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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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International Journal of Safety
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Journal DOI :
The Korean Society Safety
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Volume & Issues
Volume 2, Issue 1 - Jun 2003
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A Study on Mixed Mode Crack Initiation under Static Loading Condition
Koo, Jea-Mean ;
International Journal of Safety, volume 2, issue 1, 2003, Pages 1~6
In this paper, several different fracture criteria using the Eftis and Subramanian's stress solutions  are compared with the printed experimental results under different loading conditions. The analytical results of using the solution with non-singular term show better than without non-singular in comparison with the experimental data. And maximum tangential stress criterion (MTS) and maximum tangential strain energy density criterion (MTSE) can get useful results for several loading conditions.
A Numerical Study on Methane-Air Counterflow Diffusion Flames Part 1. Concentration of Fuel
Park, Woe-Chul ;
International Journal of Safety, volume 2, issue 1, 2003, Pages 7~11
Structure of the counterflow nonpremixed flames were investigated by using Fire Dynamics Simulator(FDS) and OPPDIF to evaluate FDS for simulations of the diffusion flame. FDS, employed a mixture fraction formulation, were applied to the diluted axisymmetric methane-air nonpremixed counterflow flames. Fuel concentration in the mixture of methane and nitrogen was considered as a numerical parameter in the range from 20% to 100% increasing by 10% by volume at the global strain rates of
respectively. In all the computations, the gravity was set to zero since OPPDIF is not able to compute the buoyancy effects. It was shown by the axisymmetric simulation of the flames with FDS that increasing fuel concentration increases the flame thickness and decreases the flame radius. The centerline temperature and axial velocity, and the peek flame temperature showed good agreement between the both methods.
A Numerical Study on Methane-Air Counterflow Diffusion Flames Part 2. Global Strain Rate
Park, Woe Chul ;
International Journal of Safety, volume 2, issue 1, 2003, Pages 12~16
In Part 1, the flame structure of the counterflow nonpremixed flames computed by using Fire Dynamics Simulator was compared with that of OPPDIF for different concentrations of methane in the fuel stream. In this study, comparisons were made for the global strain rate that is an important parameter for diffusion flames for further evaluation of FDS. At each of the three fuel concentrations,
in the fuel stream, the temperature and axial velocity profiles were investigated for the global strain rate in the range from 20 to
. Changes in flame thickness and radius were also compared with OPPDIF. There was good agreement in the temperature and axial velocity profiles between the axisymmetric simulations and the one-dimensional computations except for the regions where the flame temperature reach its peak and the axial velocity rapidly changes. The simulations of the axisymmetric flames with FDS showed that the flame thickness decreases and the flame radius increases with increasing global strain rate.
Analysis of Three Dimensional Crack Growth by Using the Symmetric Galerkin Boundary Element Method
Kim, Tae-Soon ; Park, Jai-Hak ;
International Journal of Safety, volume 2, issue 1, 2003, Pages 17~22
In order to analyze general three dimensional cracks in an infinite body, the symmetric Galerkin boundary element method formulated by Li and Mear is used. A crack is modelled as distribution of displacement discontinuities, and the governing equation is formulated as singularity-reduced integral equations. With the proposed method several example problems for three dimensional cracks in an infinite solid, as well as their growth under fatigue, are solved and the accuracy and efficiency of the method are demonstrated.
Numerical and Experimental Evaluation of Tensile Failure in Continuous Fiber Reinforced Ceramic Composite
Kwon, Oh Heon ; Park, Keyoung Dong ; Watanabe, Katsuhiko ;
International Journal of Safety, volume 2, issue 1, 2003, Pages 23~27
Recently, continuous fiber reinforced ceramic composite(CFCC) has attracted attention to a number of engineers because of its significant benefit for several industrial area. This work was conducted to provide a basic characteristic of CFCC for tensile loading condition. The numerical analysis by general purpose finite element program was accomplished and compared with an experimental tensile test. The stress strain curves were expressed well by the numerical analysis and the first matrix cracking stress was in accordance with that of the experimental result. Moreover, fracture pattern was shown by kill command graphically.
Thermal Decomposition Characteristics of Ethyl Methacrylate and Styrene Copolymer
Kwon, Jae Beom ; Lee, Nae Woo ; Kim, Nam Seok ; Park, Keun Hok ; Seul, Soo Duk ;
International Journal of Safety, volume 2, issue 1, 2003, Pages 28~33
Thermal decomposition characteristics of ethyl methacrylate (EMA) and Styrene (St.) copolymer was investigated with synthesis at 8
in a continuous stirred tank reacto (CSTR) using toluene and benzoyl peroxide(BPO) as solvent and initiator, respectively. The thermal decomposition was considered to be side scission at below 30
and estimated 2nd-order reaction kinetics of EMA/St. copolymer. The activation energies of decomposition on this copolymers were in the ranges of 38-43 kcal/mol for EMA/St. and a good additivity rule was observed in each composition. The thermogravimetric trace curves agreed well with the theoretical calculation.
The Flash Points of the Butylacetate+2-Propanol System Measured By Air Blowing Tester
Ha, Dong Myeong ; Lee, Sung Jin ; Mok, Yun Soo ; Choi, Jae Wook ;
International Journal of Safety, volume 2, issue 1, 2003, Pages 34~38
The lower and upper flash points of the flammable binary system, butylacetate+2-propanol were measured by air blowing tester. The shape of the concentration-temperature region of flash depended on the components of the mixture in solution. The experimental data were compared with the values calculated by the reduced model under an ideal solution assumption and the flash point-prediction models based on Van Laar equation. Good qualitative agreement was obtained with these models. The prediction results of these models can thus be applied to incorporate inherently safer design for chemical process, such as the determination of the safe storage conditions for flammable solutions.
Application of the Boundary Element Method to Finite Deflection of Elastic Bending Plates
Kim, Chi Kyung ;
International Journal of Safety, volume 2, issue 1, 2003, Pages 39~44
The present study deals with an approximate integral equation approach to finite deflection of elastic plates with arbitrary plane form. An integral formulation leads to a system of boundary integral equations involving values of deflection, slope, bending moment and transverse shear force along the edge. The basic principles of the development of boundary element technique are reviewed. A computer program for solving for stresses and deflections in a isotropic, homogeneous, linear and elastic bending plate is developed. The fundamental solution of deflection and moment is employed in this program. The deflections and moments are assumed constant within the quadrilateral element. Numerical solutions for sample problems, obtained by the direct boundary element method, are presented and results are compared with known solutions.
An Empirical Analysis of the Industrial Accident Factors Affecting Manufacturing Performance in Korea
Park, Hai Chun ; Kim, Jong Rae ;
International Journal of Safety, volume 2, issue 1, 2003, Pages 45~49
In this paper, we investigated the relationship between the variables of the industrial accident factors and the manufacturing performances such as production quantity, quality, cost, and delivery. For this investigation, we collected the real data from 30 small/medium-sized manufacturing industries by performing a questionnaire survey and a on-site inter-view with the workers. Thirty industries were made up of 10 from each of the following three industries: metal processing, machinery manufacturing, and chemical products manufacturing. The data analysis was made using SPSS PC+. Based on the result of the analysis, we came to the tentative conclusion that only two variables such as work skill and load affected all four manufacturing performances and the rest of them two or three performances.
Severe Accident Management Using PSA Event Tree Technology
Choi, Young ; Jeong, Kwang Sub ; Park, SooYong ;
International Journal of Safety, volume 2, issue 1, 2003, Pages 50~56
There are a lot of uncertainties in the severe accident phenomena and scenarios in nuclear power plants (NPPs) and one of the major issues for severe accident management is the reduction of these uncertainties. The severe accident management aid system using Probabilistic Safety Assessments (PSA) technology is developed for the management staff in order to reduce the uncertainties. The developed system includes the graphical display for plant and equipment status, previous research results by a knowledge-base technique, and the expected plant behavior using PSA. The plant model used in this paper is oriented to identify plant response and vulnerabilities via analyzing the quantified results, and to set up a framework for an accident management program based on these analysis results. Therefore the developed system may playa central role of information source for decision-making for severe accident management, and will be used as a training tool for severe accident management.