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Online since: July 2008
Authors: Amit Puri, Alexander D. Fergusson, John P. Dear, Andrew Morris, I. Palmer, F. Jensen
Box 49, Roskilde, Denmark a amit.puri01@imperial.ac.uk, balexander.fergusson01@imperial.ac.uk, ciain.palmer02@imperial.ac.uk, dAndy.P.Morris@eon-uk.com, efind.moehlholt.jensen@risoe.dk, f j.dear@imperial.ac.uk Keywords: optical correlation, sandwich structures, bending, failure (mechanical) Abstract.
Introduction The use of lightweight composite materials is an integral factor for aerodynamic applications, such as wind turbine blades.
However, the failures processes observed were affected by the specimen shape and loading configuration.
References [1] DNV and RISO: Guidelines for Design of Wind Turbines, Scanprint, Denmark, (2002) [2] ASTM International: ASTM C393 Standard Test Method for Core Shear Properties of Sandwich Constructions by Beam Flexure, (2000) [3] GOM mbH: ARAMIS user manual, GOM mbH, (2005) [4] M.
Online since: May 2014
Authors: Matteo Strano, Bianca Maria Colosimo, Luca Pagani
In the present case, the maximum admissible intrusion has been taken equal to δlmax = 48 mm for reasons related to design criteria of cars.A design vector x has been selected for the proposed example, with two design variables: x1 is a toughness indicator, related to the plastic material properties of the outer steel skin; the other variable x2 is a shape factor, related to its geometry.
According to the assumed combination of the linkage (or "second-stage") (7) and "first-stage" (3) models, the metamodel obtained via data fusion allows to predict a process realization at each new location x0 as:byh(x0) = bρ(x0)byl(x0) + bδ0 + (bσ2δbrδ + bσ0)' bΣ −1 h (yh − bP byl − bδ01nh) (10) where rδ = Corr(yh, yh(x0)), σ0 is a vector with entries σ0i = ρ(xi) · ρ(x0) · Cov(byl(xi), byl(x0)) ∀ i = 1, . . . , nl, yh = (yh(x1), yh(x2), . . . , yh(xnh))' are the observed Hi-Fi experimental values, P is a diagonal matrix with entries ρ(xi), i = 1, . . . , nh given in equation (8), Σh is the variancecovariance matrix of the model and 1nh ∈ Rnh is a vector of ones.Model comparison The purpose of this paper is to compare the predicting ability of the fusion model in different scenarios: in one case (scenario c, calibrated), the FEM simulations have been calibrated by tuning the material properties (K and n) of the tubular materials.
In the other scenario (nc, non-calibrated), the K and n values have been calculated using the nominal properties of the materials.
Table 1: p-value of the difference between the models and the experiments Index fusnc fusc deltafus 1 0.6441 0.7743 0.5728 2 0.0077 0.0006 0.7753 3 0.0853 0.3240 0.2757 4 0.0010 0.1995 0.2987 5 0.0777 0.4665 0.5408 6 0.5400 0.0445 0.7684 7 0.8139 0.0023 0.1894 8 0.9706 0.2702 0.6053 9 0.6751 0.1810 0.8755 To verify that the choice of the variance-covariance matrix does not affect the results, we repeated the analysis with the powered exponential covariance function: Cov[η(xi), η(xj)] = σ2ηrη(xi, xj) = σ2η exp {−d(xi, xj)} . (12) where rη(xi, xj) is a correlation function that it is dependent on the distance between two distinct points xi and xj.
In: ASME Journal of Mechanical Design 128 (2006), pp. 668-677
Online since: May 2004
Authors: William J. Weber, Weilin Jiang, C. Wang, Lu Min Wang, K. Sun
Wurtzite GaN possesses outstanding physical and chemical properties, such as wide bandgap (~3.5 eV at room temperature), high peak and saturation carrier velocity, large intrinsic dielectric breakdown field, good thermal conductivity, high melting point, high degree of hardness, and good thermal, chemical and mechanical stabilities.
Due to these properties, GaN is an excellent candidate material for applications in advanced optoelectronics and high-power, high-temperature and highfrequency electronic devices.
At the damage peak, the conversion factors R/ 0N from fluence in ions/nm2 to dose in dpa for the irradiation conditions used in this study are listed in Table 1.
The surface of GaN serves as an effective sink for trapping the mobile defects, which can significantly affect the local dynamic recovery and precipitation processes.
The low sputtering rates also do not significantly affect the depth dependence of dose.
Online since: April 2019
Authors: Oluwole Daniel Makinde, K.V. Prasad, Hanumesh Vaidya, B. Srikantha Setty
The results reveal that the fluid flow is clearly affected by the physical parameters such as thermal and concentration buoyancy parameter.
It is clear that the results obtained won't simply give important information to mechanical applications and also supplement the current writing.
Vaidya, MHD Squeeze flow and heat transfer of a nanofluid between two parallel disks with variable fluid properties and transpiration, Journal of Nanofluids, 7.3, (2017) 583-594
Manjunatha, Neelufer Z Basha, Boungiorno model for MHD nanofluid flow between rotating parallel plates in the presence of variable liquid properties, Journal of nanofluids, 8.2 (2019) 399-406
Abelman, Investigation of entropy generation in MHD and slip flow over a rotating disk with variable properties, International Journal of Heat and Mass Transfer, 70 (2014) 892-917
Online since: December 2012
Authors: Milan Simic, Mohamed Elbanhawi
This zone is easily affected by any external factors such as wind and rain.
To avoid any disturbance in the medium and any change in the properties, the sensor probe is moved slowly and is programmed to stop exactly at the desired position without any overshoots or corrections.
[13] Malik, N., An investigation into the chemistry and biology of salinity gradient solar ponds in relation to their stability and efficiency, in School of Aerospace, Mechanical and Manufacturing Engineering2011, RMIT University: Melbourne, Australia. p. 172
Online since: July 2012
Authors: Amitava Ghorai
Many of the interesting properties of solids are controlled by the imperfections in the crystal rather than by the perfect crystal.
It can be described in a general way with the following properties.
Stacking faults are rather widespread crystal structure violations largely responsible for the degree of perfection and physico-mechanical properties of crystals.
The first major effort to calculate the properties of point defects was published by Huntington [3-4].
Vashishta and Singwi [115] and Taylor [119] explain metallic properties of simple metals.
Online since: July 2013
Authors: Bo Yang, N. Vijayanand
Vijayanand2 1Department of Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, Texas 76019, USA 2Department of Mechanical and Aerospace Engineering, Florida Institute of Technology, Melbourne, Florida 32901, USA aboyang@uta.edu Keywords: cohesive zone model, delamination, empirical potential, fracture mechanics, graphene, graphite, Kirchhoff plate theory, multiscale modeling, peeling test, tearing fracture, von Karman plate theory Abstract.
Introduction The extraordinary physical and electrical properties of graphene have attracted a great amount of interest in recent time.[1-3] Graphene is a single layer of carbon atoms arranged in hexagonal ring structure with sp2 bonds between the atoms.
These atomic edges have different electrical and optical properties compared to the bulk lattice.
We assume that the details of the cohesive force law (i.e., the shape of the damage locus) would not affect much of the fracture processes at the other (greater) scales but that only the toughness matters in this case.
Liu, Stripe/kink microstructures formed in mechanical peeling of highly orientated pyrolytic graphite.
Online since: July 2022
Authors: Mudasir Mudasir, Dini Novi Rohmah, Nurul Hidayat Aprilita
The initial adsorbate concentration was one of the factors that affect the adsorption capacity.
Ngo, Preparation and adsorption properties of magnetic chitosan composite adsorbent for Cu2+ removal, J.
Narayanasamy, Microstructural, physico-chemical and mechanical characterisation of Sansevieria cylindrica fibres - An exploratory investigation, Mater.
Online since: March 2025
Authors: Tadanori Sugino, Shunsuke Yokoyama, Takumi Matsuo
This disorder is imaged as an image that accentuates defects (or surface properties), as depicted in Fig. 3(b).
When calculating the regression plane, not all of the defect shape data are targeted, and the part other than the defective protruding part is targeted affects the calculation of the direction in which the base surface is oriented due to the influence of the convex part in order to prevent.
Therefore, it is necessary to have a simulation function that can reproduce these factors so that the size of the lighting system can be considered in the simulation.
Tanaka, et al., Trans. of Japan Society of Mechanical Engineers, 66, 7(2000) 1098-1102.
Online since: September 2008
Authors: Nicolas Franceschini, Stéphane Viollet, Franck Ruffier, Julien Serres
This will occur whatever the robot's current groundspeed Vx, whatever disturbances (such as wind) affect that speed, and whatever disturbances (such as a gently sloping terrain) affect the robot's current groundheight h: in all cases, the optic flow regulator will automatically generate a groundheight proportional to the groundspeed.
It does so at any groundspeeds, raising the robot in proportion to its current groundspeed - whatever internal or external factors affect the latter - without ever measuring groundspeed or groundheight at all [60].
This property makes the principle appealing for accurate stabilization of various platforms [67], as well as for nonemissive power line detectors on-board fullscale helicopters [68].
More recently we introduced a mechanical decoupling between eye and body, and implemented a vestibulo-ocular reflex that was key to maintaining the robot's gaze perfectly fixed on the target [69].
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