The Experts below are selected from a list of 1386 Experts worldwide ranked by ideXlab platform
Jan Belis - One of the best experts on this subject based on the ideXlab platform.
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Imperfection sensitivity of locally supported cylindrical silos subjected to uniform axial compression
International Journal of Solids and Structures, 2016Co-Authors: Arne Jansseune, Wouter De Corte, Jan BelisAbstract:Abstract For the prediction of the real failure load of shell structures, such as locally supported cylindrical steel silos under axial compression, it is convenient to take into account Imperfections. It is assumed that such silos are very sensitive to a wide range of (even small) geometric Imperfections, and that they lower the failure load significantly. Furthermore, these Imperfections caused by the fabrication or the manufacturing process, are the dominant factor in the discrepancy between the theoretical/numerical predictions based on a perfect geometry and the experimental results of an imperfect geometry. In other words, it is important to make a well-considered choice for an Imperfection when predicting the real failure load. However, the Imperfection sensitivity depends, among other things, on the Shape of the shell, the stiffening configuration, the boundary and loading conditions, etc. Before proceeding to the calculation of interaction curves and the development of new design rules for imperfect barrels, it is essential to perform an extensive study to examine the influence of Imperfections to the failure behaviour and to choose a sufficiently detrimental Imperfection Shape. In this study, different Imperfection forms are numerically investigated: the linear bifurcation mode, the non-linear buckling mode, several post-buckling deformed Shapes of the perfect shell, and a weld depression type A and B. Additional aspects, such as the orientation, the amplitude of the equivalent Imperfection, and the position of the influence of the weld depression are also investigated. The present study takes into account the European normative documents and the guidelines of the recommendations of the ECCS.
Arne Jansseune - One of the best experts on this subject based on the ideXlab platform.
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Imperfection sensitivity of locally supported cylindrical silos subjected to uniform axial compression
International Journal of Solids and Structures, 2016Co-Authors: Arne Jansseune, Wouter De Corte, Jan BelisAbstract:Abstract For the prediction of the real failure load of shell structures, such as locally supported cylindrical steel silos under axial compression, it is convenient to take into account Imperfections. It is assumed that such silos are very sensitive to a wide range of (even small) geometric Imperfections, and that they lower the failure load significantly. Furthermore, these Imperfections caused by the fabrication or the manufacturing process, are the dominant factor in the discrepancy between the theoretical/numerical predictions based on a perfect geometry and the experimental results of an imperfect geometry. In other words, it is important to make a well-considered choice for an Imperfection when predicting the real failure load. However, the Imperfection sensitivity depends, among other things, on the Shape of the shell, the stiffening configuration, the boundary and loading conditions, etc. Before proceeding to the calculation of interaction curves and the development of new design rules for imperfect barrels, it is essential to perform an extensive study to examine the influence of Imperfections to the failure behaviour and to choose a sufficiently detrimental Imperfection Shape. In this study, different Imperfection forms are numerically investigated: the linear bifurcation mode, the non-linear buckling mode, several post-buckling deformed Shapes of the perfect shell, and a weld depression type A and B. Additional aspects, such as the orientation, the amplitude of the equivalent Imperfection, and the position of the influence of the weld depression are also investigated. The present study takes into account the European normative documents and the guidelines of the recommendations of the ECCS.
Wouter De Corte - One of the best experts on this subject based on the ideXlab platform.
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Imperfection sensitivity of locally supported cylindrical silos subjected to uniform axial compression
International Journal of Solids and Structures, 2016Co-Authors: Arne Jansseune, Wouter De Corte, Jan BelisAbstract:Abstract For the prediction of the real failure load of shell structures, such as locally supported cylindrical steel silos under axial compression, it is convenient to take into account Imperfections. It is assumed that such silos are very sensitive to a wide range of (even small) geometric Imperfections, and that they lower the failure load significantly. Furthermore, these Imperfections caused by the fabrication or the manufacturing process, are the dominant factor in the discrepancy between the theoretical/numerical predictions based on a perfect geometry and the experimental results of an imperfect geometry. In other words, it is important to make a well-considered choice for an Imperfection when predicting the real failure load. However, the Imperfection sensitivity depends, among other things, on the Shape of the shell, the stiffening configuration, the boundary and loading conditions, etc. Before proceeding to the calculation of interaction curves and the development of new design rules for imperfect barrels, it is essential to perform an extensive study to examine the influence of Imperfections to the failure behaviour and to choose a sufficiently detrimental Imperfection Shape. In this study, different Imperfection forms are numerically investigated: the linear bifurcation mode, the non-linear buckling mode, several post-buckling deformed Shapes of the perfect shell, and a weld depression type A and B. Additional aspects, such as the orientation, the amplitude of the equivalent Imperfection, and the position of the influence of the weld depression are also investigated. The present study takes into account the European normative documents and the guidelines of the recommendations of the ECCS.
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Imperfection sensitivity of locally supported cylindrical silos subjected to uniform axial compression
'Elsevier BV', 2016Co-Authors: Jansseune Arne, Wouter De Corte, Belis, Jlif JanAbstract:\u3cbr/\u3eFor the prediction of the real failure load of shell structures, such as locally supported cylindrical steel silos under axial compression, it is convenient to take into account Imperfections. It is assumed that such silos are very sensitive to a wide range of (even small) geometric Imperfections, and that they lower the failure load significantly. Furthermore, these Imperfections caused by the fabrication or the manufacturing process, are the dominant factor in the discrepancy between the theoretical/numerical predictions based on a perfect geometry and the experimental results of an imperfect geometry. In other words, it is important to make a well-considered choice for an Imperfection when predicting the real failure load. However, the Imperfection sensitivity depends, among other things, on the Shape of the shell, the stiffening configuration, the boundary and loading conditions, etc. Before proceeding to the calculation of interaction curves and the development of new design rules for imperfect barrels, it is essential to perform an extensive study to examine the influence of Imperfections to the failure behaviour and to choose a sufficiently detrimental Imperfection Shape.\u3cbr/\u3e\u3cbr/\u3eIn this study, different Imperfection forms are numerically investigated: the linear bifurcation mode, the non-linear buckling mode, several post-buckling deformed Shapes of the perfect shell, and a weld depression type A and B. Additional aspects, such as the orientation, the amplitude of the equivalent Imperfection, and the position of the influence of the weld depression are also investigated. The present study takes into account the European normative documents and the guidelines of the recommendations of the ECCS.\u3cbr/\u3e\u3cbr/\u3
Xinhu Zhang - One of the best experts on this subject based on the ideXlab platform.
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critical force of upheaval buckling for imperfect subsea pipe in pipe pipelines on nonlinear foundation
Applied Ocean Research, 2021Co-Authors: Xinhu Zhang, Guang PanAbstract:Abstract Upheaval buckling behaviors of imperfect subsea PIP (pipe-in-pipe) pipelines on nonlinear foundation are studied using finite element method. A parametric study is performed and the effects of the parameters on the critical force of upheaval buckling are discussed, including initial Imperfection amplitude to wavelength ratio (AWR), the characteristic parameter of initial Imperfection Shape, stiffness ratio, clearance between outer and inner pipes, and soil condition as well as vertical pipe-soil interaction. A simplified empirical formula considering the above factors is presented to determine the critical force of upheaval buckling for subsea PIP pipelines based on dimensional analysis and the results of the parametric study. The results of case studies show that the proposed empirical formula has good accuracy.
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an unified formula for the critical force of lateral buckling of imperfect submarine pipelines
Ocean Engineering, 2018Co-Authors: Xinhu Zhang, Guedes C Soares, Chen AnAbstract:Abstract Unburied submarine pipelines might buckle laterally under the conditions of high temperature and high pressure. As an important design parameter of submarine pipelines, the lateral buckling critical force (LBCF) is affected by the maximum amplitude, wavelength, Shape of the initial Imperfection, and etc. However, the exact relationship between the LBCF and the initial Imperfection Shape is not clear at present. In this paper, the lateral buckling behaviors of submarine pipelines with different initial Imperfection Shapes are studied using 3D finite element (FE) analysis. A parametric study is conducted and the characteristic parameter of the initial Imperfection Shape is found. It is the characteristic parameter that makes the LBCF greatly affected by the initial Imperfection Shape. A unified formula is proposed to reveal the exact relationship between the LBCF and the initial Imperfection Shape. An application of the unified formula is carried out and the results show the accuracy of the unified formula.
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prediction of the upheaval buckling critical force for imperfect submarine pipelines
Ocean Engineering, 2015Co-Authors: Xinhu ZhangAbstract:Upheaval buckling behavior of submarine pipelines under high temperature and high pressure conditions is a primary concern for structural integrity. The critical axial force is a key factor governing the buckling behavior. There have been already some formulas to calculate critical axial force for some particular initial Imperfection Shapes. However, there is no universal formula to express the effects of initial Imperfection Shape and Out-of-Straight (OOS) on the critical axial force. In this paper, the upheaval buckling behaviors of eight groups of pipeline segments with different Imperfection Shapes and different OOS have been studied using the finite element method. A new parameter is defined to express the differences of Imperfection Shapes. An approximation and universal formula is proposed to calculate the critical axial force which covers the new parameter and the OOS of pipeline. A case study is presented which illustrates the application of the formula. Finally, comparison between this study and previous research results is conducted, and it manifests that this formula has a greater precision.
Chiara Bisagni - One of the best experts on this subject based on the ideXlab platform.
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numerical analysis and experimental correlation of composite shell buckling and post buckling
Composites Part B-engineering, 2000Co-Authors: Chiara BisagniAbstract:Abstract This paper deals with the buckling and post-buckling behaviour of carbon fibre reinforced plastic cylindrical shells under axial compression. The finite element analysis is used to investigate this problem and three different types of analysis are compared: eigenvalue analysis, non-linear Riks method and dynamic analysis. The effect of geometric Imperfection Shape and amplitude on critical loads is discussed. A numerical–experimental correlation is performed, using the results of experimental buckling tests. The geometric Imperfections measured on the real specimens are accounted for in the finite element model. The results show the reliability of the method to follow the evolution of the cylinder Shape from the buckling to the post-buckling field and good accuracy in reproducing the experimental post-buckling behaviour.
