FEM Analysis of the Ultimate Strength of Aluminum Stiffened Panels With Fixed and Floating Transverse Frames

2015 ◽  
Author(s):  
Chenfeng Li ◽  
Huilong Ren ◽  
Zhiyao Zhu ◽  
Carlos Guedes Soares
Keyword(s):  
Aluminum Alloy ◽  
Residual Stresses ◽  
Ultimate Strength ◽  
Fem Analysis ◽  
Simulation Method ◽  
Tensile Tests ◽  
Stiffened Panels ◽  
New Type ◽  
Aluminum Panels ◽  
Positive Effect

The aim of this study was to analyze the ultimate strength of stiffened aluminum panels by the non-linear finite element method. A new type of stiffened aluminum alloy panel has been designed which has fixed longitudinal and alternating floating transverse frames. Based on material tensile tests, the material properties of the aluminum alloy were obtained. Then, the simulation method of welding residual stresses and the effect of heat-affected zone are investigated. The FEA software ABAQUS V6.11 is used to estimate the ultimate strength of these stiffened panels under axial compression. The results show that: 1) The mechanical imperfections have significant effect on ultimate strength of stiffened panels; 2) residual stresses may have positive effect on ultimate strength; 3) the new stiffened panels also have good performance on ultimate bearing capacities.

Finite Element Analysis of the Ultimate Strength of Aluminum-Stiffened Panels With Fixed and Floating Transverse Frames

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Chenfeng Li ◽  
Zhiyao Zhu ◽  
Huilong Ren ◽  
C. Guedes Soares
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Residual Stresses ◽  
Ultimate Strength ◽  
Simulation Method ◽  
Tensile Tests ◽  
Element Analysis ◽  
Stiffened Panels ◽  
Aluminum Panels

The aim of this study was to analyze the ultimate strength of stiffened aluminum panels by the nonlinear finite element method. A new type of stiffened aluminum alloy panel has been designed, which has fixed longitudinal and alternating floating transverse frames. Based on material tensile tests, the material properties of the aluminum alloy were obtained. Then, the simulation method of welding residual stresses and the effect of heat-affected zone (HAZ) are investigated. The finite element analysis (FEA) software abaqus V6.11 is used to estimate the ultimate strength of these stiffened panels under axial compression. The results show that: (1) the mechanical imperfections have significant effect on the ultimate strength of stiffened panels; (2) residual stresses may have positive effect on the ultimate strength; and (3) the new stiffened panels also have good performance on ultimate bearing capacities.

Ultimate Strength of Dented Narrow Stiffened Panels Subjected to Compressive Loads

2012 ◽  
Author(s):  
Mingcai Xu ◽  
C. Guedes Soares
Keyword(s):  
Ultimate Strength ◽  
Compressive Load ◽  
Tensile Tests ◽  
Nonlinear Fem ◽  
Element Analysis ◽  
Stiffened Panels ◽  
Geometry Model ◽  
The Finite Element Analysis ◽  
Compressive Loads ◽  
Local Dent

This paper investigates the collapse behaviour of stiffened panels with a local dent under axial compressive load. The damage on plates is simulated by quasi-static nonlinear FEM, which accounts for the residual stresses caused by a dent and the springback of the stiffened panels. The material properties used in the finite element analysis have been evaluated by tensile tests. To prescribe appropriate boundary conditions, extended stiffened panels with three bays models are adopted in FE analyses. The resistance of the stiffened panels to denting is analyzed first. The effects of residual stress, geometry model and dent depth of stiffened panels on the ultimate strength and the springback of the stiffened panels are analyzed.

Test and FEM Analysis on a New Type of Anti-Wind Device

2012 ◽  
Vol 268-270 ◽  
pp. 697-701
Author(s):  
Chao Yong Shen ◽  
Yu Hong Ma ◽  
Min Hui Zhou
Keyword(s):  
Ultimate Strength ◽  
Seismic Design ◽  
Fem Analysis ◽  
Scale Model ◽  
Design Calculation ◽  
Test Results ◽  
Calculation Results ◽  
New Type ◽  
Intermediate Section

A new type of anti-wind device was put forward. 1/4 scale model about it had been tested and analyzed by FEM. Comparison of FEM, design calculation results with test results also had been done.Test and FEM results show the intermediate section will be the most weakness part, no matter that it is on the condition of in-plane load or out-plane load. During the stage of anti-wind design, it is safe for the FEM, design calculation results in which the standard strength of material is used, but at the stage of seismic design, the ultimate strength of anti-wind device should be considered in order to assure the anti-wind device to damage while earthquake happens.

Regularities and properties of instrumented indentation diagrams obtained by ball-shaped indenter

2020 ◽  
Vol 86 (5) ◽  
pp. 43-51
Author(s):  
V. M. Matyunin ◽  
A. Yu. Marchenkov ◽  
N. Abusaif ◽  
P. V. Volkov ◽  
D. A. Zhgut
Keyword(s):  
Yield Strength ◽  
Ultimate Strength ◽  
Elastoplastic Deformation ◽  
Elastic Limit ◽  
Tensile Tests ◽  
Indentation Load ◽  
International Standards ◽  
Instrumented Indentation ◽  
Indentation Methods ◽  
Special Points

The history of appearance and the current state of instrumented indentation are briefly described. It is noted that the materials instrumented indentation methods using a pyramid and ball indenters are actively developing and are currently regulated by several Russian and international standards. These standards provide formulas for calculating the Young’s modulus and hardness at maximum indentation load. Instrumented indentation diagrams «load F – displacement α» of a ball indenter for metallic materials were investigated. The special points on the instrumented indentation diagrams «F – α» loading curves in the area of elastic into elastoplastic deformation transition, and in the area of stable elastoplastic deformation are revealed. A loading curve area with the load above which the dF/dα begins to decrease is analyzed. A technique is proposed for converting «F – α» diagrams to «unrestored Brinell hardness HBt – relative unrestored indent depth t/R» diagrams. The elastic and elastoplastic areas of «HBt – t/R» diagrams are described by equations obtained analytically and experimentally. The materials strain hardening parameters during ball indentation in the area of elastoplastic and plastic deformation are proposed. The similarity of «HBt – t/R» indentation diagram with the «stress σ – strain δ» tensile diagrams containing common zones and points is shown. Methods have been developed for determining hardness at the elastic limit, hardness at the yield strength, and hardness at the ultimate strength by instrumented indentation with the equations for their calculation. Experiments on structural materials with different mechanical properties were carried out by instrumented indentation. The values of hardness at the elastic limit, hardness at the yield strength and hardness at the ultimate strength are determined. It is concluded that the correlations between the elastic limit and hardness at the elastic limit, yield strength and hardness at the yield strength, ultimate tensile strength and hardness at the ultimate strength is more justified, since the listed mechanical characteristics are determined by the common special points of indentation diagrams and tensile tests diagrams.

The Formability and Elongation of Aluminum Alloys AA5083 and AA3003 for Micro-Truss Sandwiches Manufacturing

2020 ◽  
Vol 38 (9A) ◽  
pp. 1396-1405
Author(s):  
Arwa F. Tawfeeq ◽  
Matthew R. Barnett
Keyword(s):  
Aluminum Alloy ◽  
Strain Rate ◽  
Cost Effective ◽  
Tensile Tests ◽  
Truss Structures ◽  
High Quality ◽  
Trade Off ◽  
Clad Layer ◽  
Higher Temperature ◽  
Different Shapes

The development in the manufacturing of micro-truss structures has demonstrated the effectiveness of brazing for assembling these sandwiches, which opens new opportunities for cost-effective and high-quality truss manufacturing. An evolving idea in micro-truss manufacturing is the possibility of forming these structures in different shapes with the aid of elevated temperature. This work investigates the formability and elongation of aluminum alloy sheets typically used for micro-truss manufacturing, namely AA5083 and AA3003. Tensile tests were performed at a temperature in the range of 25-500 ○C and strain rate in the range of 2x10-4 -10-2 s-1. The results showed that the clad layer in AA3003 exhibited an insignificant effect on the formability and elongation of AA3003. The formability of the two alloys was improved significantly with values of m as high as 0.4 and 0.13 for AA5083 and AA3003 at 500 °C. While the elongation of both AA5083 and AA3003 was improved at a higher temperature, the elongation of AA5083 was inversely related to strain rate. It was concluded that the higher the temperature is the better the formability and elongation of the two alloys but at the expense of work hardening. This suggests a trade-off situation between formability and strength. 

scholarly journals FEM Analysis of Spring-backs in Age Forming of Aluminum Alloy Plates

2007 ◽  
Vol 20 (6) ◽  
pp. 564-569 ◽  
Author(s):  
Huang Lina ◽  
Wan Mina ◽  
Chi Cailoub ◽  
Ji Xiushengb
Keyword(s):  
Aluminum Alloy ◽  
Fem Analysis

The influence of tool flank wear on residual stresses induced by milling aluminum alloy

2009 ◽  
Vol 209 (9) ◽  
pp. 4502-4508 ◽  
Author(s):  
Z.T. Tang ◽  
Z.Q. Liu ◽  
Y.Z. Pan ◽  
Y. Wan ◽  
X. Ai
Keyword(s):  
Aluminum Alloy ◽  
Residual Stresses ◽  
Flank Wear ◽  
Tool Flank Wear
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