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Journal articles on the topic 'Shock (Mechanics) Elasticity'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Knowles, James K. "On Maximally Dissipative Shock Waves in Nonlinear Elasticity." Journal of Elasticity 98, no. 1 (2009): 13–23. http://dx.doi.org/10.1007/s10659-009-9221-5.

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2

Burenin, A. A., and Yu A. Rossikhin. "One-dimensional problem of nonlinear elasticity theory with a structural shock wave." Soviet Applied Mechanics 26, no. 1 (1990): 91–95. http://dx.doi.org/10.1007/bf00887388.

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3

Dudko, O. V., A. A. Lapteva, and V. E. Ragozina. "Nonstationary 1D Dynamics Problems for Heteromodular Elasticity with Piecewise-Linear Approximation of Boundary Conditions." PNRPU Mechanics Bulletin, no. 4 (December 15, 2019): 37–47. http://dx.doi.org/10.15593/perm.mech/2019.4.04.

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The paper provides the investigation of a heteromodular elastic medium under dynamic loading. The heteromodularity (when the stress - strain relation depends on the deformation direction) is a distinctive feature of many natural and structural materials: rocks, porous and cohesive bulk media, fibrous and granular composites, some metal alloys, etc. The fact that the listed materials show the heteromodular property at the stage of elastic deformation should be especially taken into account when solving problems of their shock dynamics. To describe the heteromodular behavior of an elastic medium

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4

Zhao, Yalei, Hui Yan, Yiming Wang, Tianyi Jiang, and Hongyuan Jiang. "Predicting Nonlinear and Anisotropic Mechanics of Metal Rubber Using a Combination of Constitutive Modeling, Machine Learning, and Finite Element Analysis." Materials 14, no. 18 (2021): 5200. http://dx.doi.org/10.3390/ma14185200.

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Metal rubber (MR) is an entangled fibrous functional material, and its mechanical properties are crucial for its applications; however, numerical constitutive models of MR for prediction and calculation are currently undeveloped. In this work, we provide a numerical constitutive model to express the mechanics of MR materials and develop an efficient finite elements method (FEM) to calculate the performance of MR components. We analyze the nonlinearity and anisotropy characteristics of MR during the deformation process. The elasticity matrix is adopted to express the nonlinearity and anisotropy

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5

Konow, Nicolai, and Thomas J. Roberts. "The series elastic shock absorber: tendon elasticity modulates energy dissipation by muscle during burst deceleration." Proceedings of the Royal Society B: Biological Sciences 282, no. 1804 (2015): 20142800. http://dx.doi.org/10.1098/rspb.2014.2800.

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During downhill running, manoeuvring, negotiation of obstacles and landings from a jump, mechanical energy is dissipated via active lengthening of limb muscles. Tendon compliance provides a ‘shock-absorber’ mechanism that rapidly absorbs mechanical energy and releases it more slowly as the recoil of the tendon does work to stretch muscle fascicles. By lowering the rate of muscular energy dissipation, tendon compliance likely reduces the risk of muscle injury that can result from rapid and forceful muscle lengthening. Here, we examine how muscle–tendon mechanics are modulated in response to cha

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6

Dudko, Olga V., and Alexandr A. Mantsybora. "Shock Loading of Heteromodular Elastic Materials under Plane-Strain Condition." Key Engineering Materials 887 (May 2021): 634–39. http://dx.doi.org/10.4028/www.scientific.net/kem.887.634.

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The paper discusses the results of mathematical modeling the two-dimensional nonlinear dynamics of heteromodular elastic materials. The resistance of these materials under tension and compression is various. The deformation properties of the heteromodular medium are described within the framework of the isotropic elasticity theory with stress-dependent elastic moduli. In the plane strain case, it is shown that only two types of the nonlinear deformation waves can appear in the heteromodular elastic materials: a plane-polarized quasi-longitudinal wave and a plane-polarized quasi-transverse wave

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7

Hajarian, Amin, Mahdi Moghimi Zand, and Naeem Zolfaghari. "Effect of Dispersion Forces on Dynamic Stability of Electrostatically Actuated Micro/Nano-Beams in Presence of Mechanical Shocks." International Journal of Applied Mechanics 11, no. 09 (2019): 1950085. http://dx.doi.org/10.1142/s1758825119500856.

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Dispersion forces such as van der Waals and Casimir interactions become important when the size of structures shrinks. Therefore, the effective design of micro and nano-sized structures depends on appropriate consideration of these forces. In the current research, we analyzed the effect of dispersion forces on the dynamic behavior of a micro/nanobeam actuated by electrostatic forces subject to a mechanical shock. We used the Euler–Bernoulli beam theory including nonlinearities due to mid-plane stretching in our model. The equation of motion is solved using time-dependent finite element method,

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8

Segall, A. E., and J. Meeker. "Mode-I Stress-Intensity Factors for a Cracked Slab Under an Arbitrary Thermal Shock." Journal of Pressure Vessel Technology 129, no. 2 (2006): 306–12. http://dx.doi.org/10.1115/1.2716435.

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A stress intensity factor solution for a cracked slab subjected to an arbitrary thermal shock on one surface has been derived. As a first step, the transient temperature distribution was calculated for an arbitrary surface loading through the use of Duhamul’s integral relationship and the unit response for a slab that is insulated on the other face. The arbitrary nature of the transient surface loading was accommodated by a versatile polynomial containing both integral- and half-order terms. Once the resulting transient stress states were determined via elasticity theory, the resulting stress

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9

FEDOROV, A. V., N. D. MALMUTH, and V. G. SOUDAKOV. "Supersonic scattering of a wing-induced incident shock by a slender body of revolution." Journal of Fluid Mechanics 585 (August 7, 2007): 305–22. http://dx.doi.org/10.1017/s0022112007006714.

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The lift force acting on a slender body of revolution that separates from a thin wing in supersonic flow is analysed using Prandtl–Glauert linearized theory, scattering theory and asymptotic methods. It is shown that this lift is associated with multi-scattering of the wing-induced shock wave by the body surface. The local and global lift coefficients are obtained in simple analytical forms. It is shown that the total lift is mainly induced by the first scattering. Contributions from second, third and higher scatterings are zero in the leading-order approximation. This greatly simplifies calcu

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10

Ucar, H., and I. Basdogan. "Dynamic characterization and modeling of rubber shock absorbers: A comprehensive case study." Journal of Low Frequency Noise, Vibration and Active Control 37, no. 3 (2017): 509–18. http://dx.doi.org/10.1177/1461348417725954.

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Rubber or elastomeric materials are widely used for shock absorbers having elastic and viscous properties such as high inherent damping, deflection capacity, and energy storage. The dynamic properties of these components are of primary concern in designing rubber absorbers to reduce the shock loading given as well as the structure-borne noise transmissibility. Besides, the dynamic response of the mechanical systems, at where the rubber shock absorbers are used, is directly associated with the properties of the shock absorbers. In order to determine these properties of the rubber, mathematical

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11

Sano, Yukio, Koji Tokushima, and Kiyohiro Miyagi. "Multishock Compactions of Powder Media Influenced by Elastic Waves in Punch and Plug." Journal of Engineering Materials and Technology 113, no. 4 (1991): 372–81. http://dx.doi.org/10.1115/1.2904115.

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The previous theoretical predictions of the compaction of a copper powder medium, based on the assumption that the punch and plug were both a rigid body, did not satisfactorily agree with the experimental results obtained for short initial powder lengths and long plug lengths. This type of compaction amounts to cases when the plug length exceeds the second critical length which will be described below. Shock waves in a powder medium and elastic waves in the elastic punch and plug, schematically shown in space coordinate-time diagrams, suggest that the elastic wave in the plug is the probable c

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12

Akano, Theddeus T., and Omotayo Abayomi Fakinlede. "Impact Mechanics of Football Helmet with Various Shell Liner Configurations." Advanced Engineering Forum 32 (April 2019): 27–39. http://dx.doi.org/10.4028/www.scientific.net/aef.32.27.

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The structure of the skull reveals that the cranial is made up of a number of bones. These bones, except the temporomandibular joint, are joined by sutures. The adjacent bones are strongly united by a matrix of connective tissues consisting of bundles of strong collagenous fibres connecting periosteum to the bones. The little movement at the sutures contributes to the elasticity and compliance of the cranial. This composition serves as a shock absorber and distributes impact force evenly around the skull. Frequent head impacts by footballers cause concussion which leads to brain and neurologic

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13

Lammers, J. H., and A. Biesheuvel. "Concentration waves and the instability of bubbly flows." Journal of Fluid Mechanics 328 (December 10, 1996): 67–93. http://dx.doi.org/10.1017/s0022112096008658.

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This paper examines whether G. K. Batchelor's (1988) theory of the propagation of planar concentration disturbances and the occurrence of instabilities in uniform fluidized beds can be applied to bubbly flows. According to this theory the propagation of long weakly nonlinear gas volume concentration waves is governed by the Burgers equation. Experiments on the propagation of weak concentration shock waves and small, but finite, amplitude periodic waves are presented; good agreement is found with classic solutions of Burgers’ equation. For example, the phenomenon of amplitude saturation, famili

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14

Ramesh, K. T., and R. J. Clifton. "Finite Deformation Analysis of Pressure-Shear Plate Impact Experiments on an Elastohydrodynamic Lubricant." Journal of Applied Mechanics 59, no. 4 (1992): 754–61. http://dx.doi.org/10.1115/1.2894039.

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Pressure-shear plate impact experiments on an elastohydrodynamio lubricant (5P4E) are interpreted by means of a full finite deformation analysis of stress wave propagation in an elastic/viscoplastic material. The elastic response is modeled as that of a neo-Hookean solid, modified to include compressibility in such a way that the shock velocity increases linearly with increasing particle velocity; the viscoplastic response is modeled by means of a thermal activation model in which the activation energy is taken to be pressure dependent. The parameters in the elasticity relation are determined

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15

Othman, Mohamed I. A., and Ya Qin Song. "The Effect of Rotation on 2-D Thermal Shock Problems for a Generalized Magneto-thermo-Elasticity Half-Space Under Three Theories." Multidiscipline Modeling in Materials and Structures 5, no. 1 (2009): 43–58. http://dx.doi.org/10.1163/157361109787138779.

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16

Siva Prasad, A. V. S., and Sumit Basu. "Numerical study of mechanisms to minimize failure in a metal with soft backing under plane shock loading." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 471, no. 2182 (2015): 20150285. http://dx.doi.org/10.1098/rspa.2015.0285.

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In recent times, several experimental studies have reported improved ballistic penetration resistance and blast survivability of metallic structures to which an external coating of a soft elastomeric material has been applied. This work is aimed at understanding, through numerical simulations on a simple metal/elastomer flat plate geometry subjected to planar blast waves, the detailed mechanics of wave propagation, damage evolution and mitigation in a bilayer system. Void nucleation, growth and coalescence is assumed to be the damaging mechanism in the metal. A meshless technique based on smoo

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17

Segall, A. E., and R. Akarapu. "Approximate Direct and Inverse Relationships for Thermal and Stress States in Thick-Walled Vessels Under Thermal Shock." Journal of Pressure Vessel Technology 129, no. 1 (2006): 52–57. http://dx.doi.org/10.1115/1.2389002.

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Approximate solutions were derived for the transient through steady-state thermal-stress fields developed in thick-walled vessels subjected to a potentially arbitrary thermal shock. In order to accomplish this, Duhamel’s integral was first used to relate the arbitrary thermal loading to a previously derived unit kernel for tubular geometries. Approximate rules for direct and inverse Laplace transformations were then used to modify the resulting Volterra equation to an algebraically solvable and relatively simple form. The desired thermoelastic stress distributions were then determined using th

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18

Choi, Kyung K., and Jae Hwan Lee. "Sizing Design Sensitivity Analysis of Dynamic Frequency Response of Vibrating Structures." Journal of Mechanical Design 114, no. 1 (1992): 166–73. http://dx.doi.org/10.1115/1.2916911.

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A continuum design sensitivity analysis method of dynamic frequency response of structural systems is developed using the adjoint variable and direct differentiation methods. A variational approach with a non-selfadjoint operator for complex variable is used to retain the continuum elasticity formulation throughout derivation of design sensitivity results. Sizing design variables such as thickness and cross-sectional area of structural components are considered for the design sensitivity analysis. A numerical implementation method of continuum design sensitivity analysis results is developed u

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19

Benzoni-Gavage, Sylvie, Frédéric Rousset, Denis Serre, and K. Zumbrun. "Generic types and transitions in hyperbolic initial–boundary-value problems." Proceedings of the Royal Society of Edinburgh: Section A Mathematics 132, no. 5 (2002): 1073–104. http://dx.doi.org/10.1017/s030821050000202x.

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The stability of linear initial–boundary-value problems for hyperbolic systems (with constant coefficients) is linked to the zeros of the so-called Lopatinskii determinant. Depending on the location of these zeros, problems may be either unstable, strongly stable or weakly stable. The first two classes are known to be ‘open’, in the sense that the instability or the strong stability persists under a small change of coefficients in the differential operator and/or in the boundary condition.Here we show that a third open class exists, which we call ‘weakly stable of real type’. Many examples of

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20

Benzoni-Gavage, Sylvie, Frédéric Rousset, Denis Serre, and K. Zumbrun. "Generic types and transitions in hyperbolic initial–boundary-value problems." Proceedings of the Royal Society of Edinburgh: Section A Mathematics 132, no. 5 (2002): 1073–104. http://dx.doi.org/10.1017/s0308210502000537.

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The stability of linear initial–boundary-value problems for hyperbolic systems (with constant coefficients) is linked to the zeros of the so-called Lopatinskii determinant. Depending on the location of these zeros, problems may be either unstable, strongly stable or weakly stable. The first two classes are known to be ‘open’, in the sense that the instability or the strong stability persists under a small change of coefficients in the differential operator and/or in the boundary condition.Here we show that a third open class exists, which we call ‘weakly stable of real type’. Many examples of

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21

Liashok, Iaroslav, Serhii Podkopaiev, Yevhen Konopelko, et al. "ASSESSMENT OF STABILITY OF MINING DEPARTMENTS UNDER IMPACT LOADS." JOURNAL of Donetsk mining institute, no. 2 (2020): 142–54. http://dx.doi.org/10.31474/1999-981x-2020-2-142-154.

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Purpose of work. The purpose of the research is to determine the conditions for ensuring the stability of mine workings in the coal massif under the action of shock loads. Methods. To achieve this goal, analytical studies were performed using the basic provisions of classical mechanics and the theory of elasticity. In laboratory studies, experimental samples of crushed rock were used, which were placed in a steel cylinder. Results. In the course of experimental research, the influence of the impact force and the impact pulse of the falling load on the response of the plane on a pliable basis w

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22

Ma, Shang, Yeqing Chen, Zhenqing Wang, Jianhui Wang, Linmei Lyu, and Wanli Wei. "Similarity Law between Centrifuge Scale Test and Prototype Underwater Explosion." Shock and Vibration 2021 (August 3, 2021): 1–15. http://dx.doi.org/10.1155/2021/8582026.

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Shock wave and bubble pulsation caused by underwater explosion destroy the hydraulic structure. However, the realization of the underwater explosion prototype test is restricted by many factors, such as the site environment. Furthermore, the repeatability of the test scheme is not strong. The centrifuge scale test provides a new way of studying the damage degree of the structure under the action of underwater explosion. The similarity relationship refers to the bridge between the scaled model and the prototype, which cannot achieve complete similarity in practice. The centrifuge-scaled model t

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23

Rundans, Maris, and Ingunda Sperberga. "Evaluation of Thermal Shock Influence on Cordierite Using Impulse Excitation Technique and Dynamic Mechanical Analysis." Key Engineering Materials 721 (December 2016): 306–10. http://dx.doi.org/10.4028/www.scientific.net/kem.721.306.

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Mechanical fatigue due to repeated thermal shock cycling is of great importance for most materials intended for refractory applications. This work explores thermal shock resistance and cyclic thermal shock effects of cordierite ceramic made from clay-containing mixtures. Different means of detection of change in modulus of elasticity have been employed including impulse excitation and dynamic-mechanic tests (DMA). Results have shown that the elastic modulus of cordierite ceramic gradually decreases over thermal shock cycles, the sharpest change being observed after the first cycle. Unlike synt

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24

Dimitrijevic, Marija, Djordje Veljovic, Milica Posarac-Markovic, Radmila Jancic-Heinemann, Tatjana Volkov-Husovic, and Milorad Zrilic. "Mechanical properties correlation to processing parameters for advanced alumina based refractories." Science of Sintering 44, no. 1 (2012): 25–33. http://dx.doi.org/10.2298/sos1201025d.

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Alumina based refractories are usually used in metallurgical furnaces and their thermal shock resistance is of great importance. In order to improve thermal shock resistance and mechanical properties of alumina based refractories short ceramic fibers were added to the material. SEM technique was used to compare the microstructure of specimens and the observed images gave the porosity and morphological characteristics of pores in the specimens. Standard compression test was used to determine the modulus of elasticity and compression strength. Results obtained from thermal shock testing and mech

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25

Elżanowski, M., and M. Epstein. "Decay of strong shocks in non-linear elasticity." Journal of Sound and Vibration 103, no. 3 (1985): 371–78. http://dx.doi.org/10.1016/0022-460x(85)90429-8.

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26

Stonys, Rimvydas, Jurgita Malaiškienė, Jelena Škamat, and Valentin Antonovič. "Effect of Hollow Corundum Microspheres Additive on Physical and Mechanical Properties and Thermal Shock Resistance Behavior of Bauxite Based Refractory Castable." Materials 14, no. 16 (2021): 4736. http://dx.doi.org/10.3390/ma14164736.

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This paper analyses the effect of hollow corundum microspheres (HCM) on both physical-mechanical properties (density, ultrasonic pulse velocity, modulus of elasticity, and compressive strength) and thermal shock resistance behavior of refractory medium cement castable with bauxite aggregate. Moreover, the scanning electron microscopy (SEM) results of HCM and refractory castable samples are presented in the paper. It was found that the replacement of bauxite of 0–0.1 mm fraction by HCM (2.5%, 5%, and 10% by weight of dry mix) had no significant effect on the density and compressive strength of

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27

Zhu, Huai Liang, Li Feng Yu, Si Hui Liang, and Chao Qun Ni. "Mechanical Behavior and Failure Patterns of SMA Structural Functional Materials." Key Engineering Materials 591 (November 2013): 159–63. http://dx.doi.org/10.4028/www.scientific.net/kem.591.159.

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This paper presents an approach to investigate the mechanical properties and failure patterns of shape memory alloy (SMA) by experimental methods. Tests were carried out under the conditions of uniaxial tension, cycling loading and impact-tension respectively. The mechanical behaviors of NiTi SMA such as the relationship of stress-stain, super-elasticity, high damping, energy dissipation and tension-shock toughness are discussed in detail. In addition, the destroy patterns of SMA materials are analyzed for varying condition of testing. Whether ductile failure or brittle fracture is decided to

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28

Naimil, E. K., S. S. Bazalevskaya, O. M. Kugaenko, and V. S. Petrakov. "Study of acoustic parameters of lanthanum-gallium tantalate single crystals subjected to cyclic deformation and thermal shock." Industrial laboratory. Diagnostics of materials 84, no. 11 (2018): 28–35. http://dx.doi.org/10.26896/1028-6861-2018-84-11-28-35.

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The effect of crystal anisotropy and defects of the structure formed upon mechanical cyclic deformation and thermal shock on acoustic parameters such as phase velocity, attenuation coefficient, Q-factor of bulk acoustic wave (BAW) has been studied in lanthanum-gallium tantalate (LGT, La3Ta0,5Ga5,5O14) anisotropic piezoelectric single crystals using inner friction (IF) method with multiple piezoelectric vibrator at a frequency of 105 Hz. The anisotropy of the effective elasticity modulus (E), BAW phase velocity (Vp), attenuation coefficient and Q-factor was observed in anisotropic LGT single cr

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29

Dimitrijevic, M., M. Posarac, R. Jancic-Heinemman, J. Majstorovic, T. Volkov-Husovic, and B. Matovic. "Thermal shock resistance of ceramic fibre composites characterized by non-destructive methods." Processing and Application of Ceramics 2, no. 2 (2008): 115–19. http://dx.doi.org/10.2298/pac0802115d.

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Alumina based ceramic fibres and alumina based ceramic were used to produce composite material. Behaviour of composite ceramics after thermal shock treatments was investigated. Thermal shock of the samples was evaluated using water quench test. Surface deterioration level of samples was monitored by image analysis before and after a number of quenching cycles. Ultrasonic measurements were done on samples after quench tests. Dynamic Young modulus of elasticity and strength degradation were calculated using measured values of ultrasonic velocities. Strengths deterioration was calculated using th

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30

Popovic, Zdravko, and Nebojsa Todorovic. "Basic strength properties of beech wood in coppice forests G.J. "Crni Vrh - Kupinovo",." Bulletin of the Faculty of Forestry, no. 90 (2004): 141–53. http://dx.doi.org/10.2298/gsf0490141p.

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The basic mechanical properties of beech wood in coppice forest, locality Bor-Boljevac, Management unit "Crni Vrh-Kupinovo" were studied: Bending strength, modulus of elasticity in bending and shock resistance. Eight trees were taken from two series covered by the scientific-production experiment in this management unit. The statistically processed results were presented for each tree. There is a very strong correlation of the general linear form y=ax+b between the study properties, except between density and shock resistance. Static bending strength decreases mildly with tree height. The anal

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31

Lee, Yeon Hee, Hitoshi Takagi, Kazuya Ohkita, and Han Ki Yoon. "Effects of Thermal Shock on Mechanical Properties of Bamboo/PBS Green Composites." Advanced Materials Research 123-125 (August 2010): 1135–38. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.1135.

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. This paper deals with the mechanical characterization of short bamboo fiber reinforced green composites (BFGC). The effects of thermal shock on the mechanical properties of BFGC were investigated. Their flexural strength was evaluated by 3-point bending test, and Vickers hardness and elastic modulus were evaluated by a nano-indentation method. The fracture surfaces and microstructure of BFGC were examined by SEM. The results of evaluated mechanical properties (3-point bending test) after thermal shock indicated that the strength of BFGC decreased below 40°C, however the strength became const

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Polukoshko, Svetlana, Andris Martinovs, and Svetlana Sokolova. "AGING, FATIGUE AND DURABILITY OF RUBBER VIBRATION ISOLATION ELEMENTS." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 3 (June 15, 2017): 269. http://dx.doi.org/10.17770/etr2017vol3.2664.

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This paper deal with shock and vibration insulators, which usually are performed from the elastomeric (rubber-like) materials. Elastomeric materials give many engineering advantages due to their capability of absorbing input energy much better than engineering materials, high elasticity, good dynamic properties, low volume compressibility, a linear relationship between stress and strain up to strain of 15% ÷ 20%, resistance to aggressive environmental factors. Elastomeric materials are widely used in machine building, shipbuilding, civil engineering, aviation and aerospace as compensation devi

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Zhang, ZH, Y. Chen, HX Hua, and Y. Wang. "Crush dynamics of rubber tube under low velocity impact." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 3 (2013): 426–40. http://dx.doi.org/10.1177/0954406213486871.

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It is proved that hyperelastic honeycomb coatings can attenuate underwater blast loads impinged on the ship hull. The crush behavior of a unit tube cell of the coating made of rubber material is investigated in this study. A series of tests are conducted to investigate the crush dynamic behavior of the tube under low velocity impact loads. Numerical analyses are carried out to explore the impact process of the rubber tube and the role of some dynamic parameters, thereby serve as a reference in the design of new coating. Some characteristics, such as the geometric imperfections, nonlinear elast

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Polukoshko, Svetlana, Andris Martinovs, and Edgars Zaicevs. "EXPERIMENTAL STUDYING OF MECHANICAL-AND- PHYSICAL PROPERTIES OF RUBBER DURING AGEING." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 20, 2019): 214. http://dx.doi.org/10.17770/etr2019vol3.4200.

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Elastomeric materials, both natural rubber and synthetic, are widely used in industry and civil engineering, due to their unique properties: high elasticity, low volume compressibility, capability to absorb and dissipate input energy, a linear relationship between stress and strain up to strain of 15% ÷ 20%, resistance to aggressive environmental factors. Different kind of compensation devices, vibration dampers, shock absorbers are fabricated from rubber materials.At the same time the elastomeric materials nonreversible change their properties over time, this disadvantage is called ageing.In

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Azimpour-Shishevan, Farzin, Hamit Akbulut, and M. A. Mohtadi-Bonab. "Thermal Shock Behavior of Twill Woven Carbon Fiber Reinforced Polymer Composites." Journal of Composites Science 5, no. 1 (2021): 33. http://dx.doi.org/10.3390/jcs5010033.

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In the current research, the effect of cyclic temperature variation on the mechanical and thermal properties of woven carbon-fiber-reinforced polymer (CFRP) composites was investigated. To this, carbon fiber textiles in twill 2/2 pattern were used as reinforced phase in epoxy, and CFRPs were fabricated by vacuum-assisted resin-infusion molding (VARIM) method. Thermal cycling process was carried out between −40 and +120 °C for 20, 40, 60 and 80 cycles, in order to evaluate the effect of thermal cycling on mechanical and thermal properties of CFRP specimens. In this regard, tensile, bending and

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36

Heller, R. A., S. Thangjitham, and X. Wang. "Structural Reliability of Reactor Fuel Rods After Emergency Cooling." Applied Mechanics Reviews 44, no. 11S (1991): S114—S120. http://dx.doi.org/10.1115/1.3121343.

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The structural reliability of layered cylinders such as clad nuclear reactor fuel rods, subjected to a thermal shock is investigated. Emergency cooling may reduce the temperature of rods from operating conditions to lower levels in seconds. The high rate of temperature change requires the solution of a coupled thermo-elasticity problem that takes into consideration the coupling effects of thermal and mechanical parameters but neglects thermal-dynamic interactions. The Fourier transform-inverse transform relationship between frequency response and impulse response is used to calculate stresses

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Funtan, Sebastian, Philipp Michael, and Wolfgang H. Binder. "Synthesis and Mechanochemical Activity of Peptide-Based Cu(I) Bis(N-Heterocyclic Carbene) Complexes." Biomimetics 4, no. 1 (2019): 24. http://dx.doi.org/10.3390/biomimetics4010024.

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With the class of shock-absorbing proteins, nature created some of the most robust materials combining both mechanical strength and elasticity. Their excellent ability to dissipate energy to prevent surrounding cells from damage is an interesting property that regularly is exploited for applications in biomimetic materials. Similar to biomaterials, where mechanical stimuli are transmitted into a (bio)chemical response, mechanophoric catalysts transform mechanical energy into a chemical reaction. Force transmission is realized commonly by polymeric handles directing the applied force to the mec

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CHIKHRADZE, NIKOLOZ M., CONSTANTIN POLITIS, MIKHEIL CHIKHRADZE, and GEORGE ONIASHVILI. "BULK NANOSTRUCTURED MATERIALS OBTAINED BY SHOCK WAVES COMPACTION OF ULTRAFINE TITANIUM AND ALUMINUM." International Journal of Modern Physics: Conference Series 05 (January 2012): 391–99. http://dx.doi.org/10.1142/s2010194512002279.

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Theoretical and experimental Investigations of shock wave consolidation processes of Ti - Al nano sized and ultra-disperse powder compositions are discussed. For theoretical calculations of the shock wave loaded materials were used the hydrodynamic theory and experimental adiabatic of Ti and Al . The normal and tangential stresses in the cylindrical steel tube (containers of Ti - Al reaction mixtures) were estimated using the partial solutions of elasticity theory. The mixtures of ultra-disperse Ti and nano sized (≤ 50nm) Al powder compositions were consolidated to full or near-full density by

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Martinovic, S., J. Majstorovic, V. Vidojkovic, and T. Volkov-Husovic. "Influence of the damage level during quenching on thermal shock behavior of low cement castable." Science of Sintering 42, no. 2 (2010): 211–19. http://dx.doi.org/10.2298/sos100518001m.

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In the recent decades, the use of unshaped monolithic refractories has been increasing greatly because of their significant advantages over other shaped refractory bricks of the same class. A low cement high alumina castable was synthetised and sintered at 1300?C in order to investigate thermal and mechanical properties, as well as thermal shock behavior. The water quench test was applied as an experimental method for thermal stability testing. Modification of the water quench test was performed by additional monitoring of the samples behavior during the water quench test such as implementatio

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Bajraktarova-Valjakova, Emilija, Vesna Korunoska-Stevkovska, Biljana Kapusevska, Nikola Gigovski, Cvetanka Bajraktarova-Misevska, and Anita Grozdanov. "Contemporary Dental Ceramic Materials, A Review: Chemical Composition, Physical and Mechanical Properties, Indications for Use." Open Access Macedonian Journal of Medical Sciences 6, no. 9 (2018): 1742–55. http://dx.doi.org/10.3889/oamjms.2018.378.

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BACKGROUND: The high esthetic expectations from the prosthodontic restorations have directed the qualitative development of the materials towards the all-ceramic materials that are capable of replacing porcelain-fused-to-metal systems. AIM: This article reviews the literature covering the contemporary all-ceramic materials and systems with a focus on the chemical composition and materials’ properties; also it provides clinical recommendations for their use. RESULTS: The glass-matrix ceramics and polycrystalline ceramics are presented, as well as recently introduced machinable mater

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Augustine, Egwu Ogugua, and Akunna GG. "Occupation related differences in the thickness of metatarsal fat pads: an in vivo assessment in a young male adult population." Bangladesh Journal of Medical Science 17, no. 2 (2018): 245–50. http://dx.doi.org/10.3329/bjms.v17i2.35878.

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Background: The foot combines mechanical complexities with structural strength to withstand pressure and the metatarsal fat pads play a major role in this.Methods Material: In this study, we determined the metatarsal fat pad thickness of 40 male students that constituted a control group and an age-matched 40 male auto mechanic artisans within Abakaliki metropolis, southeast Nigeria, which served as the quasi-experimental group. Evaluation was made using a brightness mode ultrasound system. Their weights, heights, foot length, foot breadth and mid foot circumference were measured.Results: Resul

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Guo, Wendi, Guicui Fu, Bo Wan, and Ming Zhu. "Reconstruction of Pressureless Sintered Micron Silver Joints and Simulation Analysis of Elasticity Degradation in Deep Space Environment." Applied Sciences 10, no. 18 (2020): 6368. http://dx.doi.org/10.3390/app10186368.

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With excellent economy and properties, pressureless sintered micron silver has been regarded as an environmentally friendly interconnection material. In order to promote its reliable application in deep space exploration considering the porous microstructural evolution and its effect on macroscopic performance, simulation analysis based on the reconstruction of pressureless sintered micron silver joints was carried out. In this paper, the deep space environment was achieved by a test of 250 extreme thermal shocks of −170 °C~125 °C, and the microstructural evolution was observed by using SEM. T

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Rundans, Maris, Gaida Sedmale, Ingunda Sperberga, and Ina Pundiene. "Development of Cordierite Ceramics from Natural Raw Materials." Advances in Science and Technology 89 (October 2014): 94–99. http://dx.doi.org/10.4028/www.scientific.net/ast.89.94.

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Cordierite ceramics are known for their low CTE and high compressive strength values which affords them place in fields where demanding thermal and mechanical properties are required. Development of such ceramics is greatly dependent on materials used. If raw materials are used formation of additional phases and pore/glass formation is expected. The purpose of this research is to examine the process of cordierite development from mixed compositions formed from precursors of the natural raw materials as illite clay, dolomite and quartz sand and synthetic additives – MgO, γ-Al2O3 and their influ

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Ghiţescu, Marilena, Marius Ghiţescu, and Arina Modrea. "Some Aspects about Theoretical Static Rigidity and Experimental Static Rigidity of a New Elastic Coupling with Cylindical Bolts and Nonmetallic Elements." Acta Marisiensis. Seria Technologica 16, no. 2 (2019): 11–19. http://dx.doi.org/10.2478/amset-2019-0011.

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Abstract The elastic couplings are frequently used in mechanical transmissions design, to take over the radial, axial and angular misalignments and also to take over the shocks and the overloads that could appear. In this paper is presenting some aspects about the construction of couplings with bolts using non-metallic elements, e.g. rubber, having different hardness, the elements involved in torque transmission, in this case elastic elements, having also different dimensions or forms, in the way to have a good elasticity and capacity of vibration absorbtion, determining theoretical static rig

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Vidales-Barriguete, Alejandra, Jaime Santa-Cruz-Astorqui, Carolina Piña-Ramírez, Marta Kosior-Kazberuk, Katarzyna Kalinowska-Wichrowska, and Evangelina Atanes-Sánchez. "Study of the Mechanical and Physical Behavior of Gypsum Boards with Plastic Cable Waste Aggregates and Their Application to Construction Panels." Materials 14, no. 9 (2021): 2255. http://dx.doi.org/10.3390/ma14092255.

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The objective of this study was to analyze the physico-mechanical properties of gypsum boards including plastic waste aggregates from cable recycling. The plastic cable waste is incorporated into the gypsum matrix without going through any type of selection and/or treatment, as it is obtained after the cable recycling process. In the experimental process, gypsum boards of different dimensions were manufactured and tested for their Young’s modulus, shock-impact resistance, flexural strength, thermal conductivity, and thermal comfort. The results obtained show a significant increase in the elast

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Jani, S. M. H., and Y. Kiani. "Symmetric Thermo-Electro-Elastic Response of Piezoelectric Hollow Cylinder Under Thermal Shock Using Lord–Shulman Theory." International Journal of Structural Stability and Dynamics 20, no. 05 (2020): 2050059. http://dx.doi.org/10.1142/s0219455420500595.

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The response of a long hollow cylindrical vessel made from a piezoelectric material is considered in the present investigation. The piezoelectric vessel is subjected to a thermal shock on one surface. The generalized piezo-thermo-elasticity formulation of Lord and Shulman is adopted which contains a single relaxation time to consider the finite speed of temperature wave propagation. The response of the cylinder is assumed to be axi-symmetric. Three coupled equations are established as the governing equations, which are the equation of motion, the energy equation and the Maxwell equation. These

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Klimova-Korsmik, Olga, Gleb Turichin, Ruslan Mendagaliyev, et al. "High-Strain Deformation and Spallation Strength of 09CrNi2MoCu Steel Obtained by Direct Laser Deposition." Metals 11, no. 8 (2021): 1305. http://dx.doi.org/10.3390/met11081305.

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In this work, the critical fracture stresses during spalling of high-strength steel 09CrNi2MoCu samples obtained by direct laser deposition (DLD) were measured under shock compression of up to ~5.5 GPa. The microstructure and mechanical properties of DLD steel samples in the initial state and after heat treatment were studied and compared to traditional hot rolled one. The microstructural features of steel before and after heat treatment were revealed. The heat treatment modes of the deposit specimens on their strength properties under both static and dynamic loads have been investigated. The

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Tarkanian, Michael J., and Dorothy Hosler. "America’s First Polymer Scientists: Rubber Processing, Use and Transport in Mesoamerica." Latin American Antiquity 22, no. 4 (2011): 469–86. http://dx.doi.org/10.7183/1045-6635.22.4.469.

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AbstractAncient Mesoamericans were making rubber by at least 1600 B.C, mixing latex from Castilla elastica trees with juice from Ipomoea alba (morning glory) vines. The combination of ethnographic, archaeological and mechanical data presented in this text illustrate that ancient Mesoamericans had fully developed this process, and consciously tailored the mechanical properties of rubber to suit requirements of specific applications by altering the ratio of latex to I. alba juice. Our data focus on rubber balls, sandal soles, and rubber bands for hafting and joining. Elasticity, the mechanical p

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Chakroun, Moez, and Med Hédi Ben Ghozlen. "Simulation of Dynamic Rigidity Modulus of Brain Matter by that of Agar Gel." Biophysical Reviews and Letters 11, no. 04 (2016): 149–56. http://dx.doi.org/10.1142/s179304801650003x.

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Agar gel is a linear viscoelastic material with low deformations ([Formula: see text]). Here, characterization technique used is the rheometer-type Carri-Med “CSL 100”. This rheometer offers us the opportunity to study the gel in static and dynamic shear. The study is done at low frequencies ([Formula: see text]–[Formula: see text]). Mechanical characterization of the agar gel in terms of dynamic modulus is performed for different concentrations. The dynamic rigidity of the gel decreases with increasing concentration. The 8% agar gel simulates very well the dynamic rigidity of brain tissue at

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Lozia, Zbigniew, and Piotr Zdanowicz. "Simulation assessment of the half-power bandwidth method in testing shock absorbers." Open Engineering 11, no. 1 (2020): 120–29. http://dx.doi.org/10.1515/eng-2021-0011.

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AbstractThe work deals with usability of the half-power bandwidth method in the diagnostic testing of automotive shock absorbers. In all the simulation tests, the front and rear suspension system of a present-day medium-classmotor car was considered. At the first stage, calculations were made in the frequency domain for a linear “quarter-car” model with two degrees of freedom; then, simulations were carried out in the time domain with using a similar but strongly nonlinear model. In the latter case, actual characteristics (corresponding to those obtained from test rig measurements) of shock ab

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