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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society of Safety
Journal Basic Information
Journal DOI :
The Korean Society Safety
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Volume & Issues
Volume 5, Issue 3 - Dec 1990
Volume 5, Issue 2 - Oct 1990
Volume 5, Issue 1 - Jun 1990
Selecting the target year
Smouldering Combustion of Combustible Natural Polymer Dust Layer
Journal of the Korean Society of Safety , volume 5, issue 1, 1990, Pages 7~18
This study measured the smouldering temperature of dust layer for various combustible natural polymer material by practical apparatus. The dust layer was either put on the preheated plate of constant temperature, or formed with cylinderical metal sleeve of various diameters and depths at room temperature and then heated up to a pre-determined smouldering temperature. Plots of arrival times versus smouldering temperature were made to compare the smouldering characteristics with kinds of dusts. The natural polymer material was divided into theree groups by characteristics of smouldering mechanism. This groups are cellulose group, lipide group and glucose group.
A Study on the Fatigue Crack Growth Behavior in Welding Residual Stress Field(I)
Journal of the Korean Society of Safety , volume 5, issue 1, 1990, Pages 19~29
The objective of this paper is to investigate the effect of residual stresses on the
th/ and fatigue crack growth behavior of butt weldments. For this purpose, transverse butt sutmerged arc welding was performed on SM50A steel plate and CT(compact tension) specimens which loading direction is perpendicular to weld bead were selected. Welding residual stresses distribution on the specimen was determined by hole drilling method. The case of crack located parallel to weld bead, the states of as weld and PWHT,
th/ of specimens(HAZ, weld zone) was higher than that of the base metal probably because of the compressive residual stresses of crack tip. In low
K region, it is estimated that the effects of residual stresses for da/dN are great. In region II, the da/dN of weldments in as weld state was lower than that of the base metal. Though da/dN of Weldments in PWHT state was similar to that of the base metal. The constant of power law, m in two states consisted with the base metal. Therefore , it is estimated that the value of m is not affected by residual stresses. Fatigue crack growth behavior of weldments consisted with the base metal considering the effective stress intensity factor range(
eff/) included the effect of initial residual stress(Kres). Thus, we can predict the fatigue crack growth behavior of weldment by knowing the distribution of initial residual stress at the crack tip.
Influence of Operating Condition on Grinding Temperature in High Effect Grinding
Journal of the Korean Society of Safety , volume 5, issue 1, 1990, Pages 31~39
In this paper, the influence of the table speed, metal removal rate and grinding fluid on long wheel workpiece contact zone at high effect grinding was investigated by theoretical analyses and measuring the temperature, and discussed by the temperature distribution in grinding surface layer. Main results obtained are as follows, 1) Rega.dless of the table speed, the temperature gap of the workpiece(heat influx) is about 6-8 times as high in dry condition as in wet condition. 2) Good grinding condition can be obtained owing to the effect of grinding fluid without any burning defect under the condition of the metal removal rate(1.0mm
/mm.s) in case of wet grinding. 3) When the depth from the surface layer is about 1.25-1.5mm under the condition of the slow table speed, surface temperature goes up higher as the table speed slows down, because long contact time is laked at the surface layer. 4) In case of the same metal removal rate, the lower the table speed becomes, the higher the surface temperature is, because grinding depth has a far more influence on wheel workpiece contact zone than the table speed.
An Experimental Study on Explosion Characteristics of Terephtalic Acid
Journal of the Korean Society of Safety , volume 5, issue 1, 1990, Pages 41~48
In this study the explosion characteristics of terephtalic acid dust(PTA) was investigated with the Hartmann type apparatus. The minimum ignition energy, minimum explosible concentration, flame propagation velocity, explosion pressure, explosion pressure rise rate and the effect of inert dust(talcum) on explosion characteristics were measured. Flame velocity was 50m/s at 700g/m
concentration, and the explosion pressure and explosion pressure rise rate were most likely with that of gas explosion. It was found that an inert dust acts as a heat sinker and it disturbs the combustion of flammable dust, as a result, explosion pressure and explosion pressure rise rate were decreased and minimum explosion concentration was increased with increasing the fraction of talcum dust in PTA.
A Study of Performance Prediction for 4-stroke Gasoline Engine
Journal of the Korean Society of Safety , volume 5, issue 1, 1990, Pages 49~55
A comprehensive cycle simulation was developed to predict the performance of gasoline engine including intake and exhaust systems with variation of operating conditions and design factors. In this study, the gas exchange model, compression and expansion model, two-zone combustion model and heat transfer model were used. In order to confirm the feasibility of the simulation program, the calculated results were compared with experimental results. P-
diagrams, I. M. E. P. and S. F. C by means of calculation showed acceptable quantitative agreement with the experimental data. Therefore, this program is particularly well adapted to indicating the direction of the optimal design and optimal operating conditions for gasoline engine.
A Study on the Antistatic characteristics of Antistatic Garments for the Prevention of Static Electricity Hazards
Journal of the Korean Society of Safety , volume 5, issue 1, 1990, Pages 57~66
The purpose of this study is to investigate electrostatic charge condition and possibility of electrostatic hazards in case of putting on synthetic smocks and antistatic garments for the purpose of prevention of electrostatic hazards due to a human body electrical charge. It is shown in case of a synthetic smocks, electrostatic voltage by friction is about 2,900 (V), half life period is 12 second, and electrostatic charge is 1.4―1.8 (
C). When putting on a synthetic smocks, electrostatic voltage is 2,500―2,800(V). When putting on a jumper of chemical fiber, electrostatic voltage is 8,000(V) . It is, therfore, possible to cause a electrostatic hazards. It is also shown in case of a antistatic garments, electrostatic voltage by friction is 87(V) ―280(V) (washing 90 times), half life period is 3―5 second, and electrostatic charge is 0.24―0.28(
C) which is much lower than 0.6(
C) limitation of fire and explosion occurance. When putting on a antistatic garments, electrostatic voltage is 10(V) ―125(V). In conclusion, it is shown when putting on a antistatic garments it is possible to prevent a electrostatic hazards such as fire or explosion due to human body, to prevent a destruction of semiconductor elements and capacity decline, and to prevent a misoperation of automation facilities and semiconductor electric and electronic products.
Safety Program in Chemical Industry
Journal of the Korean Society of Safety , volume 5, issue 1, 1990, Pages 67~76
This research was to describe the organizational safety climate, to examine its implication, and to improve the strategies of industrial accident prevention in chemical industry in Korea. The subjects were 207 directors of department of safety in chemical industry, asked to respond questionnaire sent by mailing. The data in this research were analyzed by SPSS PC＋. The results were as follows ： 1) 24.2％ of surveyed chemical industry had department of safety. 2) 53.6％ of suueyed chemical industry had safety education program. 3) 53％ of employees in surveyed chemical industry were satisfied with supply of personal protective equipments.
A Study on Fire Profection and Egress Countermeasure of the High Buildings in the Large City
Journal of the Korean Society of Safety , volume 5, issue 1, 1990, Pages 77~81
In the event of fire, the tendency of overbuildings and highbuilding resulted from the concentration in population in cities causes great losses of human lives and property. Man is able to prevent fire itself from taking place on his own efforts. One of fire preventions at highbuildings is to Survey the environmental situations around the constructions from the beginning, and when the construction is going on, it is indispensable to install appropriate waterproof dampers with all sorts of equipments. Hence, lots of the owner's investment of the buildings in fire prevention facilities is necessary and, so is constructions in agreement with every regulations.