Integrating Genetic Algorithms and the Finite Element Analysis for Structural Inverse Problems

2011 ◽  
pp. 136-146
Author(s):  
D. C. Panni ◽  
A. D. Nurse
Keyword(s):  
Finite Element ◽  
Genetic Algorithms ◽  
Inverse Problems ◽  
Static Loading ◽  
Composite Structures ◽  
Specific Reference ◽  
Element Analysis ◽  
The Third ◽  
The Finite Element Analysis ◽  
Physical Response

A general method for integrating genetic algorithms within a commercially available finite element (FE) package to solve a range of structural inverse problems is presented. The described method exploits a user-programmable interface to control the genetic algorithm from within the FE package. This general approach is presented with specific reference to three illustrative system identification problems. In two of these the aim is to deduce the damaged state of composite structures from a known physical response to a given static loading. In the third the manufactured lay-up of a composite component is designed using the proposed methodology.

Shell Finite Elements for the Analysis of Multifield Problems in Multilayered Composite Structures

2016 ◽  
Vol 828 ◽  
pp. 215-236 ◽  
Author(s):  
Maria Cinefra ◽  
Erasmo Carrera
Keyword(s):  
Finite Element ◽  
Composite Structures ◽  
Single Layer ◽  
Shell Element ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Multilayered Plates ◽  
Plates And Shells ◽  
Elasticity Solutions ◽  
Shell Finite Element

This paper deals with the analysis of layered structures under thermal and electro-mechanical loads. Constitutive equations for multifield are considered and the Principle of Virtual Displacements (PVD) is employed to derive the governing equations. The MITC9 shell finite element based on the Carrera's Unified Formulation (CUF) has been applied for the analysis. The models grouped in the CUF have variable through-the-thickness kinematic and they provide an accurate distribution of displacements and stresses along the thickness of the laminate. The shell element has nine nodes and the Mixed Interpolation of Tensorial Components (MITC) method is used to contrast the membrane and shear locking phenomenon. The finite element analysis of multilayered plates and shells has been addressed. Variable kinematics, as well as layer-wise and equivalent single layer descriptions, have been considered for the presented FEs, according to CUF. A few problems are analyzed to show the effectiveness of the proposed approach. Various laminations, thickness ratios and curvature ratios are considered. The results, obtained with different theories contained in the CUF, are compared with both the elasticity solutions given in literature and the analytical solutions obtained using the CUF and the Navier's method.

scholarly journals Considerations on the Evaluation and Management of Volumetric Surface Defects on Pipelines Using 3D Scanning and Finite Element Analysis

2020 ◽  
Vol 71 (4) ◽  
pp. 19-28
Author(s):  
Ionut Lambrescu ◽  
Alin Dinita ◽  
Mihail Minescu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Surface Defects ◽  
3D Scanning ◽  
Second Step ◽  
Element Analysis ◽  
The Third ◽  
Micro Cracks ◽  
The Finite Element Analysis ◽  
Original Approach

The paper proposes an original approach in the evaluation of the Volumetric Surface Defects (VSD) appearing in pipelines. The methodology we propose consists in performing, in the first phase, a superficial polishing (molding) of the VSD, such as the micro-cracks are eliminated. The second step implies 3D scanning of the molded VSD. The third step implies a comparative evaluation, using the Finite Element Analysis, of the pipeline with the polished VSD, and rectangular shaped machined VSDs. The comparative analysis will allow choosing the best scenario, both in terms of pipeline strength and economic efficiency (expressed in volume of the removed material).

Behaviour of the joint between slabs and walls composed of light steel and foam concrete

2021 ◽  
pp. 136943322110032
Author(s):  
Dianzhong Liu ◽  
Han Liu ◽  
Feipeng Zhang
Keyword(s):  
Finite Element ◽  
Composite Structures ◽  
Failure Process ◽  
Displacement Curve ◽  
Element Analysis ◽  
Static Test ◽  
The Finite Element Analysis ◽  
New Type ◽  
Load Displacement ◽  
Wall System

Aiming at the prefabricated composite structure, a new type of interior joint in the prefabricated slab wall system suitable for light steel-concrete composite structures is proposed. In the paper, the pseudo-static test of the joint was designed and carried out, and its failure pattern was mainly described. In addition, the test data was analysed from the perspectives of load-displacement curve, strength, stiffness, ductility and energy dissipation. The finite element analysis software ABAQUS was used to carry out finite element modelling and calculation of the new joint, and the results were compared and analysed in terms of failure process and load-displacement curve analysis. The results show that it is feasible to apply the joints in this new type of slab wall system to light steel concrete composite structures.

The Finite Element Analysis of Fatigue Performance of Precracked Concrete Beams Strengthened with Prestressed CFRP

2011 ◽  
Vol 250-253 ◽  
pp. 3320-3327
Author(s):  
Qing Song Li ◽  
Shao Ping Meng
Keyword(s):  
Finite Element ◽  
Static Loading ◽  
Concrete Beams ◽  
Fem Analysis ◽  
Fatigue Performance ◽  
Fatigue Properties ◽  
Analysis Model ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Before And After

The research conducts the numerical analysis of the fatigue performance of precracked concrete beams strengthened with prestressed CFRP, establishing the static analysis model (SM) and fatigue analysis model (FM) respectively, examining the change of the static loading and fatigue performance before and after CFRP strengthens precracked concrete beams in the different prestressed situations, and analyzing the relevant fatigue performance parameters through comparing FEM analysis with experimental results. The research results demonstrate that the method of strengthening concrete beams with prestressed CFRP can improve the static loading and fatigue performance; the increased rate of fatigue performance of precracked concrete beams is parallel to the CFRP prestress; the fatigue life of precracked concrete beams increases with the raising of the CFRP prestress; FEM analysis is in close agreement with experiment results; the fatigue properties of precracked concrete beams strengthened with prestressed CFRP can be analyzed effectively by the finite element method.

The Finite Element Analysis of Axle Housing

2014 ◽  
Vol 707 ◽  
pp. 309-312
Author(s):  
Pei Ming Zhang ◽  
Le Qun Ma ◽  
Wei Chun Zhang
Keyword(s):  
Boundary Condition ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Modal Analysis ◽  
Static Analysis ◽  
Element Analysis ◽  
The Third ◽  
The Finite Element Analysis ◽  
Nature Frequency ◽  
Vibration Performance

Firstly, a model is established in Pro/E and imported into ANSYS. Static analysis is done through imposed corresponding boundary condition and loads in the condition of fully load. And then, testing its strength can meet the requirements. At the same time, the modal analysis of the third to the tenth steps is carried out and gets the nature frequency under the driving axle housing’s Free State. The vibration performance is analyzed at last.

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