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Journal articles on the topic 'Influence of orthotropy'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

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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2

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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3

Zhou, Song, Yi Sun, Boyang Chen, and Tong-Earn Tay. "Material orthotropy effects on progressive damage analysis of open-hole composite laminates under tension." Journal of Reinforced Plastics and Composites 36, no. 20 (2017): 1473–86. http://dx.doi.org/10.1177/0731684417710329.

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The sizes effects on the strengths of open-hole fibre-reinforced composite laminates subjected to tensile loading (OHT) have been investigated widely. However, little attention has been paid to the influence of material orthotropy. This paper presents a progressive damage model for the model failure of notched laminates under tensile loading based on continuum damage mechanics and cohesive elements. The effects of orthotropy on the failure of notched laminates with seven different ply sequences are investigated by our proposed model. The prediction results adopting the Hoffman and Pinho failur

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4

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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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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6

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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7

Patel, Mitesh, Stephen Daynes, and Chun H. Wang. "The Influence of Orthotropy and Taper Angle on the Compressive Strength of Composite Laminates with Scarfed Holes." Advanced Materials Research 891-892 (March 2014): 178–84. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.178.

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The residual strengths of laminated composites containing notches or holes depend on the characteristic dimension of the notches as well as the laminate properties. This paper presents an experimental and computational investigation of the effect of orthotropy as well as scarf notch angles on the compressive strength of composite laminates made of seven different stacking sequences with the number of plies ranging between 20 and 24. Specimens containing scarfed holes of different scarf angles (6° and 10°) and straight holes of two different diameters (3.175mm and 6.35mm) were tested for compar

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8

SILVA, N. FREITAS, and N. SILVESTRE. "ON THE INFLUENCE OF MATERIAL COUPLINGS ON THE LINEAR AND BUCKLING BEHAVIOR OF I-SECTION COMPOSITE COLUMNS." International Journal of Structural Stability and Dynamics 07, no. 02 (2007): 243–72. http://dx.doi.org/10.1142/s0219455407002307.

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This paper presents the incorporation of shear deformation effects into a Generalized Beam Theory (GBT) developed to analyze the structural behavior of composite thin-walled columns made of laminated plates and displaying arbitrary orthotropy. Unlike other existing beam theories, the present GBT formulation incorporates in a unified fashion (i) elastic coupling effects, (ii) warping effects, (iii) cross-section in-plane deformation and (iv) shear deformation. The main concepts and procedures involved in the available GBT are adapted/modified to account for the specific aspects related to the m

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9

Pozorska, Jolanta, and Zbigniew Pozorski. "The influence of the core orthotropy on the wrinkling of sandwich panels." Journal of Applied Mathematics and Computational Mechanics 14, no. 4 (2015): 133–38. http://dx.doi.org/10.17512/jamcm.2015.4.13.

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10

Vorobyev, Alexey, Olivier Arnould, Didier Laux, Roberto Longo, Nico P. van Dijk, and E. Kristofer Gamstedt. "Characterisation of cubic oak specimens from the Vasa ship and recent wood by means of quasi-static loading and resonance ultrasound spectroscopy (RUS)." Holzforschung 70, no. 5 (2016): 457–65. http://dx.doi.org/10.1515/hf-2015-0073.

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Abstract The cylindrical orthotropy, inherent time-dependency response, and variation between and within samples make the stiffness characterisation of wood more challenging than most other structural materials. The purpose of the present study is to compare static loading with resonant ultrasound spectroscopy (RUS) and to investigate how to combine the advantages of each of these two methods to improve the estimation of the full set of elastic parameters of a unique sample. The behavior of wood as an orthotropic mechanical material was quantified by elastic engineering parameters, i.e. Poisso

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11

Grigorenko, A. Ya, S. A. Pankrat’ev, and S. N. Yaremchenko. "Influence of Orthotropy on the Stress–Strain State of Quadrangular Plates of Different Shapes." International Applied Mechanics 55, no. 2 (2019): 199–210. http://dx.doi.org/10.1007/s10778-019-00950-6.

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12

Grigorenko, Ya M., and S. N. Yaremchenko. "Influence of orthotropy on displacements and stresses in nonthin cylindrical shells with elliptic cross section." International Applied Mechanics 43, no. 6 (2007): 654–61. http://dx.doi.org/10.1007/s10778-007-0064-0.

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13

Grigorenko, Ya M., and L. S. Rozhok. "Influence of orthotropy parameters on the stress state of hollow cylinders with elliptic cross-section." International Applied Mechanics 43, no. 12 (2007): 1372–79. http://dx.doi.org/10.1007/s10778-008-0008-3.

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14

Frascio, Mattia, Lorenzo Bergonzi, Michal Jilich, et al. "ADDITIVE MANUFACTURING PROCESS PARAMETER INFLUENCE ON MECHANICAL STRENGTH OF ADHESIVE JOINTS, PRELIMINARY ACTIVITIES." Acta Polytechnica CTU Proceedings 25 (December 6, 2019): 41–47. http://dx.doi.org/10.14311/app.2019.25.0041.

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The work illustrates how building parameters of the Additive Manufacturing process Fused Filament Fabrication can aﬀect not only the mechanical properties but also the surface wettability and morphology. Wettability and morphology are relevant factors in bonded joints performance. Advantages of polymeric additive manufacturing are to allow a re-design of components with locally controlled properties and integrated functions. Major limitations are related to the lack of material testing standardization and constraints due to the build volume and to the object orientation for printability: the l

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15

Grechka, Vladimir, Ivan Vasconcelos, and Mark Kachanov. "The influence of crack shape on the effective elasticity of fractured rocks." GEOPHYSICS 71, no. 5 (2006): D153—D160. http://dx.doi.org/10.1190/1.2240112.

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A circle is the basic fracture shape adopted by conventional effective media theories to describe the overall elasticity of cracked solids. Fractures in rocks do not resemble circles, so it is important to find out to what extent the available theoretical results apply to realistic fracture shapes. To address this issue, we conduct 3D numerical experiments on the so-called digital rocks containing irregular cracks that might be partially closed and might intersect each other. Despite profound deviations of our fracture geometries from circles, we find that basic theoretical results originally

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16

Farag, A. M., and A. S. Ashour. "Free Vibration of Orthotropic Skew Plates." Journal of Vibration and Acoustics 122, no. 3 (1999): 313–17. http://dx.doi.org/10.1115/1.1302085.

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The main purpose of this paper is to develop a fast converging semianalytical method for assessing the vibration effect on thin orthotropic skew (or parallelogram/oblique) plates. Since the geometry of the skew plate is not helpful in the mathematical treatments, the analysis is often performed by more complicated and laborious methods. A successive conjunction of the Kantorovich method and the transition matrix is exploited herein to develop a new modification of the finite strip method to reduce the complexity of the problem. The displacement function is expressed as the product of a basic t

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17

Wang, Y., and R. K. N. D. Rajapakse. "An Exact Stiffness Method for Elastodynamics of a Layered Orthotropic Half-Plane." Journal of Applied Mechanics 61, no. 2 (1994): 339–48. http://dx.doi.org/10.1115/1.2901450.

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A method is presented in this paper to compute displacements and stresses of a multilayered orthotropic elastic half-plane under time-harmonic excitations. The half-plane region under consideration consists of a number of layers with different thicknesses and material properties. Exact layer stiffness matrices describing the relationship between Fourier transforms of displacements and tractions at the upper and bottom surface of each layer are established explicitly by using the analytical general solutions for displacements and stresses of a homogeneous orthotropic elastic medium. The global

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18

Witczak, Pawel Zygmunt, and Michal Swiatkowski. "Magnetic forces applied to the tank walls of a large power transformer." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 35, no. 6 (2016): 2087–94. http://dx.doi.org/10.1108/compel-03-2016-0094.

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Purpose The purpose of this paper is to calculate forces created by the magnetic leakage field, which are directly applied to tank walls via magnetic shield. Design/methodology/approach Electromagnetic and mechanical calculations use 3D finite element technology, both applied to materials having constant orthotropic properties. The magnetic solver uses harmonic excitation; the analysis of mechanical deflection is carried out in static conditions. Two types of forces are considered: magnetostatic surface forces and magnetostriction volumetric ones. In measurements, the laser scanning vibrometer

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19

Pervez, Tasneem, F. K. S. Al-Jahwari, and Abdennour Seibi. "Vibration Analysis of Thick Arbitrarily Laminated Plates of Various Shapes and Edge Conditions." Key Engineering Materials 471-472 (February 2011): 1177–83. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.1177.

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Free vibration analysis of arbitrarily laminated plates of quad, penta and hexagonal shapes, which have combinations of clamped, simply supported and free edge conditions is performed. The finite element formulation is based on first and higher order shear deformation theories to study the free vibration response of thick laminated composite plates. A finite element code is developed incorporating shear deformation theories using an 8-noded serendipity element. The effect of plate shape, arbitrary lamination and different edge conditions on natural frequencies and mode shapes are investigated.

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20

MIELKE, ALEXANDER, and EDUARD ROHAN. "HOMOGENIZATION OF ELASTIC WAVES IN FLUID-SATURATED POROUS MEDIA USING THE BIOT MODEL." Mathematical Models and Methods in Applied Sciences 23, no. 05 (2013): 873–916. http://dx.doi.org/10.1142/s0218202512500637.

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We consider periodically heterogeneous fluid-saturated poroelastic media described by the Biot model with inertia effects. The weak and semistrong formulations for displacement, seepage and pressure fields involve three equations expressing the momentum and mass balance and the Darcy law. Using the two-scale homogenization method, we obtain the limit two-scale problem and prove the existence and uniqueness of its weak solutions. The Laplace transformation in time is used to decouple the macroscopic and microscopic scales. It is shown that the seepage velocity is eliminated from the macroscopic

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21

Barros, P. D., D. M. Neto, J. L. Alves, M. C. Oliveira, and L. F. Menezes. "Study on the influence of orthotropy and tension–compression asymmetry of metal sheets in springback and formability predictions." Journal of Physics: Conference Series 1063 (July 2018): 012053. http://dx.doi.org/10.1088/1742-6596/1063/1/012053.

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22

Klusák, Jan, Tomáš Profant, Zdeněk Knésl, and Michal Kotoul. "The influence of discontinuity and orthotropy of fracture toughness on conditions of fracture initiation in singular stress concentrators." Engineering Fracture Mechanics 110 (September 2013): 438–47. http://dx.doi.org/10.1016/j.engfracmech.2013.05.002.

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23

Grigorenko, Ya М., and L. S. Rozhok. "Influence of the Variations of Orthotropy Parameters on the Stress State of Hollow Cylinders with Concave Corrugated Cross Sections." Journal of Mathematical Sciences 229, no. 3 (2018): 269–79. http://dx.doi.org/10.1007/s10958-018-3676-5.

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24

Maksimyuk, V. A., and I. S. Chernyshenko. "Influence of a physical nonlinearity and orthotropy of the materials on the stress distribution around holes in spherical shells." Soviet Applied Mechanics 22, no. 10 (1986): 913–16. http://dx.doi.org/10.1007/bf01273667.

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25

MOFFATT, H. K., and A. SELLIER. "Migration of an insulating particle under the action of uniform ambient electric and magnetic fields. Part 1. General theory." Journal of Fluid Mechanics 464 (August 10, 2002): 279–86. http://dx.doi.org/10.1017/s0022112002001131.

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The behaviour of an insulating particle suspended in a liquid metal and subject to the influence of locally uniform electric and magnetic fields (E, B) is considered. The electric field drives a current J which is perturbed by the presence of the particle, and the resulting Lorentz force drives a flow. It is assumed that both the Reynolds number and the Hartmann number based on particle size are small. If the particle is fixed, it experiences a force and couple that are each bilinear in J and B; if it is freely suspended, then it moves with translational velocity U and angular velocity Ω each

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26

Gennaro, V. De, J. Canou, J. C. Dupla, and N. Benahmed. "Influence of loading path on the undrained behaviour of a medium loose sand." Canadian Geotechnical Journal 41, no. 1 (2004): 166–80. http://dx.doi.org/10.1139/t03-082.

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The results of an experimental programme aimed at studying the undrained behaviour of Hostun sand are presented in this paper. Specific conditions concerning the initial relative density (medium loose arrangements) and the loading paths (compression and extension under monotonic and cyclic loadings) were considered in the test programme. Monotonic tests carried out in both drained and undrained conditions show a significant difference in behaviour between compression and extension. It is observed that, in undrained conditions, Hostun sand is weaker in extension than in compression. In compress

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27

Radaelli, Giuseppe, and Just L. Herder. "Study on the large-displacement behaviour of a spiral spring with variations of cross-section, orthotropy and prestress." Mechanical Sciences 9, no. 2 (2018): 337–48. http://dx.doi.org/10.5194/ms-9-337-2018.

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Abstract. This work is dedicated to the study of the large-displacement behaviour of a spiral spring. Parameters that influence the local torsion stiffness of the beam that constitutes the spiral are varied and their effect is studied. Cross-sectional shape, orthotropic material orientation and prestress are the three classes of parameters that are varied. The effect that the local change in torsional stiffness has on the overall behaviour is illustrated in a linearised way by comparing in-plane and out-of-plane stiffnesses, and nonlinearly, by inspecting a graphical representation of the pote

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28

Vukasović, Marko, Radoslav Pavazza, and Frane Vlak. "An analytic solution for bending of thin-walled laminated composite beams of symmetrical open sections with influence of shear." Journal of Strain Analysis for Engineering Design 52, no. 3 (2017): 190–203. http://dx.doi.org/10.1177/0309324717697524.

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An approximate analytic solution for bending of thin-walled laminated composite beams of symmetrical open sections with influence of shear is presented. Symmetrically laminated beams that possess membrane orthotropy are considered. The classical Euler–Bernoulli’s and Timoshenko’s bending beam theories are augmented by terms which take into account the shear strain in beam mid-surface as well as the warping of the cross section due to shear. Consequently, the beam is subjected to bending with the influence of shear caused by transverse forces acting in the plane of symmetry and in addition to t

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29

Erisov, Yaroslav, Sergei Surudin, Sergei Alexandrov, and Lihui Lang. "Influence of the Replacement of the Actual Plastic Orthotropy with Various Approximations of Normal Anisotropy on Residual Stresses and Strains in a Thin Disk Subjected to External Pressure." Symmetry 12, no. 11 (2020): 1834. http://dx.doi.org/10.3390/sym12111834.

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Plastic anisotropy is very common to metallic materials. This property may significantly affect the performance of structures. However, the actual orthotropic yield criterion is often replaced with a criterion based on the assumption of normal anisotropy. The present paper aims to reveal the influence of this replacement on the distribution of strains and residual strains in a thin hollow disk under plane stress conditions. The boundary-value problem is intentionally formulated such that it is possible to obtain an exact semi-analytical solution without relaxing the boundary conditions. It is

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30

Grechka, Vladimir. "Multiple cracks in VTI rocks: Effective properties and fracture characterization." GEOPHYSICS 72, no. 5 (2007): D81—D91. http://dx.doi.org/10.1190/1.2751500.

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The existing fracture-characterization techniques are based on assuming the unfractured host rock either to be isotropic or the magnitudes of both the background and crack-induced anisotropies to be small. I relax both assumptions and examine the effective media caused by fractures with realistic (not small) crack densities in a strongly anisotropic, primarily transversely isotropic (TI) host rock. The analysis of penny-shaped cracks in the noninteraction approximation (NIA) reveals the dependence of their excess fracture compliance tensors on the orientation of the background symmetry axis. A

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31

Ragauskas, Paulius, and Rimantas Belevičius. "IDENTIFICATION OF MATERIAL PROPERTIES OF COMPOSITE MATERIALS." Aviation 13, no. 4 (2009): 109–15. http://dx.doi.org/10.3846/1648-7788.2009.13.109-115.

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Present paper describes the facilities of composite material properties identification technique using specimen vibration tests, genetic algorithms, finite elements analysis and specimen shape optimization. In identification process the elastic constants in a numerical model is updated so that the output from the numerical code fits the results from vibration testing. Main problem analysed in this paper is that Poisson's ratio is the worst determined elastic characteristic due to its low influence on specimen eigenfrequencies. It is shown that it is possible to increase its influence by choosi

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32

Vodiannikov, Mikhail, Galina Kashevarova, and Danil Starobogatov. "NUMERICAL MODELING AND FULL-SCALE EXPERIMENTS OF GLUED WOODEN STRUCTURES JOINT DESTRUCTION ON CARBON-FIBER DOWEL PINS." International Journal for Computational Civil and Structural Engineering 16, no. 2 (2020): 101–12. http://dx.doi.org/10.22337/2587-9618-2020-16-2-101-112.

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This paper presents the results of numerical modeling and full-scale experiments of the failure process of a glued laminated timber beam with rigid joint in the middle. All the connecting parts are made of carbon fiber. The structural analysis is done with the finite element method (ANSYS software). The nonlinear problem was solved. The contact interaction of the structural elements in the process of deformation and fracture, as well as orthotropy of the wood, the transversely isotropic properties of the plates, and the real diagrams of the deformation of carbon fiber dowel pins were taken int

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33

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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LI, S. Q., J. F. CHEN, L. A. BISBY, Y. M. HU, and J. G. TENG. "STRAIN EFFICIENCY OF FRP JACKETS IN FRP-CONFINED CONCRETE-FILLED CIRCULAR STEEL TUBES." International Journal of Structural Stability and Dynamics 12, no. 01 (2012): 75–94. http://dx.doi.org/10.1142/s0219455412004574.

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The confinement of concrete columns using fiber-reinforced polymer (FRP) jackets or wraps is a popular structural retrofitting technique. More recently, the benefits of FRP confinement of concrete-filled steel tubes have also been explored by researchers. Failure of such FRP-confined concrete-filled steel tubes is usually governed by the rupture of the FRP jacket in the hoop direction. However, the observed FRP hoop strain at failure (i.e. the hoop rupture strain) is typically lower than the ultimate tensile strain from a flat coupon test. Many factors may contribute to this phenomenon, one of

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35

Reddy, Dr P. Ravinder, P. RamaLakshmi P. RamaLakshmi, and P. Anjani Devi P. Anjani Devi. "Influence of Stiffeners on Fracture Parameters in Isotropic and Orthotropic Materials." International Journal of Scientific Research 2, no. 8 (2012): 157–59. http://dx.doi.org/10.15373/22778179/aug2013/53.

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36

Orgill, G., and J. F. Wilson. "Finite Deformations of Nonlinear, Orthotropic Cylindrical Shells." Journal of Applied Mechanics 53, no. 2 (1986): 257–65. http://dx.doi.org/10.1115/1.3171749.

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The nonbuckling finite deformations of an orthotropic, thin wall cylinder are investigated. The cylinder is made of a nonlinear material and subjected to internal pressure, end load and torque. Initially the stresses and strains in the cylinder are assumed to be axially homogeneous. The model is then extended to include axially nonhomogeneous stresses and strains that may arise due to particular displacement boundary conditions such as radial confinement at the edges. The loads are applied to the cylinder incrementally, the finite strains are computed, and adjustments are made in cylinder dime

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37

Luo, Ru Deng, Mei Xin Ye, and Ye Zhi Zhang. "Study on Influences of Thickness of Flange of U Rib on Mechanical Behaviors of Orthotropic Monolithic Steel Bridge Deck System." Advanced Materials Research 163-167 (December 2010): 122–26. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.122.

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Orthotropic monolithic steel bridge deck system stiffened by U rib is very fit for high-speed railway steel bridges because of its excellent mechanical behaviors. Thickness of flange is a very important parameter of U rib and has influence on mechanical behaviors of orthotropic monolithic steel bridge deck system. Based on the engineering practice of Anqing Yangtze River Railway Grand Bridge, the kind and the extents of influences of thickness of flange of U rib on mechanical behaviors of orthotropic monolithic steel bridge deck system are studied with finite element analysis. The results show

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38

Fakoor, M., R. Rafiee, and M. Sheikhansari. "The influence of fiber-crack angle on the crack tip parameters in orthotropic materials." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 3 (2016): 418–31. http://dx.doi.org/10.1177/0954406215617195.

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Identification of the critical angle between fiber and crack direction in orthotropic materials for avoiding catastrophic failure is necessary. Recognition of the optimum regions for creating notches in orthotropic materials for creation of maximum load-bearing capability is an important parameter in structural design. In this paper, the critical angles between crack and fiber direction are predicted, extracting crack tip parameters in orthotropic materials using stress series expansion and numerical method. The variations of crack tip parameters with respect to the angle between crack and fib

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Jiang, Jiali, Bachtiar Erik Valentine, Jianxiong Lu, and Peter Niemz. "Time dependence of the orthotropic compression Young’s moduli and Poisson’s ratios of Chinese fir wood." Holzforschung 70, no. 11 (2016): 1093–101. http://dx.doi.org/10.1515/hf-2016-0001.

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Abstract The time dependency of the orthotropic compliance for Chinese fir wood [Cunninghamia lanceolata (Lamb.) Hook] has been investigated by performing compressive creep experiments in all orthotropic directions. Time evolution of the creep strain in the axial and lateral directions was recorded by means of the digital image correlation (DIC) technique, to determine the diagonal and nondiagonal elements of the viscoelastic compliance matrix. The results reveal the significant influence of time on the mechanical behavior. The orthotropic nature of the viscoelastic compliance is highlighted b

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40

Raška, Jan. "Flexural/Twist Anisotropy Influence on Elastic Instability of a Plate Composite Laminate." Materials Science Forum 561-565 (October 2007): 777–80. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.777.

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The flexural/twist anisotropy, present in most balanced, symmetric laminates with angle play layers, have an important influence on elastic instability of plate composite. The maximal compression load can be reduced up to 13% in comparison with the orthotropic plate. The anisotropy changes also the deformation mode form. Based on the finite element studies, we developed an empirical law – the relation between the knockdown factor, the anisotropy factor and the plate geometry. The knockdown factor is defined as the ratio between the maximum loads of the anisotropic plate and of the orthotropic

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Zhang, De Ying, Yun Sheng Li, and Chun Lei Cui. "A Retrofitted Case Study of Orthotropic Steel Bridge Decks Strengthened with Sandwich Plate System." Advanced Materials Research 255-260 (May 2011): 866–70. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.866.

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Some retrofitted methods are introduced, and in these retrofitted methods, a strengthening case of using the sandwich plate system (SPS) to strengthen the orthotropic steel bridge deck of a suspend bridge was studied. A local finite element model is established by ANSYS based on an orthotropic steel bridge deck sample, stress distribution of deck due to the wheel load of the vehicle defined in China current code were analyzed under different loading conditions, and the strengthening effect with SPS was evaluated. The influence of the thickness and elastic modulus of elastic sandwich on the tra

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QIAO, PIZHONG, and LUYANG SHAN. "EXPLICIT LOCAL BUCKLING ANALYSIS OF ROTATIONALLY RESTRAINED COMPOSITE PLATES UNDER BIAXIAL LOADING." International Journal of Structural Stability and Dynamics 07, no. 03 (2007): 487–517. http://dx.doi.org/10.1142/s021945540700240x.

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A variational formulation of the Ritz method is used to establish an eigenvalue problem for the local buckling behavior of composite plates elastically restrained (R) along their four edges (the RRRR plates) and subjected to biaxial compression, and the explicit solution in terms of the rotational restraint stiffness (k) is presented. Based on the different boundary and loading conditions, the explicit local buckling solution for the rotationally restrained plates is simplified to several special cases (e.g. the SSSS, SSCC, CCSS, CCCC, SSRR, RRSS, CCRR, and RRCC plates) under biaxial compressi

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Guo, Li Cheng, Lin Zhi Wu, and Hong Jun Yu. "Crack Problem for a Functionally Graded Orthotropic Coating-Substrate Structure." Key Engineering Materials 353-358 (September 2007): 263–65. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.263.

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The crack problem for a functionally graded orthotropic coating-substrate structure under an in-plane load is studied. The orthotropic coating is assumed to contain a crack perpendicular to the interface. Integral transform method is used to obtain singular integral equation. Stress intensity factors (SIFs) are evaluated. The influences of orthotropic material constants and the geometry parameters on SIFs are analyzed.

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Gaspar, Rozimeiry Gomes Bezerra, Ivar Wendling, Carlos Andre Stuepp, and Alessandro Camargo Angelo. "ROOTSTOCK AGE AND GROWTH HABIT INFLUENCE TOP GRAFTING IN Araucaria angustifolia." CERNE 23, no. 4 (2017): 465–71. http://dx.doi.org/10.1590/01047760201723042447.

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ABSTRACT The objective of this study was to evaluate the technical viability and influence of the rootstock age and grafts growth habit on Araucaria angustifolia top grafting. Two rootstocks (8 and 35-year-old) were grafted with grafts originating from two growth habits (orthotropic and plagiotropic). We used the patch grafting technique in the middle and upper third of the crown of 8-year-old trees, and in the middle and lower third of 35-year-old trees, always near the apex in primary branches. The experiments were performed during the fall and spring/2015. The treatments consisted of: 8-yea

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Zouari, R., S. Ben Amar, and A. Dogui. "Experimental Analysis and Orthotropic Hyperelastic Modelling of Textile Woven Fabric." Journal of Engineered Fibers and Fabrics 9, no. 3 (2014): 155892501400900. http://dx.doi.org/10.1177/155892501400900310.

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This paper presents an experimental study and hyperelastic modelling of orthotropic mechanical behavior of woven textile fabric. The strain energy function of the hyperelastic model is a combination of the warp extension, weft extension, and shear angle between warp and weft directions. The experimental and fitting analysis of the anisotropy is realized using off-axis tensile tests for five textile woven fabrics. Orthotropic hyperelastic modelling highlights the anisotropy tensile property of textile woven fabric compared to orthotropic linear elastic modelling. Particular attention is given t

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Liu, Yao He, Guo Feng Yi, and Jian Ming Xiong. "An Analytical Solution to Metal Plane Problem in Terms of Orthotropic Anisotropy and Strain Hardening." Advanced Materials Research 97-101 (March 2010): 348–56. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.348.

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In this paper, the yield condition of Hill’s orthotropic yield criterion under axial symmetric plane stress state was discussed. The yield function of orthotropic material was proposed and the analytical solution to meet the condition of equations of equilibrium and compatibility under axial symmetric plane stress state is obtained, in which the conditions of power hardening materials was considered. The research result indicates that hardening coefficient and anisotropic parameter have substantial influence over stress and strain. However, in the presence of the coefficient R90=H/F，the influe

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Sánchez, Milagros, and Nando Troyani. "Length Influence on Stress Concentration in Orthotropic Plates." Key Engineering Materials 577-578 (September 2013): 129–32. http://dx.doi.org/10.4028/www.scientific.net/kem.577-578.129.

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Results for stress concentration in short members for isotropic plates with centered circular holes have been reported in the literature. More recently the influence of length for orthotropic holed plates has been examined and published as well. However, important aspects of stress considerations were missing such as the influence of load direction vs. material orientation which happens to have a strong influence on stress concentrations. Additionally, implied important misleading inaccuracies were reported. This analysis is meant to provide essential corrections to the published material.

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Obara, Paulina. "Analysis of orthotropic tensegrity plate strips using a continuum two-dimensional model." MATEC Web of Conferences 262 (2019): 10010. http://dx.doi.org/10.1051/matecconf/201926210010.

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A continuum two-dimensional model of orthotropic moderately thick plate strip is proposed in this paper. The model considers the different reference planes (lower, middle and upper) thus the different planes of support may be taken into account. The linear six-parameter and five-parameter shell theories are applied to the analysis. In case of a considered plate strip a number of parameters are reduced to four and to three respectively. The closed form of displacements and internal forces for any orthotropic plate strips are determined. As an example a continuum model of orthotropic tensegrity

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Zhao, Xing, and Hong Jun Wang. "Shear Horizontal Waves in Orthotropic Layer/Piezoelectric Cylinder Structures." Advanced Materials Research 905 (April 2014): 105–8. http://dx.doi.org/10.4028/www.scientific.net/amr.905.105.

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This paper investigates the dispersion characteristics of shear horizontal waves propagating in a piezoelectric cylinder covered by orthotropic layer. The surface of the orthotropic layer is assumed to be mechanically free; The stress and displacement at the interface is continuous. The solution of the equation is expressed by Bessel function, and the dispersion equation is derived by using the boundary conditions and the interface conditions, the numerical examples are provided to show the influences of the orthotropic degree and the properties of piezoelectric materials on the dispersion cha

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Zhuang, Y., and K. Y. Wang. "Three-dimensional behavior of biaxial geogrid in a piled embankment: numerical investigation." Canadian Geotechnical Journal 52, no. 10 (2015): 1629–35. http://dx.doi.org/10.1139/cgj-2014-0538.

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Biaxial geogrid in current research is oversimplified, and the three-dimensional orthotropic nature of the biaxial geogrid has not been fully understood in numerical investigations. A comparative study on three modeling approaches for the biaxial geogrid is presented in this paper, including the isotropic membrane model, the orthotropic membrane model, and the truss element model. It shows that the orthotropic membrane model yields practically identical results of the maximum geogrid tension when compared with the truss element model, whereas the isotropic membrane model tends to yield values

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