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首页> 外文期刊>Experimental Mechanics >Numerical Modeling of Elastic Spherical Contact for Mohr-Coulomb Type Failures in Micro-Geomaterials
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Numerical Modeling of Elastic Spherical Contact for Mohr-Coulomb Type Failures in Micro-Geomaterials

机译：微观材料中Mohr-Coulomb型故障弹性球面接触的数值模拟

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AbstractThe contact behavior for geological materials, such as reservoir shale rock, is simulated using the finite element method by considering a nano-indenter tip indenting into a geomaterial obeying the Mohr-Coulomb failure criterion. The deformation and slip at the micro-scale along the shear direction in grain-to-grain contact follows the Coulomb frictional/sliding failure criterion, while the linear elastic force-displacement law is enforced in the direction normal to the contact surface. A series of simulations are performed to study the effect of cohesion, friction angle, and tensile strength on the contact response. For a material with very high cohesion and frictionless contact, the indented geomaterial behaves almost purely as an elastic medium. In this case, the indentation process converges to the classic Hertz grain-to-grain spherical contact model. For a material with extremely low cohesion, the geomaterial behaves like cohesionless granular material at the micro-scale. For materials with finite cohesion values, such as shales, the force-displacement responses are analyzed and reported. This simulation is compared to micro-indentation tests using a spherical indenter tip conducted on preserved samples of Woodford shale.
机译：<标题>抽象 ara id =“par1”>通过将纳米压印尖端缩进遵守Mohr的纳米压头尖端来模拟水库页岩岩体等地质材料的接触行为-coulomb失败标准。沿着纹理到晶粒接触中的剪切方向的微级变形和滑动跟随库仑摩擦/滑动故障标准，而线性弹性力 - 位移律在垂直于接触表面的方向上强制执行。进行一系列模拟以研究内聚力，摩擦角和拉伸强度对接触响应的影响。对于具有非常高的内聚力和无摩擦接触的材料，凹进的地质材料几乎纯粹是弹性介质。在这种情况下，压痕过程会聚到经典的赫兹粒子球形球面接触模型。对于具有极低凝聚力的材料，地质材料在微尺寸下表现得像粘性颗粒材料。对于有限凝聚力值的材料，例如Shales，分析和报道了力 - 位移响应。将该模拟与使用在伍德福德页岩的保存样本上进行的球形压痕尖端进行微压缩试验。

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