Finite Element Analysis of Electro-Thermal Coupling of Sandstone Under Lightning Currents

Rao, P; Xiang, Y; Ouyang, P; Nimbalkar, S; Chen, Q

Finite Element Analysis of Electro-Thermal Coupling of Sandstone Under Lightning Currents

Rao, P Xiang, Y Ouyang, P Nimbalkar, S

Chen, Q

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Publisher:: Springer Nature
Publication Type:: Journal Article
Citation:: Geotechnical and Geological Engineering, 2022, 40, (5), pp. 2593-2604
Issue Date:: 2022-05-01

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Field	Value	Language
dc.contributor.author	Rao, P
dc.contributor.author	Xiang, Y
dc.contributor.author	Ouyang, P
dc.contributor.author	Nimbalkar, S https://orcid.org/0000-0002-1538-3396
dc.contributor.author	Chen, Q
dc.date.accessioned	2023-03-30T00:24:10Z
dc.date.available	2023-03-30T00:24:10Z
dc.date.issued	2022-05-01
dc.identifier.citation	Geotechnical and Geological Engineering, 2022, 40, (5), pp. 2593-2604
dc.identifier.issn	0960-3182
dc.identifier.issn	1573-1529
dc.identifier.uri	http://hdl.handle.net/10453/168815
dc.description.abstract	In order to examine the thermal effect of lightning currents on sandstone, an electro-thermal coupling model based on electromagnetic field and heat transfer theory was constructed. This model considers the spatial Gaussian distribution of lightning current. The model is validated by comparing field observations and theoretical analyses from the previously published studies. The transient calculation is performed to investigate the dynamic change process within the sandstone during lightning strikes, and the effects of related factors such as the peak current of the lightning current, waveform parameters, and electrothermal parameters of the sandstone on the model results are analysed. The results indicate that a lightning strike generates a large amount of electromagnetic heat in the sandstone, causing it to heat up and melt or even vaporize. The entire dynamic process exhibits a logarithmic growth tendency, with rapid development of temperature and phase change areas during the early stages of lightning current, followed by gradual increases until constant. The temperature varies most dramatically around the lightning strike point, and the area affected by lightning strikes decreases as the horizontal plane deepens. Within the sandstone, both the temperature isosurface and phase transition area show a hemispherical distribution. When the peak current is greater, the wave front time is shorter, the half-value time is longer, the resistivity is greater, or the specific heat is more, the overall temperature in the sandstone is greater, and the phase change region is larger under the same conditions.
dc.language	en
dc.publisher	Springer Nature
dc.relation.ispartof	Geotechnical and Geological Engineering
dc.relation.isbasedon	10.1007/s10706-022-02048-2
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering
dc.subject.classification	Geological & Geomatics Engineering
dc.title	Finite Element Analysis of Electro-Thermal Coupling of Sandstone Under Lightning Currents
dc.type	Journal Article
utslib.citation.volume	40
utslib.for	0905 Civil Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access	*
dc.date.updated	2023-03-30T00:24:09Z
pubs.issue	5
pubs.publication-status	Published
pubs.volume	40
utslib.citation.issue	5

Abstract:

In order to examine the thermal effect of lightning currents on sandstone, an electro-thermal coupling model based on electromagnetic field and heat transfer theory was constructed. This model considers the spatial Gaussian distribution of lightning current. The model is validated by comparing field observations and theoretical analyses from the previously published studies. The transient calculation is performed to investigate the dynamic change process within the sandstone during lightning strikes, and the effects of related factors such as the peak current of the lightning current, waveform parameters, and electrothermal parameters of the sandstone on the model results are analysed. The results indicate that a lightning strike generates a large amount of electromagnetic heat in the sandstone, causing it to heat up and melt or even vaporize. The entire dynamic process exhibits a logarithmic growth tendency, with rapid development of temperature and phase change areas during the early stages of lightning current, followed by gradual increases until constant. The temperature varies most dramatically around the lightning strike point, and the area affected by lightning strikes decreases as the horizontal plane deepens. Within the sandstone, both the temperature isosurface and phase transition area show a hemispherical distribution. When the peak current is greater, the wave front time is shorter, the half-value time is longer, the resistivity is greater, or the specific heat is more, the overall temperature in the sandstone is greater, and the phase change region is larger under the same conditions.

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http://hdl.handle.net/10453/168815