Earticle

This paper introduces a study on measuring the 3D vibration displacement of plate structure using Digital Image Correlation (DIC) applied to stereo digital continuous camera images. The proposed method is a non-contact 3D displacement measurement method that does not require physical sensors to be attached to the structure, and it has the advantage of simultaneously measuring dynamic displacements at multiple points on the structure. Theoretically, multiple cameras can be used, but in this study, two cameras were used to capture continuous images of the vibrating structure, and the image coordinates of multiple tracking points at arbitrary positions on the structure were measured using correlation matching. Using these image coordinates as input data, the dynamic 3D positions were calculated through Space intersection, successfully determining the 3D dynamic displacements. The measured dynamic displacements were validated for accuracy by comparing them with values measured by laser displacement sensors. And frequencies of measured data were validated by comparing with computational modal analysis by Finite Element Model (FEM).

The light weight foamed concrete has many advantages. Because there are many pores in the matrix of concrete at the viewpoint of the insulation and fire resistance. Therefore it has been used in applications requiring insulation. The insulation property of light weight foamed concrete varies according to density. Also, density is varies according to hardened matrix and pore rate. The purpose of the experiment is to know the thermal properties of light weight foamed concrete according to the change of density and the shape of iron plate, when heating the light weight foamed concrete. The results of this experiment are as follows. The higher density of concrete, the lower temperature of that. This tendency is not same as that of ordinary light weight foamed concrete. It seems that temperature decrease of concrete can be affected by vapor phenomenon of inner water of concrete when concrete is heated. The specimen of density 0.9 is showed lowest temperature. Also, the perforated specimen was efficient in preventing temperature increase.

In this study, 4 types of specimens different the way of shear transfer was tested. In this study, different four types of specimens for RC and SC wall-slab joint was tested. To investigate the joint performance of the specimens, distribution of shear force and fixidity between wall and slab was surveyed by monotonic loading. We selected 3 types of transfer mechanism of shear force to the wall-slab joint ; 1. The shear force resister by the friction on the joint surface, 2. The shared shear force by the shear plate, 3. The shared shear force by studs on the joint surface. and evaluate the degree of contribution of each part in shear transfer. Especially, slippage of the top rebar was investigated to evaluate the fixidity of the wall-slab joint.

specimens for RC and SC wall-slab joint was tested. To investigate the joint performance of the specimens, distribution of shear force and fixidity between wall and slab was surveyed by monotonic loading. We selected 3 types of transfer mechanism of shear force to the wall-slab joint ; 1. The shear force resister by the friction on the joint surface, 2. The shared shear force by the shear plate, 3. The shared shear force by studs on the joint surface. and evaluate the degree of contribution of each part in shear transfer. Especially, slippage of the top rebar was investigated to evaluate the fixidity of the wall-slab joint.

This study describes the structural properties of high-strength 600 Mpa steel developed for high-rise structure. In this study, we introduce the developmental criteria of 600Mpa steel, which was already well-established for its practical use in Japan. Furthermore, this study analyze the mechanical characteristic, axial load test, and flexural test of the same rank of Korean steel by comparing the experimental results from beam-column steel from Japan, providing the fundamental database for the related research field in Korea. The 600Mpa steel produced in Korea, when compared with that of Japan, exerts high yielding ratio, whereas low elongation ratio. Given this analysis, the yielding ratio should be adjusted below 80%, whereas elongation ratio should be up-regulated more than 20% to utilize for the construction of high-rise structure.

This paper presents an analyse study on structural performances of the high-strength steel material with low yield ratios, which has been developed recently by modern steel-making technology in Japan(so called, 60kg class high performance steel). The purpose of this study was to analyze the structural performance according to the low-yield-steel members of high strength steel and to predict the probability of upward movements and its applications in Korea.

In this study, when manufacturing a rectangular plate with a pinhole, the following conclusions were obtained as a result of analyzing the shape characteristics of the unit cell that fills the interior of the plate and the effect of changes in the size of the pinhole on the stress concentration coefficient. 1. The stress value generated in the case of the completely empty model was 13.9 MPa, which is an 18.8% increase in stress compared to the stress value 11.7 MPa generated in the fully filled model. However, since the weight of the empty model is 43.6% lower than that of the filled model, it is believed to be very advantageous in terms of cost. 2. The stress concentration coefficient value is lowest for the solid model and highest for the hollow model at the same d/H value. In other words, you can see that the values ​​are changing within the boxes of the solid model and hollow model. However, the grid matching model is closest to the solid model and the filling rate is as low as 33.4-9.1%, showing the most stable strength when filling empty space.

Even though we could not count the total amount of plates in Korean printing industry per year, we would suppose the total amount of plates about 20,000㎢ to 22,000㎢ per year through our printing experience. On the standard of the end of 2010, it would be the market share of plates are that CTP plate is 9,000㎢, CTcP plate is 4,000㎢ and PS plate is 9,000㎢, such as total amount of plates are 22,000㎢. When there was no installed CTP setter in Korea, the domestic plate would be over 60% market share of plate in Korean printing industry. But now it would be less than 25% market share of plate. It is necessary to develop domestic CTP thermal plate from now because we have to keep the market share of domestic plate. On the study of the surface structure of substrate, roughness, anodized layer amount and coating amount between domestic CTP thermal plate and foreign CTP thermal plate, it would be the basic to develop domestic CTP thermal plate.

If a screen printing plate with integrated meshes and patterns is manufactured by using the electro-polishing method and the open ratio of the screen printing plate mesh is constant and the aperture ratio is at least three times the conductive ink ingot size, we think that it is possible to do. The effect of mesh aperture ratio on print quality was examined through comparative experiments. Compared to the conventional screen printing plate, the screen printing plate of the electro-forming method had a good print quality. It is considered that the screen printing plate of the electro-forming type which can adjust the aperture ratio according to the user's purpose can solve the disadvantage of the ordinary screen printing plate, and the application for the solar cell can be expanded.

Acoustic emission signal is a kind of elastic wave which is caused by the release of internal energy of materials when the structure changes. The propagation characteristics of acoustic emission is important to the testing technology of a structure by acoustic emission signal. The finite element method is introduced to analyze elastic wave propagation in plate structure in the article, which mainly contains the discretization techniques of the area and time domain. The structure plate with different materials ,style and coating metal are selected in finite element simulation, the displacement contours and wave curve resulted from simulation are used to analyze the interface reflection, refraction and diffraction process as well as the wave type conversion in different medium of the elastic wave propagation . The mechanical pencil lead fracture experiment is done to verify the transient simulation of elastic wave propagation in plate structure.

Electrospinning technique is currently one of the most important methods for preparing nanofiber. It is important and essential to analyze the distribution of electric field in electrospinning machine. The electric field’s distribution in the typical electrospinning device was calculated and analyzed based on finite element calculation theory of electric field. The electric field is optimized by the optimization of the structure parameters, and a set of optimal sequence is got. Based on the experimental system of the electrospinning machine, contrast experiment is performed in before and after the optimization of electric field. The experimentation results show that the distribution of fiber diameter of polyimide non-woven fabric is equal and has an certain directivity after adding assistant electric field. The simulation analysis provides an effective reference for the optimization design of electric field’s distribution in the electro-spinning device.

A new front plate structure of ac-PDP using fence-type aluminum electrode coated with anodic aluminum oxide was investigated. In this structure, ITO and glass dielectric layer were eliminated and expensive Ag BUS electrode was replaced with aluminum. Test panels were prepared using the new structure and their luminance and discharge characteristics were examined. These results indicate that the new structure provide a new way of cost reduction and enhancement of performance of ac-PDPs

A new front plate structure of ac-PDP was explored using fence-type aluminum electrode coated with anodic aluminum oxide.[1] In this structure, ITO and glass dielectric layer were eliminated and expensive Ag BUS electrode was replaced with aluminum. Test panels were prepared using the new structure and their luminance and discharge characteristics were examined. These results indicate that the new structure provide a new way of cost reduction and enhancement of performance of ac-PDPs

In this paper, the electromagnetic characteristics of a grounded slab and a parallel-plate structure are analyzed by the Spline-type Divided-Difference Interpolation (SDDI) technique. The technique efficiently evaluates the MoM impedance matrix elements of the multifold spectral or spatial domain integrals or summation in integro differential equations. The numerical results of the proposed method agree well with those of the corresponding literatures.

A study on the progressive inelastic deformation behavior of the 316 L stainless steel cylindrical structure with plate-to-shell junction under moving temperature front was carried out by structural test and analysis. The structural test intends to simulate the thermal ratcheting behavior occurring at the reactor baffle of the liquid metal reactor as free surface of hot sodium pool moves up and down under plant transients. The thermal ratchet load that heats the specimen up to 550$^{\circ}C$ was applied repeatedly and residual deformation was measured. The thermal ratcheting test was carried out with two types of cylindrical structures, one with plate to-shell junction and the other without the junction to investigate the effects of the geometric discontinuities on the global ratcheting deformation. The temperature distributions of the test specimens were measured and were used for the ratcheting analysis. The ratchet deformations were analyzed with the constitutive equation of the non-linear combined hardening model. The analysis results were in good agreement with those of the structural tests.

The plate-type fuel assembly adopted in nuclear research reactor suffers from complicated effect induced by non-uniform irradiation, which might affect its stress conditions, mechanical behavior and thermal-hydraulic performance. A reliable numerical method is of great importance to reveal the complex evolution of mechanical deformation, flow redistribution and temperature field for the plate-type fuel assembly under non-uniform irradiation. This paper is the first part of a two-part study developing the numerical methodology for the thermal-fluid-structure coupling behaviors of plate-type fuel assembly under irradiation. In this paper, the thermal-fluid-structure coupling methodology has been developed for plate-type fuel assembly under non-uniform irradiation condition by exchanging thermal-hydraulic and mechanical deformation parameters between Finite Element Model (FEM) software and Computational Fluid Dynamic (CFD) software with Mesh-based parallel Code Coupling Interface (MpCCI), which has been validated with experimental results. Based on the established methodology, the effects of non-uniform irradiation and fluid were discussed, which demonstrated that the maximum mechanical deformation with irradiation was dozens of times larger than that without irradiation and the hydraulic load on fuel plates due to differential pressure played a dominant role in the mechanical deformation.

The plate-type fuel assembly adopted in nuclear research reactor suffers from complicated effect induced by non-uniform irradiation, which might affect stress conditions, mechanical behaviors and thermal-hydraulic performance of the fuel assembly. This paper is the Part II work of a two-part study devoted to analyzing the complex unique mechanical deformation and thermal-hydraulic characteristics for the typical plate-type fuel assembly under irradiation effect, which is on the basis of developed and verified numerical thermal-fluid-structure coupling methodology under irradiation in Part I of this work. The mechanical deformation, thermal-hydraulic performance and Mises stress have been analyzed for the typical plate-type fuel assembly consisting of support plates under non-uniform irradiation. It was interesting to observe that: the plate-type fuel assembly including the fuel plates and support plates tended to bend towards the location with maximum fission rate; the hot spots in the fuel foil appeared at the location with maximum thickness increment; the maximum Mises stress of fuel foil was located at the adjacent location with the maximum plate thickness increment et al.

In this study, the equivalent plate model is developed using a finite element method(FEM) based on the first order shear deformation theory(FSDT). The substructure synthesis method is used to consider the control surface. For the verification of the equivalent model, the results of free vibration analysis are compared with the ones of 3D wing structure modeled by using the MSC/NASTRAN.

An edge-located electromagnetic bandgap (EL-EBG) structure using a defected ground structure (DGS) is proposed to suppress resonant modes induced by edge excitation in a two-dimensional planar parallel plate waveguide (PPW). The proposed EL-DGS-EBG PPW significantly mitigates multiple transverse-magnetic (TM) modes in a wideband frequency range corresponding to an EBG stopband. To verify the wideband suppression, test vehicles of a conventional PPW, a PPW with a mushroom-type EBG structure, and an EL-DGS-EBG PPW are fabricated using a commercial process involving printed circuit boards (PCBs). Measurements of the input impedances show that multiple resonant modes of the previous PPWs are significantly excited through an input port located at a PPW edge. In contrast, resonant modes in the EL-DGS-EBG PPW are substantially suppressed over the frequency range of 0.5 GHz to 2 GHz. In addition, we have experimentally demonstrated that the EL-DGS-EBG PPW reduces the radiated emission from -24 dB to -44 dB as compared to the conventional PPW.