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Artykuły w czasopismach na temat „Strongly orthotropic”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 13 lutego 2022

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1

Savoia, Marco, and Nerio Tullini. "Beam theory for strongly orthotropic materials." International Journal of Solids and Structures 33, no. 17 (July 1996): 2459–84. http://dx.doi.org/10.1016/0020-7683(95)00163-8.

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Kellermann, D. C., T. Furukawa, and D. W. Kelly. "Strongly orthotropic continuum mechanics and finite element treatment." International Journal for Numerical Methods in Engineering 76, no. 12 (December 17, 2008): 1840–68. http://dx.doi.org/10.1002/nme.2379.

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3

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 (September 22, 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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4

Sobota, P. M., and K. A. Seffen. "Bistable polar-orthotropic shallow shells." Royal Society Open Science 6, no. 8 (August 2019): 190888. http://dx.doi.org/10.1098/rsos.190888.

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We investigate stabilizing and eschewing factors on bistability in polar-orthotropic shells in order to enhance morphing structures. The material law causes stress singularities when the circumferential stiffness is smaller than the radial stiffness ( β < 1), requiring a careful choice of the trial functions in our Ritz approach, which employs a higher-order geometrically nonlinear analytical model. Bistability is found to strongly depend on the orthotropic ratio, β , and the in-plane support conditions. An investigation of their interaction offers a new perspective on the effect of the hoo

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5

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 (March 4, 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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6

Fink, Marcel, Olaf Andersen, Torsten Seidel, and André Schlott. "Strongly Orthotropic Open Cell Porous Metal Structures for Heat Transfer Applications." Metals 8, no. 7 (July 19, 2018): 554. http://dx.doi.org/10.3390/met8070554.

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For modern thermal applications, open cell porous metals provide interesting opportunities to increase performance. Several types of cellular metals show an anisotropic morphology. Thus, using different orientations of the structure can boost or destroy the performance in thermal applications. Examples of such cellular anisotropic structures are lotus-type structures, expanded sheet metal, and metal fiber structures. Lotus-type structures are made by casting and show unidirectional pores, whereas expanded sheet metal structures and metal fiber structures are made from loose semi-finished produ

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7

A., Jayantha Pasdunkorale, and Ian W. Turner. "Generalised finite volume strategies for simulating transport in strongly orthotropic porous media." ANZIAM Journal 44 (April 1, 2003): 443. http://dx.doi.org/10.21914/anziamj.v44i0.690.

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8

Kunte, M. V., and Venkata R. Sonti. "Asymptotic wavenumber expansions of a strongly orthotropic fluid-filled circular cylindrical shell." Wave Motion 50, no. 3 (April 2013): 402–14. http://dx.doi.org/10.1016/j.wavemoti.2012.10.003.

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9

Filiou, C., and C. Soutis. "Approximate Biaxial Stress Solution for Orthotropic Open-Hole Composite Laminates." Advanced Composites Letters 5, no. 4 (July 1996): 096369359600500. http://dx.doi.org/10.1177/096369359600500402.

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A simple approximate solution has been derived for the stress distribution near a circular hole applicable to any orthotropic composite laminate subjected to biaxial loading. The degree of accuracy of this solution was found to be overall acceptable, but strongly dependent upon the laminate lay-up and biaxiality ratio.

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10

Cansiz, Baris, Hüsnü Dal, and Michael Kaliske. "Computational modeling of cardiac tissue with strongly coupled electromechanics and orthotropic viscoelastic effects." PAMM 14, no. 1 (December 2014): 119–20. http://dx.doi.org/10.1002/pamm.201410047.

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11

Turner, C. H., and S. C. Cowin. "Errors Induced by Off-Axis Measurement of the Elastic Properties of Bone." Journal of Biomechanical Engineering 110, no. 3 (August 1, 1988): 213–15. http://dx.doi.org/10.1115/1.3108433.

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Misalignment between the axes of measurement and the material symmetry axes of bone causes error in anisotropic elastic property measurements. Measurements of Poisson’s ratio were strongly affected by misalignment errors. The mean errors in the measured Young’s moduli were 9.5 and 1.3 percent for cancellous and cortical bone, respectively, at a misalignment angle of 10 degrees. Mean errors of 1.1 and 5.0 percent in the measured shear moduli for cancellous and cortical bone, respectively, were found at a misalignment angle of 10 degrees. Although, cancellous bone tissue was assumed to have orth

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12

Colli Franzone, Piero, Luca F. Pavarino, and Simone Scacchi. "Bioelectrical effects of mechanical feedbacks in a strongly coupled cardiac electro-mechanical model." Mathematical Models and Methods in Applied Sciences 26, no. 01 (November 2, 2015): 27–57. http://dx.doi.org/10.1142/s0218202516500020.

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The aim of this work is to investigate by means of numerical simulations the effects of myocardial deformation due to muscle contraction on the bioelectrical activity of the cardiac tissue. The three-dimensional electro-mechanical model considered consists of the following four components: the quasi-static orthotropic finite elasticity equations for the deformation of the cardiac tissue; the active tension model for the intracellular calcium dynamics and cross-bridge binding; the orthotropic Bidomain model for the electrical current flow through the tissue; the membrane model of the cardiac my

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13

Rossovskii, L. E., and A. L. Tasevich. "The first boundary-value problem for strongly elliptic functional-differential equations with orthotropic contractions." Mathematical Notes 97, no. 5-6 (May 2015): 745–58. http://dx.doi.org/10.1134/s0001434615050090.

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14

Kergaßner, Andreas, Johannes A. Koepf, Matthias Markl, Carolin Körner, Julia Mergheim, and Paul Steinmann. "A Novel Approach to Predict the Process-Induced Mechanical Behavior of Additively Manufactured Materials." Journal of Materials Engineering and Performance 30, no. 7 (April 12, 2021): 5235–46. http://dx.doi.org/10.1007/s11665-021-05725-0.

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AbstractThe grain structure and texture of additively manufactured materials depend strongly on the local temperature gradients during the solidification of the material. These grain structures and textures influence the mechanical behavior, ranging from isotropy to transversal and orthotropic symmetry. In the present contribution, a cellular automaton is used to model the grain growth during selective electron beam melting. The resulting grain structures and textures serve as input for a mesoscopic mechanical model. The mechanical behavior on the mesoscale is modeled by means of gradient-enha

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15

Pozorski, Zbigniew, Jolanta Pozorska, Ireneusz Kreja, and Łukasz Smakosz. "On Wrinkling in Sandwich Panels with an Orthotropic Core." Materials 14, no. 17 (September 3, 2021): 5043. http://dx.doi.org/10.3390/ma14175043.

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This paper deals with the local loss of stability (wrinkling) problem of a thin facing of a sandwich panel. Classical solutions to the problem of a facing instability resting on a homogeneous and isotropic substructure (a core) are compared. The relations between strain energy components associated with different forms of core deformations are discussed. Next, a new solution for the orthotropic core is presented in detail, which is consistent with the classic solution for the isotropic core. Selected numerical examples confirm the correctness of the analytical formulas. In the last part, param

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16

Walker, C. A., and Jamasri. "The Characterization of Mixed-Mode Energy Release Rates in Orthotropic Materials." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 210, no. 1 (January 1996): 33–42. http://dx.doi.org/10.1243/pime_proc_1996_210_167_02.

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The aim of this work was to predict, from the material constants, mixed-mode energy release rates in orthotropic materials, in particular the general cases in which the crack is aligned at a random angle to the principal material direction, normal to the plane of orthotropy. Two-dimensional finite element models with various fibre orientations were generated. The finite element models were validated by comparing two sets of contour plots of deformation, one resulting from the finite element analysis and the other from moiré interferograms of the experimental work. On comparison there was shown

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17

Hidayat, Syarif, Bambang K. Hadi, Hendri Syamsudin, and Sandro Mihradi. "Stress-Distribution around Pin-Loaded Hole for Orthotropic Laminates." Applied Mechanics and Materials 842 (June 2016): 53–60. http://dx.doi.org/10.4028/www.scientific.net/amm.842.53.

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Stresses were calculated for orthotropic laminate plate loaded by a frictionless pin in a circular hole of the same diameter. These calculations were based on finite-element analysis for five laminates; 00, [±450]s, [00/900]s,[00/±450]s, and quasi-isotropic [00/±450/900]s. stress distribution, based on nominal bearing stress, were determined for wide ranges of the ratios of width to diameter and edge distance to diameter. Orthotropic had a significant influence on both the magnitude and location of the maximum tensile stress concentration on the boundary of the hole. The laminates with 00 plie

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18

Yang, Qian, Yan Ping Kong, and Jin Xi Liu. "Love Waves in a Piezoelectric Half-Space with an Anisotropic Elastic Layer." Applied Mechanics and Materials 117-119 (October 2011): 1160–63. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.1160.

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This work is concerned with the dispersion characteristics of Love waves propagating in a layered structure consisting of an anisotropic elastic layer and a piezoelectric half-space. The layer processes one symmetric plane, while the half-space is transversely isotropic. The explicit dispersion equation is derived. As an example, an inclined orthotropic material is chosen as an elastic layer to reveal the effect of material anisotropy on the dispersion behaviors. The numerical results show that the phase velocity is strongly influenced by the anisotropic degree.

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19

Tasevich, A. L. "Smoothness of Generalized Solutions of the Dirichlet Problem for Strongly Elliptic Functional Differential Equations with Orthotropic Contractions." Journal of Mathematical Sciences 233, no. 4 (July 23, 2018): 541–54. http://dx.doi.org/10.1007/s10958-018-3942-6.

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20

Arani, A. Ghorbanpour, E. Haghparast, and Z. Khoddami Maraghi. "Vibrational response of coupled orthotropic protein microtubules immersed in cytosol considering small-scale and surface effects." Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems 231, no. 3 (June 16, 2017): 131–39. http://dx.doi.org/10.1177/2397791417712851.

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In this research, orthotropic Euler–Bernoulli beam and Timoshenko beam models are developed to investigate vibrational behavior of coupled protein microtubules. Microtubules are hollow cylindrical filaments in the living cells which are surrounded by filament network, which is simulated by Winkler–Riley Model. Temperature-dependent material properties for microtubules are used to study the thermal effect on vibration frequency. To apply the size effect, nonlocal theory is utilized, and the motion equations are derived based on Hamilton’s principle. In order to examine reliability of presented

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21

Luo, Ying, and Zi Ping Wang. "Fabrication and Performance Evaluation of OPCM Array Transducer." Applied Mechanics and Materials 83 (July 2011): 109–15. http://dx.doi.org/10.4028/www.scientific.net/amm.83.109.

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Orthotropic piezoelectric compose material (OPCM) is used as functional material for a new OPCM array transducer which can be applied in a wide range of fields such as natural gas, power industry, aero-space, and other non-destructive evaluation fields. The development of ultrasonic array transducer is still in the initial stages and it can be strongly enhanced by using design tools. The transducer is designed by flat construction and composed of backing layer, OPCM array element and protective layer. A procedure and a specific constitutive model are presented in this work together with simula

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22

Djokovic, Jelena M., and Ružica R. Nikolić. "Characteristic Parameters of Dynamic Crack Growth along the Interface between the Two Orthotropic Materials." Advanced Materials Research 452-453 (January 2012): 1184–89. http://dx.doi.org/10.4028/www.scientific.net/amr.452-453.1184.

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In this paper is analyzed the behavior of parameters that characterize the process of a dynamic crack growth along the interface between the two orthotropic materials. The emphasis is placed on the application of the fracture mechanics concept for the interfacial crack that propagates dynamically, at high speed. In this work is considered the behavior of the oscillation index, the traction resolution factor and the energy factor depending on the crack tip speed and the stifnesses ratio. The oscillatory index increases with the crack tip speed and tends to infinity when the crack speed approach

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23

Lo, K. Y., and Y. N. Lee. "Time-dependent deformation behaviour of Queenston shale." Canadian Geotechnical Journal 27, no. 4 (August 1, 1990): 461–71. http://dx.doi.org/10.1139/t90-061.

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New methods for simultaneous measurement of three orthogonal strains in time-dependent deformation under several stress systems are described. Results of an extensive series of tests on oriented specimens of Queenston shale, with known magnitude and direction of in situ stress, are reported, together with tests on other shales from southern Ontario. It is found that over the stress range expected in field problems, the swelling behaviour is orthotropic and highly stress dependent. The application of stress in one principal direction not only suppresses the swelling in that direction but also r

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24

YONEDA, KEISHI, AKIO YONEZU, HIROYUKI HIRAKATA, and KOHJI MINOSHIMA. "ESTIMATION OF ANISOTROPIC PLASTIC PROPERTIES OF ENGINEERING STEELS FROM SPHERICAL IMPRESSIONS." International Journal of Applied Mechanics 02, no. 02 (June 2010): 355–79. http://dx.doi.org/10.1142/s1758825110000536.

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This study proposes a method of reverse analysis to estimate the anisotropic plastic properties of engineering steels by spherical indentation. The method takes into consideration materials that obey the work-hardening law and show in-plane anisotropic yield stress. Finite element analysis was first carried out to compute the indentation behavior of such materials, showing that a permanent impression exhibited an anisotropic shape which was strongly dependent on the orthotropic axis. Based on the anisotropy of the impression geometry, we developed a simple approach to determine the yield stres

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25

Grechka, Vladimir. "Multiple cracks in VTI rocks: Effective properties and fracture characterization." GEOPHYSICS 72, no. 5 (September 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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26

Taber, Larry A., and Jay D. Humphrey. "Stress-Modulated Growth, Residual Stress, and Vascular Heterogeneity." Journal of Biomechanical Engineering 123, no. 6 (July 25, 2001): 528–35. http://dx.doi.org/10.1115/1.1412451.

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A simple phenomenological model is used to study interrelations between material properties, growth-induced residual stresses, and opening angles in arteries. The artery is assumed to be a thick-walled tube composed of an orthotropic pseudoelastic material. In addition, the normal mature vessel is assumed to have uniform circumferential wall stress, which is achieved here via a mechanical growth law. Residual stresses are computed for three configurations: the unloaded intact artery, the artery after a single transmural cut, and the inner and outer rings of the artery created by combined radia

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27

Florisson, Sara, Johan Vessby, Winston Mmari, and Sigurdur Ormarsson. "Three-dimensional orthotropic nonlinear transient moisture simulation for wood: analysis on the effect of scanning curves and nonlinearity." Wood Science and Technology 54, no. 5 (August 14, 2020): 1197–222. http://dx.doi.org/10.1007/s00226-020-01210-4.

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Abstract This paper introduces, with the development of user-subroutines in the finite-element software Abaqus FEA®, a new practical analysis tool to simulate transient nonlinear moisture transport in wood. The tool is used to revisit the calibration of moisture simulations prior to the simulation of mechanical behaviour in bending subjected to climate change. Often, this calibration does not receive sufficient attention, since the properties and mechanical behaviour are strongly moisture dependent. The calibration of the moisture transport simulation is made with the average volumetric mass d

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28

Clauß, Sebastian, Corina Pescatore, and Peter Niemz. "Anisotropic elastic properties of common ash (Fraxinus excelsior L.)." Holzforschung 68, no. 8 (December 1, 2014): 941–49. http://dx.doi.org/10.1515/hf-2013-0189.

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Abstract Hardwoods in principle show a similar orthotropic behavior as softwoods; however, the ratios of the mechanical parameters between the three anatomical directions and their magnitudes are different and depend strongly on the individual microstructure of the species. The aim of the current study was to characterize the 3-D elastic behavior of common ash (Fraxinus excelsior L.) by tensile, compression, and shear tests in the three anatomical directions and stepwise in between, by means of a universal testing machine in combination with a digital image correlation technique. Young’s modul

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29

Venuti, Fiammetta. "Influence of pattern anisotropy on the structural behaviour of free-edge single-layer gridshells." Curved and Layered Structures 8, no. 1 (January 1, 2021): 119–29. http://dx.doi.org/10.1515/cls-2021-0011.

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Abstract Free-edge gridshells represent the majority of built gridshells. Indeed, the gridshell reference geometry usually needs to be trimmed in order to provide building access or to insert the gridshell within an existing building, giving rise to one or more elastic boundaries. Despite the current design practice, so far a very limited number of scientific studies has been devoted to investigate the influence of elastic boundaries on the overall structural behaviour of gridshells. This paper focuses on the effects of the orientation of the boundary structure with respect to the grid directi

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30

Junhao, Xu, Zhang Yingying, and Xue Jigang. "Off-axial failure analysis of polytetrafluoroethylene-coated woven glass fibers under different loading rates." Journal of Industrial Textiles 47, no. 3 (April 27, 2016): 310–30. http://dx.doi.org/10.1177/1528083716647198.

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This paper presents the research on off-axial tensile behaviors of polytetrafluoroethylene-coated woven glass fibers under different loading rates. First, groups of off-axial tensile tests were carried out, and the corresponding failure mechanisms were analyzed. Then, the effect of loading rate on the tensile behaviors of off-axial specimens was studied. Finally, several current strength criteria were compared to predict the material failure strength under different loading rates. Results show the tensile behaviors of polytetrafluoroethylene-coated woven glass fibers are typical orthotropic. T

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31

Kardomateas, G. A. "Koiter-Based Solution for the Initial Post-buckling Behavior of Moderately Thick Orthotropic and Shear Deformable Cylindrical Shells Under External Pressure." Journal of Applied Mechanics 64, no. 4 (December 1, 1997): 885–96. http://dx.doi.org/10.1115/1.2788996.

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The initial post-buckling behavior of moderately thick orthotropic shear deformable cylindrical shells under external pressure is studied by means of Koiter’s general post-buckling theory. To this extent, the objective is the calculation of imperfection sensitivity by relating to the initial post-buckling behavior of the perfect structure, since it is generally recognized that the presence of small geometrical imperfections in some structures can lead to significant reductions in their buckling strengths. A shear deformation theory, which accounts for transverse shear strains and rotations abo

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32

Yang, Ping, and Ying Tong. "Constitutive Modelling for Anisotropic Damage in Woven E-Glass Reinforcements." Open Materials Science Journal 11, no. 1 (April 28, 2017): 9–21. http://dx.doi.org/10.2174/1874088x01711010009.

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It is easy for composite laminates to be damaged by relative lower velocity impact which could give rise to internal delamination that will strongly weaken the compressive strength of laminates. In order to predict the occurrence of matrix failure, the elastic-brittle behaviors of fiber-reinforced composites were modeled constitutively by an anisotropic damage model. The dynamic tensile testing was performed at a constant velocity of 2 mm/min until the sample broke to achieve the mechanical parameters of E-glass reinforcements. The elastic constitutive equation and the constitutive damage mode

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33

Landkammer, Philipp, Andreas Loderer, Eugen Krebs, Benjamin Söhngen, Paul Steinmann, Tino Hausotte, Petra Kersting, Dirk Biermann, and Kai Willner. "Experimental Verification of a Benchmark Forming Simulation." Key Engineering Materials 639 (March 2015): 251–58. http://dx.doi.org/10.4028/www.scientific.net/kem.639.251.

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Forming of near-net-shaped and load-adapted functional components, as it is developed in theTransregionalCollaborative Research Centreon Sheet-Bulk Metal FormingSFB/TR73, causes different problems, which lead to non-optimal manufacturing results. For these high complex processes the prediction of forming effects can only be realized by simulations. A stamping process of pressing eight punches into a circular blank is chosen for the considered investigations. This reference process is designed to reflect the main aspects, which strongly affect the final outcome of forming processes. These are t

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Srivastava, P. K., P. Mahajan, P. K. Satyawali, and V. Kumar. "Observation of temperature gradient metamorphism in snow by X-ray computed microtomography: measurement of microstructure parameters and simulation of linear elastic properties." Annals of Glaciology 51, no. 54 (2010): 73–82. http://dx.doi.org/10.3189/172756410791386571.

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AbstractThe process of temperature gradient metamorphism in snow strongly affects the microstructure and associated mechanical properties of the snow. The purpose of this study was to: (1) examine the temporal variations in three-dimensional snow microstructure under the influence of a strong temperature gradient for 6 days using X-ray computed microtomography (μCT); and (2) numerically simulate the linear elastic properties of snow from microtomographic data using a voxel-based finite-element technique. The temporal changes in the snow structure were analyzed in terms of density, specific sur

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35

Martin, Isabel, Diego Saenz del Castillo, Antonio Fernandez, and Alfredo Güemes. "Advanced Thermoplastic Composite Manufacturing by In-Situ Consolidation: A Review." Journal of Composites Science 4, no. 4 (October 13, 2020): 149. http://dx.doi.org/10.3390/jcs4040149.

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This article provides an overview of the evolution of the in-situ consolidation (ISC) process over time. This evolution is intimately linked with the advancements in each of the steps of the ISC manufacturing process, is additive in nature, and is limited by the orthotropic nature of composite materials and the physicochemical behavior of the thermoplastic matrix. This review covers four key topics: (a) Thermal models—simulation tools are critical to understand a process with such large spatial gradients and fast changes. Heating systems once marked a turning point in the development of indust

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36

Knopf, Kevin B., Samantha Siegel, and Charles L. Bennett. "Avoidance of fulminant liver failure from hepatitis B reactivation with chemotherapy and immunotherapy: A value-based approach." Journal of Clinical Oncology 32, no. 30_suppl (October 20, 2014): 134. http://dx.doi.org/10.1200/jco.2014.32.30_suppl.134.

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134 Background: Fulminant liver failure (FLF) is a potentially fatal complication of hepatitis B reactivation in patients who receive rituximab and cytotoxic chemotherapy. Often patients receiving these regimens are treated with curative intent (e.g. diffuse large cell Non Hodgkin’s lymphoma, adjuvant chemotherapy for breast cancer) and thus avoidance of this complication is desirable. The only known treatment for fulminant liver failure is orthotropic liver transplant. We have developed a cost-effective approach to avoiding FLF. Methods: NCCN recommends screening for hepatitis B serologies in

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Xie, Shi Hui, Mi Mi Li, Mei Juan Zhou, Min Sun, and Shi Feng Huang. "Study on Acoustic Emission of 1-3 Orthotropic Cement Based Piezoelectric Sensors." Advanced Materials Research 487 (March 2012): 471–75. http://dx.doi.org/10.4028/www.scientific.net/amr.487.471.

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1-3 orthotropic cement based piezoelectric composites were fabricated by cut-filling and arrange-filling technique, using PZT-51 ceramic as functional material and cement as passive matrix. 1-3 orthotropic cement based piezoelectric composites were prepared into Acoustic Emission (AE) sensors, the attenuation of AE signal on the concrete and the response of different sensors on the concrete with increasing distance were researched. The results showed that the signal strength received by sensing element increases with the increasing PZT volume fraction; signal peaks and amplitude decrease gradu

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Profant, Tomáš, and Michal Kotoul. "On the Inclined Surface Crack Terminating at the Orthotropic Bimaterial Interface." Key Engineering Materials 385-387 (July 2008): 541–44. http://dx.doi.org/10.4028/www.scientific.net/kem.385-387.541.

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The evaluation of the stress singularities and generalised stress intensity factor (GSIF) for the case of an inclined surface crack terminating perpendicular to the interface between two orthotropic materials is considered. The knowledge of the regular and auxiliary solution allows evaluating the GSIF using the reciprocal theorem (Ψ-integral). A co-operating effect of a stronger and a weaker singular stress field for a crack impinging a bimaterial interface is investigated.

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Garbowski, Tomasz, Tomasz Gajewski, and Jakub Krzysztof Grabski. "Torsional and Transversal Stiffness of Orthotropic Sandwich Panels." Materials 13, no. 21 (November 6, 2020): 5016. http://dx.doi.org/10.3390/ma13215016.

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In the present work, an analytical equation describing the plate torsion test taking into account the transverse shear stiffness in sandwich plates is derived and numerically validated. Transverse shear becomes an important component if the analyzed plate or shell is thick with respect to the in-plane dimensions and/or its core has significantly lower stiffness than the outer faces. The popular example of such a sandwich plate is a corrugated cardboard, widely used in the packaging industry. The flat layers of a corrugated board are usually made of thicker (stronger) material than that used fo

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Gourgiotis, Panos A., and Davide Bigoni. "The dynamics of folding instability in a constrained Cosserat medium." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, no. 2093 (April 3, 2017): 20160159. http://dx.doi.org/10.1098/rsta.2016.0159.

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Different from Cauchy elastic materials, generalized continua, and in particular constrained Cosserat materials, can be designed to possess extreme (near a failure of ellipticity) orthotropy properties and in this way to model folding in a three-dimensional solid. Following this approach, folding, which is a narrow zone of highly localized bending, spontaneously emerges as a deformation pattern occurring in a strongly anisotropic solid. How this peculiar pattern interacts with wave propagation in the time-harmonic domain is revealed through the derivation of an antiplane, infinite-body Green’s

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Doyle, Lucía, Ingo Weidlich, and Marcus Illguth. "Anisotropy in Polyurethane Pre-Insulated Pipes." Polymers 11, no. 12 (December 12, 2019): 2074. http://dx.doi.org/10.3390/polym11122074.

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The polyurethane foam in district heating pre-insulated pipes has a critical role to play both as thermal insulation and as load bearing element, as it serves as bond between the medium pipe and the casing. Hence, knowledge on how the foam behaves under multiaxial stresses is of great importance for the design as well as for aging predictions of the network. It is known that cell shape anisotropy in polymeric foams leads to anisotropy in its mechanical properties. In this study, we evaluate and quantify the microstructural anisotropy of PU foam from pre-insulated pipes as well as its mechanica

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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 (February 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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Song, Weiju, Lingling Du, Yafei Zhang, Huimin Yin, and Changjiang Liu. "Strongly Nonlinear Damped Vibration of Orthotropic Membrane under Initial Displacement: Theory and Experiment." Journal of Vibration Engineering & Technologies, April 23, 2021. http://dx.doi.org/10.1007/s42417-021-00302-0.

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Yamada, Seishi, James G. A. Croll, and Nobuhisa Yamamoto. "Nonlinear Buckling of Compressed FRP Cylindrical Shells and Their Imperfection Sensitivity." Journal of Applied Mechanics 75, no. 4 (May 13, 2008). http://dx.doi.org/10.1115/1.2839894.

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An elastic, nonlinear, Ritz analysis has been developed to allow investigation of the imperfect behavior of axially compressed orthotropic fiber reinforced polymer cylindrical shells. In a particular mode, buckling loads are shown to be strongly influenced by the constitutive material coefficients and are sensitive to initial geometric imperfections. Just as for the previously analyzed isotropic cylindrical shells, the reduced stiffness criteria are shown to provide close lower bounds to the imperfection sensitive elastic buckling loads. The potential benefits in the use of the reduced stiffne

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Tomar, Vikas. "Modeling of Dynamic Fracture and Damage in Two-Dimensional Trabecular Bone Microstructures Using the Cohesive Finite Element Method." Journal of Biomechanical Engineering 130, no. 2 (April 1, 2008). http://dx.doi.org/10.1115/1.2903434.

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Trabecular bone fracture is closely related to the trabecular architecture, microdamage accumulation, and bone tissue properties. Micro-finite-element models have been used to investigate the elastic and yield properties of trabecular bone but have only seen limited application in modeling the microstructure dependent fracture of trabecular bone. In this research, dynamic fracture in two-dimensional (2D) micrographs of ovine (sheep) trabecular bone is modeled using the cohesive finite element method. For this purpose, the bone tissue is modeled as an orthotropic material with the cohesive para

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Childs, Dara W., and Clint R. Carter. "Rotordynamic Characteristics of a Five Pad, Rocker-Pivot, Tilting Pad Bearing in a Load-on-Pad Configuration; Comparisons to Predictions and Load-Between-Pad Results." Journal of Engineering for Gas Turbines and Power 133, no. 8 (April 6, 2011). http://dx.doi.org/10.1115/1.4000893.

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Rotordynamic data are presented for a rocker-pivot tilting pad bearing in load-on-pad (LOP) configuration for (345–3101 kPa) unit loads and speeds from 4000 rpm to 13,000 rpm. The bearing was directly lubricated through a leading edge groove with five pads, 0.282 preload, 60% offset, 57.87 deg pad arc angle, 101.587 mm (3.9995 in.) rotor diameter, 0.1575 mm (0.0062 in.) diametral clearance, and 60.325 mm (2.375 in.) pad length. Measured results were reported for this bearing by Carter and Childs (2008, “Measurements Versus Predictions for the Rotordynamic Characteristics of a 5-Pad, Rocker-Piv

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