The Experts below are selected from a list of 3615 Experts worldwide ranked by ideXlab platform
Jeom Kee Paik - One of the best experts on this subject based on the ideXlab platform.
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direct measurements numerical predictions and simple formula estimations of welding induced biaxial residual stresses in a full scale steel Stiffened Plate structure
2021Co-Authors: Sung Hwan Noh, Jeom Kee Paik, Dong Hun Lee, Dong Houi SeoAbstract:Abstract As a sequel to another paper of the authors on welding-induced initial deformations [1], this paper aimed to obtain a direct measurement database of welding-induced biaxial residual stresses in a full-scale steel Stiffened Plate structure and also to study the applicability of computational models to predict them. A full-scale steel Stiffened Plate structure in association with Plate panels in bottom structures of an as-built containership carrying 1900 TEU was fabricated using exactly the same welding technology as used in today’s shipbuilding industry. The X-ray diffraction method was employed to measure the biaxial residual stress distributions in the plating. In addition to simple formula estimations, computational models using the three-dimensional thermo-elastic-plastic finite element method were applied to predict the biaxial residual stress distributions. A comparison between full-scale measurements, numerical predictions and simple formula estimations was made. Details of the full-scale measurements are documented as they can be useful to validate the computational models formulated by other researchers.
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Ultimate Compressive Strength Computational Modeling for Stiffened Plate Panels with Nonuniform Thickness
2020Co-Authors: Hyun Ho Lee, Jeom Kee PaikAbstract:The aim of this paper is to develop computational models for the ultimate compressive strength analysis of Stiffened Plate panels with nonuniform thickness. Modeling welding-induced initial deformations and residual stresses was presented with the measured data. Three methods, i.e., ANSYS finite element method, ALPS/SPINE incremental Galerkin method, and ALPS/ULSAP analytical method, were employed together with existing test database obtained from a full-scale collapse testing of steel-Stiffened Plate structures. Sensitivity study was conducted with varying the difference in Plate thickness to define a representative (equivalent) thickness for Plate panels with nonuniform thickness. Guidelines are provided for structural modeling to compute the ultimate compressive strength of Plate panels with variable thickness.
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full scale collapse testing of a steel Stiffened Plate structure under cyclic axial compressive loading
2020Co-Authors: Jeom Kee Paik, Dae Kyeom Park, Jonas W RingsbergAbstract:Plate panels of ships and floating offshore structures are likely subjected to cyclic loads arising from waves at sea. Depending on sea states, e.g., whipping in harsh sea states, the maximum amplitude of the cyclic loads may reach over 70% of ultimate loads. Of concerns is how the cyclic loads will affect the ultimate strength compared to a case of monotonically increasing loads. The aim of this paper is to experimentally investigate the ultimate strength characteristics of a steel Stiffened Plate structure under cyclic axial-compressive loading. A full-scale collapse testing in association with bottom structures of an as-built 1,900 TEU containership was conducted. It is concluded that the effects of cyclic loading on the ultimate compressive strength of steel Stiffened Plate structures are small as far as fatigue damages are not suffered due to the small number of load cycles and/or local structural members do not reach the ultimate strength during cyclic axial-compressive loading. Details of the test database are documented, which will be useful to validate computational models for the ultimate strength analysis.
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direct measurements and numerical predictions of welding induced initial deformations in a full scale steel Stiffened Plate structure
2020Co-Authors: Dong Hun Lee, Jeom Kee Paik, Hyun Ho LeeAbstract:Abstract As a sequel to another paper of the authors on welding-induced residual stresses [1], this paper aimed to obtain a direct measurement database of welding-induced initial deformations in a full-scale steel Stiffened Plate structure and also to study the applicability of computational models to predict them. A full-scale steel Stiffened Plate structure in association with bottom Plate panels of an as-built 1,900 TEU containership was fabricated by exactly the same technology of welding as used in today's shipbuilding industry. The 3D scanner was employed to measure welding-induced initial deformations of the structure. Computational models using the three-dimensional thermo-elastic-plastic finite element method were developed to predict the Plate initial deflections. A comparison between direct measurements and numerical predictions was made. Details of direct measurement databases are documented as they are useful to validate the computational models formulated by other researchers.
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full scale collapse testing of a steel Stiffened Plate structure under axial compressive loading at a temperature of 80 c
2020Co-Authors: Jeom Kee Paik, Dae Kyeom Park, Jonas W RingsbergAbstract:The aim of the paper was to develop a test database of the ultimate strength characteristics of full-scale steel Stiffened Plate structures under axial compressive loading at a temperature of −80°C...
Jonas W Ringsberg - One of the best experts on this subject based on the ideXlab platform.
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the issc 2022 committee iii 1 ultimate strength benchmark study on the ultimate limit state analysis of a Stiffened Plate structure subjected to uniaxial compressive loads
2021Co-Authors: Jonas W Ringsberg, Masahiko Fujikubo, Ionel Darie, Ken Nahshon, Gillian Shilling, Murilo Augusto Vaz, S Benson, Lars Brubak, Guoqing Feng, Marco GaiottiAbstract:This paper presents a benchmark study on the ultimate limit state analysis of a Stiffened Plate structure subjected to uniaxial compressive loads, initiated and coordinated by the ISSC 2022 technical committee III.1-Ultimate Strength. The overall objective of the benchmark is to establish predictions of the buckling collapse and ultimate strength of Stiffened Plate structures subjected to compressive loads. Participants were asked to perform ultimate strength predictions for a full-scale reference experiment on a Stiffened steel Plate structure utilizing any combination of class rules, guidelines, numerical approaches and simulation procedures as they saw fit. The benchmark study was carried out blind and divided into three phases. In the first phase, only descriptions of the experimental setup, the geometry of the reference structure, and the nominal material specifications were distributed. In the second phase, the actual properties of the reference structure were included. In the third and final phase, all available information on the reference structure and measured properties were distributed, including the material properties and laser-scanned geometry. This paper presents the results obtained from seventeen submitted FE simulations as well as details on the experiment. It also presents comparisons of the force versus the displacement curve, failure modes and locations for each phase, among others, and a discussion on the participants’ ability to predict the characteristics of the reference experiment with the information that is available for the phase. The outcome of the study is a discussion and recommendations regarding the design of finite element models for the ultimate state analysis of Stiffened Plate structures, with emphasis on the prediction of the ultimate capacity, force-displacement curve, and failure mode and location related to access to data, uncertainties and modeling of the material properties, geometric imperfections and distortions, and residual stresses.
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full scale collapse testing of a steel Stiffened Plate structure under cyclic axial compressive loading
2020Co-Authors: Jeom Kee Paik, Dae Kyeom Park, Jonas W RingsbergAbstract:Plate panels of ships and floating offshore structures are likely subjected to cyclic loads arising from waves at sea. Depending on sea states, e.g., whipping in harsh sea states, the maximum amplitude of the cyclic loads may reach over 70% of ultimate loads. Of concerns is how the cyclic loads will affect the ultimate strength compared to a case of monotonically increasing loads. The aim of this paper is to experimentally investigate the ultimate strength characteristics of a steel Stiffened Plate structure under cyclic axial-compressive loading. A full-scale collapse testing in association with bottom structures of an as-built 1,900 TEU containership was conducted. It is concluded that the effects of cyclic loading on the ultimate compressive strength of steel Stiffened Plate structures are small as far as fatigue damages are not suffered due to the small number of load cycles and/or local structural members do not reach the ultimate strength during cyclic axial-compressive loading. Details of the test database are documented, which will be useful to validate computational models for the ultimate strength analysis.
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full scale collapse testing of a steel Stiffened Plate structure under axial compressive loading at a temperature of 80 c
2020Co-Authors: Jeom Kee Paik, Dae Kyeom Park, Jonas W RingsbergAbstract:The aim of the paper was to develop a test database of the ultimate strength characteristics of full-scale steel Stiffened Plate structures under axial compressive loading at a temperature of −80°C...
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full scale collapse testing of a steel Stiffened Plate structure under axial compressive loading triggered by brittle fracture at cryogenic condition
2020Co-Authors: Jeom Kee Paik, Dae Kyeom Park, Jonas W RingsbergAbstract:This paper is a sequel to the authors’ earlier article (Paik et al. 2020a, Full-scale collapse testing of a steel Stiffened Plate structure under cyclic axial-compressive loading, Structures, https://doi.org/10.1016/j.istruc.2020.05.026). The aim of the paper was to present a test data on the ultimate compressive strength characteristics of a full-scale steel Stiffened Plate structure at cryogenic condition which may be due to unwanted release of liquefied gases. Steel Plate panels of an as-built containership carrying 1,900 TEU were referenced for this purpose. The test structure was fabricated in a shipyard using exactly the same welding technology as used in today’s shipbuilding industry. It is observed that the test structure reaches the ultimate limit states triggered by brittle fracture, which is totally different from typical collapse modes at room temperature. Details of the test database are documented as they can be used to validate computational models for the structural crashworthiness analysis involving brittle fracture at cryogenic condition.
Dae Kyeom Park - One of the best experts on this subject based on the ideXlab platform.
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full scale collapse testing of a steel Stiffened Plate structure under cyclic axial compressive loading
2020Co-Authors: Jeom Kee Paik, Dae Kyeom Park, Jonas W RingsbergAbstract:Plate panels of ships and floating offshore structures are likely subjected to cyclic loads arising from waves at sea. Depending on sea states, e.g., whipping in harsh sea states, the maximum amplitude of the cyclic loads may reach over 70% of ultimate loads. Of concerns is how the cyclic loads will affect the ultimate strength compared to a case of monotonically increasing loads. The aim of this paper is to experimentally investigate the ultimate strength characteristics of a steel Stiffened Plate structure under cyclic axial-compressive loading. A full-scale collapse testing in association with bottom structures of an as-built 1,900 TEU containership was conducted. It is concluded that the effects of cyclic loading on the ultimate compressive strength of steel Stiffened Plate structures are small as far as fatigue damages are not suffered due to the small number of load cycles and/or local structural members do not reach the ultimate strength during cyclic axial-compressive loading. Details of the test database are documented, which will be useful to validate computational models for the ultimate strength analysis.
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full scale collapse testing of a steel Stiffened Plate structure under axial compressive loading at a temperature of 80 c
2020Co-Authors: Jeom Kee Paik, Dae Kyeom Park, Jonas W RingsbergAbstract:The aim of the paper was to develop a test database of the ultimate strength characteristics of full-scale steel Stiffened Plate structures under axial compressive loading at a temperature of −80°C...
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full scale collapse testing of a steel Stiffened Plate structure under axial compressive loading triggered by brittle fracture at cryogenic condition
2020Co-Authors: Jeom Kee Paik, Dae Kyeom Park, Jonas W RingsbergAbstract:This paper is a sequel to the authors’ earlier article (Paik et al. 2020a, Full-scale collapse testing of a steel Stiffened Plate structure under cyclic axial-compressive loading, Structures, https://doi.org/10.1016/j.istruc.2020.05.026). The aim of the paper was to present a test data on the ultimate compressive strength characteristics of a full-scale steel Stiffened Plate structure at cryogenic condition which may be due to unwanted release of liquefied gases. Steel Plate panels of an as-built containership carrying 1,900 TEU were referenced for this purpose. The test structure was fabricated in a shipyard using exactly the same welding technology as used in today’s shipbuilding industry. It is observed that the test structure reaches the ultimate limit states triggered by brittle fracture, which is totally different from typical collapse modes at room temperature. Details of the test database are documented as they can be used to validate computational models for the structural crashworthiness analysis involving brittle fracture at cryogenic condition.
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full scale fire testing to collapse of steel Stiffened Plate structures under lateral patch loading part 1 without passive fire protection
2020Co-Authors: Jeom Kee Paik, Dae Kyeom Park, Min Gyu Ryu, Dong Hun Lee, Seung Yul Lee, Giles ThomasAbstract:The aim of this paper is to present a fire test database on the collapse of a full-scale steel Stiffened Plate structure without passive fire protection under lateral patch loading. Steel Plate pan...
Zhang Jing - One of the best experts on this subject based on the ideXlab platform.
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dynamic response researches of ship Stiffened Plate structure subjected to underwater contact explosions
2009Co-Authors: Zhang JingAbstract:In order to study the dynamical responses of ship Stiffened Plate structure under underwater contact explosions,the FEM code LS-DYNA was used to discuss the problem which had six Stiffened Plate structures.The Stiffened Plate's distortion and the size of crevasses in the numerical simulation were analyzed.The position where the maximal plastic strain appeared,the curve of effective stress and acceleration were described.It was revealed that the deformation of Stiffened Plate was different with the position of the stiffener,but the stiffener could harmonize and reduce the deformation of Plate,and the whole structure would be more safety when it was subjected to explosions.So the research could be help to the design of ship's explosive resistance.
Dong Hun Lee - One of the best experts on this subject based on the ideXlab platform.
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direct measurements numerical predictions and simple formula estimations of welding induced biaxial residual stresses in a full scale steel Stiffened Plate structure
2021Co-Authors: Sung Hwan Noh, Jeom Kee Paik, Dong Hun Lee, Dong Houi SeoAbstract:Abstract As a sequel to another paper of the authors on welding-induced initial deformations [1], this paper aimed to obtain a direct measurement database of welding-induced biaxial residual stresses in a full-scale steel Stiffened Plate structure and also to study the applicability of computational models to predict them. A full-scale steel Stiffened Plate structure in association with Plate panels in bottom structures of an as-built containership carrying 1900 TEU was fabricated using exactly the same welding technology as used in today’s shipbuilding industry. The X-ray diffraction method was employed to measure the biaxial residual stress distributions in the plating. In addition to simple formula estimations, computational models using the three-dimensional thermo-elastic-plastic finite element method were applied to predict the biaxial residual stress distributions. A comparison between full-scale measurements, numerical predictions and simple formula estimations was made. Details of the full-scale measurements are documented as they can be useful to validate the computational models formulated by other researchers.
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direct measurements and numerical predictions of welding induced initial deformations in a full scale steel Stiffened Plate structure
2020Co-Authors: Dong Hun Lee, Jeom Kee Paik, Hyun Ho LeeAbstract:Abstract As a sequel to another paper of the authors on welding-induced residual stresses [1], this paper aimed to obtain a direct measurement database of welding-induced initial deformations in a full-scale steel Stiffened Plate structure and also to study the applicability of computational models to predict them. A full-scale steel Stiffened Plate structure in association with bottom Plate panels of an as-built 1,900 TEU containership was fabricated by exactly the same technology of welding as used in today's shipbuilding industry. The 3D scanner was employed to measure welding-induced initial deformations of the structure. Computational models using the three-dimensional thermo-elastic-plastic finite element method were developed to predict the Plate initial deflections. A comparison between direct measurements and numerical predictions was made. Details of direct measurement databases are documented as they are useful to validate the computational models formulated by other researchers.
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full scale fire testing to collapse of steel Stiffened Plate structures under lateral patch loading part 1 without passive fire protection
2020Co-Authors: Jeom Kee Paik, Dae Kyeom Park, Min Gyu Ryu, Dong Hun Lee, Seung Yul Lee, Giles ThomasAbstract:The aim of this paper is to present a fire test database on the collapse of a full-scale steel Stiffened Plate structure without passive fire protection under lateral patch loading. Steel Plate pan...
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Finite element modeling for the progressive collapse analysis of steel Stiffened-Plate structures in fires
2024Co-Authors: Min Gyu Ryu, Dong Hun Lee, Giles Thomas, Sung-in Park, Jeom Kee PaikAbstract:Abstract This paper is a sequel to the authors’ articles which provided the test data on the progressive collapse of full-scale steel Stiffened-Plate structures without and with passive fire protection (PFP) under lateral patch loading in fires [1,2]. This paper presents new computational models for the analyses of heat transfer and fire-induced progressive collapse behaviour of steel Stiffened Plate structures without or with PFP. For this purpose, transient thermal elastic-plastic large-deformation finite element models were formulated. The developed computational models were validated by a comparison with the test data. The novelty of the paper is associated with a new procedure for the fire-induced progressive collapse analysis of steel Stiffened-Plate structures which is critical for a contribution to fire safety engineering of steel Plated structures.
