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Modeling and numerical analysis of granite rock specimen under mechanical loading and fire 被引量:1
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作者 Luc Leroy Ngueyep. Mambou joseph ndop Jean-Marie Bienvenu Ndjaka 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2015年第1期101-108,共8页
The effect of ISO 834 fire on the mechanical properties of granite rock specimen submitted to uniaxial loading is numerically investigated. Based on Newton's second law, the rate-equation model of granite rock specim... The effect of ISO 834 fire on the mechanical properties of granite rock specimen submitted to uniaxial loading is numerically investigated. Based on Newton's second law, the rate-equation model of granite rock specimen under mechanical load and fire is established. The effect of heat treatment on the me- chanical performance of granite is analyzed at the center and the ends of specimen. At the free end of granite rock specimen, it is shown that from 20 ~C to 500 ~C, the internal stress and internal strain are weak; whereas above 500 ~C, they start to increase rapidly, announcing the imminent collapse. At the center of specimen, the analysis of the internal stress and internal strain reveals that the fire reduces the mechanical performance of granite significantly. Moreover, it is found that after 3 min of exposure to fire, the mechanical energy necessary to fragment the granite can be reduced up to 80%. 展开更多
关键词 Granite rock specimenHigh temperatureInternal stressInternal strainISO 834 fire
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Displacements, Strains, and Stresses Investigations in an Inhomogeneous Rotating Hollow Cylinder Made of Functionally Graded Materials under an Axisymmetric Radial Loading
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作者 Elise Rose Atangana Nkene Luc Leroy Mambou Ngueyep +2 位作者 joseph ndop Emma Sandring Djiokeng Jean-Marie Bienvenu Ndjaka 《World Journal of Mechanics》 2018年第3期59-72,共14页
In this paper, an analytical and numerical study of strain fields, stress fields and displacements in a rotating hollow cylinder, whose walls were completely made in Functionally Graded Materials (FGM), was conducted.... In this paper, an analytical and numerical study of strain fields, stress fields and displacements in a rotating hollow cylinder, whose walls were completely made in Functionally Graded Materials (FGM), was conducted. We have considered the rotating hollow cylinder submitted to an asymmetric radial loading. It is assumed that, because of the functional graduation of the material, the mechanical properties such as Young elastic modulus and the density varies in the radial direction, in accordance with a the power law function. The inhomogeneity parameter was selected between -1 and 1. On the basis of the second law of Newton, Hooke’s law and the strain-stress relationship, we established the differential equation which governs the equilibrium for a rotating hollow cylinder. We found the analytical solution and compared to the numerical solution obtained by using the shooting method and the fourth order Runge-Kutta algorithm. The analytical and numerical results lead to the conclusion that the magnitude of the tangential stresses is greater than that of the radial stresses. The changes due to the graduation of FGM does not produce consistent variations in the distribution of radial stresses, but strongly affects the distribution of tangential stresses. The tangential stresses, tangential strains and displacements are much higher at the inner surface of the cylinder wall. The internal radial pressure intensely affects the radial stresses and the radial strain. 展开更多
关键词 Functionally GRADED Materials RADIAL Stresses Tangential Stresses Cylinder Wall
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Modeling and numerical analysis of granite rock specimen under mechanical loading and fire
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作者 Luc Leroy Ngueyep.Mambou joseph ndop Jean-Marie Bienvenu Ndjaka 《岩石力学与工程学报》 EI CAS CSCD 北大核心 2015年第1期101-108,共8页
The effect of ISO 834 fire on the mechanical properties of granite rock specimen submitted to uniaxial loading is numerically investigated. Based on Newton's second law, the rate-equation model of granite rock spe... The effect of ISO 834 fire on the mechanical properties of granite rock specimen submitted to uniaxial loading is numerically investigated. Based on Newton's second law, the rate-equation model of granite rock specimen under mechanical load and fire is established. The effect of heat treatment on the mechanical performance of granite is analyzed at the center and the ends of specimen. At the free end of granite rock specimen, it is shown that from 20 C to 500 C, the internal stress and internal strain are weak; whereas above 500 C, they start to increase rapidly, announcing the imminent collapse. At the center of specimen, the analysis of the internal stress and internal strain reveals that the fi re reduces the mechanical performance of granite signi fi cantly. Moreover, it is found that after 3 min of exposure to fi re,the mechanical energy necessary to fragment the granite can be reduced up to 80%. 展开更多
关键词 GRANITE ROCK SPECIMEN High temperature INTERNAL stress INTERNAL strain ISO 834 FIRE
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