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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Advanced Composite Structures
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Korean Society for Advanced Composite Structures
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Volume & Issues
Volume 1, Issue 3 - Sep 2010
Volume 1, Issue 2 - Jun 2010
Volume 1, Issue 1 - Mar 2010
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Elastic Buckling Analysis of Laminated Composite Plates with Embedded Square Delamination Using an Enhanced Assumed Strain Solid Element
Park, Dae-Yong ; Chang, Suk-Yoon ;
Journal of the Korean Society for Advanced Composite Structures, volume 1, issue 2, 2010, Pages 1~13
Delamination reduces an elastic buckling load of the laminated composite structures and lead to global structural failure at loads below the design level. Therefore, the problem of the delamination buckling of laminated composite structures has generated significant research interest and has been the subject of many theoretical and experimental investigations. However, questions still remain regarding a complete understanding and details of the phenomena involved. In this paper an efficient finite element model is presented for analyzing the elastic buckling behavior of laminated composite plates with square embedded delamination using a solid element based on a three-dimensional theory. The solid finite element, named by EAS-SOLID8, based on an enhanced assumed strain method is developed. The study for elastic buckling behavior of laminated composite plates with embedded square delaminations are focused on various parameters, such as support condition and width-to-thickness ratio. Both graphs and buckling modes in this paper are good guide for design of the laminated composite plates with embedded square delamination.
The Influence of the Aspect Ratio on the Natural Frequency of the Composite Laminated Plates
Han, Bong-Koo ; Suck, Ju-Won ;
Journal of the Korean Society for Advanced Composite Structures, volume 1, issue 2, 2010, Pages 14~19
Theories for advanced composite structures are too difficult for such design engineers for construction and some simple but accurate enough methods are necessary. The senior author has reported that some laminate orientations have decreasing values of
stiffnesses as the ply number increases. For such plates, the fiber orientations given above behave as specially orthotropic plates and simple formulas developed by the senior author. Most of the bridge and building slabs on girders have large aspect ratios. For such cases further simplification is possible by neglecting the effect of the longitudinal moment terms(Mx) on the relevant partial differential equations of equilibrium. In this paper. the influence of the aspect ratio on the natural frequency of the composite laminated plates is studied and it is concluded that the method used is sufficiently accurate for engineering purposes.
Development of the Hybrid CFFT Pile
Choi, Jin-Woo ; Joo, Hyung-Joong ; Nam, Jeong-Hun ; Yoon, Soon-Jong ;
Journal of the Korean Society for Advanced Composite Structures, volume 1, issue 2, 2010, Pages 20~28
In this paper, new type CFFT (Concrete Filled FRP Tube) was suggested in order to improve the flexural stiffness. Since the existing CFFT was produced by filament winding process, re-bar for concrete may be necessary in order to ensure structural safety under flexure re-bar. In comparison with existing type CFFT, new type CFFT was reinforced by circular shaped pultrusion FRP without re-bar. Filament winding FRP was attached to the outer layer of pultrusion FRP. Structural behavior of new type CFFT filled with concrete (HCFFT) was investigated by the mechanical property test for the component element and the FE analysis. Furthermore, compressive strength of the HCFFT member based on the equation suggested in previous studies.
Weighted Integral Method for an Estimation of Displacement COV of Laminated Composite Plates
Noh, Hyuk-Chun ;
Journal of the Korean Society for Advanced Composite Structures, volume 1, issue 2, 2010, Pages 29~35
In addition to the Young's modulus, the Poisson's ratio is also at the center of attention in the field stochastic finite element analysis since the parameters play an important role in determining structural behavior. Accordingly, the sole effect of this parameter on the response variability is of importance from the perspective of estimation of uncertain response. To this end, a formulation to determine the response variability in laminate composite plates due to the spatial randomness of Poisson's ratio is suggested. The independent contributions of random Poisson's ratiocan be captured in terms of sub-matrices which include the effect of the random parameter in the same order, which can be attained by using the Taylor's series expansion about the mean of the parameter. In order to validate the adequacy of the proposed formulation, several example analyses are performed, and then the results are compared with Monte Carlo simulation (MCS). A good agreement between the suggested scheme and MCS is observed showing the adequacy of the scheme.
Buckling Characteristic of Non-Circular Closed Composite Shells
Park, Won-Tae ; Chun, Kyoung-Sik ;
Journal of the Korean Society for Advanced Composite Structures, volume 1, issue 2, 2010, Pages 36~43
In this study, the buckling loads and mode shapes characteristic of circular and non-circular(elliptical) closed composite shells were analyzed. To analyses the buckling behaviors, we develop and report an improved generalized shell element called 4EAS-FS through a combination of enhanced assumed strain and the substitute shear strain fields. A flat shell element has been developed by combining membrane element with drilling degree-of-freedom and a plate bending element. The combined influences of length, thicknesses, cross-sectional parameters, and fiber-angle on the critical buckling loads and mode shapes of circular and non-circular(elliptical) closed shells are examined.
An Experimental Study on the Behaviour of Modular GFRP Deck for Use in Deteriorated Bridge Decks Replacement
Ji, Hyo-Seon ; Chunk, Kyung-Sik ;
Journal of the Korean Society for Advanced Composite Structures, volume 1, issue 2, 2010, Pages 44~50
The behaviour of Modular GFRP(Glass Fiber Reinforced Polymers) decks for use in deteriorated bridge decks replacement are investigated experimentally in this study. As for the performance evaluation of bridge decks, experimental studies on the 3 test specimens with 1/5 scale of full size were carried out. Three specimens were sandwich plates with box tube cores. The constituents of bridge decks were glass fiber preforms and epoxy resin. The experimental results of all the specimens were summarized for maximum strength, stiffness and deformation capacity. A finite element analyses were compared to verify validity of experimental results.
Performance assessment using the inverse analysis based a function approach of bridges repaired by ACM from incomplete dynamic data
Lee, Sang-Youl ; Noh, Myung-Hyun ;
Journal of the Korean Society for Advanced Composite Structures, volume 1, issue 2, 2010, Pages 51~58
This work examines the identification of stiffness reduction in damaged reinforced concrete bridges under moving loads, and carries out the performance assessment after repairing using advanced composite materials. In particular, the change of stiffness in each element before and after repairing, based on the Microgenetic algorithm as an advanced inverse analysis, is described and discussed by using a modified bivariate Gaussian distribution function. The proposed method in the study is more feasible than the conventional element-based method from computation efficiency point of view. The validity of the technique is numerically verified using a set of dynamic data obtained from a simulation of the actual bridge modeled with a three-dimensional solid element. The numerical examples show that the proposed technique is a feasible and practical method which can inspect the complex distribution of deteriorated stiffness although there is a difference between actual bridge and numerical model as well as uncertain noise occurred in the measured data.
Simple Method of Analysis for Concrete Slab Bridges by the Specially Orthotropic Laminates Theory
Han, Bong-Koo ; Suck, Jun-Ho ;
Journal of the Korean Society for Advanced Composite Structures, volume 1, issue 2, 2010, Pages 59~65
The simple supported reinforced concrete slab bridges are analyzed by the specially orthotropic laminates theory. This method, however, may be too difficult for some practising engineers. In this paper, the result of analysis for such plate by means of the beam theory with unit width is reported. By using the "correction factor", the accurate solution for the plate can be obtained by the beam theory. By using the "correction factor", the accurate solution for the plate can be obtained by the beam theory. The plate aspect ratio considered is from 1 : 1 to 1 : 6. The result of this paper can be used for simply supported slab bridges analysis.