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Influence of inter-grain cementation stiffness on the effective elastic properties of porous Bentheim sandstone

Journal of Rock Mechanics and Geotechnical Engineering 2023年第3期15卷 573-583页

作者： Bin Chen Jiansheng Xiang John-Paul Latham Department of Earth Science and Engineering Faculty of EngineeringImperial College LondonLondonSW72BXUK

Effective elastic properties of porous media are known to be significantly influenced by *** this paper,we investigated the influence of another critical factor,the inter-grain cementation stiffness,on the effective elastic properties of a granular porous rock(Bentheim sandstone)using an advanced numerical workflow with realistic rock microstructure and a theoretical ***,the disparity between the experimentally tested elastic properties of Bentheim sandstone and the effective elastic properties predicted by empirical equations was ***,a micro-computed tomography(CT)-scan based approach was implemented with digital imaging software AVIZO to construct the 3D(three-dimensional)realistic microstructure of Bentheim *** microstructural model was imported to a mechanics solver based on the 3D finite element model with inter-grain boundaries modelled by cohesive *** simulations were run to test the effective elastic properties for different shear and normal intergrain cementation ***,a relation between the macroscale Young’s modulus and inter-grain cementation stiffness was derived with a theoretical model which can also account for porosity *** the numerical and theoretical results indicate the influence of the inter-grain cementation stiffness,on the effective elastic properties is significant for porous *** calibrated normal and shear stiffnesses at the inter-grain boundaries are 1.2×10^(5) and 4×10^(4) GPa/m,respectively.

关键词： Porous sandstone cohesive finite element model Grain-based model Rock microstructure Micro-computed tomography(CT)

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Real-time Detection and Explicit Fracture Simulation of Delamination in Composite Laminates under Impact Loading

Real-time Detection and Explicit Fracture Simulation of Dela...

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第十三届国际复合材料会议

作者： K.Minnaar M.Zhou School of Mechanical Engineering Georgia Institute of Technology Atlanta GA 30332-0405 U.S.A

A novel experimental technique is developed to determine the onset and evolution of delamination in fiber-reinforced composite laminates under impact loadingin real-time. Two Polytec laser vibrometers are used to measure the surface motions at two points on opposite surfaces of impacted specimens. The difference between the surface displacements, =D-D, is used to detect delamination. The laser vibrometer systems have a peak-to-peak velocity range of 20 m/s and a resolution of 10μm/s for velocity and a resolution of 0.32μm for displacement.

关键词： composite laminate low velocity impact real time detection laser interferometer cohesive finite element model

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