A topological optimization algorithm applied to the design of composites patch repair of mixed-mode cracked plate

2017 ◽  
Vol 52 (17) ◽  
pp. 2387-2395 ◽  
Author(s):  
Matías Braun ◽  
Edgardo Ignacio Villa ◽  
Helio Riojas-Roldán ◽  
Claudio Guillermo Rocco
Keyword(s):  
Finite Element ◽  
Topology Optimization ◽  
Optimization Algorithm ◽  
Mixed Mode ◽  
Topological Optimization ◽  
Patch Repair ◽  
Finite Element Code ◽  
Patch Shape ◽  
Composite Patch ◽  
Iterative Analysis

In this work, a topology optimization algorithm is developed and implemented to get an optimum composite patch shape. Typically, the design process consists of an iterative analysis, where the best solution is obtained from a comparative study. In this way, we propose a topology optimization algorithm applied to obtain the optimum composite patch shape. The algorithm is implemented in MatLab, and uses the commercial finite element code Abaqus/Standard. A numerical example is analysed to show the capability of the proposed method. The obtained results are compared with numerical results reported by other researchers, revealing the potential of the developed algorithm.

A Wing Structure Design Based on Topology Optimization

2014 ◽  
Vol 889-890 ◽  
pp. 272-276
Author(s):  
Gang Tong ◽  
Tong Fei Liu ◽  
Yang Chen Deng
Keyword(s):  
Finite Element ◽  
Topology Optimization ◽  
Key Words ◽  
Structure Design ◽  
Topological Optimization ◽  
Structure Topology ◽  
Wing Structure

Introduces the characteristics of topology optimization and bionics, proposes the steps and method of using MSC.Patran to establish the model of the wing structure topology optimization, and through to illustrate the feasibility of the method and the application value of the wing structure topology optimization and bionics design. Key words: topological optimization; wing structure; bionics design ;finite element; MSC Patran;MSC Nastran

Optimization of composite patch repair for maximum stability of crack growth in an aluminum plate

2016 ◽  
Vol 231 (20) ◽  
pp. 3690-3701
Author(s):  
B Talebi ◽  
A Abedian
Keyword(s):  
Finite Element ◽  
Crack Growth ◽  
Cohesive Zone Model ◽  
Adhesive Layer ◽  
Patch Repair ◽  
Aluminum Plate ◽  
Uniaxial Tensile ◽  
Zone Model ◽  
Composite Patch ◽  
The Stability

In this paper, the configuration parameters of pre-designed composite patch repair are optimized with the aim of achieving the highest level of stability of crack growth in aluminum in the presence of some constraints such as weight, load sustainability, shear stress in the adhesive layer and maximum stress in the patch. For this purpose, the patch is modeled in full scale by ABAQUS, a commercial finite element code. The crack growth process is simulated with the extended finite element method under uniaxial tensile loading, and the Cohesive Zone Model is used to model the progressive damage in the adhesive of the composite patch repair. Also, sensitivity analysis is performed on the configuration parameters and it is shown that three parameters, i.e. width, stiffness ratio, and height of the patch are more important. Nonlinear fracture mechanics concepts have been used in calculating the stability of crack in the cracked aluminum plate. The results show that optimization based on the method proposed in this paper causes the stability of crack growth to increase by 21% while the patch weight is reduced by 52%.

Topological Optimization on the Board which above Flexible Clamping Stent Fixture

2012 ◽  
Vol 482-484 ◽  
pp. 784-787
Author(s):  
Da Wei Wu ◽  
Jing Li ◽  
Chang Qing Su
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Topology Optimization ◽  
Design Method ◽  
Substantial Reduction ◽  
Topological Optimization ◽  
Original Design ◽  
Optimum Distribution ◽  
Element Analysis ◽  
Better Than

Topology optimization is a design method to seek an optimum distribution of material according to loading, restraint and objective. Topology optimization was carried out for board – finite element analysis is compared with the original design. The study shows that the stress which on the board was reduced to a great extent. The distribution of the stress was better than before .substantial reduction of quality achieves lightweight. It provides an important technical message for improvement design of the flexible clamping stent fixture.

Parametric investigation of one-sided composite patch efficiency for repairing crack in mixed mode considering different thicknesses of the main plate

2020 ◽  
Vol 54 (22) ◽  
pp. 3067-3079 ◽  
Author(s):  
Sirvan Mohammadi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mixed Mode ◽  
3D Finite Element ◽  
Parametric Investigation ◽  
Composite Patch ◽  
Mixed Mode Crack ◽  
Adhesive Thickness ◽  
3D Finite Element Method ◽  
Material Length

In this paper, parameters affecting the performance and durability of a one-sided composite patch for mixed-mode crack repairing is investigated, considering different thicknesses of the main plate. In different references, there is no unity of opinion on the effect of various parameters on the performance and durability of one-sided patches. In the present study, to eliminate this disagreement, 3D finite element method is employed. It is clear that the effect of each parameter strongly depends on the thickness of the repaired plate. Among the investigated parameters, the patch material, length and width of the patch, and adhesive thickness are more important and studied in this paper. Results reveal that the effect of different parameters on the performance and durability of one-sided patches depends not only on the thickness of the main plate but also on the patch material.

scholarly journals THE FINITE ELEMENT EVALUATION OF SUPPORT BRACKET USING THE APPLICATION OF TOPOLOGICAL OPTIMIZATION

2021 ◽  
Author(s):  
Letsatsi M.T. ◽  
◽  
Agarwal . A ◽  
Pitso I ◽  
◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Topology Optimization ◽  
Structural Analysis ◽  
3D Printing ◽  
Topological Optimization ◽  
Optimized Design ◽  
Weight Minimization ◽  
Design Software ◽  
Generic Design

The demand for customized products has increased to suite various needs which could be easily developed using 3D printing technology. Most of the products require optimization for weight minimization which could be done using topological optimization tool. Topology optimization offers conceptual design for lighter and stiffer structures and helps to reach to efficient and aesthetic designs in lesser time. Topological optimization has shown its effectiveness is in improving design of structures with the help of high configuration and fast computing processors. With the use of FEA, the topologically optimized design can be tested which enables to determine design feasibility for different loads and boundary conditions. The current research investigates the application of topological optimization tool in weight minimization of support bracket. The generic design of supporting bracket is developed in Creo design software and structural analysis is conducted using techniques of Finite Element Method. The topological optimization tool enabled to reduce nearly 32% mass without much increase in deformation and stresses. The increase in deformation was found to be 5.6% and is profound in the regions of cylindrical support structure.

scholarly journals The effect of disbond on the efficiency and durability of a composite patch repair in mode I and mixed mode considering different patch materials

2022 ◽  
Vol 30 ◽  
pp. 096739112110627
Author(s):  
Sirvan Mohammadi
Keyword(s):  
Growth Rate ◽  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Mixed Mode ◽  
Patch Repair ◽  
Mode I ◽  
Composite Patch ◽  
Repair Patch ◽  
The Mean ◽  
Patch Edge

In this paper, considering different parameters and various patch materials, the effect of disbond on the efficiency and durability of a composite patch repair is investigated in mode I and mixed-mode. One of the most important aspects of the composite patch repair is the bond strength. Repair patch disbond may occur at the patch edges or the crack site. At first, the effect of different parameters such as repair patch material and Young’s modulus and thickness of the adhesive on the efficiency and durability of the patch is investigated. Then, the effect of the disbond site on the stress intensity factor (patch efficiency) and adhesive stress (patch durability) is analyzed in both modes I and II. The results show that disbond at the crack site leads to a further reduction in patch efficiency compared to the patch edge disbond, but when separation occurs at the patch edge, the adhesive stress and the disbond growth rate are higher. Also, when 15% of the patch is separated in the crack site, for the longitudinal and transverse disbond modes, the mean KI is increased by 8 and 4%, respectively, compared to the state without disbond. Thus, the longitudinal disbond mode is more critical.

Numerical model for composite patch repair of notched aluminum plates under impact loading

2021 ◽  
pp. 146442072098337
Author(s):  
Umut Caliskan ◽  
Recep Ekici ◽  
Ayse Yildiz Bayazit ◽  
M Kemal Apalak
Keyword(s):  
Finite Element ◽  
Numerical Model ◽  
Composite Structures ◽  
Impact Damage ◽  
Damage Model ◽  
Three Dimensional ◽  
Patch Repair ◽  
Progressive Damage ◽  
Damage Models ◽  
Composite Patch

The damaged area for various structures can be effectively repaired using composite materials. With the effect of impact, damage can occur that cannot be clearly seen in the inner structure of a laminated composite. This can cause delamination and other damage modes in layered composite structures. In this study, three-dimensional dynamic progressive damage analysis was performed in adhesively bonded composite patch-repaired metal notched plates under impact loads to investigate the effect of external composite patch material and thickness. Three-dimensional Hashin damage models were used for the progressive damage model. A user-defined subroutine, VUMAT was written to transfer the damage models to finite element code. By writing a separate script in Python language that relates to the damage models, the weakness in the laminate of the composite patch was transferred to the finite element model with a different degradation model proposed. It was found that plastic deformations occurring after impact damage in the notched metal plates was prevented by the use of composite patches. While glass and carbon fiber exhibit similar behavior at lower impact velocities, the progress of damage is prevented by increasing patch thickness. These behaviors were confirmed by the numerical model and showed an advanced agreement with experimental results.

Composite Patch Repair of Structural Member by Coupled FE-EFG Approach

2016 ◽  
Vol 829 ◽  
pp. 78-82
Author(s):  
Himanshu Pathak ◽  
Akhilendra Singh ◽  
Indra Vir Singh
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Partition Of Unity ◽  
Patch Repair ◽  
Integral Approach ◽  
Fe Method ◽  
Material Interface ◽  
Composite Patch ◽  
Geometric Discontinuities ◽  
Element Free

This paper presents a simple and efficient coupled finite element-element free Galekrin (FE-EFG) approach to simulate three-dimensional composite patch repair problem. In coupled FE-EFG approach, extended element free Galerkin (XEFG) is used near the crack surface as it can accurately model the discontinuities while the rest of domain is approximated by standard finite element (FE) method. The transition between FE and XEFG was modelled by a ramp function. The geometric discontinuities like crack and material interface are modeled by adding enrichment functions in EFG displacement approximation through partition of unity (PU). The location of geometrical discontinuity is traced by vector level set method. A domain based J-integral approach is used for the evaluation of stress intensity factors.

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