Multiphysics Simulations of Microwave Induced Damage Applied to Rock Samples of Varying Strength and Absorptivity

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
J. Allen, Reena Patel, Oliver W. Taylor
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引用次数: 0

Abstract

In this work, we show the development of a numerical model to investigate the 3D interactions between microwave radiation and basalt, granite, and sandstone rock samples. In particular, we assign sample heterogeneity based on the Weibull statistical distribution, and invoke a damage model for elemental tensile and compressive stresses based on the maximum tensile stress and the Mohr-Coulomb theories, respectively. Model implementation is facilitated by the use of COMSOL for use in coupling the electromagnetic, thermal, and solid displacement relations. Various parametric studies are conducted related to variable input power and waveguide port alignment, with model validation conducted with respect to damage resulting from a uniaxial compression test. The results indicate that relatively high induced temperatures will promote damage potential, but its impact must be placed within the context of the sample strength to quantify the true potential damage evolution of a given rock mass. As observed herein, a mechanically weaker rock may be prone to mechanical damage; however, it may also possess a relatively large relative permittivity, enabling it to absorb the least amount of microwave radiation thus yielding comparatively low overall damage profiles compared to a more mechanically competent rock mass.
不同强度和吸收率岩石样品微波损伤的多物理模拟
在这项工作中,我们展示了一个数值模型的发展,以研究微波辐射与玄武岩,花岗岩和砂岩岩石样品之间的三维相互作用。特别地,我们基于Weibull统计分布分配了样品的非均匀性,并分别基于最大拉应力和Mohr-Coulomb理论调用了元素拉伸和压缩应力的损伤模型。通过使用COMSOL来耦合电磁、热和固体位移关系,促进了模型的实现。我们进行了与可变输入功率和波导端口对准相关的各种参数研究,并对单轴压缩试验造成的损伤进行了模型验证。结果表明,相对较高的诱导温度会促进潜在的损伤,但其影响必须放在样品强度的背景下,才能量化给定岩体的真实潜在损伤演变。由此可见,力学性质较弱的岩石更容易发生力学损伤;然而,它也可能具有相对较大的相对介电常数,使其能够吸收最少的微波辐射,因此与机械性能更好的岩体相比,产生相对较低的总体损伤剖面。
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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