Cracking of granitic rock by high frequency-high voltage-alternating current actuation of piezoelectric properties of quartz mineral: 3D numerical study

Saksala, Timo

doi:10.1016/j.ijrmms.2021.104891

Cited by 8 publications

(8 citation statements)

References 28 publications

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confidence: 91%

“…One such method uses high-voltage and high-frequency alternating current (HV-HF-AC) excitation of piezoelectric properties of Quartz in granite to induce cracking by the converse piezoelectric effect. Saksala [6] carried out a numerical feasibility study on this new method and showed that it has some promise. Namely, damage in the form of cracks was inflicted on cylindrical rock samples made of granite by sinusoidal AC excitation at the frequency of 100 kHz and the amplitude of 10 kV.…”

Section: Introductionmentioning

confidence: 99%

“…However, the study by Saksala [6] did not investigate the weakening effect due to the cracking induced by piezoelectric excitation on the tensile strength of the sample. Therefore, the present study addresses this important topic by a numerical study.…”

Section: Introductionmentioning

confidence: 99%

“…For this end, the numerical method based on 3D embedded discontinuity finite elements for rock fracture and the explicit time stepping scheme to solve the coupled piezoelectro-mechanical problem developed in ref. [6] is employed. This method accounts for rock heterogeneity and anisotropy at the mineral mesotructure level.…”

Section: Introductionmentioning

confidence: 99%

“…where the symbols meaning are: [6]). It should be noted that as the displacement jump is assumed elementwise constant, so that the expression for strain in (1) follows taking the gradient and adding the piezoelectric strain.…”

Section: Introductionmentioning

confidence: 99%

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Weakening of tensile strength of granitic rock by HV-HF-AC actuation of piezoelectric properties of Quartz: a 3D numerical study

Saksala

Ruiz

Kane

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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High-voltage and high-frequency alternating current (HV-HF-AC) excitation of piezoelectric properties of Quartz is a potential method to induce cracks in granite. This was recently shown in a numerical feasibility study [6], where cracking was induced on cylindrical rock samples made of granite by sinusoidal AC excitation at the frequency of ~100 kHz and the amplitude of ~10 kV. However, this study did not investigate the weakening effect due to this cracking on the tensile strength of the sample. The present study addresses this topic numerically. For this end, a numerical method based on 3D embedded discontinuity finite elements for rock fracture and an explicit time stepping scheme to solve the coupled piezoelectro-mechanical problem is adopted. Rock heterogeneity and anisotropy are accounted for at the mineral mesotructure level. A preliminary numerical simulation demonstrates that the HV-HF-AC treatment reduces the tensile strength of a cylindrical granite sample by 12 %, making it thus a potential non-conventional pre-treatment method in comminution and excavation of Quartz bearing rocks and ores.

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“…

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mentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Weakening of tensile strength of granitic rock by HV-HF-AC actuation of piezoelectric properties of Quartz: a 3D numerical study

Saksala

Ruiz

Kane

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Hydromechanical Modeling of High-Voltage Electropulse-Assisted Fluid Injection for Rock Fracturing

Ouyang

Rao

et al. 2023

Rock Mech Rock Eng

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Weakening of Compressive Strength of Granite by Piezoelectric Actuation of Quartz Using High-Frequency and High-Voltage Alternating Current: A 3D Numerical Study

et al. 2023

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Piezoelectric excitation of quartz mineral phase in granite using high-frequency and high-voltage alternating current (HF-HV-AC) is a potential new weakening pretreatment in comminution of rock. The present study addresses this topic numerically by quantifying the weakening effect on the compressive strength of granite. For this end, a numerical method based on a damage-viscoplasticity model for granite failure under piezoelectric actuation is developed. The rock material is modelled as heterogeneous and isotropic. However, the piezoelectric properties of quartz are anisotropic. The governing global piezoelectro-mechanical problem is solved in a staggered manner explicitly in time. Numerical simulations predict that the weakening effect on compressive strength of granite is 10% with the excitation frequency and voltage of 274.4 kHz and 150 kV of the pretreatment. As the weakening effect takes place at a natural frequency of the numerical rock sample, the quartz content has only a slight effect on the frequency at which maximum weakening occurs. Moreover, the weakening effect depends strongly on the orientation of the quartz crystals. In a more practical application of simulating low-rate compression of a sphere-shaped rock sample, a weakening effect of 8% after the HF-HV-AC pretreatment was predicted.

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Cracking of granitic rock by high frequency-high voltage-alternating current actuation of piezoelectric properties of quartz mineral: 3D numerical study

Cited by 8 publications

References 28 publications

Weakening of tensile strength of granitic rock by HV-HF-AC actuation of piezoelectric properties of Quartz: a 3D numerical study

Weakening of tensile strength of granitic rock by HV-HF-AC actuation of piezoelectric properties of Quartz: a 3D numerical study

Hydromechanical Modeling of High-Voltage Electropulse-Assisted Fluid Injection for Rock Fracturing

Weakening of Compressive Strength of Granite by Piezoelectric Actuation of Quartz Using High-Frequency and High-Voltage Alternating Current: A 3D Numerical Study

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