Jong Keun Moon¹, Jong Bum Kim, Sang Min Kim, Kuk Jin Park Chae Kyu Jang, Seung Jo Kim²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.2, pp. 49-51, 2009, DOI:10.3970/icces.2009.012.049

Abstract As a finite element structural analysis tool, IPSAP has been developed over a decade ago by ASTL(Aerospace STructures Laboratory in Seoul National University) since early 1990's. IPSAP means 'Internet Parallel Structural Analysis Program' and is able to solve linear static analysis, thermal conduction analysis, and vibration analysis of various types of general complex structures.
By using Parallel Multi-Frontal solver, IPSAP shows efficient, powerful performance and accuracy in serial and parallel computing system and has been released by website(http://ipsap.snu.ac.kr) since 2004. But initial version of IPSAP did not support GUI(Graphic User Interface). To get over this inconvenience of IPSAP, the pre/post… More >

M. Sokabe^1,2,3, Sawada Y¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.2, pp. 47-48, 2009, DOI:10.3970/icces.2009.012.047

Abstract Mechanosensing is ubiquitous in our body. Not only specialized mechanoreceptors like inner ear hair cells and visceral baroreceptors, but also ordinary cells can respond to mechanical stimuli, by which cells can regulate their volume, shape and motility properly. The major biophysical issue in this field is to understand the physicochemical mechanisms of mechanotransduction based on the molecular structure of mechanosensors. To date the mechanosesnitive (MS) ion channel is the only identified molecular class of mechanosensors. Among them the bacterial MS channel MscL is the best studied one owing to the resolved 3D structure of its closed state. MscL forms a… More >

Dong-Chan Lee¹, Woo-Sung Jung, Duck-Hee Lee, Yong-Jun Jang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.2, pp. 45-46, 2009, DOI:10.3970/icces.2009.012.045

Abstract Computational Fluid Dynamics (CFD) was carried out to analyze pool-fire suppression in rolling stock for two cases. One is single-pool fire simulation in which fire is located in center of rolling stock, the other is multi-pool fire simulation in which fires are located 4.8m from center of, respectively. Six water mist nozzles are installed and equally spaced along rolling stock for each case. It is assumed that pool fire is volume constant heat source, 50kW, for each case. This analysis was performed using DPM (Discrete Phase Model) from Fluent, a commercial CFD code. More >

Raimund Rolfes, Matthias Vogler, Benedikt Kriegesmann¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.2, pp. 43-44, 2009, DOI:10.3970/icces.2009.012.043

Abstract Fiber composite structures are usually thin-walled and hence, prone to buckling. Thus, beside material failure also stability problems have to be considered.

Thin-walled cylindrical composite shells buckle in the elastic region and thus, there is no need to consider material non-linearities or material failure. Never the less, a robust design guide for composite shells does not exist until today. The most frequently guideline is NASA SP-8007, which gives an empirical based knockdown factor. Because this guideline is not intended for composite shells and it turned out to be very conservative in numerous cases several approaches have been developed to… More >

Joong-Jin Kim, Jin-Hwe Kweon¹, Jin-Ho Choi, Jong-Su Han

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.2, pp. 41-42, 2009, DOI:10.3970/icces.2009.012.041

Abstract Target-drone is an unmanned remotely controlled aerial vehicle and usually used for shooting training for anti-aircraft screws. Traditional target-drones have been generally manufactured from aluminum and/or wood. Recently, composite materials have been replacing them in virtue of their high strength-to-weight and stiffness-to-weight ratios. In particular, glass fiber-based composite materials are popular for the target-drone level vehicles because of the material cost and fabrication convenience.
In this paper, as a part of the development activities for a complete target-drone vehicle, the stress analysis results are presented for a 685cc engine target-drone composite aerial vehicle wing. Composite materials used are H612 and… More >

Yong-bin Park¹, Jin-Hwe Kweon¹, Jin-Ho Choi¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.2, pp. 39-40, 2009, DOI:10.3970/icces.2009.012.039

Abstract This paper addresses experimental results on the strength of single-lap composite bonded joints with different manufacturing methods and configurations. The joints were fabricated with 4 different methods; Co-curing with additional adhesive (CCA) and without additional adhesive (CCN) between composite adherends, Co-bonding (COB) and secondary bonding (SEB). Joints have 5 different overlap lengths(l), 3 different lay-up patterns and 4 different thicknesses(t), respectively. Width of the joints(w) is constant at 25.4 mm. A total of 389 single-lap specimens were tested in tension. In the test to examine the effect of manufacturing methods and overlap lengths, the joint CCN showed the highest failure… More >

L. Donati, L. Tomesani

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.1, pp. 37-38, 2009, DOI:10.3970/icces.2009.012.037

Abstract In recent years aluminum extruded hollow profiles are increasingly used in near-net shape manufacturing processes such as bending and hydroforming; in fact, by applying these secondary processes, it is possible to obtain very high complex parts, especially for the transport industry. It is known that hollow profiles obtained by direct hot extrusion necessarily have some longitudinal welding lines (so called seam welds) produced inside the die and it is common experience, during secondary forming processes, the appearance of early cracking in proximity of those lines [1,2]. At the same time, the direct hot extrusion is the only process able to… More >

J. Sladek¹, V. Sladek¹, P. Solek²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.1, pp. 35-36, 2009, DOI:10.3970/icces.2009.012.035

Abstract Functionally graded materials are multi-phase materials with the phase volume fractions varying gradually in space, in a pre-determined profile. This results in continuously graded mechanical properties at the (macroscopic) structural scale. Often, these spatial gradients in material behaviour render FGMs as superior to conventional composites. FGMs possess some advantages over conventional composites because of their continuously graded structures and properties. Due to the high mathematical complexity of the initial-boundary value problems, analytical approaches for elastic analyses of FGMs are restricted to simple geometries and boundary conditions. The elastic analysis in FGM demands an accurate and efficient numerical method.
In spite… More >

Jr-Ming Miao^1,2, Fuh-Lin Lih³, Yi-Chun Liou⁴, Hsiu-Kai Chen¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.1, pp. 33-34, 2009, DOI:10.3970/icces.2009.012.033

Abstract To date, miniaturization of fluid handling and fluid analysis devices in the medicine engineering has been emerging in the interdisciplinary research field of micro-fluidics, as a result of miniaturization of the detective device to allow parallelization as well as to reduce analysis time and sample volume. Micro-total-analysis-system (μ -TAS) researches aimed at developing miniaturized and integrated ``lab-on-a-chip'' devices for biochemical analysis applications. Droplet-based micro-mixer is the one of the key components in the developing of μ-TAS. Numerical approach on the dynamic formation of water droplets in a T-type microchannel with a 200μm × 50μm rectangular cross section and 1000μm long… More >

Ch.Raghuveer¹, Mohit Pant¹, I.V. Singh¹, B.K. Mishra¹, V. Bhasin², Kamal Sharma², I.A. Khan²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.1, pp. 23-32, 2009, DOI:10.3970/icces.2009.012.023

Abstract In this work, element free Galerkin method (EFGM) has been applied to solve solid mechanics problems containing material discontinuities. The method is based on treatment of interface conditions at the variational level. Modifications are made in the EFGM to incorporate material discontinuities, which include the variational form of the governing differential equations. Two bi-material problems i.e. beam and bar has been solved using EFGM, and a clear discontinuity in the stress field has been observed at the interface of two materials. More >