Effect of geometrical properties of aluminum extrusion on post-buckling behaviour of stiffened panels in marine applications

2021 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
Mohammed Elmalaki ◽  
Saad Saad-Eldeen ◽  
Heba El-Kilani
Keyword(s):  
Aluminum Extrusion ◽  
Stiffened Panels ◽  
Geometrical Properties ◽  
Post Buckling ◽  
Marine Applications

The Effect of Stitching on Compression Behavior of Stiffened Composite Panels

2001 ◽  
Author(s):  
Sung S. Suh ◽  
H. Thomas Hahn ◽  
Nanlin Han ◽  
Jenn-Ming Yang
Keyword(s):  
Beneficial Effect ◽  
Compression Behavior ◽  
Stiffened Panels ◽  
Shell Elements ◽  
Stitch Density ◽  
Stiffened Composite Panels ◽  
Out Of Plane ◽  
Post Buckling ◽  
Post Impact ◽  
Good Agreement

Abstract Failure of stiffened panels under compression is preceded by buckling of their skin and hence is affected by the presence of out-of-plane stresses. One of the promising methods of preventing premature delamination is stitching. The present paper discusses the effect of such stitching on compression behavior of blade-stiffened panels that were fabricated from plain weave AS4/3501-6 through resin film infusion process. Kevlar 29 yarn was used at a stitch density of 9.92 stitches per cm2. Some of the panels were damaged by drop-weight impact before compression testing. For comparison purposes unstitched panels with the same materials and dimensions were also tested under the same loading conditions. Stitching resulted in a 10% improvement in strength in the absence of any intentional damage. The beneficial effect of stitching was most obvious when the panels were impacted on a flange: a 50% improvement was observed in post-impact strength. However, stitching could not prevent stiffener from failure when impacted directly. Thus stitching had no beneficial effect when impact occurred on a stiffener. A buckling and post-buckling analysis was carried out using 3-D shell elements on the Abaqus. Predictions were in fairly good agreement with the experimental data.

scholarly journals Buckling/post-buckling strength of friction stir welded aircraft stiffened panels

2012 ◽  
Vol 228 (2) ◽  
pp. 178-192 ◽  
Author(s):  
A Murphy ◽  
T Ekmekyapar ◽  
M Özakça ◽  
K Poston ◽  
G Moore ◽  
...  
Keyword(s):  
Stiffened Panels ◽  
Buckling Strength ◽  
Friction Stir ◽  
Post Buckling

scholarly journals Stability Analysis of Different Stiffened Plates in Thermal-Mechanical Coupling Environments

2020 ◽  
Vol 38 (1) ◽  
pp. 40-47
Author(s):  
Liang Ma ◽  
Yu'e Ma ◽  
Qiang Qin
Keyword(s):  
Mechanical Load ◽  
Maximum Load ◽  
Stiffened Panel ◽  
Stiffened Plate ◽  
Stiffened Panels ◽  
Mechanical Coupling ◽  
Cross Section Area ◽  
Out Of Plane ◽  
Post Buckling ◽  
Plane Displacement

In view of the structural stability problem of different typical stiffened panels under different loading conditions, ABAQUS software was used to build finite element models of four typical stiffened panels with the same cross section area. The buckling and post-buckling response of the stiffened panels was analyzed and buckling modes and deflection curves of stiffened panels under mechanical, temperature and thermal-mechanical coupling load were obtained. The result indicates that T type stiffened plate shows great stability under mechanical load, the maximum load is 281KN, which is much higher than that of other types of stiffened panels. The maximum load of a stiffened panel is little affected by the direction of the fillet, but reasonable layout of panels can greatly reduce the out-of-plane displacement of the stiffened panel. There is no obvious pre-buckling process when a panel is under thermal-mechanical coupling load and the post-buckling response is roughly similar as that under mechanical load. But the maximum load of a stiffened plate will decrease by 8%-15% due to the application of temperature load.

scholarly journals Post Buckling Design of Very Thin Stiffened Panels under Cyclic Axial Loading (1st Report)

1991 ◽  
Vol 1991 (170) ◽  
pp. 503-511
Author(s):  
Yukio Ueda ◽  
Yasumitsu Tomita ◽  
Kazuo Umezaki ◽  
Hiroyuki Mizuno ◽  
Yoji Kawamoto ◽  
...  
Keyword(s):  
Axial Loading ◽  
Stiffened Panels ◽  
Post Buckling

BUCKLING AND POST-BUCKLING OF ISOTROPIC AND COMPOSITE STIFFENED PANELS: A REVIEW ON OPTIMISATION (2000-2015)

2021 ◽  
Vol 158 (A3) ◽  
Author(s):  
X-Y Ni ◽  
B G Prusty ◽  
A K Hellier
Keyword(s):  
Critical Discussion ◽  
Loading Capacity ◽  
Light Weight ◽  
Structural Elements ◽  
Engineering Structures ◽  
Stiffened Panels ◽  
Post Buckling ◽  
Key Issues ◽  
Optimisation Techniques ◽  
Optimisation Algorithms

Stiffened panels made out of isotropic or anisotropic materials are being extensively used as structural elements for aircraft, maritime, and other structures. In order to maintain stiffness and strength with light weight, new design techniques must be employed when utilising these materials. Their stability, ultimate strength and loading capacity are the key issues pertaining to these engineering structures which have attracted a number of investigators to undertake in- depth research, either in an academic or actual engineering context. This paper presents a review of the optimisation techniques applied to buckling and post-buckling of stiffened panels. Papers published in the period from 2000 to May 2015 have been taken into consideration. The topic is addressed by identifying the most significant objectives, targets and issues, as well as the optimisation formulations, optimisation algorithms and models available. Finally a critical discussion, giving some practical advice and pointing out and post-buckling of stiffened panels, is provided. 

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