Influence of lateral pressure on load-shortening behavior of stiffened panels under combined loads

2015 ◽  
pp. 467-476
Keyword(s):  
Lateral Pressure ◽  
Stiffened Panels ◽  
Combined Loads

Advanced Closed-Form Ultimate Strength Formulation for Ships

2001 ◽  
Vol 45 (02) ◽  
pp. 111-132 ◽  
Author(s):  
Jeom Kee Paik ◽  
Owen F. Hughes ◽  
Alaa E. Mansour
Keyword(s):  
Ultimate Strength ◽  
Structural Damage ◽  
Lateral Pressure ◽  
Local Buckling ◽  
Bending Moment ◽  
Stiffened Panels ◽  
Initial Imperfections ◽  
Ship Hulls ◽  
Collapse Column ◽  
Side Shell

The aim of this paper is to develop an advanced ultimate strength formulation for ship hulls under vertical bending moment. Since the overall failure of a ship hull is normally governed by buckling and plastic collapse of the deck, bottom, and sometimes the side shell stiffened panels, it is of crucial importance to accurately calculate the ultimate strength of stiffened panels in deck, bottom and side shell for more advanced ultimate strength analyses. In this regard, the developed formulation is designed to be more sophisticated than previous simplified theoretical methods for calculating the ultimate strength of stiffened panels under combined axial load, in-plane bending and lateral pressure. Fabrication-related initial imperfections (initial deflections and residual stresses) and potential structural damage related to corrosion, collision, or grounding are included in the panel ultimate strength calculations as parameters of influence. All possible collapse modes involved in collapse of stiffened panels, including overall buckling collapse, column or beam-column type collapse (plate or stiffener induced collapse), tripping of stiffeners and local buckling of stiffener web, are considered. As illustrative examples, the paper investigates and discusses the sensitivity of parameters such as lateral pressure, fabrication-related initial imperfections, corrosion, collision and grounding damage on the ultimate strength of a typical Cape size bulk carrier hull under vertical bending.

Finite Element Analysis of Top-Hat–Stiffened Panels of Fiber-Reinforced–Plastic Boat Structures

2007 ◽  
Vol 44 (01) ◽  
pp. 16-26
Author(s):  
Ömer Eksik ◽  
R. Ajit Shenoi ◽  
Stuart S. J. Moy ◽  
Han Koo Jeong
Keyword(s):  
Finite Element ◽  
Lateral Pressure ◽  
Three Dimensional ◽  
Element Model ◽  
Stiffened Panel ◽  
Element Analysis ◽  
Stiffened Panels ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Experimental Findings

This paper describes the development of a finite element model in order to assess the static response of a top-hat-stiffened panel under uniform lateral pressure. Systematic calculations were performed for deflection, strain, and stress using the developed model based on the ANSYS three-dimensional solid element (SOLID45). The numerical modeling results were compared to the experimental findings for validation and to further understand an internal stress pattern within the different constituents of the panel for explaining the likely causes of the panel failure. Good correlation between experimental and numerical strains and displacements was achieved.

Nonlinear Response of Stiffened Panel Suffered from Thermo-Acoustic Loadings

2014 ◽  
Vol 696 ◽  
pp. 17-22
Author(s):  
Yun Dong Sha ◽  
Huan Yu ◽  
Hao Yuan Wang
Keyword(s):  
Nonlinear Response ◽  
Stiffened Panel ◽  
Vibration Displacement ◽  
Stiffened Panels ◽  
Surface Protection ◽  
Response Characteristics ◽  
Combined Loads ◽  
Actual Use ◽  
Spectrum Density ◽  
Relationship Of

The surface protection systems of aerospace and aircraft are often constructed from discretely stiffened panels to support high thermal acoustic loadings. In actual use, the stiffened panels are often subject to compression, shear and combination of compression and shear loads, bucking instability is the most common failure mode. The analysis of the snap-through process of stiffened panel is always a challenge in the word. This paper studied mainly about the non-liner response of the steel stiffened-plates under combined loads of thermal and acoustic. Firstly, the nonlinear balance equation of bucking process is analysised and a improved arc-length method is introduced . Than the FEM numerical method is used to analysis the nonlinear response of a simply supported stiffened panel under different thermal acoustic loadings. The modal frequency and the vibration displacement and stress are calculated. The displacement power spectrum density is analyzed emphatically. Base on the calculated resulted results, the relationship of the fundamental response frequencies versus temperatures is analyzed comparatively, furthermore, the bucking and snap through response characteristics are discussed as well.

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