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Dai Gil Lee

Bio: Dai Gil Lee is an academic researcher from KAIST. The author has contributed to research in topics: Composite number & Epoxy. The author has an hindex of 44, co-authored 321 publications receiving 7620 citations. Previous affiliations of Dai Gil Lee include Samsung Heavy Industries & Chonbuk National University.


Papers
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TL;DR: In this paper, nano-particle additives such as carbon black and nanoclay were mixed with epoxy resin to improve the fracture toughness of fiber-reinforced composites, and they measured the single edge notched bend specimen at the room (25°C) and cryogenic temperature (−150°C).

346 citations

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TL;DR: In this article, a one-piece automotive hybrid aluminum/composite drive shaft was developed with a new manufacturing method, in which a carbon fiber epoxy composite layer was co-cured on the inner surface of an aluminum tube rather than wrapping on the outer surface to prevent the composite layer from being damaged by external impact and absorption of moisture.

126 citations

Journal ArticleDOI
Woo Seok Chin1, Dai Gil Lee1
TL;DR: In this article, the conductive carbon black with the binder matrix of the E-glass/polyester composite has been used for fabricating the radar absorbing structure (RAS) of desired performance.

118 citations

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TL;DR: In this article, the authors describe the use of sandwich structures in load bearing structures due to their high specific stiffness and high specific strength, such as the ones used in this paper.
Abstract: In recent times, sandwich structures have been widely used in load bearing structures due to their high specific stiffness and high specific strength. Some sandwich structures, such as those used i...

116 citations

Journal ArticleDOI
TL;DR: In this article, a bipolar plate for automotive fuel cells was developed with carbon fiber composite by compression molding due to the fact that carbon/epoxy composite has not only high electrical and thermal conductivities, but also high specific stiffness and strength.

105 citations


Cited by
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TL;DR: A comprehensive review of literature on bio-fiber reinforced composites is presented in this paper, where the overall characteristics of reinforcing fibers used in biocomposites, including source, type, structure, composition, as well as mechanical properties, are reviewed.

3,074 citations

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TL;DR: In this article, the synthesis, curing process, and application of epoxy resins are reviewed and a review of the final properties of cured epoxide resins is presented. But, the authors do not consider the type of epoxide resin, curing agent, and curing process.

1,132 citations

Journal ArticleDOI
TL;DR: In this article, an overview of available theories and finite elements that have been developed for multilayered, anisotropic, composite plate and shell structures is presented. But, although a comprehensive description of several techniques and approaches is given, most of this paper has been devoted to the so called axiomatic theories and related finite element implementations.
Abstract: This work is an overview of available theories and finite elements that have been developed for multilayered, anisotropic, composite plate and shell structures. Although a comprehensive description of several techniques and approaches is given, most of this paper has been devoted to the so called axiomatic theories and related finite element implementations. Most of the theories and finite elements that have been proposed over the last thirty years are in fact based on these types of approaches. The paper has been divided into three parts. Part I, has been devoted to the description of possible approaches to plate and shell structures: 3D approaches, continuum based methods, axiomatic and asymptotic two-dimensional theories, classical and mixed formulations, equivalent single layer and layer wise variable descriptions are considered (the number of the unknown variables is considered to be independent of the number of the constitutive layers in the equivalent single layer case). Complicating effects that have been introduced by anisotropic behavior and layered constructions, such as high transverse deformability, zig-zag effects and interlaminar continuity, have been discussed and summarized by the acronimC -Requirements. Two-dimensional theories have been dealt with in Part II. Contributions based on axiomatic, asymtotic and continuum based approaches have been overviewed. Classical theories and their refinements are first considered. Both case of equivalent single-layer and layer-wise variables descriptions are discussed. The so-called zig-zag theories are then discussed. A complete and detailed overview has been conducted for this type of theory which relies on an approach that is entirely originated and devoted to layered constructions. Formulas and contributions related to the three possible zig-zag approaches, i.e. Lekhnitskii-Ren, Ambartsumian-Whitney-Rath-Das, Reissner-Murakami-Carrera ones have been presented and overviewed, taking into account the findings of a recent historical note provided by the author. Finite Element FE implementations are examined in Part III. The possible developments of finite elements for layered plates and shells are first outlined. FEs based on the theories considered in Part II are discussed along with those approaches which consist of a specific application of finite element techniques, such as hybrid methods and so-called global/local techniques. The extension of finite elements that were originally developed for isotropic one layered structures to multilayerd plates and shells are first discussed. Works based on classical and refined theories as well as on equivalent single layer and layer-wise descriptions have been overviewed. Development of available zig-zag finite elements has been considered for the three cases of zig-zag theories. Finite elements based on other approches are also discussed. Among these, FEs based on asymtotic theories, degenerate continuum approaches, stress resultant methods, asymtotic methods, hierarchy-p,_-s global/local techniques as well as mixed and hybrid formulations have been overviewed.

839 citations

Journal ArticleDOI
TL;DR: In this article, the most commercially available fiber metal laminates (FMLs) are ARALL (Aramid Reinforced Aluminium Laminate), based on aramid fibres, GLARE (Glass Reinforced Aluminum Laminate) based on high strength glass fibres and CARALL (Carbon Reinforced Alloy Laminate, based on carbon fibres).

761 citations

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TL;DR: In this paper, the authors reviewed the work done in analysing the various sources of geometric errors that are usually encountered on machine tools and the methods of elimination or compensation employed in these machines.
Abstract: Accuracy of machined components is one of the most critical considerations for any manufacturer. Many key factors like cutting tools and machining conditions, resolution of the machine tool, the type of workpiece etc., play an important role. However, once these are decided upon, the consistent performance of the machine tool depends upon its ability to accurately position the tool tip vis-a-vis the required workpiece dimension. This task is greatly constrained by errors either built into the machine or occurring on a periodic basis on account of temperature changes or variation in cutting forces. The three major types of error are geometric, thermal and cutting-force induced errors. Geometric errors make up the major part of the inaccuracy of a machine tool, the error caused by cutting forces depending on the type of tool and workpiece and the cutting conditions adopted. This part of the paper attempts to review the work done in analysing the various sources of geometric errors that are usually encountered on machine tools and the methods of elimination or compensation employed in these machines. A brief study of cutting-force induced errors and other errors is also made towards the end of this paper.

652 citations