Ultimate Strength and Collapse Behavior of Ring-Stiffened Cylindrical Shells Under External Pressure With Shell Buckling or Stiffener Torsional Buckling

2020 ◽  
Author(s):  
Daisuke Shiomitsu ◽  
Daisuke Yanagihara
Keyword(s):  
Ultimate Strength ◽  
Slenderness Ratio ◽  
Cylindrical Shells ◽  
Deformation Mode ◽  
Initial Deflection ◽  
Localized Deformation ◽  
Torsional Buckling ◽  
Shell Buckling ◽  
Collapse Behavior ◽  
Stiffened Cylindrical Shells

Abstract A series of ultimate strength analyses of ring-stiffened cylindrical shells with various dimensions and scantlings is carried out applying the nonlinear finite element method. The detailed buckling/plastic collapse behavior including the influence of initial deflection applied in the ultimate strength analyses is investigated. In most past studies, detailed classification of collapse modes and investigation of the influence of the initial deflection mode have not been sufficiently conducted. In this study, firstly the ultimate strength analyses of 288 cases varying the dimensions of the ring-stiffened cylindrical shell and the attachment direction of the stiffeners, inside or outside, are performed. From the results, the collapse modes are classified into five modes, which are stiffener-torsional buckling collapse (localized deformation mode and mode to keep strength after the ultimate strength), shell buckling collapse (localized deformation mode and mode with kinking lines), and combined collapse of the buckling modes. A slenderness ratio is proposed using elastic buckling strength and pressure when the circumferential stress reaches the yield stress, and the possibility of estimating the ultimate strength is indicated.

scholarly journals Experimental Study and Development of Design Formula for Estimating the Ultimate Strength of Curved Plates

2021 ◽  
Vol 11 (5) ◽  
pp. 2379
Author(s):  
Jeong-Hyeon Kim ◽  
Doo-Hwan Park ◽  
Seul-Kee Kim ◽  
Myung-Sung Kim ◽  
Jae-Myung Lee
Keyword(s):  
Aspect Ratio ◽  
Ultimate Strength ◽  
Large Deflection ◽  
Slenderness Ratio ◽  
Compressive Load ◽  
Element Analysis ◽  
Shipbuilding Industry ◽  
Design Formula ◽  
Deflection Analysis ◽  
Collapse Behavior

The curved plate has been extensively used as a structural member in many industrial fields, especially the shipbuilding industry. The present study investigated the ultimate strength and collapse behavior of the simply supported curved plate under a longitudinal compressive load. To do this, experimental apparatuses for evaluating the buckling collapse test of the curved plates was developed. Then, a series of buckling collapse experiments was carried out by considering the flank angle, slenderness ratio, and aspect ratio of plates. To examine the fundamental buckling and collapse behavior of the curved plate, elastoplastic large deflection analysis was performed using the commercial finite element analysis program. On the basis of both the experimental and FE analysis, the effects of the flank angle, slenderness ratio, and aspect ratio on the characteristics of the buckling and collapse behavior of the curved plates are discussed. Finally, the empirical design formula for predicting the ultimate strength of curved plates was derived. The proposed empirical formula is a good indicator for estimating the behavior of the curved plate.

Effect of Initial Distortions on the Ultimate Capacity of Pitting Corroded Plates

2013 ◽  
Author(s):  
Xiaoli Jiang ◽  
C. Guedes Soares
Keyword(s):  
Ultimate Strength ◽  
Input Data ◽  
Fem Analysis ◽  
Influential Factors ◽  
Steel Plates ◽  
Initial Deflection ◽  
Biaxial Compression ◽  
Ultimate Capacity ◽  
Nonlinear Fem ◽  
Collapse Behavior

The aim of the present paper is to investigate the effects of the initial deflection shape on the ultimate capacity of pitting corroded plates under biaxial compression. A series of nonlinear FEM analysis of plates with partial depth pits are carried out, changing the geometrical attributes of both pits and plates, i.e., the radius, depth and location of the pits and the slenderness of the plates. A realistic thin-horse shape initial deflection and a simplified buckling shape initial deflection are assumed and compared. It is shown that the initial deflection shape has a tremendous effect on the ultimate strength of pitted mild steel plates. The ultimate strength of a pitted plate with thin-horse shaped initial deflection is generally lower than that of a plate with buckling shaped initial deflection provided that other influential factors are same. Their deviation is sensitive to plate slenderness and pit intensity. The simplified buckling shaped initial deflection could be sufficient to predict the ultimate strength of the plate under longitudinal uniaxial compression. However, in case of less predominant biaxial compression, the buckling shaped initial deflection may overestimate the prediction and give non-conservative results. In this respect, it is preferable to use the initial deflection measurements as input data for the analysis of the plate collapse behavior.

Characteristics of Buckling and Ultimate Strength and Collapse Behaviour of Cylindrically Curved Plates Subjected to Axial Compression

2008 ◽  
Vol 33-37 ◽  
pp. 1195-1200 ◽  
Author(s):  
Joo Shin Park ◽  
Kazuhiro Iijima ◽  
Tetsuya Yao
Keyword(s):  
Ultimate Strength ◽  
Axial Compression ◽  
Numerical Solutions ◽  
Slenderness Ratio ◽  
Axial Loading ◽  
Initial Imperfection ◽  
Least Square Method ◽  
Least Square ◽  
Circular Cylinders ◽  
Collapse Behavior

In the present paper, to clarify and examine the fundamental buckling behaviours of cylindrically curved plates subjected to axial loading, a series of elastic and elasto-plastic large deflection analyses as well as elastic eigen buckling analysis are performed together with the comparisons with the buckling behaviours of circular cylinder. On the basis of the numerical results, the effects of curvature, magnitude of initial imperfection, slenderness ratio and aspect ratio on the characteristics of the buckling and post buckling collapse behavior of cylindrically curved plates and circular cylinders under axial compression are discussed. The buckling strength and ultimate strength formulae of the cylindrically curved plate are empirically derived based on the FEM series analysis by curve fitting using least square method. The validity of the ultimate strength formulations developed in this study has to some extent been verified through comparison with nonlinear numerical solutions.

Effect of Initial Deflection Shape on the Ultimate Strength Behavior of Welded Steel Plates Under Biaxial Compressive Loads

2004 ◽  
Vol 48 (01) ◽  
pp. 45-60 ◽  
Author(s):  
Jeom Kee Paik ◽  
Anil Kumar Thayamballi ◽  
Jae Myung Lee
Keyword(s):  
Ultimate Strength ◽  
Axial Compression ◽  
Maximum Amplitude ◽  
Steel Plates ◽  
Initial Deflection ◽  
Biaxial Compression ◽  
Good Representation ◽  
Strength Behavior ◽  
Compressive Loads ◽  
Collapse Behavior

The shape of weld-induced initial distortion in steel plates bounded by support members is normally very complex. It must be recognized that it is not only the magnitude of initial distortion, but also its shape that can significantly affect the plate collapse behavior. In this paper, some typical plate initial deflection shapes are selected from measurements for merchant ship plating between stiffeners. The influence of such initial deflection shapes on the ultimate strength behavior of steel plates subjected to biaxial compression as well as uniaxial thrust is then investigated applying nonlinear finite element analyses. It is confirmed that an initial deflection shape that approximates the buckling mode, with its maximum amplitude selected to be the same as the measured maximum initial deflection, is a good representation for the purposes of somewhat pessimistic evaluation of the ultimate strength of plating between stiffeners under biaxial compression as well as under uniaxial compression. Also, it appears that the influence of initial deflection shape on the plate collapse behavior under predominantly transverse axial compression or biaxial compression can be quite different from that under predominantly longitudinal axial compression. As another contribution, the ultimate strength interaction relationship of plating under biaxial compressive loads is presented. The results and insights developed from the present study are summarized.

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