[논문]선미 스케그 외판의 좌굴강도에 관한 연구

최경신; 설상석; 김진우; 공석환; 정원지

doi:10.14775/ksmpe.2021.20.01.080

선미 스케그 외판의 좌굴강도에 관한 연구
A Study on the Buckling Strength of Stern Skeg Shell Plate 원문보기

한국기계가공학회지 = Journal of the Korean Society of Manufacturing Process Engineers, v.20 no.1, 2021년, pp.80 - 87

최경신 (창원대학교 일반대학원 기계설계공학과) , 설상석 (창원대학교 일반대학원 기계설계공학과) , 김진우 (창원대학교 일반대학원 기계설계공학과) , 공석환 (창원대학교 일반대학원 기계설계공학과) , 정원지 (창원대학교 일반대학원 기계설계공학과)

Abstract ▼ AI-Helper

Most container ships are currently being constructed as Ultra-Large Container Ships. Hence, the equipment of the ships is also becoming relatively large. In particular, propellers, rudders, and rudder stocks are large in the stern structure, and in relation, efficient design of the hull structures to safely secure these parts is important. The bottom shell plate surface of a stern skeg is a perforated plate from which the rudder stock penetrates, so it is an important component for the stern structure. In this paper, to determine the critical buckling of the shell plate, an interaction curve equation for the two-axis compression of the shell plate was derived using the maximum value of the static structural stress multiplier in a load multiplier mode. This equation predicts the timing of the buckling occurrence. By analyzing this interaction curve equation, the buckling behavior of the plates subjected to a combination load was determined and the usefulness of applying it to ship building was investigated.

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문제 정의

Regarding the buckling behavior phenomenon, which is important among vessel design factors, this study aimed to identify the elastoplastic deformation behavior of the perforated plate in the nonlinear skeg bottom plate by setting the slenderness ratio, aspect ratio, and aspect ratio of the hole passing through the plate as design variables. It also aimed to reveal the usefulness of the elastoplastic deformation behavior applicable to actual vessels.
Furthermore, as the length of the plate exceeds 10m, the buckling factor was introduced, and the critical stress value was calculated as the boundary condition of the combined load subjected to simultaneous biaxial compression due to the characteristics of the structure applied in actual vessels. The analysis was performed on the assumption of elastic-perfectly plastic behavior of property materials.

가설 설정

2. According to the result obtained by the theoretical curve equation for the critical buckling stress regarding elastic buckling by biaxial compression, _ is 1386 MPa and _is 355 MPa. Considering 1404 MPa at the stress ratio the analysis, _3.

제안 방법

Thus, because it is difficult to determine the quantitative safety factor due to the design without considering the post-buckling behavior, or applying excessive thickness, designs have been created based on experience. Regarding the buckling behavior phenomenon, which is important among vessel design factors, this study aimed to identify the elastoplastic deformation behavior of the perforated plate in the nonlinear skeg bottom plate by setting the slenderness ratio, aspect ratio, and aspect ratio of the hole passing through the plate as design variables. It also aimed to reveal the usefulness of the elastoplastic deformation behavior applicable to actual vessels.
The thickness otherwise is set as 49mm. The analysis was conducted with the strongest rudder force of 9, 672kN among the possible resistances at the upper structure of the vessel’s stern. Fig.
Thus, the plate member constituting the structure is a continuous structure that is connected to other plate members in the structure. The coupling condition constraining the displacement in the in-plane direction is applied, and the analysis is performed to maintain all four sides straight with respect to the in-plane load. However, because the buckling calculation formula in each class is composed of only a function of the size of the perforated plate and the plate’s aspect ratio tends to be evaluated higher than the actual final strength, the structures in actual vessels are often subjected to complex compression of two or more axes and buckling of simple support plates.
This study first identified the elastic buckling phenomenon due to the biaxial compressive load of the skeg bottom for the buckling behavior and further investigated the suitability of the skeg bottom applied to actual vessels. The results of this study will provide basic data to develop a calculation formula that determines the thickness of the stern skeg bottom in the future by evaluating the final strength with buckling.
However, due to the expiration of the patent period, revision of the calculation formula is required for each class. This study first identified the elastic buckling phenomenon due to the biaxial compressive load of the skeg bottom for the buckling behavior and further investigated the suitability of the skeg bottom applied to actual vessels. The results of this study will provide basic data to develop a calculation formula that determines the thickness of the stern skeg bottom in the future by evaluating the final strength with buckling.
To examine the buckling safety of perforated plates subjected to combined load, this study set design parameters for the perforation diameter of the skeg bottom based on actual vessels and further considered the size of the perforation, slenderness ratio, and properties of plate thickness. ANSYS linear buckling V13, a commercial finite element structural analysis program, was used to perform the buckling strength analysis for the target model.
Thus, although a thick plate that guarantees brittle crack arrestability should also be considered, a general thick steel plate is used. To solve this problem, first, the critical stress was theoretically calculated using the interaction curve equation according to the combined load for the buckling behavior of the stern skeg bottom in which the biaxial compression acts, and the following conclusions were drawn through the linear buckling analysis.

이론/모형

ANSYS linear buckling V13, a commercial finite element structural analysis program, was used to perform the buckling strength analysis for the target model. A 100-mm (wide/long) grid was formed to closely discriminate the behavior of the perforated column, which has 68, 870 nodes and 12, 950 elements, and a shell element with six degrees of freedom was applied at each node of the finite element.

성능/효과

1. The excessive thickness of the hull plate around the perforation was applied in the design although the stress was 78 MPa, which is far below the allowable yield stress, even when applying the rudder force of a large container ship, which can occur at the stern of the vessel, as the maximum force.
As shown in the results, for the maximum strain , which represents the strain the skeg bottom can withstand without being destroyed, _ and _ becomes 355 MPa is 1, 386 MPa at the stress ratio of 3.9.
The vessels were sorted by vessel type, and the one with the highest rudder force from the data was selected as the target model. In the survey of the rudder force by vessel type, and the cross-sectional form factor of the rudder, which are most commonly used in actual vessels, the rudder force of the large container vessel was the largest, and the cross-sectional form factor in this case was confirmed to be of the hollow type. Fig.

참고문헌 (10)

Park, D. W., "The Stern Hull Form Design using the Flow Analysis around Stern Skeg," Journal of the Society of Naval Architects of Korea, Vol. 45, No. 4, pp. 361-369, 2008.

원문보기 상세보기
Jeon, S. B. Kim, J. Y. Han, S. M. Kim, B. J. Jang, G. B. Seo, Y. S., "Fatigue Evaluation of Rudder Skeg and Adjacent Structure of Container Ship," The Society of Naval Architects of Korea, pp. 592-596, 2012.
Kim, K. S. Jin, J., "Multi-criteria Structure Optimization Methods and their Applications," Journal of the Society of Naval Architects of Korea, Vol. 46, No. 4, pp. 409-416, 2009.

원문보기 상세보기
Hwang, S. B., Park, J. S., Lee, K. D., Park, S. H., "Optimum Design of Thick Structural Member in way of Upper Deck of Container Carrier," The Society of Naval Architects of Korea, pp. 694-697, 2011.
Ham, J. H., " Design System of Doubler Plate of Ship Plate Members under Various In-plane and Out-of-plane Loads," Journal of the Society of Naval Architects of Korea, Vol. 55, No. 6, pp. 521-526,2018.

원문보기 상세보기
Ham, J. H., "Development of Doubler Design System for Ship Plate Members Subjected to In-plane Shear and Biaxial Compressive Loads," Journal of the Society of Naval Architects of Korea, Vol. 54, No. 3, pp. 242-249, 2017.

원문보기 상세보기
Ko, J. Y., Lee, J. M., Park, J. S., Joo, J. K., "A Study on the Ultimate Strength accompanied Buckling of Ship Plating with Cutout," Korean Institute of Navigation and Port Research, pp. 343-348, 2003.
Park, J. S. Choi, J. H. Hong, K. Y. Lee, G. W., "Estimation of Buckling and Collapse Behaviour for Continuous Stiffened Plate under Combined Transverse Axial Compression and Lateral Pressure," Journal of Navigation and Port Research, Vol. 33, No. 1, pp. 27-33, 2009.

원문보기 상세보기
Park, J. S. Ko, J. Y. Kim, Y. Y., "Collapse Analysis of Ultimate Strength for the Aluminium Stiffened Plate subjected to Compressive Load," Journal of Navigation and Port Research, Vol. 31, No. 10, pp. 825-831, 2007.

원문보기 상세보기
Paik, J. K., Ultimate Limit State Analysis and Design of Plated Structures, John Wiley & Sons, Chichester, UK, 2018.

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선미 스케그 외판의 좌굴강도에 관한 연구
A Study on the Buckling Strength of Stern Skeg Shell Plate 원문보기

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선미 스케그 외판의 좌굴강도에 관한 연구 A Study on the Buckling Strength of Stern Skeg Shell Plate 원문보기

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선미 스케그 외판의 좌굴강도에 관한 연구
A Study on the Buckling Strength of Stern Skeg Shell Plate 원문보기

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