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Letteratura scientifica selezionata sul tema "Deformations (Mechanics)"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 luglio 2024

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Articoli di riviste sul tema "Deformations (Mechanics)"

1

UBRIACO, MARCELO R. "QUANTUM DEFORMATIONS OF QUANTUM MECHANICS". Modern Physics Letters A 08, n. 01 (10 gennaio 1993): 89–96. http://dx.doi.org/10.1142/s0217732393000106.

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Based on a deformation of the quantum mechanical phase space we study q-deformations of quantum mechanics for qk=1 and 0<q<1. After defining a q-analog of the scalar product on the function space we discuss and compare the time evolution of operators in both cases. A formulation of quantum mechanics for qk=1 is given and the dynamics for the free Hamiltonian is studied. For 0<q<1 we develop a deformation of quantum mechanics and the cases of the free Hamiltonian and the one with a x2-potential are solved in terms of basic hypergeometric functions.

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2

Armstrong, Ronald W. "Bertram Hopkinson's pioneering work and the dislocation mechanics of high rate deformations and mechanically induced detonations". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372, n. 2015 (13 maggio 2014): 20130181. http://dx.doi.org/10.1098/rsta.2013.0181.

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Bertram Hopkinson was prescient in writing of the importance of better measuring, albeit better understanding, the nature of high rate deformation of materials in general and, in particular, of the importance of heat in initiating detonation of explosives. This report deals with these subjects in terms of post-Hopkinson crystal dislocation mechanics applied to high rate deformations, including impact tests, Hopkinson pressure bar results, Zerilli–Armstrong-type constitutive relations, shock-induced deformations, isentropic compression experiments, mechanical initiation of explosive crystals and shear banding in metals.

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3

Liu, Chuanbo, Chengqing Yuan e Shutian Liu. "The Effect of Intrinsic Mechanical Properties on Reducing the Friction-Induced Ripples of Hard-Filler-Modified HDPE". Polymers 15, n. 2 (4 gennaio 2023): 268. http://dx.doi.org/10.3390/polym15020268.

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Ripple deformations induced by friction on polymeric materials have negative effects on the entire stability of operating machineries. These deformations are formed as a response to contacting mechanics, caused by the intrinsic mechanical properties. High-density polyethylene (HDPE) with varying silicon nitride (Si3N4) contents is used to investigate different ripple deformation responses by conducting single-asperity scratch tests. The relationship between the intrinsic mechanical properties and the ripple deformations caused by filler modifications is analyzed in this paper. The results show the coupling of the inherent mechanical properties, and the stick-slip motion of HDPE creates ripple deformations during scratching. The addition of the Si3N4 filler changes the frictional response; the filler weakens the ripples and almost smoothens the scratch, particularly at 4 wt.%, but the continued increase in the Si3N4 content produces noticeable ripples and fluctuations. These notable differences can be attributed to the yield and post-yield responses; the high yield stress and strain-hardening at 4 wt.% provide good friction resistance and stress distribution, thus a smooth scratch is observed. In contrast, increasing the filler content weakens both the yield and post-yield responses, leading to deformation. The results herein reveal the mechanism behind the initial ripple deformation, thus providing fundamental insights into universally derived friction-induced ripples.

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4

Brovko, G. L. "Elements of nonlinear continuum mechanics in the modern theory". Izvestiya MGTU MAMI 9, n. 2-4 (20 luglio 2015): 34–43. http://dx.doi.org/10.17816/2074-0530-67114.

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The theoretical advancement in the field of modern nonlinear continuum mechanics is discussed. The paper includes elements of the mathematical apparatus, development of the foundations of a General tensor theory of mechanical processes and their representations, including generalization of concepts of objective derivatives and integrals, concepts of tensor measures of stresses and deformations, new approaches in theory of the resistance of solids to deformation.

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5

Tsai, M. Y., C. H. Huang e C. Y. Huang. "Hygrothermal Effect on Deformations of QFN Electronic Packaging". Journal of Mechanics 22, n. 4 (dicembre 2006): 271–79. http://dx.doi.org/10.1017/s1727719100000927.

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AbstractThe hygrothermal-mechanical behavior of a quad flat non-lead (QFN) package without a chip inside is investigated experimentally and numerically. The present study is focused on understanding the effect of the inherent hygrothermal behaviors of epoxy molding compound (EMC) on the deformations of QFN package. Prior to studying the package, the coefficient of moisture expansion for the EMC is measured experimentally. Full-field moiré and Twyman-Green interferometries are used for measuring the real-time in-plane and out-of-plane deformations of the specimen, respectively, under thermal and moisture loading. In addition, the finite element and theoretical analyses are adopted for validating the experimental observations and further understanding the hygrothermal mechanics of the specimen. The coefficient of moisture expansion of the EMC was experimentally obtained to be about 0.2. The experimental results of the full-field deformations of the specimen, due to temperature, moisture and a combination of both, are presented. The experimental observations are validated by the finite element and theoretical analyses. It was observed that the maximum moisture-induced deformation (strain) can be up to as large as 50% of the thermal deformation (strain) caused by ΔT = 50°C for the specimen. As a result, neglecting moisture-induced deformations (strains) would cause the significant amount of error in thermal deformation (strain) measurement of plastic packages. Furthermore, the present study has laid down the fundamental mechanics and approaches for the QFN packaging structural design and analysis in terms of hygrothermal effects.

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6

Dansereau, Véronique, Jérôme Weiss, Pierre Saramito e Philippe Lattes. "A Maxwell elasto-brittle rheology for sea ice modelling". Cryosphere 10, n. 3 (1 luglio 2016): 1339–59. http://dx.doi.org/10.5194/tc-10-1339-2016.

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Abstract. A new rheological model is developed that builds on an elasto-brittle (EB) framework used for sea ice and rock mechanics, with the intent of representing both the small elastic deformations associated with fracturing processes and the larger deformations occurring along the faults/leads once the material is highly damaged and fragmented. A viscous-like relaxation term is added to the linear-elastic constitutive law together with an effective viscosity that evolves according to the local level of damage of the material, like its elastic modulus. The coupling between the level of damage and both mechanical parameters is such that within an undamaged ice cover the viscosity is infinitely large and deformations are strictly elastic, while along highly damaged zones the elastic modulus vanishes and most of the stress is dissipated through permanent deformations. A healing mechanism is also introduced, counterbalancing the effects of damaging over large timescales. In this new model, named Maxwell-EB after the Maxwell rheology, the irreversible and reversible deformations are solved for simultaneously; hence drift velocities are defined naturally. First idealized simulations without advection show that the model reproduces the main characteristics of sea ice mechanics and deformation: strain localization, anisotropy, intermittency and associated scaling laws.

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7

Vispute, Devarsh M., Prem K. Solanki e Yoed Rabin. "Large surface deformation due to thermo-mechanical effects during cryopreservation by vitrification – mathematical model and experimental validation". PLOS ONE 18, n. 3 (9 marzo 2023): e0282613. http://dx.doi.org/10.1371/journal.pone.0282613.

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This study presents a simplified thermal-fluids (TF) mathematical model to analyze large surface deformations in cryoprotective agents (CPA) during cryopreservation by vitrification. The CPA deforms during vitrification due to material flow caused by the combined effects of thermal gradients within the domain, thermal contraction due to temperature, and exponential increase in the viscosity of the CPA as it is cooled towards glass transition. While it is well understood that vitrification is associated with thermo-mechanical stress, which might lead to structural damage, those large deformations can lead to stress concentration, further intensifying the probability to structural failure. The results of the TF model are experimentally validated by means of cryomacroscopy on a cuvette containing 7.05M dimethyl sulfoxide (DMSO) as a representative CPA. The TF model presented in this study is a simplified version of a previously presented thermo-mechanics (TM) model, where the TM model is set to solve the coupled heat transfer, fluid mechanics and solid mechanics problems, while the TF model omits further deformations in the solid state. It is demonstrated in this study that the TF model alone is sufficient to capture large-body deformations during vitrification. However, the TF model alone cannot be used to estimate mechanical stresses, which become significant only when the deformation rates become so small that the deformed body practically behaves as an amorphous solid. This study demonstrates the high sensitivity of deformation predictions to variation in material properties, chief among which are the variations of density and viscosity with temperature. Finally, this study includes a discussion on the possibility of turning on and off the TF and TM models in respective parts of the domain, in order to solve the multiphysics problem in a computationally cost-effective manner.

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8

Tang, Pengbin, Stelian Coros e Bernhard Thomaszewski. "Beyond Chainmail: Computational Modeling of Discrete Interlocking Materials". ACM Transactions on Graphics 42, n. 4 (26 luglio 2023): 1–12. http://dx.doi.org/10.1145/3592112.

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We present a method for computational modeling, mechanical characterization, and macro-scale simulation of discrete interlocking materials (DIM)---3D-printed chainmail fabrics made of quasi-rigid interlocking elements. Unlike conventional elastic materials for which deformation and restoring force are directly coupled, the mechanics of DIM are governed by contacts between individual elements that give rise to anisotropic deformation constraints. To model the mechanical behavior of these materials, we propose a computational approach that builds on three key components. ( a ): we explore the space of feasible deformations using native-scale simulations at the per-element level. ( b ): based on this simulation data, we introduce the concept of strain-space boundaries to represent deformation limits for in- and out-of-plane deformations, and ( c ): we use the strain-space boundaries to drive an efficient macro-scale simulation model based on homogenized deformation constraints. We evaluate our method on a set of representative discrete interlocking materials and validate our findings against measurements on physical prototypes.

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9

Fares, N. "Effective Mechanical Properties of Composites at Finite Deformations". Journal of Applied Mechanics 60, n. 1 (1 marzo 1993): 8–14. http://dx.doi.org/10.1115/1.2900784.

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A new representation theorem for the deformation gradient rate in the presence of cracks and kinematic constraints is presented. This representation theorem uses an extension of the concept of transformation strains to finite deformations. Based on the representation theorem the overall concentration factor was decomposed into contributions from the opening and sliding of cracks and from material nonhomogeneities. Also, inelastic deformations at the microscale were related to those at the macroscale through elastic concentration factors, where it was found that some of the elastic deformation at the microscale may contribute to the macroscale inelastic deformations.

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10

Frishter, Ludmila. "INFINITESIMAL AND FINITE DEFORMATIONS IN THE POLAR COORDINATE SYSTEM". International Journal for Computational Civil and Structural Engineering 19, n. 1 (29 marzo 2023): 204–11. http://dx.doi.org/10.22337/2587-9618-2023-19-1-204-211.

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The deformation problem of elasticity theory with regard to nonlinear deformations is examined. The expressions of deformations through displacements in the orthogonal curvilinear coordinate system are recorded. The relations for finite deformations in cylindrical and polar coordinate systems are derived. Physical relations for finite deformations and corresponding generalized stresses are recorded.

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Tesi sul tema "Deformations (Mechanics)"

1

Student, James John. "The Box Ankle and Ocmulgee shear zones of central Georgia: a study of geochemical response to Southern Appalachian deformation events". Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09192009-040411/.

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2

Wentworth, Stephen Thomas. "A qualitative study of planar elastic deformations". CSUSB ScholarWorks, 1994. https://scholarworks.lib.csusb.edu/etd-project/909.

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3

Pelillo, Enrico. "Scratch deformations of polymers". Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286438.

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4

Wadwalkar, Saurabh Sunil Jackson Robert L. "A study of elastic plastic deformation of heavily deformed spherical surfaces". Auburn, Ala., 2009. http://hdl.handle.net/10415/1957.

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5

Jiang, Tianci. "Impact & penetration studies simplified models and and materials design from AB initio methods /". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10443.

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In recent impact and penetration mechanical tests, steel projectiles (AISI4340) were impacted into targets like concrete with striking velocities (1200 m/s to 1500 m/s). Results indicated a material removal from the nose of the projectile, phase changes of the projectile materials, a reduction in the length of the projectile, and a blunting of the nose shape. These observations cannot be explained by current theories and numerical integration code that are used to study impact and penetration mechanics. Thus, the objectives of the thesis research are to (a) formulate and characterize the mechanisms responsible for the material erosion of the impacting projectile and the mass loss from the nose region; and (b) to determine the physical properties of alloy steels that are important to penetration mechanics from ab initio methods. The results can be used to design new projectile materials that can provide the desired penetration characteristics. These objectives are accomplished by investigating two related problems. The first problem is to formulate simplified models that can explain the penetration mechanics. The new models include the varying cross-section nose, changes of yield stress behind the shock wave and high strain rate phase transitions. Nose erosion effects, and time-dependent penetration path can be determined by integrating ODEs. A cavity expansion theory model is used to obtain the target resistance that is responsible slowing and deforming the penetrating projectile. The second problem concerns the determination of the constitutive relations from ab initio methods. The equation of state (EOS) and magnetic moments for alloy steels are investigated by using a special quasirandom structure technique and ab initio methods. Specifically, EOS for an interstitial disordered alloy Fe1-x-yNixCy is developed. First, the EOS of iron and phase transition of iron are studied and validated. Second, Nickel is considered to investigate the substitutional disordered alloy Fe1-x-yNixCy. Third, Carbon is placed at an interstitial position in the substitutional disordered alloy. These investigations will form foundation for future work involving new projectile with steel nose and shank made of multifunctional structural energetic materials.

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6

Okada, Hiroshi. "Boundary element methods for linear and nonlinear solid mechanics problems : and fracture toughness enhancement mechanisms in ceramic materials". Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/19169.

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7

Wang, Changxin. "Large deformation and no-tension analysis of selected problems in soil mechanics". Thesis, The University of Sydney, 2001. https://hdl.handle.net/2123/27804.

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The research carried out in this thesis is two-fold, covering the application of large deformation analysis in soil mechanics, and the problem of tensile failure of soil. The work may be conveniently divided into four sections. (1) Four large deformation analysis approaches have been implemented in the finite element package AFENA. Discussions of the advantages and limitations of the four approaches are given, based on the formulations adopted in these approaches and the results of analyses of some test problems. The applicability of the four approaches for some selected soil mechanics problems was investigated, by comparing the load—displacement curves predicted by these four approaches. (2) Large deformation analyses of strip and circular footings penetrating into layered clay, and of strip anchors uplifted in homogeneous and non—homogeneous clay, were carried out. The bearing or uplift capacity factors, load—displacement curves, failure zones, and stress distributions in the soil were investigated in the analyses. A wide range of soil parameters was adopted in the analysis, and the results presented cover a large variety of circumstances. The necessity of large deformation analysis of these problems is discussed, based on the comparisons of the results predicted by both small and large deformation analyses. (3) Soil tensile failure models were established for the problem of strip anchors uplifted in unsaturated and saturated soil, in terms of both total stress and effective stress. (4) The analyses adopting the soil tensile failure models were carried out for the problem of strip anchors uplifted in homogeneous or non-homogeneous soil. The significance of soil tensile failure on the uplift behaviour of anchors was investigated in a wide range of circumstances. It was found that the stress and strain formulations adopted in the four large deformation approaches make little difference to the predictions for the soil mechanics problems considered in this work. However, a distorted finite element mesh may affect the predictions of the numerical analysis significantly after a relatively large deformation occurs. Therefore a reliable large deformation analysis should handle mesh distortion properly. A large deformation analysis is able to capture the softening and hardening behaviour of the soil—structure system, while small deformation analysis can not predict this type of response. Whether a large deformation analysis is important for engineering practice depends on many factors, which include the magnitude of the geometry change, the soil strength profile, the initial position of the structure, the stiffness of soil and the soil self-weight. The analysis considering soil tensile failure for a strip anchor in homogeneous and non-homogeneous soil showed that the tensile failure reduces the uplift capacity from slightly to very significantly, depending on the particular conditions. The significance of tensile failure depends on the embedment depth of the anchor, the ratio of overburden pressure to shear strength, the soil strength gradient and the capacity of the pore fluid to sustain suction.

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Li, Jianxiong. "The lamellar structure and deformation mechanisms of [beta]-polypropylene". Click to view the E-thesis via HKUTO, 1997. http://sunzi.lib.hku.hk/hkuto/record/B31237368.

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9

Graham, Samuel Jr. "The stress state dependence of finite inelastic deformation behavior of FCC polycrystalline materials". Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/16802.

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10

Tanner, Albert Buck. "Modeling temperature and strain rate history effects in OFHC CU". Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/17143.

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Libri sul tema "Deformations (Mechanics)"

1

Ieşan, Dorin. Thermoelastic deformations. Dordrecht: Kluwer Academic, 1996.

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2

Michael, Ellis, e Geological Survey (U.S.), a cura di. 3D-DEF: a user's manual: A three-dimensional, boundary element modeling program. Denver, CO: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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3

Michael, Ellis, e Geological Survey (U.S.), a cura di. 3D-DEF: a user's manual: A three-dimensional, boundary element modeling program. Denver, CO: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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4

Michael, Ellis, e Geological Survey (U.S.), a cura di. 3D-DEF: a user's manual: A three-dimensional, boundary element modeling program. Denver, CO: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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5

Howell, Peter. Applied solid mechanics. Cambridge: Cambridge University Press, 2009.

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6

Besson, Jacques. Non-linear mechanics of materials. Dordrecht: Springer, 2010.

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7

Burhanettin, Altan, a cura di. Severe plastic deformation: Toward bulk production of nanostructured materials. New York: Nova Scince, 2005.

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8

1948-, François Dominique, a cura di. Structural components: Mechanical tests and behavioral laws. London: ISTE Ltd., 2007.

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9

Ogden, R. W. Non-linear elastic deformations. Mineola, N.Y: Dover Publications, 1997.

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10

A, Meyers Marc, Murr Lawrence Eugene e Staudhammer Karl P, a cura di. Shock waves and high-strain-rate phenomena in materials. New York: Marcel Dekker, 1992.

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Capitoli di libri sul tema "Deformations (Mechanics)"

1

Talpaert, Yves R. "Deformations". In Tensor Analysis and Continuum Mechanics, 171–261. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-015-9988-7_3.

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2

Ibrahimbegovic, Adnan. "Large displacements and deformations". In Nonlinear Solid Mechanics, 257–360. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2331-5_4.

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3

Strømmen, Einar N. "Deformations of Beams, Trusses and Frames". In Structural Mechanics, 97–110. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44318-4_5.

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4

Verruijt, Arnold. "Elastic Stresses and Deformations". In An Introduction to Soil Mechanics, 213–17. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61185-3_26.

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5

Romano, Antonio, e Addolorata Marasco. "Finite and Infinitesimal Deformations". In Continuum Mechanics using Mathematica®, 83–113. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-1604-7_3.

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6

Bauer, Svetlana, e A. Smirnov. "Thermo-elastic deformations of mirrors". In Asymptotic Methods in Mechanics, 163–74. Providence, Rhode Island: American Mathematical Society, 1993. http://dx.doi.org/10.1090/crmp/003/10.

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7

Bufler, H., R. Lautenbach e H. Schneider. "Thin Extensional Beams under Large Deformations". In Computational Mechanics ’86, 499–505. Tokyo: Springer Japan, 1986. http://dx.doi.org/10.1007/978-4-431-68042-0_66.

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8

Gaveau, Bernard, Julian Ławrynowicz e Leszek Wojtczak. "Statistical Mechanics of a Crystal Surface". In Deformations of Mathematical Structures II, 265–88. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1896-5_11.

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9

Bonetti, Elena, e Michel Frémond. "Incompressibility and Large Deformations". In Springer Series in Solid and Structural Mechanics, 187–205. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-48884-4_10.

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Pavilainen, Galina. "Elasto-plastic deformations of ribbed plates". In Asymptotic Methods in Mechanics, 227–33. Providence, Rhode Island: American Mathematical Society, 1993. http://dx.doi.org/10.1090/crmp/003/16.

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Atti di convegni sul tema "Deformations (Mechanics)"

1

Ganczarski, A. "Analysis of large deformations of long flexible bars". In Experimental Mechanics. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902578-2.

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Abstract. This work presents a comparison the results of the real deformation of a four-segment fly rod used to the feeder method with the results obtained from the theory and the FEM. The experiment of bending comprises preparation of the measuring path, in which the real fly rod is loaded by a series of forces subsequently changing both magnitude and inclination. The FEM model of the fly rod is based on the beam element and the variation of the cross-section is subjected to stepping approximation. The theoretical model takes advantage of the classical elliptic integral formulation applied to describe full curvature problem of long flexible bars. Dominant errors between the experimental data and numerical results come from essential difficulties in accurate measurement of the wall thickness as well as uncertainty of fibre carbon configuration.

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2

Pavilaynen, G. V., e N. V. Naumova. "Elastic-plastic deformations of SD-beams". In 2015 International Conference on Mechanics-Seventh Polyakhov's Reading. IEEE, 2015. http://dx.doi.org/10.1109/polyakhov.2015.7106764.

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3

Zhang, Z. X., W. B. Pan, S. F. Wang e Q. H. Lei. "Impact of Discontinuities with Slip-Weakening Friction on the Structural Deformation of a High-Speed Railway Tunnel inJointed Stratified Rock Masses Under Cyclic Train Loadings". In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0243.

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ABSTRACT It is crucial to assess the performance of a high-speed railway tunnel under dynamic train loading since structural deformations may lead to safety-relevant issues, such as train derailment or rollover. The structural deformation of a high-speed railway tunnel results from the train loading-induced response and interaction of tunnel structures and surrounding rock masses. Our research investigates the slippage behavior of discontinuities with slip-weakening friction around a tunnel under dynamic train loadings, and further analyzes their impacts on structural deformations. A distinct element method-based commercial software (UDEC) is used to build a 2D circular tunnel situated in jointed stratified rock masses. We compare the modeling results by the Coulomb slip model and slip-weakening model, and further conduct parametric studies about the bedding plane dip angle, joint length/spacing, and critical slip distance. We report that discontinuities with slip-weakening friction are more prone to be reactivated and ruptured under dynamic train loadings, and the resultant shear displacements of discontinuities associated with rock block deformations and movements would further induce significant structural deformations. Our simulation results have important implications for assessing the performance of a high-speed railway tunnel as well as the safety of train operations. INTRODUCTION The rapid development of high-speed railways in China, e.g., the planned Sichuan-Tibet railway line, imposes an increased demand of tunnel construction (Li et al. 2016). Due to the high performance requirements of high-speed train operation, the structural deformation of a tunnel should be carefully examined and controlled to ensure the safety and smoothness of train tracks (Fu et al. 2022; Qian et al. 2019). Some considerable structural deformations have been observed under dynamic train loadings (Wang et al. 2022), as a result of the interaction of tunnel structures and surrounding rock masses (Wang et al. 2020). Discontinuities are widely present in rock masses like stratified sedimentary formations, a typical lithology through which parts of the Sichuan-Tibet railway pass (Chen et al. 2019; Guo et al. 2020). It is expected that the potential shear slippage of these discontinuities under dynamic train loadings could play an important role in structural deformations.

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4

Zhang, Peter, Daniel Su, Mark Van Dyke e Bo Hyun Kim. "A Case Study of Shale Gas Well Casing Deformation in Longwall Chain Pillars Under Deep Cover". In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0082.

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ABSTRACT Shale gas wells in longwall chain pillars are subject to longwall-induced overburden movements. Longwall mining on either side of the chain pillars can induce deformations in gas well casings. The casing deformations induced by longwall mining has raised the safety concern that casing integrity might be diminished so that intrusive shale gas could leak into the longwall mine with serious consequences. This study deals with longwall-induced casing deformations of eight shale gas wells in the chain pillars between two adjacent longwall panels in the Pittsburgh coal seam under a cover depth of 314 m and a mining height of 2.1 m. The longwall panels were 457-m wide, and the chain pillars were 66-m wide. The longwall faces passed by the shale gas wells as each adjacent longwall panel was retreated. Gas well casing deformations were measured by a multi-finger caliper after each panel was mined. The first panel mining induced casing deformations less than 1.7 cm above the coal seam horizon. The second panel mining caused an increase of casing deformation up to 20%–30% on average. The casing deformations were also predicted by the FLAC3D modeling technique based on site-specific mining and geological conditions. The study demonstrates that the predicted casing deformations are generally in good agreement with the measurements. The study shows that the casing deformations first occur at the weak/strong rock interfaces after first panel mining and then increase by a small amount at the same locations after second panel mining. The study reveals that longwall-induced casing deformations under deep cover are smaller than those under shallow cover. The study also provides a quantitative method for using numerical modeling to assess the stability of shale gas wells in longwall chain pillars. INTRODUCTION Gas wells drilled in longwall pillars are influenced by longwall mining. Due to longwall-induced subsurface ground movements, the gas wells in the vicinity of longwall panels are subject to longwall-induced stresses and deformations. Excessive stresses and deformations induced in gas well casings could lead to a casing breach. More safety concerns have been focused on unconventional shale gas wells in the presumption that the casing breach could allow high-pressure gas to leak into the mine, potentially causing a fire and explosion. Over the past decade, more than 1,500 shale gas wells have been drilled in the current and future reserves of the Pittsburgh coal seam. The impact of longwall mining on these shale gas wells will have to be evaluated as future longwall panels are mined. Therefore, it is important to quantify longwall-induced subsurface movements and casing deformations and to develop reliable models to assess the stability of shale gas wells in longwall pillars.

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Wang, Roy, e C. Ross Ethier. "Residual Deformations of Ocular Tissues". In ASME 2013 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/sbc2013-14368.

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Biomechanics and mechanobiology play a potentially significant role in several ocular pathologies. Glaucoma is perhaps the best studied of these, but other ocular conditions where mechanics are important include retinal detachment and macular degeneration (1, 2). Knowledge of the mechanical properties of the relevant ocular tissues, including their constitutive relationships, is required to understand the biomechanical basis of pathology and also for developing biomechanically mediated therapies. Towards this end, it is necessary to understand the residual strain state of relevant ocular tissues prior to formulating accurate and predictive mechanical models (3).

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Šulc, P., L. Pešek, V. Bula e P. Šnábl. "Dynamic tensile experiments of hard rubber on Instron test machine under finite deformations". In Engineering Mechanics 2023. Institute of Thermomechanics of the Czech Academy of Sciences, Prague, 2023. http://dx.doi.org/10.21495/em2023-255.

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Su, Daniel W., e Peter Zhang. "Longwall-Induced Deformations and Shale Gas Well Casing Stresses: Engineering Principles". In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0037.

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ABSTRACT This paper summarizes important findings from the ongoing National Institute for Occupational Safety and Health (NIOSH) gas well stability research. Over the past seven years, field instrumentation results from NIOSH case studies and active mine-by case studies indicate that, under shallower covers, the measured horizontal displacements within the longwall abutment pillar are one order of magnitude higher than those measured under deep cover. Longwall-induced horizontal displacements occur along weak-to-strong rock interfaces; the sharper the bending stiffness contrast across the interfaces, the larger the longwall-induced horizontal displacements. Longwall-induced vertical compressions under shallower covers are, on the other hand, one order of magnitude lower than those under deep covers. Subsurface strata dip may magnify or reduce longwall-induced horizontal displacements. Uncemented production casings serve to uncouple longwall-induced deformations and stresses from the production casing. A case study is presented to illustrate the importance of leaving the production casing uncemented. INTRODUCTION Since 2003, over 1,800 unconventional shale gas wells have been drilled through active and future Pittsburgh Seam coal reserves in Pennsylvania, West Virginia, and Ohio. These unconventional gas wells, whether tapped into the Marcellus or Utica formations, contain very high gas pressure and volume. Strata deformations associated with underground longwall coal mining could induce stresses and deformations in the shale gas well casings, which in certain situations could compromise the mechanical integrity of the production, intermediate, and coal protection casings. Damaged well casings could potentially introduce high-pressure, high-volume explosive gas into underground mine workings to jeopardize underground miners’ safety and health. To provide critical scientific data to the stakeholders, which includes the Mine Safety and Health Administration (MSHA), the Pennsylvania Department of Environmental Protection (PADEP), the West Virginia Department of Mine Safety (WVDMS), the Ohio Department of Natural Resources (OHDNR), coal operators, and gas operators, NIOSH initiated a research program in 2016 to evaluate the effects of longwall-induced deformations on shale gas well casing stability under deep as well as shallow covers. The effects of longwall-induced subsurface deformations on shale gas well casing stability under deep cover, under medium cover, and under shallow cover were published previously (Su et al., 2018a and 2018b; Su et al., 2019a and 2019b; Su et al., 2020; Zhang et al., 2020; Su and Zhang, 2021; Su et al., 2021). This paper focuses on a case study that illustrates the importance of leaving the production casing uncemented.

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"TESTING OF HPD MODEL OF DISSIPATED ENERGY OF HARD RUBBERS AT TORSIONAL FINITE DEFORMATIONS AND TEMPERATURES". In Engineering Mechanics 2019. Institute of Thermomechanics of the Czech Academy of Sciences, Prague, 2019. http://dx.doi.org/10.21495/71-0-367.

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Manzhirov, Alexander V. "Mechanics of Growing Solids: New Track in Mechanical Engineering". In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36712.

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A vast majority of objects around us arise from some growth processes. Many natural phenomena such as growth of biological tissues, glaciers, blocks of sedimentary and volcanic rocks, and space objects may serve as examples. Similar processes determine specific features of many industrial processes which include crystal growth, laser deposition, melt solidification, electrolytic formation, pyrolytic deposition, polymerization and concreting technologies. Recent researches indicates that growing solids exhibit properties dramatically different from those of conventional solids, and the classical solid mechanics cannot be used to model their behavior. The old approaches should be replaced by new ideas and methods of modern mechanics, mathematics, physics, and engineering sciences. Thus, there is a new track in solid mechanic that deals with the construction of adequate models for solid growth processes. The fundamentals of the mathematical theory of growing solids are under consideration. We focus on the surface growth when deposition of a new material occurs at the boundary of a growing solid. Two approaches are discussed. The first one deals with the direct formulation of the mathematical theory of continuous growth in the case of small deformations. The second one is designed for the solution of nonlinear problems in the case of finite deformations. It is based on the ideas of the theory of inhomogeneous solids and regards continuous growth as the limit case of discrete growth. The constitutive equations and boundary conditions for growing solids are presented. Non-classical boundary value problems are formulated. Methods for solving these problems are proposed.

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Vyrovoy, Valeriy, Vladimir Sukhanov e Svetlana Sukhanova. "Interaction of deformations and the structure of composites". In IX INTERNATIONAL CONFERENCE ON ACTUAL PROBLEMS OF ENGINEERING MECHANICS (APEM2022). AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0168084.

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Rapporti di organizzazioni sul tema "Deformations (Mechanics)"

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Zhang, Xinghang. Deformation mechanisms of nanotwinned Al. Office of Scientific and Technical Information (OSTI), novembre 2016. http://dx.doi.org/10.2172/1331877.

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El-Azab, Anter. STATISTICAL MECHANICS MODELING OF MESOSCALE DEFORMATION IN METALS. Office of Scientific and Technical Information (OSTI), aprile 2013. http://dx.doi.org/10.2172/1073049.

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Brongers. PR-186-063516-R01 Stress Corrosion Cracking in Areas of Local Deformation. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), agosto 2009. http://dx.doi.org/10.55274/r0010299.

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Local areas of deformation (wrinkles and dents) have been recognized as one of the leading causes of failures in both gas and liquid pipelines.This research had four objectives: (1) update the industry survey of GRI Project 8756 on SCC at deformations, (2) demonstrate that a crack mouth monitoring technique can be used on full-scale pipe samples with dents to study the mechanical component of near-neutral-pH stress corrosion growth, (3) evaluate the effect of dents on the SCC crack growth rate (CGR), as compared with pipe base metal, and (4) investigate whether hydrotesting can be used as an effective means of mitigation of SCC at dents, i.e., slow down the CGR.

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McNaney, J., B. Torralva, J. Harper, J. Nguyen, D. Orlikowski, V. Raevsky, M. Meyers et al. Strain Rate Scaling of Deformation Mechanisms. Office of Scientific and Technical Information (OSTI), febbraio 2006. http://dx.doi.org/10.2172/1987606.

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Real Fernández, Elena. ¿PUEDE HABER 5 FASES DE DEFORMACIÓN HERCÍNICA EN LA ZONA DE VALDEMORILLO (MADRID)? Ilustre Colegio Oficial de Geólogos, ottobre 2020. http://dx.doi.org/10.21028/erf.2020.10.27.

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This work aims to understand the processes that have taken part in the deformation, both on a small and large scale, of metamorphic materials in Valdemorillo area, located in the west of the Community of Madrid and within the Spanish Central System. The objective is to understand the kinematic evolution and the specific mechanical behaviour of igneous-metamorphic materials from the area, deformed by certain efforts developed throughout the Hercynian Orogeny. Therefore, a structural analysis has been carried out throughout a geological mapping scaled 1: 25000 and the analysis of various petrographic studies by microscope. Thus, a total of 5 different deformations have been identified, which have allowed us to better understand the reconstruction of the processes generated in these materials and that we see today.

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Hirshfeld, Allen. Deformation Quantization in Quantum Mechanics and Quantum Field Theory. GIQ, 2012. http://dx.doi.org/10.7546/giq-4-2003-11-41.

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Tresa M. Pollock. Ruthenium Aluminides: Deformation Mechanisms and Substructure Development. Office of Scientific and Technical Information (OSTI), maggio 2005. http://dx.doi.org/10.2172/877368.

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Horgan, Cornelius O. Large Deformation Failure Mechanisms in Nonlinear Solids. Fort Belvoir, VA: Defense Technical Information Center, gennaio 1995. http://dx.doi.org/10.21236/ada293010.

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Sangid, Michael D., e Ajey Venkataraman. Deformation Mechanisms at Grain Boundaries in Polycrystals. Office of Scientific and Technical Information (OSTI), settembre 2019. http://dx.doi.org/10.2172/1566034.

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Daly, Samantha, Marissa Linne, Michael Sangid e Ajey Venkataraman. Deformation Mechanisms at Grain Boundaries in Polycrystals. Office of Scientific and Technical Information (OSTI), dicembre 2019. http://dx.doi.org/10.2172/1577947.

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