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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Ocean Engineering and Technology
Journal Basic Information
Journal DOI :
Korean Society of Ocean Engineers
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Volume & Issues
Volume 14, Issue 4 - Nov 2000
Volume 14, Issue 3 - Aug 2000
Volume 14, Issue 2 - May 2000
Volume 14, Issue 1 - Feb 2000
Volume 3, Issue 1 - 00 2000
Selecting the target year
A Numerical Study on 2-Dimensuional Tank with Shallow Draft
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 1~5
A numerical analysis for wave motion in the shallow water is presented. The method is based on potential theory. The fully nonlinear free surface boundary condition is assumed in an inner domain and this solution is matched along an assumed common boundary to a linear solution in outer domain. In two-dimensional problem Cauchy's integral theorem is applied to calculate the complex potential and its time derivative along boundary.
A Study on the Determination of Wave Load Acting on Offshore Structures
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 6~10
In this paper various methods of determining of wave loads acting ofshore structures including impact load due to breaking wave are studied and corresponding model test was performed. In the theoretical approach wave load by nonbreaking wave and impact load by breaking wave is determined by Morrison's equation Goda's equation and impact wave equation, In the experimental approach wave load by nonbreaking wave acting on cylindrical pile used in offshore structures is determined by measuring the strain on a cylindrical pile and compared with theoretical calue. in the numerical approach impact load by breaking wave acting on a modeled cylindrical pile is calculated by usign ANSYS FEM program and compared with theoretical value. It is found that the experimental and numerical results are comparable to theoretical results, Thus the determination of wave load acting on offshore structures can be obtained by a proposed methods and it acceptable.
Computation of Two-Fluid Flows by Finite Volume Method and Discussion on Wave Breaking
Milovan Peric ;
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 11~16
Calculation of 4 Crane Lifting Forces for a Sunken Ship
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 17~22
This study focuses on a simple analytical approach to calculate crane lifting forces for a sunken ship. The method takes into account the relation of lifting forces acting in wire rope slings to the inclination of the vessel including the effect of lug positions. The importance of the sunken ship salvage is explained from the statistics of ship casualties during last 15 years. Euler angles are introduced to represent the inclination of a sunken ship in developing the static force and moment equations,. Three dimensional examples with one redundant degree of freedom for a GT1500 oil tanker are analyzed and the results show that the information obtained by the method could be useful to salvors to conduct salvage work.
Fatigue Crack Growth Behavior of Membrane Material for LNG Storage Tank at Low Temperatures
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 23~28
The fatigue crack growth behavior of the cold-rolled STS 304 steel developed for membrane material of LNG storage tank was examined experimentally at 293K, 153K and 111K. The fatigue crack growth rate(do/dN) tends to increase as the stress ratio (R) increases over the testing temperature when compared at the same stress intensity factor range(
K). The effect of R on do/dN is more explicit at low temperatures than at room temperature. The resistance of fatigue crack growth at low temperatures is higher compared with that at room temperature which is attributed to the extent of strain-induced martensitic transformation at the crack tip. The temperature dependence of fatigue crack growth resistance is gradually vanished with an increase in
K which correlates with a decreasing fracture toughness with decreasing temperature. Fractographic examinations reveal that the differences of the fatigue crack growth characteristics between room and low temperature are mainly explained by the crack closure and the strengthening due to the martensitic transformation.
A Study on the Analysis of Cycle Ratio Using Fractal Dimension in Al 2024-T3
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 29~36
Surface micro-crack grows along intergranular or transgranular region of crystal grains. But if it meets the barrier such as sessile dislocation and precipitates it loses straightness and deflects. Investigators had many difficulties in estimating fatigue life of smooth specimen because of the random distribution growth and coalescence of surface micro-cracks. The path of surface micro-crack has irregularity due to nonhomogeneous microstructure. Euclidian geometry can't quantify the shape of surface micro-crack but fractal geometry can. Therefore in this paper fractal dimension is measured at various stage of cycle ratio and estimated cycle ratio in 2024-T3 aluminium, alloy.
Preparation of Lead Titanate Powders from Oxalates
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 37~43
was prepared by addition of lead-tltanium mixed aqueous solution to an ethanol solution of oxalic acid. The influence of various ripening factors was invesigated. On the basis of the results in the mono-component system we studied the foramtion of
phase with various ripening conditions. The
phase formation was accelerated with the ripening time temperature and ultrasonic irradiation.
A study on the Relations Between Fracture Strain and Fracture Resistance Curve of nuclear Pressure Vessel Steel
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 44~51
Safety and integrity are required for reactor pressure vessels because they are operated in high temperature. There are single specimen method multiple specimen method and load ratio analysis method which used as evaluation of safety and integrity for reactor pressure vessels. In this study the fracture resistance curve(J-R curve) elastic-plastic fracture toughness(
) and material tearing modulus (
) of SA 508 class 3 alloy steel used as reactor pressure vessel steel are measured and evaluated at room temperature 20
according to unloading compliance method and load ration analysis method. And then the comparison with experimental
by local fracture strain is managed.
Flexural Behavior of Reinforced Concrete Beams Strengthened with Grid-typs Carbon Fiber Plastics
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 52~59
Flexural fracture characteristics of newly-developed Grid-type carbon fiber plastics in the deteriorated reinforced concrete structures were investigated by the four-points fracture test to verify the strengthening effects in the beam specimens. Results showed that initial cracks appeared in the boundary layers of fibers embedded in the newly-placed mortar concrete slowly progressed to the direction of supports and showed fracture of fiber plastics and brittle failure of concrete in compression in sequence after the yielding of steel reinforcement. Accordingly the reasonable area of Grid-type carbon-fiber plastics in the strengthening design of deteriorated RC structures should be limited and given based on the ultimate strength design method to avoid the brittle failure of concrete structures.
The Study on the Behavior of Polarization curve of Reinforcement with Oxidation Layer
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 60~66
In order to study for corrosion behavior of reinforcing steel with oxidation layer. Experiments were done with various NaCl concentrations and with immersion time in simulated concrete pore solution(SPS) the characteristics of corrosion behavior were measured by polarization resistance method and cyclic potentiodynamic method. reinforcements were coated by epoxy except corrosion without oxidation layer and it also showed two anodic-nose. by the result of potention dynamic test the potential curve shift to low with time and anodic-nose was appeared with 3% NaCl solution after 15 days. By result of cyclic Potentiodynamic test the type of corrosion was different accoding to concentration.
Dynamic behavior of moving Elastic Body System on Simple Beam with Axial Load
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 67~73
The dynamic behavior of a moving elastic body system with three constant velocitics on a simple beam with an axial load is analyzed by numerical method. A moving elastic body system is composed of an elastic body and a suspension unit with two unsprung masses. The governing equations are derived with an aid of Lagrange's equation. These equation are solved by Runge-Kutta method. The damping coefficients a spring constants of the suspension unit the force circular frequency on a moving elastic body the velocity of a moving elastic body system. These effects are more important in the high modes of a simple beam.
A Study on the Recycling of Coal Ash as Structural Backfill materials
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 74~79
The purpose of this paper is to recycle coal ash as structural backfill materials from electric power plants. Two million tons of coal ash are produced annually. The laboratory test was executed for the basic compatibility as substitution for structural backfill materials and the optimal mixture ratio(fly ash : bottom ash) was decided. In addition the model test was performed using medium scale earth pressure model with small size earth pressure cells model box data logger and some other apparatuses. Mixed coal ash and excellent backfill materials(coheisonless soil SW) were compared in the view of lateral earth pressure variation depending on wall displacement. The reduction of earth pressure when coal ash was used as a bockfill material was monitored comparing to that of cohesionless soil. the cost and environmental pollutants by treating coal ash can be reduced through developing the recycling technology.
Pattern Recognition of modal Sensitivity for Structural Damage Identification of Truss Structure
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 80~87
Despite many combined research efforts outstanding needs exist to develop robust safety-estimation methods for large complex structures. This paper presents a practical damage identification scheme which can be applied to truss structures using only limited modal responses. firstly a theory of pattern recognition (PR) is described. Secondly existing damage-detection algorithms are outlined and a newly-derived algorithms for truss structures. Finally the feasibility of the proposed scheme is evaluated using numerical examples of plane truss structures.
A Numerical Analysis Study on the Reheating crack around Welded Joint of Pressure Vessel with 2
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 88~94
Recently various pressure vessels like an atomic reactor and plant facilities become more larger and are needed to bear in both very high temperature and pressure condition. And in making such a high pressure vessels the amount of annual usage of 2
Cr-1Mo steels which are predominant to resist high temperature high pressure and corrosive circumstances are increasing. But despite of this advantage of 2
Cr-1Mo steel. when PWHT(post welding heat treatment) is carried out lots of reheating cracks are occur. In this reason it is strongly needed to study and examine the mechanical behavior of welded joints through welding to PWHT process. So in this study welded nozzle of pressure vessel where reheat cracks are frequently occur are selected for analysis the crack-occurrence mechanism.
A Study on the Generation of Ship Hull Lines Using NURBS Method
Journal of Ocean Engineering and Technology, volume 14, issue 1, 2000, Pages 95~101
In general, free form design depends on B-spline which is used for the generating hull lines in most of shipyards. But, nowadays, the NURBS method is applied to free form modeling method, which is able to more flexible transformation than B-Spline, and then became industrial standard in the various field. Therefore, this method has been considerably applied in new application fields which are required free form modelling. In this paper, the program called 2DSURF with 5 modules and developed for the generation of hull lines is described. It is examined whether the program can be applied to body lines, sheer lines, and half breadth lines.