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Journal articles on the topic 'Orthotrope'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Seiler, Josef. "Orthotrope Platten im Stahlbrückenbau." Bautechnik 91, no. 2 (2014): 145–56. http://dx.doi.org/10.1002/bate.201410001.

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2

Unterweger, Harald, Friedrich Novak, and Andreas Orgis. "Aufbereitete Schadensäquivalenzfaktoren für Ermüdungsnachweise von orthotropen Fahrbahnplatten stählerner Straßenbrücken/Damage equivalence factors for the fatigue verification of orthotropic steel decks of highway bridges." Bauingenieur 92, no. 10 (2017): 416–26. http://dx.doi.org/10.37544/0005-6650-2017-10-52.

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Für den Ermüdungsnachweis und die Bestimmung der Restlebensdauer bei stählernen Straßenbrücken nach Eurocode kann anstatt eines komplexen Lastmodells mit mehreren Fahrzeugtypen ein vereinfachtes Lastmodell, das nur aus einem Einzelfahrzeug besteht (ELM3), angewendet werden. Die tatsächliche komplexe Betriebsbeanspruchung wird dann durch sogenannte Schadensäquivalenzfaktoren l erfasst, die jedoch im Eurocode auf Stützweiten sowie Einflusslinienlängen L > 10 m beschränkt sind. &nbsp; In diesem Beitrag werden nun neue Schadensäquivalenzfaktoren l für die maßgebenden Detailpunkte von orthot

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3

Wolchuk, Roman. "Orthotrope Fahrbahnplatte – Entwicklungen und Möglichkeiten für die Zukunft." Stahlbau 76, no. 7 (2007): 478–94. http://dx.doi.org/10.1002/stab.200710052.

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4

Ackermann, G. "Die drillweiche, orthotrope, elastische Platte als Berechnungsmodell für zweiachsig gespannte Filigrandecken." Beton- und Stahlbetonbau 90, no. 3 (1995): 57–63. http://dx.doi.org/10.1002/best.199500090.

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5

Kucuksucu, Aysegul, Mehmet A. Guler, and Ahmet Avci. "Closed-Form Solution of the Frictional Sliding Contact Problem for an Orthotropic Elastic Half-Plane Indented by a Wedge-Shaped Punch." Key Engineering Materials 618 (July 2014): 203–25. http://dx.doi.org/10.4028/www.scientific.net/kem.618.203.

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In this paper, the frictional contact problem of a homogeneous orthotropic material in contact with a wedge-shaped punch is considered. Materials can behave anisotropically depending on the nature of the processing techniques; hence it is necessary to develop an efficient method to solve the contact problems for orthotropic materials. The aim of this work is to develop a solution method for the contact mechanics problems arising from a rigid wedge-shaped punch sliding over a homogeneous orthotropic half-plane. In the formulation of the plane contact problem, it is assumed that the principal ax

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6

Merzouki, Tarek, Fodil Meraghni, Hocine Chalal, and Tarak Ben Zineb. "Comparaison de configurations d'essais hétérogènes en vue d'améliorer l'identification du comportement élastique orthotrope par l'erreur en relation de comportement." Mécanique & Industries 10, no. 5 (2009): 351–64. http://dx.doi.org/10.1051/meca/2009069.

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7

Bakhshandeh, K., and I. Rajabi. "Orthotropy and geometry effects on stress concentration factors for short rectangular plates with a centred circular opening." Journal of Strain Analysis for Engineering Design 42, no. 7 (2007): 551–55. http://dx.doi.org/10.1243/03093247jsa306.

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In this study, the effects of orthotropy ratio and plate length on the stress concentration factor for orthotropic plates with a centred circular opening under the action of uniaxial tension loads are investigated by use of the finite element method. This work demonstrates that the stress concentration factor depends on the length of the member in addition to other established geometric parameters. The value of the transition length between long and short plates is computed and reported as well. This study has shown that Tan's equation for a finite width orthotropic plate is accurate for a rat

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8

Wilson, J. F., and G. Orgill. "Linear Analysis of Uniformly Stressed, Orthotropic Cylindrical Shells." Journal of Applied Mechanics 53, no. 2 (1986): 249–56. http://dx.doi.org/10.1115/1.3171748.

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Within the framework of classical elasticity, the nonbuckled deformations are calculated for orthotropic, right circular, thin-walled cylinders under uniform load conditions. The principle direction of orthotropy follows parallel constant angle helices. Nondimensional system parameters involving four material constants and three loading conditions (internal pressure, longitudinal load, and pure torque) are identified. Through parametric studies deformation patterns are calculated that are unique to orthotropy. Numerical examples illustrate that the proper selection of cylinder orthotropy can l

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9

Cowin, S. C. "Torsion of Cylinders With Shape Intrinsic Orthotropy." Journal of Applied Mechanics 54, no. 4 (1987): 778–82. http://dx.doi.org/10.1115/1.3173116.

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Shape intrinsic orthotropy may be thought of as the type of elastic material symmetry possessed by the wood tissue of a tree. Each year’s new growth rings form a laminate around a central core. The axes of material symmetry lie in the directions tangent and normal to the growth rings or laminates and along the axis of the cylinder. Let Gtz denote the linear elastic orthotropic shear modulus associated with the axial and tangential directions, the tangent plane of a laminate. It is shown here that, for a certain class of elastic cylinders with shape intrinsic orthotropy, the solution to the tor

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10

Abdullaev, Zafar, Sayibdjan Mirzaev, and Sobir Mavlanov. "Nonlinear Deformation of Flexible Orthotropic Shells of Variable Thickness in an Unsteady Magnetic Field." E3S Web of Conferences 97 (2019): 02015. http://dx.doi.org/10.1051/e3sconf/20199702015.

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The analysis of the stress state of a flexible orthotropic shell under the influence of a time-varying mechanical force and a time-varying external electric current is performed, taking into account the mechanical and electromagnetic orthotropy. The effect of thickness on the stress-strain state of the orthotropic shell is investigated. The results obtained indicate the influence of thickness on the deformation of the shell and the need to take this factor into account in the design schemes.

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11

Hlavata, Vera, Pavel Kuklík, and Jan Vanerek. "Validation of Orthotropic Parameters of Timber by Means of Elastic Layer Theory." Key Engineering Materials 776 (August 2018): 29–34. http://dx.doi.org/10.4028/www.scientific.net/kem.776.29.

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The known solution of isotropic elastic layer was modified for orthotropic elastic material behavior in this contribution. The solution was original derived for calculation of footing settlement. However it should be useful for estimation of orthotropic material parameters. Timber is classical orthotropic material. Timber board which is placed on the rigid basement it could be considered as the elastic layer. From the known load displacement curve we can, vice versa, estimate the material parameters. The present solution should be able to control loading by rigid strip footing acting perpendic

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12

Ding, Xi, Sheng-Hui Liao, Xing-Hao Zhu, and Hui-Ming Wang. "Influence of Orthotropy on Biomechanics of Peri-Implant Bone in Complete Mandible Model with Full Dentition." BioMed Research International 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/709398.

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Objective.The study was to investigate the impact of orthotropic material on the biomechanics of dental implant, based on a detailed mandible with high geometric and mechanical similarity.Materials and Methods.Multiple data sources were used to elaborate detailed biological structures and implant CAD models. In addition, an extended orthotropic material assignment methodology based on harmonic fields was used to handle the alveolar ridge region to generate compatible orthotropic fields. The influence of orthotropic material was compared with the commonly used isotropic model and simplified ort

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13

Semenov, Alexey A. "METHODOLOGY RESEARCH OF STABILITY OF SHALLOW ORTHOTROPIC SHELLS OF DOUBLE CURVATURE UNDER DYNAMIC LOADING." International Journal for Computational Civil and Structural Engineering 13, no. 2 (2017): 145–53. http://dx.doi.org/10.22337/2587-9618-2017-13-2-145-153.

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The paper deals with shallow orthotropic shells of double curvature, square in plan, under dynamic loading. Outlines the ratios of the mathematical model of deformation considering the geometric nonlinearity, transverse shear and orthotropy material. For the formation of the ODE system is used method of Kantorovich. The resulting system is solved by the method of Rosenbrock. It is shown the verification of the proposed method for isotropic shells. For several options orthotropic shells made of fiberglass and carbon fiber studied their stability and obtained values of critical loads.

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14

Kumar, A., Shyam K. Samanta, and K. Mallick. "Study of the Effect of Deformation on the Axes of Anisotropy." Journal of Engineering Materials and Technology 113, no. 2 (1991): 187–91. http://dx.doi.org/10.1115/1.2903390.

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Many metal forming operations, such as rolling and tube drawing, are known to induce orthotropic anisotropy. The change of axes of orthotropy with subsequent deformation has been studied in this paper. The change in the orthotropy directions is of great importance for understanding and interpreting the subsequent yield behavior of metals. Based on Hill’s hypothesis that the orthotropy axes coincides with the principal directions of stretch, the change in orthotropy directions has been studied theoretically and experimentally. Since the grain shape and its direction of elongation is a good indi

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15

Phylactopoulos, A., and G. G. Adams. "Transverse Vibration of a Rectangularly Orthotropic Spinning Disk, Part 1: Formulation and Free Vibration." Journal of Vibration and Acoustics 121, no. 3 (1999): 273–79. http://dx.doi.org/10.1115/1.2893976.

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The transverse vibration of a spinning circular disk with rectangular orthotropy is investigated. Two dimensionless parameters are established in order to characterize the degree of disk anisotropy and solutions are sought for a range of these parameters. The orthotropic bending stiffness is transferred into polar coordinates and is found to differ from a classical formulation for a stationary disk. A Fourier series expansion is used in the circumferential direction. Unlike the isotropic disk, the Fourier components determining the transverse vibration modes of the orthotropic disk do not sepa

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16

SOFIYEV, A. H., E. SCHNACK, V. C. HACIYEV, and N. KURUOGLU. "EFFECT OF THE TWO-PARAMETER ELASTIC FOUNDATION ON THE CRITICAL PARAMETERS OF NONHOMOGENEOUS ORTHOTROPIC SHELLS." International Journal of Structural Stability and Dynamics 12, no. 05 (2012): 1250041. http://dx.doi.org/10.1142/s0219455412500411.

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A theoretical analysis is presented for determining the free vibrational and buckling characteristics of the nonhomogeneous, orthotropic, thin-walled, circular cylindrical and conical shells under a hydrostatic pressure and resting on a two-parameter elastic foundation. The basic relations have been obtained for the orthotropic truncated conical shell, the Young's moduli and density of which vary continuously in the thickness direction. By applying the Galerkin method, the buckling hydrostatic pressure and dimensionless frequency parameter of the homogeneous and nonhomogeneous orthotropic trun

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17

Singh, Baljeet, Ritu Sindhu, and Jagdish Singh. "Rayleigh Waves in a Rotating Orthotropic Micropolar Elastic Solid Half-Space." International Journal of Geophysics 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/690249.

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A problem on Rayleigh wave in a rotating half-space of an orthotropic micropolar material is considered. The governing equations are solved for surface wave solutions in the half space of the material. These solutions satisfy the boundary conditions at free surface of the half-space to obtain the frequency equation of the Rayleigh wave. For numerical purpose, the frequency equation is approximated. The nondimensional speed of Rayleigh wave is computed and shown graphically versus nondimensional frequency and rotation-frequency ratio for both orthotropic micropolar elastic and isotropic micropo

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18

Tranvan, H., F. Bardat, M. Jacques, and Y. Arnaud. "Rajeunissement chez le Sequoia sempervirens: effets du microgreffage in vitro." Canadian Journal of Botany 69, no. 8 (1991): 1772–79. http://dx.doi.org/10.1139/b91-225.

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In vitro micrografting of Sequoia sempervirens was used as a rejuvenation method: apices were collected from in vitro cultured shoots issued from a 500-year-old tree; the rootstocks originated from a 1-year-old tree. Only a few grafted apices survived. Once producing leafy shoots, they exhibited some juvenile morphological and physiological characteristics. Some scions were isolated and rooted in a new medium. Although the restoration of the orthotropy is very difficult, a few of the rooted plantlets were orthotropic and this characteristic was maintained after acclimatization in greenhouses.

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19

Agwa, Mohamed A., and António Pinto Da Costa. "Using symbolic computation in the characterization of frictional instabilities involving orthotropic materials." International Journal of Applied Mathematics and Computer Science 25, no. 2 (2015): 259–67. http://dx.doi.org/10.1515/amcs-2015-0020.

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Abstract The present work addresses the problem of determining under what conditions the impending slip state or the steady sliding of a linear elastic orthotropic layer or half space with respect to a rigid flat obstacle is dynamically unstable. In other words, we search the conditions for the occurrence of smooth exponentially growing dynamic solutions with perturbed initial conditions arbitrarily close to the steady sliding state, taking the system away from the equilibrium state or the steady sliding state. Previously authors have shown that a linear elastic isotropic half space compressed

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20

Arslan, Onur. "Computational contact mechanics analysis of laterally graded orthotropic half-planes." World Journal of Engineering 14, no. 2 (2017): 145–54. http://dx.doi.org/10.1108/wje-08-2016-0045.

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Purpose Frictional sliding contact problems between laterally graded orthotropic half-planes and a flat rigid stamp are investigated. The presented study aims at guiding engineering applications in the prediction of the contact response of orthotropic laterally graded members. Design/methodology/approach The solution procedure is based on a finite element (FE) approach which is conducted with an efficient FE analysis software ANSYS. The spatial gradations of the orthotropic stiffness constants through the horizontal axis are enabled utilizing the homogeneous FE approach. The Augmented Lagrangi

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21

Amir, S. "Orthotropic patterns of visco-Pasternak foundation in nonlocal vibration of orthotropic graphene sheet under thermo-magnetic fields based on new first-order shear deformation theory." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, no. 2 (2016): 197–208. http://dx.doi.org/10.1177/1464420716670929.

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In the present research, vibration and instability of orthotropic graphene sheet subjected to thermo-magnetic fields are investigated. Orthotropic visco-Pasternak foundation is considered to analyze the influences of orthotropy angle, damping coefficient, normal and shear modulus. New first-order shear deformation theory is utilized due to accuracy of its polynomial functions compared to other theories of plate. Motion equations are obtained by means of Hamilton’s principle and then solved analytically. Influences of various parameters such as small scale, magnetic field, orthotropic viscoelas

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22

Ari-Gur, J., and M. J. Kenig. "Unified Iso-Response Curves for Orthotropic Plates Under Lateral Pressure Pulse." Journal of Energy Resources Technology 111, no. 4 (1989): 246–49. http://dx.doi.org/10.1115/1.3231431.

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General nondimensional iso-deflection and iso-bending moment curves for the elastic response of orthotropic rectangular plates under lateral pressure pulse are presented. Similarities of loads and plate properties are employed to develop the curves, which represent the peak response for various combinations of orthotropy, density, geometry and loading. The presented curves are valid within the elastic small deflection theory of plates, and their usefulness and limitations are discussed in the paper.

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23

Kawamura, Koji, and Hiroshi Takeda. "Rules of crown development in the clonal shrub Vaccinium hirtum in a low-light understory: a quantitative analysis of architecture." Canadian Journal of Botany 82, no. 3 (2004): 329–39. http://dx.doi.org/10.1139/b04-001.

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The rules of crown development in the clonal shrub Vaccinium hirtum Thunb. in a low-light understory were identified by architectural analysis, and the structure and dynamics of current-year shoots were quantified. Development started from an initial orthotropic axis, which forked into plagiotropic axes; consequently, arched stems were formed. Subsequently, a new orthotropic shoot arose from the dormant meristem on the stem. The process from orthotrophy to plagiotrophy was then repeated. Ramets developed vertically as a result of the repeated formation of such orthotropic shoots and reached a

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24

Moldenhauer, Herbert. "Beanspruchungsgerechte Faserplatzierung in Faser-Kunststoff-Verbunden/Stressoptimized Fiber Placement in Fiber-reinforced Composites." Konstruktion 69, no. 06 (2017): 68–74. http://dx.doi.org/10.37544/0720-5953-2017-06-68.

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Inhalt: Eine Faserplatzierung in Richtung der Hauptspannungen in Faser-Kunststoff-Verbunden (FKV) schöpft die überragenden longitudinalen Steifigkeits- und Festigkeitswerte der Fasern voll aus. Für diese Methodik hat sich die Bezeichnung CAIO (Computer aided internal Optimization) etabliert. Die zu lösende Aufgabe besteht in der Berechnung von Hauptspannungslinien aus Hauptspannungsrichtungen, allgemeiner ausgedrückt: in der Integration von Richtungsfeldern. In dieser Arbeit wird gezeigt, dass dies für ebene Strukturen sowie für 3D-Schalen über die Simulation orthotroper Wärmeleitung mit hoher

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Guo, Li Fang, Xing Li, and You Zheng Yang. "Mode I Crack Problem for a Functionally Graded Orthotropic COATING-Substrate Structure." Advanced Materials Research 936 (June 2014): 1999–2006. http://dx.doi.org/10.4028/www.scientific.net/amr.936.1999.

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In this paper, the Fourier integral transform-singular integral equation method is presented for the Mode I crack problem of the functionally graded orthotropic coating-substrate structure. The elastic property of the material is assumed vary continuously along the thickness direction. The principal directions of orthotropy are parallel and perpendicular to the boundaries of the strip. Numerical examples are presented to illustrate the effects of the crack length, the material nonhomogeneity and the thickness of coating on the stress intensity factors.

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Pagani, Claudio, Milan Jirásek, and Martin Horák. "LOCALIZATION ANALYSIS OF AN ORTHOTROPIC MULTI-SURFACE PLASTICITY MODEL UNDER UNIAXIAL STRESS." Acta Polytechnica CTU Proceedings 26 (March 17, 2020): 56–63. http://dx.doi.org/10.14311/app.2020.26.0056.

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Numerical simulations of masonry structures are often based on continuum macromodelling approaches that need constitutive laws able to phenomenologically reproduce the behavior of the material. To capture the deformation process up to failure, appropriate softening laws are needed to take into account the contraction of the yield stress domain caused by cracking and crushing. It is well known that softening may lead to localization of inelastic strain. This paper focuses on localization analysis of an orthotropic macro-scale model in the framework of multi-surface plasticity, which describes t

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Kourkoulis, S. K. "Quantifying the Plastic Anisotropy for Particulate Metal Matrix Composites." Advanced Composites Letters 11, no. 4 (2002): 096369350201100. http://dx.doi.org/10.1177/096369350201100401.

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The failure of orthotropic materials, traditionally described by Hill's criterion, in terms of the anisotropy ratio r, i.e. the ratio of transverse to through thickness increments of logarithmic strain, is studied in the present work. In spite of the critical role of r for the description of the failure of such materials, its quantification is not yet standardized. Based on results obtained from long series of experiments r is here quantified, for the case of a modern particulate composite material, extensively used in aerospace applications. The variation of r versus the level of the plastic

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Smidova, Eliska, and Petr Kabele. "Constitutive Model for Timber Fracture under Tensile and Shear Loads." Applied Mechanics and Materials 784 (August 2015): 137–44. http://dx.doi.org/10.4028/www.scientific.net/amm.784.137.

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A 2D homogeneous orthotropic constitutive model of tensile and shear fracture in timber based on fixed smeared crack approach has been developed and implemented in ATENA®finite element software. The model captures (1) elastic and inelastic behavior in small deformations range, (2) material orthotropy, both in linear and non-linear range, (3) cracking across or along fibers, and (4) behavior under unloading/reloading. In this contribution we present model validation through numerical simulations of compact tension shear (CTS) tests of Radiata Pine timber.

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29

Nicolini, Eric. "Nouvelles observations sur la morphologie des unités de croissance du hêtre (Fagus sylvatica L.). Symétrie des pousses, reflet de la vigueur des arbres." Canadian Journal of Botany 78, no. 1 (2000): 77–87. http://dx.doi.org/10.1139/b99-162.

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Le hêtre a une croissance rythmique où chaque pousse annuelle est constituée d'une unité de croissance (u.c.) printanière parfois suivie, quelques semaines plus tard, d'une unité de croissance estivale. L'u.c. printanière présente une disposition foliaire alterne distique, tandis que l'u.c. estivale, selon certains auteurs, a une disposition foliaire alterne spiralée. Au terme d'observations morphologiques et histologiques de bourgeons formés à différentes périodes de l'année, il s'avère que la disposition foliaire du hêtre n'évolue pas d'un type d'u.c. à l'autre : les ébauches foliaires sont

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Narita, Y. "Free Vibration of Polar-Orthotropic Sector Plates Resting on Point Supports." Journal of Vibration and Acoustics 107, no. 3 (1985): 334–38. http://dx.doi.org/10.1115/1.3269265.

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An accurate Ritz solution for the free vibration of point-supported annular sector plates of polar orthotropy is presented. A double power series function is used to represent deflection of the plate, with Lagrange multipliers to impose the constraint conditions. To establish accuracy of the approach, the frequency parameters of a sector plate with some supporting points distributed along the boundary are compared to those of a uniformly simply supported plate. The natural frequencies and mode shapes are presented for wide ranges of the opening angle, radius ratio, and orthotropic parameters.

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BHARDWAJ, N., and A. P. GUPTA. "AXISYMMETRIC VIBRATION OF POLAR ORTHOTROPIC CIRCULAR PLATES OF QUADRATICALLY VARYING THICKNESS RESTING ON ELASTIC FOUNDATION." International Journal of Structural Stability and Dynamics 05, no. 03 (2005): 387–408. http://dx.doi.org/10.1142/s0219455405001647.

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This paper is concerned with the axisymmetric vibration problem of polar orthotropic circular plates of quadratically varying thickness and resting on an elastic foundation. The problem is solved by using the Rayleigh–Ritz method with boundary characteristic orthonormal polynomials for approximating the deflection function. Numerical results are computed for frequencies, nodal radii and mode shapes. Three-dimensional graphs are also plotted for the first four normal modes of axisymmetric vibration of plates with free, simply-supported and clamped edge conditions for various values of taper, or

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Ceccaldi, D., F. Yala-Sedrati, T. Baudin, R. Penelle та F. Royer. "Simulation de la texture de deformation en traction uniaxiale et calcul du coefficient de lankford R(α) de toles d'aciers extra doux—application au cas non orthotrope". Acta Metallurgica et Materialia 40, № 6 (1992): 1177–86. http://dx.doi.org/10.1016/0956-7151(92)90416-c.

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Gräf, Michael, Anja Hausmann, Dominik Kowanz, and Birgit Lorenz. "Hoch dosierte Anderson- und Kestenbaum-Operation bei Nystagmus mit Kopfzwangshaltung." Der Ophthalmologe 117, no. 12 (2020): 1210–17. http://dx.doi.org/10.1007/s00347-020-01086-6.

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Zusammenfassung Hintergrund Die Korrektur einer Kopfzwangshaltung (KZH) bei infantilem Nystagmussyndrom (INS) erfolgt mit der Kestenbaum-Operation (KO) in Form der beidseitigen Rücklagerung der in KZH aktiven Agonisten und Verkürzung ihrer Antagonisten oder mit der Anderson-Operation (AO) durch die alleinige Rücklagerung der Agonisten. Ziel der Arbeit Vergleich der Ergebnisse hoch dosierter AO und KO bei ähnlicher KZH. Patienten und Methoden In unterschiedlichen Zeiträumen (2013 bis 2019 bzw. 2003 bis 2013) kam ausschließlich die AO bzw. die KO zur Anwendung. Eine hoch dosierte AO erhielten in

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Lu, Xing Fu, Qing Dong Zhang, and Xiao Feng Zhang. "Study on the Buckling Deformation of Orthotropic Strip." Advanced Materials Research 572 (October 2012): 181–86. http://dx.doi.org/10.4028/www.scientific.net/amr.572.181.

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Because of the crystal preferential orientation, the rolled strip exhibits orthotropy. The mechanism and deformation behavior of the orthotropic strip buckling (included pre-buckling and post buckling) was studied by analytical and finite element method. Through the energy principle, the mathematical model of critical buckling was established, and the critical conditions were obtained. The generating path of post buckling was found with perturbation variational solution. At the same time, using software ANSYS to simulate the buckling deformation, then the buckling mode, the critical stress and

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Noraliev, Nurilla, Bakhrom Ishniyazov, Bunyod Safarov, and Oybek Saparov. "Stress-strain state of spherical shells with two unequal holes." E3S Web of Conferences 258 (2021): 09085. http://dx.doi.org/10.1051/e3sconf/202125809085.

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This article presents the results of a numerical study of the stress concentration around two equal and unequal holes in an orthotropic spherical shell made of composite materials under the action of internal pressure. The influence of geometric (hole radii, shell thickness, distance between holes) characteristics, as well as material orthotropy and shear stiffness, on the stress state of spherical shells made of composite materials is studied. A numerical algorithm based on the finite element method has been developed and a software package has been implemented on a computer that allows solvi

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Kumar, Rajive, Prashant Bansal, Bader S. Al-Mal, et al. "Seismic data conditioning and orthotropic rock-physics-based inversion of wide-azimuth P-wave seismic data for fracture and total organic carbon characterization in a north Kuwait unconventional reservoir." GEOPHYSICS 83, no. 4 (2018): B229—B240. http://dx.doi.org/10.1190/geo2017-0673.1.

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Optimization of production from unconventional reservoirs requires estimates of reservoir properties such as porosity, total organic carbon (TOC) content, clay content, fluid saturation, and fracture intensity. The porosity and TOC content help to determine reservoir quality, and the natural fracture intensity provides information important for the completion strategy. Because shale reservoirs display intrinsic anisotropy due to layering and the partial alignment of clay minerals and kerogen with the bedding plane, the minimum acceptable representation of the anisotropy of naturally fractured

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Zarandi, Somayeh, Hsiang-Wei Lai, Yun-Che Wang, and Sergey Aizikovich. "Residual Stress Analysis of an Orthotropic Composite Cylinder under Thermal Loading and Unloading." Symmetry 11, no. 3 (2019): 320. http://dx.doi.org/10.3390/sym11030320.

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Elastoplastic analysis of a composite cylinder, consisting of an isotropic elastic inclusion surrounded by orthotropic matrix, is conducted via numerical parametric studies for examining its residual stress under thermal cycles. The matrix is assumed to be elastically and plastically orthotropic, and all of its material properties are temperature-dependent (TD). The Hill’s anisotropic plasticity material model is adopted. The interface between the inclusion and matrix is perfectly bonded, and the outer boundary of the cylinder is fully constrained. A quasi-static, uniform temperature field is

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Yilmaz, Korhan Babacan, Isa Comez, Mehmet Ali Güler, and Bora Yildirim. "The effect of orthotropic material gradation on the plane sliding frictional contact mechanics problem." Journal of Strain Analysis for Engineering Design 54, no. 4 (2019): 254–75. http://dx.doi.org/10.1177/0309324719859110.

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With the advent of new functional and intelligent non-conventional materials, understanding the behavior of these materials in different contact conditions over the conventional materials is one of the most crucial aspects in early design process for coated systems. Therefore, the sliding contact problem for a functionally graded orthotropic coating–substrate system and a rigid cylindrical punch is considered in this article to study the aforementioned aspects. The functionally graded orthotropic coating is modeled to be bonded to an isotropic substrate of finite thickness and is loaded by a s

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Ramesh, K., A. K. Yadav, and R. Sethuraman. "Influence of the volume fraction of fibre-reinforced orthotropic composite on the mode-I stress intensity factor." Journal of Strain Analysis for Engineering Design 33, no. 3 (1998): 233–41. http://dx.doi.org/10.1243/0309324981512959.

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In the case of infinite bodies involving self-equilibrating loads, stress intensity factors (SIFs) for isotropic and orthotropic materials are the same. However, when the specimen is bounded, material orthotropy does influence the value of SIFs. Delale and Erdogan evaluated the mode-I SIF by solving singular integral equations numerically and showed that the SIF can be greater than the isotropic material value for certain types of orthotropic materials and can be smaller than the isotropic material value for certain other types of materials. They also observed that the mode-I SIF is not altere

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40

Bhardwaj, N., A. P. Gupta, and K. K. Choong. "Asymmetric Vibration of Polar Orthotropic Annular Circular Plates of Quadratically Varying Thickness with Same Boundary Conditions." Shock and Vibration 15, no. 6 (2008): 599–617. http://dx.doi.org/10.1155/2008/858025.

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In the present paper, asymmetric vibration of polar orthotropic annular circular plates of quadratically varying thickness resting on Winkler elastic foundation is studied by using boundary characteristic orthonormal polynomials in Rayleigh-Ritz method. Convergence of the results is tested and comparison is made with results already available in the existing literature. Numerical results for the first ten frequencies for various values of parameters describing width of annular plate, thickness profile, material orthotropy and foundation constant for all three possible combinations of clamped,

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Bendsoe, M. P., J. M. Guedes, R. B. Haber, P. Pedersen, and J. E. Taylor. "An Analytical Model to Predict Optimal Material Properties in the Context of Optimal Structural Design." Journal of Applied Mechanics 61, no. 4 (1994): 930–37. http://dx.doi.org/10.1115/1.2901581.

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This paper deals with the simultaneous optimization of material and structure for minimum compliance. Material properties are represented in the most general form possible for a (locally) linear elastic continuum, namely the unrestricted set of elements of positive semi-definite constitutive tensors and cost measures based on certain invariants of the tensors. Analytical forms are derived for the optimized material properties. These results, which apply in general, indicate that the optimized material is orthotropic with the directions of orthotropy following the directions of principal strain

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Mol'chenko, L. V. "Strain of a flexible orthotropic cylindrical shell as a function of orthotropy parameters." Journal of Soviet Mathematics 60, no. 3 (1992): 1478–82. http://dx.doi.org/10.1007/bf01095744.

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Shindo, Yasuhide, Hiroaki Higaki, and Hideaki Nozaki. "Impact Response of a Single Edge Crack in an Orthotropic Strip." Journal of Applied Mechanics 59, no. 2S (1992): S152—S157. http://dx.doi.org/10.1115/1.2899480.

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The elastodynamic response of a single edge crack in an orthotropic strip under normal impact is considered in this study. The edge crack is oriented in a direction normal to the edge of the strip. Laplace and Fourier transforms are used to reduce the transient problem to the solution of a pair of dual integral equations in the Laplace transform plane. The solution to the dual integral equations is then expressed in terms of a Fredholm integral equation of the second kind. A numerical Laplace inversion routine is used to recover the time dependence of the solution. Numerical values on the dyna

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Sacchi Landriani, G., and M. Rovati. "Optimal Design for Two-Dimensional Structures Made of Composite Materials." Journal of Engineering Materials and Technology 113, no. 1 (1991): 88–92. http://dx.doi.org/10.1115/1.2903386.

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The paper deals with the problem of finding the optimal orientation of orthotropic properties for an elastic body, subjected to a plane state of stress, in order to maximize the stiffness of the body itself. A variational formulation of the problem is presented and the computation of the necessary condition for an optimal solution is carried out. The physical meaning of such a condition is then outlined, and its generality pointed out with reference to the case of two-dimensional flexural systems. Finally, an extension of the plane stress problem is formulated, taking into account as design va

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Thompson, Ian, and I. David Abrahams. "Diffraction of flexural waves by cracks in orthotropic thin elastic plates. I Formal solution." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 461, no. 2063 (2005): 3413–36. http://dx.doi.org/10.1098/rspa.2004.1418.

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The problem of flexural wave diffraction by a semi-infinite crack in an infinite orthotropic thin plate is considered. Such models have application to the ultrasonic non-destructive inspection of thin components, such as aeroplane wings. For simplicity, the plate is modelled using Kirchhoff theory, and the crack is chosen to be aligned along one of the principal directions of material orthotropy. For incident plane waves, an exact analytical expression for the scattered field is derived by means of the Wiener–Hopf technique. In this model problem, the Wiener–Hopf kernel is scalar and its facto

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Mohd Nor, Mohd Khir, Rade Vignjevic, and James Campbell. "Modelling of Shockwave Propagation in Orthotropic Materials." Applied Mechanics and Materials 315 (April 2013): 557–61. http://dx.doi.org/10.4028/www.scientific.net/amm.315.557.

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Modelling of shockwave propagation in orthotropic materials requires an appropriate description of material behaviour within elastic and plastic regimes. To deal with this issues, a finite strain constitutive model for orthotropic materials was developed within a consistent thermodynamic framework of irreversible process in this paper. The important features of this material model are the multiplicative decomposition of the deformation gradient and a Mandel stress tensor combined with the new stress tensor decomposition generalised for orthotropic materials. The elastic free energy function an

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Mallick, K., Shyam K. Samanta, and A. Kumar. "An Experimental Study of the Evolution of Yield Loci for Anisotropic Materials Subjected to Finite Shear Deformation." Journal of Engineering Materials and Technology 113, no. 2 (1991): 192–98. http://dx.doi.org/10.1115/1.2903391.

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This paper presents a set of experimental results concerning the evolution of yield loci for anisotropic materials in the course of finite shear deformation history. Thin walled tubes of SAE 1020 steel are tested under triaxial loading conditions – tension, torsion and internal pressure, at room temperature. The specimens were prepared from cold-drawn tubes which had a prominent fibrous grain structure. They showed considerable amount of in-plane anisotropy and orthotropic yield properties with respect to the longitudinal and circumferential axes. The as-received specimens were further pre-str

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Zysset, P. K., R. W. Goulet, and S. J. Hollister. "A Global Relationship Between Trabecular Bone Morphology and Homogenized Elastic Properties." Journal of Biomechanical Engineering 120, no. 5 (1998): 640–46. http://dx.doi.org/10.1115/1.2834756.

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An alternative concept of the relationship between morphological and elastic properties of trabecular bone is presented and applied to human tissue from several anatomical locations using a digital approach. The three-dimensional morphology of trabecular bone was assessed with a microcomputed tomography system and the method of directed secants as well as the star volume procedure were used to compute mean intercept length (MIL) and average bone length (ABL) of 4 mm cubic specimens. Assuming isotropic elastic properties for the trabecular tissue, the general elastic tensors of the bone specime

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Ahmed, Mousa Khalifa. "How the Thermal Gradient Affects the Vibration Behavior of a Spinning Orthotropic Oval Cylindrical Shell." International Journal of Applied Mechanics 07, no. 04 (2015): 1550056. http://dx.doi.org/10.1142/s1758825115500568.

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Based on the framework of Flügge's shell theory, transfer matrix approach and Romberg integration method, we investigated how the thermal gradient affects the vibration behavior of rotating isotropic and orthotropic oval cylindrical shells. The governing equations of orthotropic oval cylindrical shells, under parabolically varying thermal gradient around its circumference, with consideration of the effects of initial hoop tension and centrifugal forces due to the rotation are derived, and they are put in a matrix differential equation as a boundary-value problem. As a semianalytic solution, th

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Lee, V. G. "The Three-Dimensional Infinite Space and Half-Space Green's Functions for Orthotropic Materials." Journal of Mechanics 31, no. 1 (2014): 21–28. http://dx.doi.org/10.1017/jmech.2014.36.

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ABSTRACTCommon materials, ranging from natural wood to modern composites, have been recognized as ortho-tropic materials. The elastic properties of such materials are governed by nine elastic constants. In this paper the complete set of Green's functions for an infinite medium and a half space is given, which were not reported completely before. Analytic expressions for the infinite Green's functions are derived through the explicit form of the sextic equation given explicitly. For an orthotopic half space, the Green's function is derived by a superposition method. The mathematical concept is

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