Author
Kyo-Nam Koo
Bio: Kyo-Nam Koo is an academic researcher from University of Ulsan. The author has contributed to research in topics: Critical speed & Vibration. The author has an hindex of 6, co-authored 16 publications receiving 169 citations.
Papers
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TL;DR: In this paper, a finite element analysis of the panel flutter of composite plates including structural damping is derived from Hamilton's principle, where the first order shear deformable plate theory has been applied to structural modelling so as to obtain the finite element eigenvalue equation.
46 citations
TL;DR: In this article, the effects of shape memory alloy thin films embedded in composite plates for improving damage resistance of composite structures under low velocity impact were investigated numerically, and a finite element simulation of low-velocity impact behavior of a shape memory Alloy hybrid composite plate was performed using the ABAQUS/Explicit program.
43 citations
TL;DR: In this article, an application of composite materials to rotating disks is proposed to increase the critical speed, which is formulated by the Rayleigh-Ritz method in order to calculate the natural frequency and critical speed for rotating composite disks.
32 citations
Journal Article•
TL;DR: In this paper, the impact characteristics of shape memory alloy hybrid composites (SMAHC) were investigated, and it was shown that embedding SMAs in a composite plate can improve the impact resistance.
Abstract: To investigate impact characteristics of shape memory alloy hybrid composites (SMAHC), several experiments were performed. Tensile tests of shape memory alloy (SMA) wires were carried out to investigate thermo-mechanical properties, and low-velocity impact tests of SMAHC plates and conventional composite plates without SMAs at the critical energy level. low-velocity impact tests of several types of composite plates, including composite plates with embedded SMAs/Fe/Al wires and conventional composite plates, were also done. Results of these experiments show that embedding SMAs in a composite plate can improve the impact resistance. Lastly, low-velocity impact tests of SMAHC plates with SMA wires embedded at different positions through the thickness were performed in an effort to improve the impact resistance. Embedding SMA wires at a lower position in the composite plates was the most effective for improving the impact resistance.
16 citations
TL;DR: In this article, the effects of layerwise in-plane displacements on fundamental frequencies and specific damping capacity for composite laminated plates were investigated and the strain energies of each stress component were computed to quantify the amount of the transverse shear deformations for thin and thick plates.
13 citations
Cited by
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TL;DR: A review of the state-of-the-art in the area of dynamic analysis of composite shells can be found in this article, where the main aim is to provide a broad perspective of the current state of the art in this field.
364 citations
TL;DR: A comprehensive review of past and current research work published on the dynamic response of fiber-metal laminates subjected to low velocity impact is given in this paper, which concludes with detailed discussions on the future works needed for fibre-metal Laminates.
255 citations
TL;DR: This review is expected to provide a clear picture of layerwise theory for modeling of composite laminated structures and serve as a useful resource and guide to researchers who intend to extend their work into these research areas.
170 citations
TL;DR: A comprehensive overview of advances with regard to SMA composites and devices utilizing them is pursued, with emphasis on identifying the characteristic responses and properties of these material systems as well as on comparing the various modeling methodologies for describing their response.
Abstract: Following their discovery in the early 1960s, there has been a continuous quest for ways to take advantage of the extraordinary properties of shape memory alloys (SMAs). These intermetallic alloys can be extremely compliant while retaining the strength of metals and can convert thermal energy to mechanical work. The unique properties of SMAs result from a reversible diffussionless solid-to-solid phase transformation from austenite to martensite. The integration of SMAs into composite structures has resulted in many benefits, which include actuation, vibration control, damping, sensing, and self-healing. However, despite substantial research in this area, a comparable adoption of SMA composites by industry has not yet been realized. This discrepancy between academic research and commercial interest is largely associated with the material complexity that includes strong thermomechanical coupling, large inelastic deformations, and variable thermoelastic properties. Nonetheless, as SMAs are becoming increasingly accepted in engineering applications, a similar trend for SMA composites is expected in aerospace, automotive, and energy conversion and storage-related applications. In an effort to aid in this endeavor, a comprehensive overview of advances with regard to SMA composites and devices utilizing them is pursued in this paper. Emphasis is placed on identifying the characteristic responses and properties of these material systems as well as on comparing the various modeling methodologies for describing their response. Furthermore, the paper concludes with a discussion of future research efforts that may have the greatest impact on promoting the development of SMA composites and their implementation in multifunctional structures.
150 citations
TL;DR: In this paper, the active aeroelastic flutter analysis and vibration control at the flutter bounds of the supersonic composite laminated plates with the piezoelectric patches are studied.
113 citations