An Estimation of Dynamic Modulus of Elasticity in Cantilever Flexural Timber Beams

Roohnia, Mehran

doi:10.5552/drind.2014.1229

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…Dynamic behaviors of the composite materials and structures were investigated in order to improve the damping behavior at high temperatures [ 12 , 13 , 14 ]. Many authors have investigated dynamic characteristics of composite materials and structures using free vibration methods [ 15 , 16 , 17 , 18 , 19 , 20 ]. Adding reinforcement particles to the metal matrix composites can change their mechanical and dynamic properties.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics Study for Surface Composite of AMMNCs Matrix Fabricated by Friction Stir Process

Moustafa

2018

Materials

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In the present work, Aluminum Metal Matrix Surface Nano Composites (AMMSNCs) were manufactured using Friction Stir Processing (FSP). Moreover, the fabricated surface composite matrix was exposed to a different number of tool passes with different processing parameters. The tensile test and microstructure examinations were used to study the mechanical properties of the composite surface. The dynamic properties were predicted using modal analysis and finite element methods. After this, dynamic characterization was achieved by combining the numerical and experimental methods to investigate the effects of changing the number of passes on the natural frequency and the damping capacity of the AMMSNCs manufactured using FSP. The results indicated that the damping capacity and dynamic behavior improved with an increased number of FSP passes.

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Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics Study for Surface Composite of AMMNCs Matrix Fabricated by Friction Stir Process

Moustafa

2018

Materials

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“…In fact, the base of the ASTM criterion [26] test method to characterize dynamic elastic properties was set by those researchers, using the impulse excitation technique [27]. To date, several researchers have investigated the estimation of the elastic properties of laminated composites [28][29][30][31][32][33], timber materials [34,35], or concrete materials [36], which are non-isotropic and/or inhomogeneous, using vibration-based approaches. It is important to note that the standard tests for dynamic properties gain significant supports from scientific and engineering communities in present days.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations into Dynamic Modal Parameters of Fiber-Reinforced Foamed Urethane Composite Beams in Railway Switches and Crossings

Sengsri¹,

Ngamkhanong²,

Melo³

et al. 2020

Vibration

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Dynamic behaviors of composite railway sleepers and bearers in railway switches and crossings are not well-known and have never been thoroughly investigated. In fact, the dynamic properties of the full-scale composite sleepers and bearers are not available in practice. Importantly, the deteriorated condition or even the failure of composite materials and components in the railway system can affect the functional limitations or serviceability of the switches and crossings. Especially, it is important to identify the dynamic modal parameters of Fiber-reinforced Foamed Urethane (FFU) composite railway sleepers and bearers so that track engineers can adequately design and optimize the structural components with their superior properties, for benchmarking with the conventional sleepers and bearers. This paper is the world’s first to investigate the vibration characteristics of full-scaled FFU composite beams in healthy and damaged conditions, using the impact hammer excitation technique. This study also determines the dynamic elastic modulus of FFU composite beams from experimental dynamic measurements. It is found that the first bending mode in a vertical plane obviously is the first dominant mode of resonance under a free-free condition. The dynamic modal parameters reduce when damages occur. In this study, finite-element modeling has been used to establish a realistic dynamic model of the railway track incorporating FFU composite sleepers and bearers. Then, numerical simulations and experimental campaigns have been performed to enable new insights into the dynamic behaviors of composite sleepers and bearers. These insights are fundamental to the performance benchmarking as well as the development of vibration-based condition monitoring and inspection for predictive track maintenance.

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“…Among the static tests, the three-and four-point bending tests are used to determine the modulus of elasticity [20] and the plate-twist method is used to determine the shear modulus [21]. In the dynamic bending tests, the specimen can be clamped as a cantilever [22][23][24], whereby the boundary conditions, i.e., the stiffness of the clamping, must be taken into account, or the specimen can be free at both ends. As with both cantilever and free-free specimens, inertia and shear effects must be taken into account for smaller length-to-height ratios [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Determination of Elastic Properties of Beech Plywood by Analytical, Experimental and Numerical Methods

Merhar

2020

Forests

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This research article examines the application of various methods to determine the effective elastic properties of beech veneer-wood composites. Using laminate theory, the theoretically calculated effective values of the in-plane and out-of-plane modulus of elasticity as well as shear modulus are compared with the values determined from the natural frequencies of flexural, torsional and longitudinal vibrations of samples having different orientations and numbers of composite layers. The samples are also modelled using the finite element method, and their natural frequencies are calculated by the modal analysis. Research has shown that the laminate theory, which is well established and applied in the world of synthetic composites, can also be applied to beech plywood composites, where the theoretically calculated effective values can be up to 15% higher. Similarly, due to the higher calculated effective elastic properties, higher natural frequencies of flexural, torsional and longitudinal vibrations are also calculated by the finite element method.

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An Estimation of Dynamic Modulus of Elasticity in Cantilever Flexural Timber Beams

Abstract: Sažetak • Zbog utjecaja otklona smicanjem i rotacijskog pomaka vrlo je teško odrediti modul elastičnosti kon

Cited by 6 publications

References 17 publications

Dynamic Characteristics Study for Surface Composite of AMMNCs Matrix Fabricated by Friction Stir Process

Dynamic Characteristics Study for Surface Composite of AMMNCs Matrix Fabricated by Friction Stir Process

Experimental and Numerical Investigations into Dynamic Modal Parameters of Fiber-Reinforced Foamed Urethane Composite Beams in Railway Switches and Crossings

Determination of Elastic Properties of Beech Plywood by Analytical, Experimental and Numerical Methods

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