TY - GEN

T1 - Influence of the microstructure on rock damage during microwave irradiation: A 3D numerical analysis

AU - Toifl, Michael

AU - Meisels, Ronald

AU - Hartlieb, Philipp

AU - Kuchar, Friedemar

AU - Antretter, Thomas

PY - 2015

Y1 - 2015

N2 - A comprehensive 3D simulation research of the stress formation on the microstructure level of hard rocks due to microwave irradiation applied in microwave assisted rock breakage is presented. The specific aim of the present work is to investigate the influence of microstructural details in inhomogeneous rocks. In order to use a realistic rock model, a two component 3D microstructure is generated. The two components are microwave absorbing and transparent, respectively. In the first step of the simulation chain the electric field inside the inhomogeneous rock is obtained by a 3D finite difference time domain (FDTD) calculation. In a subsequent thermo-mechanical finite element (FE) simulation the stresses generated by 15 s heating with 25 kW are obtained. High stresses on the boundaries of the microwave absorbing phase exceeding the tensile strength are observed. Finally, the numerical results are corroborated by microwave experiments performed on granite samples.

AB - A comprehensive 3D simulation research of the stress formation on the microstructure level of hard rocks due to microwave irradiation applied in microwave assisted rock breakage is presented. The specific aim of the present work is to investigate the influence of microstructural details in inhomogeneous rocks. In order to use a realistic rock model, a two component 3D microstructure is generated. The two components are microwave absorbing and transparent, respectively. In the first step of the simulation chain the electric field inside the inhomogeneous rock is obtained by a 3D finite difference time domain (FDTD) calculation. In a subsequent thermo-mechanical finite element (FE) simulation the stresses generated by 15 s heating with 25 kW are obtained. High stresses on the boundaries of the microwave absorbing phase exceeding the tensile strength are observed. Finally, the numerical results are corroborated by microwave experiments performed on granite samples.

M3 - Conference contribution

SN - 978-3-9503898-1-4

SP - 731

EP - 736

BT - Future Development of Rock Mechanics

A2 - Schubert, Wulf

A2 - Kluckner, Alexander

PB - Österreichische Gesellschaft für Geomechanik

CY - Salzburg

ER -