Relevant bibliographies by topics / Breakage mechanics

Academic literature on the topic 'Breakage mechanics'

Author: Grafiati
Published: 10 December 2022
Last updated: 20 February 2023

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Journal articles on the topic "Breakage mechanics"

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Einav, Itai. "Breakage mechanics—Part I: Theory." Journal of the Mechanics and Physics of Solids 55, no. 6 (June 2007): 1274–97. http://dx.doi.org/10.1016/j.jmps.2006.11.003.

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Wu, Bo, Yu Lin Yan, and Sebastian Münstermann. "Modelling of Chip Breakage in Machining Process with Damage Mechanics Model." Applied Mechanics and Materials 784 (August 2015): 411–18. http://dx.doi.org/10.4028/www.scientific.net/amm.784.411.

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Controlled chip breakage is important for machining process. In order to investigate the chip breakage behaviour in turning process, damage mechanics approach is applied in FE simulation of chip breakage. In this work, an advanced damage mechanics model is implemented for description of the plastic flow and damage behaviour of chip material in simulation. This material model takes the temperature, strain rate as well as state of stress into consideration, which are essential for application in machining processes.
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Einav, Itai. "Breakage mechanics—Part II: Modelling granular materials." Journal of the Mechanics and Physics of Solids 55, no. 6 (June 2007): 1298–320. http://dx.doi.org/10.1016/j.jmps.2006.11.004.

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Jian, Fuxian, Xiaomei Li, and Wanli Guo. "Modeling the Particle Breakage via Breakage Energy during Triaxial Shearing." Journal of Testing and Evaluation 51, no. 2 (October 5, 2022): 20220090. http://dx.doi.org/10.1520/jte20220090.

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Jiang, Hongxiang, Changlong Du, Songyong Liu, and Liping Wang. "Theoretical Modeling of Rock Breakage by Hydraulic and Mechanical Tool." Mathematical Problems in Engineering 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/895835.

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Rock breakage by coupled mechanical and hydraulic action has been developed over the past several decades, but theoretical study on rock fragmentation by mechanical tool with water pressure assistance was still lacking. The theoretical model of rock breakage by mechanical tool was developed based on the rock fracture mechanics and the solution of Boussinesq’s problem, and it could explain the process of rock fragmentation as well as predicating the peak reacting force. The theoretical model of rock breakage by coupled mechanical and hydraulic action was developed according to the superposition principle of intensity factors at the crack tip, and the reacting force of mechanical tool assisted by hydraulic action could be reduced obviously if the crack with a critical length could be produced by mechanical or hydraulic impact. The experimental results indicated that the peak reacting force could be reduced about 15% assisted by medium water pressure, and quick reduction of reacting force after peak value decreased the specific energy consumption of rock fragmentation by mechanical tool. The crack formation by mechanical or hydraulic impact was the prerequisite to improvement of the ability of combined breakage.
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Nguyen, Giang D., and Itai Einav. "The Energetics of Cataclasis Based on Breakage Mechanics." Pure and Applied Geophysics 166, no. 10-11 (June 30, 2009): 1693–724. http://dx.doi.org/10.1007/s00024-009-0518-x.

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Ravichandar, Krishnamurthy, R. Dennis Vigil, Rodney O. Fox, Stephanie Nachtigall, Andreas Daiss, Michal Vonka, and Michael G. Olsen. "Turbulent droplet breakage in a von Kármán flow cell." Physics of Fluids 34, no. 7 (July 2022): 073319. http://dx.doi.org/10.1063/5.0096395.

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Droplet dispersion in liquid–liquid systems is a crucial step in many unit operations throughout the chemical, food, and pharmaceutic industries, where improper operation causes billions of dollars of loss annually. A theoretical background for the description of droplet breakup has been established, but many assumptions are still unconfirmed by experimental observations. In this investigation, a von Kármán swirling flow device was used to produce homogeneous, low-intensity turbulence suitable for carrying out droplet breakage experiments using optical image analysis. Individual droplets of known, adjustable, and repeatable sizes were introduced into an isotropic turbulent flow field providing novel control over two of the most important factors impacting droplet breakage: turbulence dissipation rate and parent droplet size. Introducing droplets one at a time, large data sets were gathered using canola, safflower, and sesame oils for the droplet phase and water as the continuous phase. Automated image analysis was used to determine breakage time, breakage probability, and child droplet size distribution for various turbulence intensities. Breakage time and breakage probability were observed to increase with increasing parent droplet size, consistent with the classic and widely used Coulaloglou–Tavlarides breakage model (C–T model). The shape of the child drop size distribution function was found to depend upon the size of the parent droplet.
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Alonso, Eduardo E. "Fracture Mechanics and Rockfill Dams." Soils and Rocks 37, no. 1 (January 1, 2014): 3–35. http://dx.doi.org/10.28927/sr.371003.

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Rockfill behavior is dominated by particle breakage, a phenomenon which is analyzed from the perspective offered by the subcritical propagation of cracks within individual particles. Propagation velocity depends on stress concentration in particles as well as on the ambient Relative Humidity (RH). RH controlled oedometer and triaxial tests are reviewed and constitutive models reproducing the main features of observed behavior are outlined. The relevant issue of size effects is then introduced and some rules and possibilities to account for these effects in practice have been given. The Distinct Element Method is also a powerful tool to investigate rockfill behavior. Recent developments are described. The model developed incorporates particle breakage, delayed effects and the action of water. In the final part two real cases are presented: the response of a high rockfill embankment against a four year long rainfall regime and the analysis of Beliche dam. The lecture closes by a general discussion of partial saturation in granular materials ranging from coarse granular aggregates, such as rockfill, to clayey soils in an attempt to provide an integrated overview of water effects in soils.
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Yamazaki, Hidekatsu. "Breakage models: lognormality and intermittency." Journal of Fluid Mechanics 219, no. -1 (October 1990): 181. http://dx.doi.org/10.1017/s0022112090002907.

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Zhang, Yida, and Giuseppe Buscarnera. "Breakage mechanics for granular materials in surface-reactive environments." Journal of the Mechanics and Physics of Solids 112 (March 2018): 89–108. http://dx.doi.org/10.1016/j.jmps.2017.11.008.

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Dissertations / Theses on the topic "Breakage mechanics"

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Wang, Li Ge. "Particle breakage mechanics in milling operation." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28950.

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Milling is a common unit operation in industry for the purpose of intentional size reduction. Considerable amount of energy is consumed during a grinding process and much of the energy is dissipated as heat and sound, which often makes grinding into an energy-intensive and highly inefficient operation. Despite many attempts to interpret particle breakage during a milling process, the grindability of a material in a milling operation remains aloof and the mechanisms of particle breakage are still poorly understood. Hence the optimisation and refinement in the design and operation of milling are in great need of an improved scientific understanding of the complex failure mechanisms. This thesis aims to provide an in-depth understanding of particle breakage associated with stressing events that occur during milling. A hybrid of experimental, theoretical and numerical methods has been adopted to elucidate the particle breakage mechanics. This study covers from single particle damage at micro-scale to bulk comminution during the whole milling process. The mechanical properties of two selected materials, i.e. alumina and zeolite were measured by indentation techniques. The breakage test of zeolite granules subjected to impact loading was carried out and it was found that tangential component velocity plays an increasingly important role in particle breakage with increasing impact velocity. Besides, single particle breakage via in-situ loading was conducted under X-ray microcomputed tomography (μCT) to study the microstructure of selected particles, visualize the progressive failure process and evaluate the progressive failure using the technique of digital image correlation (DIC). A new particle breakage model was proposed deploying a mechanical approach assuming that the subsurface lateral crack accounts for chipping mechanism. Considering the limitation of existing models in predicting breakage under oblique impact and the significance of tangential component velocity identified from experiment, the effect of impact angle is considered in the developed breakage model, which enables the contribution of the normal and tangential velocity component to be rationalized. The assessment of breakage models including chipping and fragmentation under oblique impact suggests that the equivalent normal velocity proposed in the new model is able to give close prediction with experimental results sourced from the public literature. Milling experiments were performed using the UPZ100 impact pin mill (courtesy by Hosokawa Micron Ltd. UK) to measure the comminution characteristics of the test solids. Several parameters were used to evaluate the milling performance including product size distribution, relative size span, grinding energy and size reduction ratio etc. The collective data from impact pin mill provides the basis for the validation of numerical simulation results. The Discrete Element Method (DEM) is first used to model single particle breakage subject to normal impact loading using a bonded contact model. A validation of the bonded contact model was conducted where the disparity with the experimental results is discussed. A parametric study of the most significant parameters e.g. bond Young’s modulus, the mean tensile bond strength, the coefficient of variation of the strength and particle & particle restitution coefficient in the DEM contact model was carried out to gain a further understanding of the effect of input parameters on the single particle breakage behavior. The upscaling from laboratory scale (single particle impact test) to industrial process scale (impact pin mill) is achieved using Population Balance Modelling (PBM). Two important functions in PBM, the selection function and breakage function are discussed based on the single particle impact from both experimental and numerical methods. An example of predicting product size reduction via PBM was given and compared to the milling results from impact pin mill. Finally, the DEM simulation of particle dynamics with emphasis on the impact energy distribution was presented and discussed, which sheds further insights into the coupling of PBM and DEM.
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Papadopoulos, Dimitris G. "Impact breakage of particulate solids." Thesis, University of Surrey, 1998. http://epubs.surrey.ac.uk/804878/.

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Wei, Deheng. "Granular Mechanics Across Length Scales: Contact, Breakage, Fracture, and Permeability." Thesis, University of Sydney, 2021. https://hdl.handle.net/2123/24546.

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Particle morphology is of pivotal importance in granular materials at different length scales. This thesis begins with quantification and reconstruction of real particle shapes, then studies various kinds of granular material behaviour influenced by morphology features. The project background and related previous work are introduced in Chapters 1 and 2, respectively. Chapter 3 is firstly concentrated on reconstructing particle shapes using Spherical Harmonics (SH). DEM clumps are also used to approximate realistic particle shapes to simulate sand column collapse. The efficiency of SH analysis between different coordinate systems in FEM mesh qualities and reconstruction are also compared. Chapter 4 is on contact behaviour of rough spheres with different morphology features. Via FEM simulation, benchmarked with Hertzian solution, a semi-analytical model is proposed. In Chapter 5, to highlight the influences of contact curvature on single particle crushing behaviour, a rotational point loading in FDEM, benchmarked with an in-situ XCT experiment, is proposed. In Chapter 6, experiments of failure modes of cemented sands under different loading paths and the quantification of fracture fabric are conducted. FDEM simulations, benchmarked with a combined in-situ experiment with XCT and diffraction, of meso-scale concrete are also conducted. Effects of realistic aggregate morphology on overall concrete are investigated. In Chapter 7, permeability of uniformly graded 3D printed grains, is experimentally studied. Modified Kozney-Carman equation is also proposed. Chapter 8 concludes this work by summarising the findings and implications and provides an outlook on future works. This dissertation presents a new comprehensive understanding of granular behaviour influenced by its morphology features. Via the proposed framework combining both experimental and numerical information, it is helpful to design and optimise of various granular materials with specific morphology features.
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Collins-Craft, Nicholas Anton. "The effect of evolving micro-structural length scale on the macroscopic constitutive behaviour of granular media." Thesis, The University of Sydney, 2019. https://hdl.handle.net/2123/22200.

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Granular media are ubiquitous throughout the world and developing a comprehensive understanding of their behaviour is a pressing challenge. Of particular importance is accounting for the localisation of deformation into thin bands that feature intense grain crushing. This thesis develops a framework that predicts the formation of these bands and the grain size evolution, using experimental, theoretical and numerical approaches. Our experimental approach uses spatio-temporal plotting and Fourier analysis to extract information from photographs, allowing a sub-grain resolution of the velocity field. We investigate the effect of grain size polydispersity on the width of shear bands. Our theoretical approach develops a novel constitutive model that combines two existing formulations. We enrich Breakage Mechanics with the Cosserat continuum by an elastic upscaling that includes Cosserat state variables. This regularises Breakage Mechanics, allowing it to predict strain localisation phenomena such as shear bands, and adds physical fidelity to Cosserat models. Our numerical approach uses linear stability analysis and the finite element method to determine the conditions that result in strain localisation. The linear stability analysis gives the expected initial thickness and the initial post-localisation tendencies of the system. This information informs the finite element analysis, which is used to perform a rigorous post-localisation analysis. This thesis provides a framework which can be used to explore and further model the evolution of systems that experience strain localisation accompanied by intense grain crushing, ranging from standard laboratory tests to seismogenic faults.
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Campbell, Paul. "The application of the three-point bend test to predict rock mechanics and breakage parameters." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396456.

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Alaei, Ebrahim. "Hydrodynamic-plastic modelling of sand." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25046.

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This thesis focuses on proposing a novel comprehensively predictive modelling framework for granular materials which builds on the hydrodynamic procedure to satisfy the principles of thermodynamics, mass, momentum and energy conservations. In developing our physical arguments we recognise that complexity of the macroscopic mechanical response of granular media is mainly a result of kinematic degrees of freedom in granular scale. We therefore employ the original concept of two-stage irreversibility by Jiang and Liu (2009) and consider an energy sink from the mesoscopic granular entropy level to the microscopic thermal entropy level. In stark contrast from previous hydrodynamic formulations for granular materials, we establish a clear passage from the granular temperature to calibrate instead our model based on the measurable kinetic pressure. We introduce a novel coupling between the hydrodynamic formulation and plasticity theory by directly defining the evolution equations for state variables and imposing restrictions to ensure the non-negativity of the mechanical dissipation. Within our hydrodynamic-plastic framework, we construct two constitutive model variants. The first simpler model demonstrates remarkable capability to predict comprehensive rate-independent and rate-dependent phenomena, all while relying on only five previously defined mechanical constants. We enhanced the first model to capture particle breakage effects through integration with the breakage mechanics theory (Einav 2007). This more advanced model readily maintains all the rate-independent capabilities of the first one, and demonstrates remarkable agreement with elaborated experimental breakage data from monotonic and cyclic compression and shear tests. This thesis provides a foundation to explore and further model granular materials, as well as materials with complex internal heterogeneous mesoscopic structure, such as weakly cemented granular rocks, silts and clays.
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Smith, Susan B. "An investigation into the mechanism of dormancy-breakage." Thesis, University of Reading, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.255418.

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Andreatidis, J. P. "Breakage mechanisms and resulting mineral liberation in a bead mill /." [St. Lucia], 1995. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18026.pdf.

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Satish, Hemanth. "Exploring microwave assisted rock breakage for possible space mining applications." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=83932.

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As humanity prepares to migrate to the frontiers of the Moon and other planets, the area of mining in space must go along for the purpose of exploration and in-situ resource utilization. In the present work the literature that has been developed over the years in the area of mining in space as applicable to Lunar and Martian environments is reviewed. Subsequently, the key mining technologies that are most suitable for Lunar and Martian environments are identified. From the literature review, it is concluded that an optimal combination of both mechanical methods and novel energy (lasers, microwaves, nuclear energy) methods for rock destruction drawing a trade off between the energy and mass would be the most ideal option for space applications.
One such technique of applying low power microwaves to the rocks to thermally weaken them without actually melting them before employing mechanical methods of rock destruction is investigated. Finite element simulations were carried out to simulate microwave heating of a calcareous rock to determine the temperature profiles and thermal stresses at different microwave heating times and powers. Preliminary experiments were carried out in order to determine the microwave susceptibility of terrestrial basalt (which has similar composition as Lunar and Martian rocks). Temperature and strength of the rock sample before and after microwaving was measured.
The results of the finite element simulation indicated that a calcareous rock with microwave responsive phase and a microwave non-responsive phase developed thermal stresses of large magnitudes exceeding the actual strength of the rock. The simulation methodology can be applied to other rock types as well, provided the thermal, electrical and structural properties of constituent mineral phases are available.
The preliminary experimental results showed that the basalt rock specimens used were quite susceptible to the low power microwaves. There was a decreasing trend in terms of the point load index of the rock samples as the microwaving exposure times were increased, with some rock samples showing visible cracks at higher microwaving times.
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Li, Wenwu 1972. "Exploring the fundamentals of impact breakage events in grinding." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98987.

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Grinding in mineral processing is used to liberate valuable minerals from ore and prepare feed for mineral separation. It accounts for up to 50% of a concentrator's energy consumption. Ball mills are usually adopted in grinding processes; however their energy efficiency is low. Consequently, a small improvement can lead to important savings.
Population balance models can be used for ball mill optimization, but their use is limited because they are black box models based on incomplete information about the breakage events inside ball mills. Charge motion simulators, based on the discrete element method (DEM), not only provide information about charge media motion, but also collision energy distributions inside ball mills. Ball mill optimization can be achieved using charge motion simulators if the product size distribution can be predicted by linking charge motion results with single particle breakage tests.
Single particle drop tests were carried out to determine the effect of different levels of impact energy. Fundamental ore breakage model equations for an impact breakage event were established, and were applied for the drop weight tests based on a theoretical breakage mechanism. The energy consumptions are calculated with the given feed and product size distribution with the established equations. The comparison of two kinds of drop weight test devices were made and the effect of impact speeds of drop blocks on particle breakage at constant impact energy level was also discussed.
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Books on the topic "Breakage mechanics"

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Symposium on Rock Mechanics (8th 1966 University of Minnesota). Failure and breakage of rock: Proceedings of the eighth Symposium on Rock Mechanics held at the University of Minnesota, September 15-17th, 1966. New York, NY: American Institute of Mining, Metallurgical, and Petroleum Engineers, 1985.

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Haldimann, Matthias, Andreas Luible, and Mauro Overend. Structural use of Glass. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2008. http://dx.doi.org/10.2749/sed010.

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<p>Recent architectural trends and technological developments have brought about unprecedented opportunities and exciting changes in the use of glass in buildings. <p>Structural engineers currently have a bewildering array of glass products and configurations to choose from and a wide range of normal and exceptional loading conditions to consider, but very few unified reference texts for undertaking these tasks. This book attempts to redress this issue by providing an overview of the recent developments in this field thereby providing a basis for the understanding of the structural performance and design of glass in buildings. <p>Each chapter draws on the latest developments in practice and research and contains contributions from various international glass experts. The mix of general and specialist content ranging from rules of thumb to fracture mechanics and novel applications to post-breakage performance make this book useful to practitioners and researchers. Furthermore, the text is supplemented by tables of the major codes of practice and by an extensive list of references. <p>The book is primarily for structural engineers and researchers who have an interest in structural glass. It will be used by senior undergraduates, post-graduate students, researchers and practicing engineers.
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International Conference on Powders & Grains (3rd 1997 Durham, N.C.). Effect of particle size and bond strength in impact breakage of weak agglomerates Powders & grains 97: Proceedings of the third International Conference on Powders & Grains, Durham, North Carolina, 18-23 May 1997. Rotterdam: Balkema, 1997.

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Book chapters on the topic "Breakage mechanics"

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Nguyen, Giang D., and Itai Einav. "The Energetics of Cataclasis Based on Breakage Mechanics." In Mechanics, Structure and Evolution of Fault Zones, 1693–724. Basel: Birkhäuser Basel, 2009. http://dx.doi.org/10.1007/978-3-0346-0138-2_8.

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White, G. S., and W. Wong-Ng. "Molecular Orbital Calculations Comparing Water Enhanced Bond Breakage in Sio2 and Si." In Fracture Mechanics of Ceramics, 219–27. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4615-5853-8_17.

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Vullo, Vincenzo. "Tooth Flank Breakage Load Carrying Capacity of Spur and Helical Gears." In Springer Series in Solid and Structural Mechanics, 539–83. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38632-0_11.

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Xiaozhou, Liu, and Liu Peng. "Fracture Mechanics Analysis in Frost Breakage of Reservoir Revetment on cold regions." In Experimental and Applied Mechanics, Volume 6, 781–91. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9792-0_110.

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Zhou, Jian, Shicai Yu, Jin Zhang, and Cheng Zhao. "Experiment and Numerical Simulation on Contact and Breakage of Marble Particles." In Proceedings of GeoShanghai 2018 International Conference: Rock Mechanics and Rock Engineering, 145–57. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0113-1_17.

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Froehlich, Stephan J., Carlo A. Lackerbauer, Guenter Rudolph, Jan Rémi, Soheyl Noachtar, Werner J. Heppt, Annette Cryer, et al. "Nijmegen Breakage Syndrome." In Encyclopedia of Molecular Mechanisms of Disease, 1482–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-29676-8_1288.

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Wang, Yu. "Breakage Mechanism and Heat Transfer." In Springer Theses, 111–27. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6484-6_6.

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Zou, Dingxiang. "Mechanisms of Rock Breakage by Blasting." In Theory and Technology of Rock Excavation for Civil Engineering, 205–33. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1989-0_5.

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Kim, S. G., E. Y. Heo, H. G. Lee, W. Kim, B. B. Choi, H. W. So, and D. W. Kim. "A Regression Model for Tool Wear and Breakage Diagnosis." In Lecture Notes in Mechanical Engineering, 171–79. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-17629-6_19.

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Kinsella, Marcus, and Vineet Bafna. "Modeling the Breakage-Fusion-Bridge Mechanism: Combinatorics and Cancer Genomics." In Lecture Notes in Computer Science, 148–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29627-7_13.

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Conference papers on the topic "Breakage mechanics"

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Zhou, Xiang, Yida Zhang, and Gang Ma. "Deformation Analysis of the 233 m Shuibuya Rockfill Dam Using Breakage Mechanics." In Eighth International Conference on Case Histories in Geotechnical Engineering. Reston, VA: American Society of Civil Engineers, 2019. http://dx.doi.org/10.1061/9780784482070.026.

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Mansour, Alaa M., Edward W. Huang, Amal C. Phadke, and Shaosong S. Zhang. "Tension Leg Platform Survivability Analysis." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92434.

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In this paper, the survivability of a tension leg platform (TLP) under severe environmental conditions has been investigated. Survival conditions related to tendon damages are considered. Tendon damage conditions include tendon slacking condition, unpredicted increase in wave/wind condition after one tendon is removed and sudden tendon breakage. The effect of column spacing on the TLP survivability is also investigated and presented in this paper. Numerical results are presented for the tendon tension time histories including any tendon down-stroke or unlatching events. Based on the analysis results, recommendations are made to improve the survivability of the TLP under extreme environmental conditions.
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Nguyen, Ba Nghiep, Brian J. Tucker, and Mohammad A. Khaleel. "Damage in Short-Fiber Composites: From the Microscale to the Continuum Solid." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59129.

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This paper proposes a multiscale mechanistic approach to damage in short-fiber polymer composites (SFPC). At the microscale, the damage mechanisms are analyzed using micromechanical modeling, and the associated damage variables are defined. The stiffness reduction law dependent on these variables is then established. The macroscopic response is determined using thermodynamics of continuous media, continuum damage mechanics and finite element analysis. Final failure resulting from saturation of matrix microcracks, fiber/matrix debonding, fiber pull-out and breakage is modeled by a vanishing element technique. The model was validated using the experimental data and results from literature, as well as those obtained from a random glass/vinyl ester system.
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Pan, Yi, and Assimina A. Pelegri. "Finite Element Analysis on the Random Chopped Fiber Composites." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11571.

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A micro-mechanics based finite element analysis method for random chopped fiber composites is applied. A modified random sequential adsorption technique is developed to generate representative volume elements of the composites so to overcome the “jamming limit” in the existing techniques. A homogenization scheme is applied to acquire the effective elastic constants of the composite. Two damage mechanisms are considered, matrix cracking and interfacial debonding, which occur prior to fiber breakage and consequentially leading to catastrophic failure. The incremental plastic model and the cohesive zone model are adopted to account for matrix plasticity and interfacial debonding, respectively. The finite element analysis results are validated by experimental data.
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Yang, Chan K., Balakrishna Padmanabhan, John Murray, and M. H. Kim. "The Transient Effect of Tendon Disconnection on the Global Motion of ETLP." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57521.

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This paper deals with a numerical study of the transient effect of tendon disconnection on global performance of ETLP for harsh environmental condition in GoM (Gulf of Mexico). Twelve tendons support the platform with twelve production TTRs and one drilling riser attached by hydro-pneumatic tensioner. Charm3D, a program for global motion analysis of multiple floating hulls coupled with risers/mooring lines, is made to be capable of modeling the tendon disconnection at both top and bottom connection. The study includes the break due to high tension at the top and the unlatch due to negative tension at the bottom. A sudden disconnection of one or more tendons causes the unbalance of force and moment of the total system, only to cause the transient motion and tension as well as the mean offset. The breakage and the unlatch also make the different effects. The transient responses and the mean offsets are compared and discussed in the viewpoint of the safety of the system.
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Zhao, Dong, Rujian Ma, Weiqiang Wang, and Dongmei Cai. "Vibration Control of Offshore Platforms Using the Mega-Frame Theory." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67323.

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The successful use of mega-frame theory for big buildings on the ground to control the vibration reminds us to investigate a new kind of platform using the theory. The concept platform is made up of major columns and major beams. The major columns stand vertical and horizontal load. The major beams endure the horizontal load and averagely transfer the weight of the platform to the columns. The static analysis, mode analysis and simulation of vibration control are performed for the concept platform and other three types of platforms for comparisons. It is concluded that the concept platform is feasible in functionality since the platform has high holistic intensity and can avoid the partial breakage because of the columns of the MFPs being more equal burden under static loadings as compared with other kinds of platforms. It can also avoid the big distortion under the severe external loadings because of the MFPs having the equal mass and stiffness distribution. And the displacement of MFPs is very small under the randomexternal loadings. Furthermore, the MFPs will have similar structures and suitable for blocking manufacturing.
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DiAngelo, Denis J., Keith A. Vossel, Kevin T. Foley, and Y. Raja Rampersaud. "Biomechanical Stability of Multi-Level Inter-Body Cervical Strut-Graft Fusion With Posterior Plating Instrumentation." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0102.

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Abstract Strut-graft fusion with supplemental instrumentation is an accepted surgical treatment for multi-level cervical disease. There are many surgical methods for decompressing and reconstructing the cervical spine, e.g., anterior: multi-level discectomy, multi-level interbody strut-graft fusion (SG), multi-level strut-graft with anterior plate instrumentation, or posterior: multi-level laminectomy with posterior lateral mass plating instrumentation. A relatively new surgical approach that combines these methods is multi-level strut-graft fusion with posterior plating instrumentation (SGPP). Although the surgery should restore the mechanical integrity of the operated spine, little is known of the load-sharing mechanics between the SG and posterior instrumentation. Clinically, strut-grafted constructs fail by pistoning of the SG into the adjacent vertebrae, dislodgment of the SG at the vertebral interfaces, SG fracture, hardware breakage, or screw-plate extrusion. The objective of the study was to determine the biomechanical stability of SGPP spinal constructs and to study the influence of posterior plates on strut-graft loading mechanics in vitro.
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Pappu, Vijay, and Prosenjit Bagchi. "Capture, Deformation, Rolling and Detachment of a Cell on an Adhesive Surface in a Shear Flow." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67742.

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Three-dimensional computational modeling and simulation using front tracking method are presented on the motion of a deformable cell over an adhesive surface in a shear flow. The numerical method couples a Navier-Stokes flow solver with cell membrane mechanics, and a Monte Carlo simulation to capture stochastic formation and breakage of receptor/ligand bonds. The entire range of events during cell adhesion, namely, initial arrest of a free-flowing cell, slow rolling of an adherent cell, and detachment off the surface is simulated. Simulations are conducted to signify the role of hydrodynamic lift force that exists for a deformable particle in a wall-bounded flow. Three sets of numerical experiments are presented. In the first set, we consider the initial arrest of the cell, and show that the time needed for the cell to arrest increases with increasing Ca, but rapidly drops and saturates for higher bond strength. In the second set, we consider quasi-steady rolling motion of the cell, and predict the experimentally observed “stop and go” motion of the rolling leukocytes which is characterized by intermittent pauses and sudden jumps in cell velocity. In the third set we consider the detachment of the cell from the surface upon breakage of bonds. The bond strength needed to prevent the detachment of an adherent cell is computed and shown to be maximum for an intermediate Ca.
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Liu, Sheng, Xin Wu, Ronald Gibson, Xuefang Wang, Hong Hai Zhang, Zhiyin Gan, Jianwen Ren, and Bin Chen. "Impact Test and Simulation of Portable Electronic Devices: An Assessment." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-62506.

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Portable electronics devices are well known to be susceptible to drop impact which can cause various damage modes such as interconnect breakage, battery separation, possible cracking/debonding along interfaces, display damage, leaking in insulin pump, etc., Drop/impact performance of these products is one of important concerns of product design. Because of the small size of this type of electronics products, it is very expensive, time-consuming and difficult to conduct drop tests to directly detect the failure mechanisms and identify their drop behaviors. A brief review is given in terms of the development in testing standards, material modeling and structure modeling. Barriers and needs are given for both the measurement and modeling, with particular attention to the material rate dependent constitutive modeling, testing facilities development, and nonlinear contact mechanics modeling.
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Kazidenov, Daniyar, Furkhat Khamitov, and Yerlan Amanbek. "Coarse-Graining Methods for the Modified JKR Contact Model on a Triaxial Compression Test." In 56th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2022. http://dx.doi.org/10.56952/arma-2022-2211.

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ABSTRACT: The Discrete Element Method (DEM) modeled by coarse-graining approaches has been gaining importance in many applications including a triaxial compression test that represents the key micromechanical behaviors of deformable solids. In this work, the triaxial compression test has been investigated using a realistic particle-size distribution sample that replicates the weak cemented sandstone in Kazakhstan. The simulation was performed by the modified Johnson-Kendall-Roberts (JKR)-based DEM model with cohesive contact forces. According to the model, bonds between particles are broken at the maximum value of the normal contact force, and no new bonds are formed after the breakage. In this research, we implemented the coarse-graining methods for the modified JKR model. A scaling law was developed for each material parameter in the model such as density, surface energy density, Young’s modulus, Poisson’s ratio, friction and restitution coefficients . In addition, those approaches were combined with the same statistic weight (SSW) and same size parcel (SSP) scaling methods in order to scale the polydisperse particles. These combined methods are based on the conservation of mass and momentum by applying statistic weights to the particle diameters. First, the original particle simulation with the modified JKR settings was validated with the experimental data. Then, the stress-strain response and bonding behavior were compared between the original particle system and coarse-grained simulations. There is a good agreement between the results obtained from the original particle system and coarse-grained particle models. Moreover, the speedup of the coarse-grained simulations in parallel computing is achieved approximately 15 times faster than the original particle system with the same number of cores. 1. INTRODUCTION Sand production negatively affects the operation in the oil and gas industry. It usually occurs with weak unconsolidated sandstone reservoirs where the stress on the formation exceeds the mechanical strength of the rock, which leads to its failure. The produced sand blocks the flow line, destroys the equipment by erosion, and prevents access to the wellbore. As a result, the operational cost increases due to production limitations. The prediction of sand production optimizes the best strategy for sand control management to minimize those limitations.
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