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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Safety
Journal Basic Information
Journal DOI :
The Korean Society Safety
Editor in Chief :
Volume & Issues
Volume 19, Issue 4 - Dec 2004
Volume 19, Issue 3 - Sep 2004
Volume 19, Issue 2 - Jun 2004
Volume 19, Issue 1 - Mar 2004
Selecting the target year
The Effect of Ageing on the Transformation Behavior of
Woo Heung-Sik ; Park Sung-Bum ; Kang Bong-Su ; Kim Sung-Jin ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 1~7
This study investigated the effects of aging on the transformation behavior of
Ni alloy by means of differential scanning calorimetry. It was found that aging in the temperature range of
induced complex transformation behavior, involving the R-phase and multiple-stage martensitic transformation. Usually aged Ni-rich NiTi alloys undergo martensitic transformation on cooling from high temperatures in two step : B2 to R and then R to Bl9'(normal behavior). But under certain ageing conditions, the transformation can also occur in three or more step(unusual multiple step behavior). In the present study we use differential seaming calorimetry(DSC) for a systematic investigation of the evolution of transformation behavior with ageing temperature and time.
A Study on the Residual Stress Distribution of Pure Titanium Welding Material
Choi Byung-ki ; Chang Kyung-chun ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 8~13
The purpose of this paper is to investigate the welding residual stress distribution according to the constraint or non-constraint welding condition with titanium commonly using power station, aircraft, and ship. The measuring method of the residual stress was applied stress release rating method with strain gages and a potable strain meter. The x direction residual stress generally showed the tensile residual stress in case of res03int welding. On the other hand, the x direction residual stress under non-restraint welding were changed tensile stress into compressive stress on 15mm away from welding bead center. Also, the y direction residual stress generally showed the tensile residual stress in case of non-restraint welding and the y direction residual stress under restraint welding were changed tensile stress into compressive stress about 60mm away from welding bead center.
Measures for Preventing Pressure Fracture of Fire and Flue Tube Boiler
Lee Keun-Oh ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 14~19
Boiler is a hazardous equipment to have potential explosion ail the time. And not only it has malfunction at explosion. it lead to people death but also secondary accident such as explosion and fire. Therefore, this equipment should not be broken for keeping its own function. And also, high level of safety should be kept in the process of the use not to be malfunctioned. A large scale of accident due to boiler explosion can be preventive in advance. Boiler fracture is occurred by instant expansion (approximately 1700 time) from quick evaporation of rater in boiler, due to pressure decrease in boiler Emitting energy from it is tremendous and it is so dangerous because of its high temperature. Secondary explosion such as fire is also a main hazard occurring at fuel supply place. If any devices with high pressure is broken, then not only boiler vessel but also components of it are spread with high speed, causing secondary accident. This study is to analyze integrally accident cause of fire and flue tube boiler to have occurred pressure fracture actually, to show countermeasures to prevent accident loss from the fire and flue tube boiler.
A Study of Fatigue Crack Growth in Shot Peened Spring Steel
Park, Keyung-Dong ; Jin, Young-Beom ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 20~24
Antifatigue failure technology take an important the part of current industries. Currently, the shot peening is used for removing the defect from the surface of steel and improving the fatigue strength on surface. Therefore in this paper the effect of compressive residual stress by shot peening on fatigue crack growth characteristics in stress ratio(R=0.1, 0.3, 0.6)was investigated with considering fracture mechanics. There is difference between shot peening specimen and unpeening specimen. Fatigue crack growth rate of shot peening specimen was lower than that of unpeening specimen. Fatigue lift shows more improvement in the shot peening material than in the unpeening material. And compressive residual stress of surface on the shot peening processed operate resistance force of fatigue crack propagation. That is the constrained force about plasticity deformation was strengthened by resultant stress, which resulted from plasticity deformation and compressive residual stress in the process of fatigue crack propagation.
Elastic-Plastic Stress Distributions Behavior in the Interface of SiC/Ti-15-3 MMC under Transverse Loading(I)
Kang Ji-Woong ; Kim Sang-Tae ; Kwon Oh-Heon ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 25~30
Unidirectional fiber-metal matrix composites have superior mechanical properties along the longitudinal direction. However, the applicability of continuous fiber reinforced MMCs is somewhat limited due to their relatively poor transverse properties. Therefore, the transverse properties of MMCs are significantly influenced by the properties of the fiber/matrix interface. In this study, the interfacial stress states of transversely loaded unidirectional fiber reinforced metal matrix composites investigated by using elastic-plastic finite element analysis. Different fiber volume fractions
were studied numerically. The interface was treated as thin layer (with different properties) with a finite thickness between the fiber and the matrix. The fiber is modeled as transversely isotropic linear-elastic, and the matrix as isotropic elastic-plastic material. The analyses were based on a two-dimensional generalized plane strain model of a cross-section of an unidirectional composite by the ANSYS finite element analysis code.
The Influence of Volume Fraction and Fiber Orientation of CERP Layer on Flexural properties of A17075/CFRP Multi-Layered Hybrid Laminate Material
Yoo Jae-hwan ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 31~35
The A17075/CFRP multi-layered hybrid laminate material consists of the alternating A17075-T6 sheets and carbon/epoxy prepregs of M40 fade. The influence of volume fraction and fiber orientation of A17075/CFRP layer on flexural properties of A17075/CFRP laminate alternating A17075-T6 and carbon/epoxy prepreg was investigated. The results obtained from the experimental analysis are as follows: 1. In the
fiber orientation, the mont of increase of the flexural rigidity was
volume fraction and
volume fraction compared with the flexural rigidity level(20.0GPa) of the
volume fraction of CFRP. 2. In the
fiber orientation the amount of decrease of the flexural rigidity was
volume fraction and
volume fraction compared with the flexural rigidity level of the
volume fraction of CFRP. 3. In the
fiber orientation, the flexural strength was 481.5MPa at the
volume fraction of CFRP and 583.8MPa at the
volume fraction and 653.7MPa at the
volume faction. 4. In the
fiber orientation, the flexural strength was 354.0MPa at the
volume fraction of CFRP and 340.5MPa at the
Qualitative Assessment for Hazard on the Electric Power Installations of a Construction Field using FMEA
Kim Doo-hyun ; Lee Jong-ho ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 36~41
This paper presents an qualitative assessment for hazard on the electric power installations of a construction field using FMEL The power installations have the mission to maintain the highest level of service reliability on the works. The more capital the electric power invest the higher service reliability they plausibly will achieve. However, because of limited resources, how effectively budgets can be allocated to achieve service reliability as high as possible. The assessment typically generates recommendations for increasing component reliability, thus improving the power installation safety. The FMEA tabulates the failure modes of components and how their failure affects the power installations being considered. Tn order to estimate the risks of a failures, the FMEA presents criticality estimation or risk priority number using the severity, occurrence, and detectability. The results showed that the highest components of the risk priority number among components were condenser, transformer, MCCB and LA. And In case of the criticality estimation, the potential failure modes were abnormal temperature rise, insulation oil leakage, deterioration for the transformer, overcurrent for the MCCB and operation outage fir the LA.
The Characteristics Analysis of Damaged Pattern by Repeated Stress of VCTFK
Choi Chung-Seog ; Shong Kil-Mok ; Kim Dong-Woo ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 42~47
In this paper, we analyzed on the characteristics of the stranded wire disconnected by repeated stress. The stranded wires that were used in the experiment are PVC insulated flexible cords(VCTFK: Vinyl Insulated Vinyl Cabtyre Cord Flat-type) of
. They are used to connect the load in low voltage. The stranded wires disconnected by repeated stress were magnified with optical microscope. Using X-ray, the disconnected wire were photo-graphed. we compared mechanical characteristics of the stranded wire between disconnected tendency and allowable current. On the mechanical strength of vinyl cap tire ellipse type cords under bending stress, VCTFK of
was the strongest of them. When it was bent
times, it appeared the disconnected tendency that element wires of VCTFK of
are more about 1.67 times than element wires of VCTFK of
. In mechanical strength, VCTFK of
is higher about 1.7 times than VCTFK of
. Therefore, we found out that mechanical strength was higher, when the wire had a lot of element wires. In comparison with bending stress, VCTFK of
is the strongest among samples, and it is the most useful in wires of movable type.
A Study on Toxicity Evaluation of Combustion Gases Released from the Residental Container Fire - Efficiency Test for the Fire Gas Mask Filters
Lee Jung Yun ; Kim Jeong Hun ; Kim Youn-Hi ; Jung Ki Chang ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 48~54
The recent Ire incident in an elementary school of Chonan city causes the media focus on the fire safety of residential container buildings. In this study, real fire tests were conducted in this kind of buildings. Combustion products including
were measured, and blood samples of lab rats were analyzed in terms of Co-Hb, Glucose, AST(GOT), ALT(GPT), in order to investigate the hazard-reduction effects of employing gas mask protected with filter during the fire emergency of residential container buildings. According to the test results, whether or not employing the filter showed a sheer difference in the toxicity of the fire-induced gases, and then the importance of wearing a gas mask was evidently demonstrated.
A Study on the Optimal Equipment Selection of Series Systems using Life Cycle Cost and Failure Cost
Jin Sang-Hwa ; Kim Yong-Ha ; Song Hee-Oeul ; Yeo Yeong-Koo ; Kim In-Won ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 55~59
In this study, the required life cycle cost is evaluated in consideration of the equipment's availability during its lift cycle. In order to meet the maximum availability required by the process, the failure cost and life cycle cost is assessed The optimal equipment selection method is presented according to the analysis of the failure cost and life cycle cost. For the systems in which equipments are connected serially, the optimal equipments are selected by minimizing the life cycle cost and satisfying the required system availability goal. In addition, the selection methods and lift cycle cost are analyzed according to the cost variation of the equipment. By using the life cycle evaluation procedure, the failure cost and maintenance cost needed during the life cycle of the equipment can be presented.
Consequence Analysis of flammable Materials at Risk Based Inspection using API-581
Lee Hern-Chang ; Ryoo Jun ; Kim Hwan-Joo ; Jang Seo-Il ; Kim Tae-Ok ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 60~68
Consequence analysis of flammable materials that affect to a risk of facilities was studied at the risk based inspection using API-581. We found that consequence areas (damage area of equipment and fatality area) by release accident of flammable materials showed high value for the case of liquid phase and auto-ignition likely, and that consequence areas of flammable gases decreased as temperature increased and the pipe diameter and pressure decreased at continuous release.
Measurement of Fire Point and Flash Point for Alcohols Using Tag Open-Cup Apparatus
Ha Dong-Myeong ; Lee Sung-Jin ; Song Young-Ho ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 69~73
The flash point is one of the most important combustible properties used to determine the potential for the fire and explosion hazards of industrial material and the fire point is the temperature of the flammable liquid at which there will be flaming combustion, sustained 5 seconds in response to the pilot flame. In this study, the flash point and fire point were measured to present raw data of the flammable risk assessment for alcohols, using Tag open-cup apparatus(ASTM D 1310-86). The measured values were compared with the calculated values based on 0.78 times stoichiometric concentration. The values calculated by the proposed equations were in good agreement with the measured values.
A Study on the Characteristics of
Catalysts for the Emergency Escape Mask Cartridge
Kim Deogki ; Kim Bokie ; Shin Chae-Ho ; Shin Changsub ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 74~79
] catalysts were reported high activity on the low temperature CO oxidation. The effects of the calcination temperature, the loaded amount of cobalt and the oxygen concentration on the characteristics of CO oxidation have been investigated for a emergency escape mask cartridge.
was used as cobalt precursor and the catalysts were prepared by incipient wetness impregnation. TGA shows that enough calcination is accomplished at
and cobalt phase is
after calcination in the temperature range of
. The specific surface area and pore volume of catalysts are decreased with increasing of loaded amount of cobalt. And with the increase of loaded amount of cobalt and the oxygen concentration, the catalytic activity is increased.
EMI Shielding Efficiency of Recycled plastic/Hybrid Conductive filer Composites filled Electro Arc furnace Slag
Kang Young-Goo ; Song Jong-Hyeok ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 80~85
Electromagnetic interference(EMI) shielding characteristics of composite filled with Cu flake and carbon brush powder as hybrid conductive filler and EAF slag have been studied. The coaxial transmission line method of ASTM D4935-99 was used to measure the EMI Shielding effectiveness of composites as formulation in frequency rage
The SE also increases with the increase in flier loading. The hybrid filler filled composites show higher SE compared to that of only Cu flake. The correlation between SE and conductivity of the various composites is also discussed. The results indicate that the composites having higher filler loading
can be used for the purpose of safety materials to protect hazardous electromagnetic interference.
A Study on the Application Instance of KOSHA 18001 to Construction Firms
Park, Kyung-Tea ; Son, Ki-Sang ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 86~93
Through this study we have reviewed the implementation model, certificate criteria and the formation of KOSHA 18001 Safety and Health Management System and have compared and examined with OHSAS 18001 Certificate. In the course of the 1st questionnaires which have been participated by the concerned Safety and Health Staffs(such as Project Mannager, Site Supervisior, Safety Engineers) of the local construction sites, actual condition of application for KOSHA 18001 has been scrutinized and examined. And as a result, we presented the improved model by digging out the problems. The improved model has been applied for about eight months in local construction sites and the effectiveness has been carefully compared and examined before and after the application of the improvement model through the 2nd questionnaires by the relevant staffs (such as Project Manager, Site Supervisor, Safety Engineer and Project Engineers of the Coordinated Sub-Contractors).
The Efficiency Analysis of the Safety Investment Cost in Construction Work
Park Jong-Keun ; Ro Min-Lae ; Yi Kwan-Hyung ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 94~100
This study delivers the actual condition of investment for industrial accident prevention based on survey of 500 construction sites from 'reports for industry safety and health' published by Korea Occupational Safety & Health Agency (KOSHA). The various research techniques were used such as technical statistic analysis for construction industry, cost comparison of industrial accident prevention and accident loss. A formula was deduced to calculate accident loss and accident frequency by accident prevention cost through regression analysis.
Analysis of Open Conical Shells with Stiffeners
Park Weon-Tae ; Choi Jae-Jin ; Son Byung-Jik ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 101~108
In this study, open conical shells with ring and stringers are analyzed A versatile 4-node shell element which is useful for the analysis of conical shell structures is used and 3-D beam element is used for stiffeners. An improved flat shell element is established by the combined use of the addition of non-conforming displacement modes and the substitute shear strain fields. The proposed element has six degrees of freedom per node and permits an easy connection to other types(beam element) of finite elements. Optimum location and optimum section properties of ring and stinger are obtained. It is shown thai the thickness of conical shell can be reduced about
by appropriate location of stiffeners.
Dynamic Analysis of Base-Isolated Rectangular Liquid Storage Structures
Park, Jang-Ho ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 109~116
The dynamic behavior of the rectangular liquid storage structure is known to be greatly influenced by fluid-structure interaction. By mounting the liquid storage structure on the properly designed base isolators, dynamic response of the superstructure can be reduced. However, base isolators inevitably incur large displacement of the structure to the ground ·ind may give adverse effects on the sloshing height. This paper presents the analysis method for fluid-structure-isolator interaction in base-isolated rectangular liquid storage structures. In the method, the irrotational motion of invicid and incompressible ideal fluid is expressed by analytic solutions and the superstructure and isolators are properly modeled by finite element and bilinear model. Free surface sloshing motion, hydrodynamic pressure acting on the wall and structural response are obtained by the presented method.
A Study of Pertinent Safety Investment Reckoning by Economic toss Analysis of Industry Calamity in Construction Work
Kim Youn-Hi ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 117~122
The investment for industrial disasters prevention can not help but get accomplished in negative way. At this point, the most effective way to diminish industrial disaster outbreak is the very subject should strive to prevent it by itself However, it's still the times that we place more weight on economic development no economic subject would not positively self-participate in it for the investment for industrial disasters prevention without my effect of numerical reduction. In this view, this study will tv to entirely analyze and grasp the economic toss due to industrial disasters at construction sites, and will present the most suitable safety-investment. As a result, in domestic construction sites, averagely
of the entire construction expenses had been invested for safety expense. The according to the result of the analysis, basically this safety investment expenses should be spent
over to reduce the saffey-accidents stably.
Psychophysical Stess Depending on Repetition of Wrist Motion and External Load
Kee, Do-Hyung ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 123~128
This study investigated effect of arm posture, repetition of wrist motion and external load on perceived discomfort. The arm postures were controlled by shoulder flexion, elbow flexion, and ist motions such as flexion, extension, radial deviation and ulnar deviation. An experiment was conducted to measure discomfort scores for experimental treatments using the magnitude estimation, in which the L16 orthogonal array was adopted for reducing the size of experiment. The results showed that while the effect of the shoulder flexion, repetition of wrist motion and external load was statistically significant at
or 0.10, that of the elbow and wrist motions was not. Discomfor ratings increased linearly as levels of wrist repetition and external load increased. This implies that the existing posture classification schemes such as OWAS, RULA, which do not properly consider effect of motion repetition and external load, may underestimate postural load. Based on the regression equation for wrist repetition and external load, isocomfort region indicating the region within which discomfort scores were expected to be the same was proposed. It is recommended that when assessing risk of postures or developing new posture classification schemes, motion repetition and external load as well as posture itself be fully taken into consideration for precisely evaluating postural stress.
Incentive Models of the Occupational Safely and Health Education System
Kang, Jong-Cheol ; Chang, Seong-Rok ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 129~134
Educational programs for promoting occupational safety and health have widely been established in advanced countries, such as United States and Germany, in the area of disaster prevention Focused attentions and investments for safety and health education have been placed especially for small and medium sized companies. Recently, information technologies have also been applied for the development and management of educational programs in those countries. It is also worth noting that a wide variety of incentive systems has been implemented for managers and workers to voluntarily Participate in safety and health education. Based on the brief survey on incentive systems in advanced countries, this study proposes two different incentive models, such as 'Supervision Exemption Model for Participants in Safety and Health Education' and 'Compensation Program fur Educational Expenses and Losses', which may efficiently be employed in Korea. These incentive models may contribute to revitalizing the occupational safety and health education which has recently been dwindled due to the changes in governmental regulations.
Fracture-mechanical Modeling of Tool Wear by Finite Element Analysis
Sur, Uk-Hwan ; Lee, Yeong-Seop ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 135~140
Wear mechanisms may be briefly classified by mechanical, chemical and thermal wear. A plane strain finite element method is used with a new material stress and temperature fields to simulate orthogonal machining with continuous chip formation. Deformation of the workpiece material is healed as elastic-viscoplastic with isotropic strain hardening and the numerical solution accounts for coupling between plastic deformation and the temperature field, including treatment of temperature-dependent material properties. Effect of the uncertainty in the constitutive model on the distributions of strait stress and temperature around the shear zone are presented, and the model is validated by comparing average values of the predicted stress, strain, and temperature at the shear zone with experimental results.
Partial Discharge Characteristics of Epoxy for Ignition Coil
Shin Jong-Yeol ; Hong Jin-Woong ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 141~149
The automobile equipped with a gasoline engine uses the ignition coil, namely, a high voltage generator, to make the mixed fuel ignited and burned in the combustion chamber, which results in the power to drive the engine. The ignition coil functions to convert a low voltage of the primary into a hiか voltage of the secondary by switching method, which will be transmitted to the electrode. Here, if the ignition coil has a defect even a little, it cannot function well. In this study, it was chosen epoxy molding ignition coil in recently and epoxy resin which is insulation material as specimens, and it was measured the characteristics of the partial discharge occurring to the specimens when those were applied to a voltage, and thereby, it was researched and analyzed the distribution of phase angle, amount and count of discharge due to the changing voltage, And as the result is applying to the actual automobile ignition system, it can be expected the enhancement of the performance of the ignition coil and the reliability of the electrical equipment.
A Study on the Transition of Hydrogen-Air and LPG-Air Explosion to Fire
Oh Kyu-Hyung ; Lee Sung-Eun ; Rhie Kwang-Won ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 150~154
Gas explosion characteristics of hydrogen and liquefied petroleum gas(LPG) were measured in 6L cylindrical vessel, and experiment for explosion to fire transition phenomena of the gases were carried out using the 270L vessel. Explosion characteristics were measured using the stain type pressure transducer and explosion to fire transition phenomena was analyzed with the hish-speed camera. Base on the experiment, it was found that explosion pressure was most high slightly above the stoichiometric concentration, and explosion pressure rise rate and flame propagation velocity were proportional to the combustion velocity. And we find that those kind of explosion characteristics affect the explosion-to-fire transition, in addition, explosion flame temperature, flame residence time, are important parameters in explosion-to-fire transition.
Numerical Analysis of Nonlinear Thermoelastic Stress for Rectangular Thin Plate
Kim Chi-Kyung ; Kim Sung-Jung ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 155~160
A simply supported rectangular thin plate with temperature distribution varying over the thickness is analyzed. Since the thermal deflections are large compared to the plate thickness during bending and membrane stresses are developed md as such a nonlinear stress analysis is necessary. For the geometrically nonlinear, large deflection behavior of the plate, the classical von Karman equations are used. These equations are solved numerically by using the finite difference method. An iterative technique is employed to solve these quasi-linear algebraic equations. The results obtained from the suggested method are presented and discussed.
Study on Stress Variation in Slab and Support of Shearwall-Type RC Apartment during Construction
Kim Young-Chan ;
Journal of the Korean Society of Safety , volume 19, issue 4, 2004, Pages 161~165
Safety and efficiency in the construction of RC structures mainly depends on optimal operation of shore-slat systems. The disasters in RC construction are mainly due to excessive load applied to falsework and premature removal of supports. Development of sufficient compressive strength of early-age connote is essential for the safety of structures during construction. Most of studies on shore-slab interaction have focused on flat slab structures. In this study, load distributions in floor slabs and supports during the construction of shear wall-type RC apartment building structures is investigated using finite element analysis.