High-Voltage Electric Pulse Fragmentation Methods

High-voltage electric pulse fragmentation encompasses a suite of techniques in which short, intense electrical discharges induce plasma channels and associated shock waves to fragment solids. When a sufficiently strong electric field is applied across a gap or within a liquid medium, dielectric breakdown occurs and a conductive plasma channel forms. The rapid expansion of this channel generates high-amplitude pressure waves that initiate and propagate cracks through brittle materials such as rock, concrete or composite structures. Key advantages include the absence of mechanical abrasion, minimisation of tool wear and the potential for targeted energy delivery that reduces overall energy consumption. Applications span deep geological drilling—where electropulse boring and plasma-pulse geo-drilling offer higher rates of penetration in hard rock—to the recycling of complex composites, where electrohydraulic or electrodynamic fragmentation separates constituent layers without chemical additives. Progress in this field relies on integrated modelling of the discharge circuit, plasma dynamics and solid failure criteria, as well as on experimental validation in representative materials. Recent advances have explored the influence of pore structure, pulse parameters and electrode design on fracture efficiency, underscoring the global significance of electric pulse methods for more sustainable excavation, mineral processing and material recovery.

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Research from all publishers

A numerical investigation of plasma-pulse geo-drilling has elucidated how pore fluid, pore geometry and pulse voltage jointly determine the onset of dielectric breakdown and subsequent rock fracturing. Simulations reveal that larger pore sizes and higher permittivity solids favour local plasma formation, with threshold voltages near 400 kV required for effective fracture initiation in model granites. These insights guide optimisation of pulse rise time and electrode spacing to maximise drilling efficiency.

In experimental and numerical studies of plasma channel drilling, a probabilistic evolution and thermo-mechanical coupling model has characterised crack initiation and growth around the channel in heterogeneous granite. Findings indicate that increased channel temperature accelerates crack onset, while intragranular shear cracks dominate damage patterns. Comparisons of complete versus partial breakdown show deeper channel penetration under partial conditions, informing bit design and electrical parameter selection for geothermal and mining applications.

A comparative assessment of high-voltage discharge methods for thin-film photovoltaic modules has contrasted electrohydraulic and electrodynamic fragmentation in water. Both approaches effectively delaminate copper indium diselenide modules, but electrohydraulic fragmentation at lower voltages offers equivalent separation efficiency with reduced system complexity. The study underscores the importance of total pulse energy over peak voltage for cost-effective composite recycling.

High-Voltage Electric Pulse Fragmentation Methods publication trend

The graph below shows the total number of articles in high-voltage electric pulse fragmentation methods across all publications each year (not limited to Nature Index journals).

Technical terms

Dielectric breakdown: Rapid ionisation of an insulating medium under a high electric field, leading to plasma formation.

Plasma channel: Conductive pathway created by ionised gas or fluid between electrodes during a high-voltage discharge.

Shock wave: A high-pressure mechanical wave produced by the rapid expansion of a plasma channel.

Electropulse Boring (EPB): A rock-breaking method using high-voltage pulses to induce fragmentation without mechanical abrasion.

Plasma Pulse Geo-Drilling (PPGD): A contactless drilling technique that exploits plasma-induced stress to fracture rock.

Electrohydraulic fragmentation: Material separation achieved by electric discharges in a liquid medium, generating shock waves.

Electrodynamic fragmentation: Direct solid fragmentation by rapid electric discharge in air or vacuum, relying on electromechanical forces.

References

1. Numerical Modeling of the Effects of Pore Characteristics on the Electric Breakdown of Rock for Plasma Pulse Geo Drilling. Energies (2021).
2. Benchmark Comparison of High Voltage Discharge Separation of Photovoltaic Modules by Electrohydraulic and Electrodynamic Fragmentation. Recycling (2018).
3. The fragmentation mechanism of granite in electrical breakdown process of plasma channel drilling. Geomechanics and Geophysics for Geo-Energy and Geo-Resources (2023).