecule intrusion (0–30 d), the strength and mass damages of the rock sample are less, and the damage rate is low. As high-humidity action time increases (30–90 d), the damage rates of both strength and mass gradually grow. 3) The failure modes of dolomites include shear failure and tensile/shear mixed failure, which are controlled by the storage time under high-humidity condition. As time goes by, more macroscopic cracks appear and the failure mode of the rock changes from shear to tensile. 4) Based on the X-ray diffraction and scanning electron microscopy analysis on mineral components, together with the principle of chemical kinetics, we discuss the chemical reaction process between dolomite and gaseous water molecules, and summarize the chemical damage mechanism of rocks during the water-rock interaction. The research has a certain guiding significance for the durability and stability prediction of pillars under deep high-humidity conditions.

show abstract

Anisotropic fracture and energy dissipation characteristics of interbedded marble subjected to multilevel uniaxial compressive cyclic loading

Cited by 10 publications

References 29 publications

Fatigue failure identification using deformation and energy rate for hole‐fissure contained granite under freeze–thaw and variable‐frequency–variable‐amplitude cyclic loads

Fatigue failure identification using deformation and energy rate for hole‐fissure contained granite under freeze–thaw and variable‐frequency–variable‐amplitude cyclic loads

Experimental investigation of fatigue crack propagation in interbedded marble under multilevel cyclic uniaxial compressive loads

Uniaxial Compression Damage Mechanical Properties and Mechanisms of Dolomite Under Deep High-Humidity Condition

Contact Info

Product

Resources

About