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Multiscale or multi-physics modeling play a major role in many important problems today. In the past few years, there have been increasingly growing research activities aiming at developing novel multiscale computational methods. In this work, we focus on one challenge multiscale heterogeneous problem, modeling electromagnetic wave scattering from a composite unmanned aerial vehicle (UAV). Two new...
Based on the laboratory experiments, the drawing galling behavior in macro-scale is investigated in the square cup drawing of a high tensile strength steel SPFC590 in semi-dry condition. When using the non-coated dies (cold alloy tool steel (SKD11, SLD) and austempered ductile irons (ADI)) in semi-dry, the macro-scale galling can clearly observed on die and drawn cup surface after a few drawing cycles...
Fine blanking process on plane blank holder utilizes three tooling elements: a punch, a plane blank holder and an ejector to generate a highly compressive stress state and pure shearing forces to constraint the deformation of sheet metal within the narrow blanking clearance zone. Numerical simulation of fine blanking for steel 20 was performed using commercial FEM software DEFORM, and element deletion...
Extracted data from a tensile test applied on a compact tension specimen are not sufficient to have an accurate statement about fracture mechanical properties of materials. Verification of these data using finite element analysis cannot be directly validated on the crack tip due to its singularity and material nonhomogeneity. This paper presents implementation of digital image correlation (DIC) algorithms...
Machining simulation and deformation prediction are effective approaches to improve machining error in processing thin-walled parts. However, the empirical studies are still insufficient to improve this problem. This paper uses the finite element method, through cutting process modeling, material removal modeling and calculating the initial residual stresses in machining process to predict and analyze...
In order to protect electronic components on a Printed Circuit Board (PCB) against electromagnetic radiation/wave, a shielding in the form of an electrically conductive shield-can or box is normally attached on the PCB covering the electronic components. The attached shield-can could provide an additional mechanical strength and minimize the out-of-plane deformation especially where the electronic...
When the gun fires in rapid firing rate, serious factors such as the high ambient temperatures, thermal transients and corrosive-erosive environment existing at the bore surface limit the barrel life. Therefore, most of the current gunpsilas rifling is produced by the radial forging process of the high-alloy steel. The residual stresses in the forged product directly affect the fatigue strength, stress...
The thermal sensitivity of acoustic-wave-based devices still is an optimization key-point for various applications (filters, sources, sensors). As the architecture of such devices becomes more and more complex to fit the RF manufacturer requirements, simple analytical models usually exploited to optimize their frequency thermal drift are found obsolete. The optimization of these complex periodic wave-guide...
In this paper, a composite insulator with seven years running history at power grid was taken into account. At first, an electric field was computed through finite elements method and electric field difference at different shed was compared. Secondly, through SEM photos of silastic sections from different sheds, microcosmic structure character of silastic aging under electric and ultraviolet effect...
A robotic gasbag polishing technique based on flexible polishing principle can make polishing process more stable and effective because the rubber provides cushioning action and almost all abrasive powders in the contact area are involved in the process of material removal on mould surface. Finite element method using Mooney-Rivlin constitutive model is adopted to obtain a referenced result of contact...
In this paper, the effect of applying a thin mu-varistor material layer to composite insulator structure is presented for the rain test. In the finite-element-method (FEM) simulations, thin resistive layers are modeled as 2D surfaces instead of 3D volume bodies which helps to avoid problems within the geometric modeling process and moreover results in less degrees of freedom. Numerical simulations...
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