Experimental and numerical investigation in failure of cracked aluminum plates repaired with bonded FML composite patch, under impact loading

2014 ◽  
Vol 21 (4) ◽  
pp. 493-503
Author(s):  
Lotfali Mozafari Vanani ◽  
Hamed Moayeri Kashani ◽  
Ali Pourkamali Anaraki ◽  
Faramarz Ashenai Ghasemi
Keyword(s):  
Energy Absorption ◽  
Metal Layer ◽  
Three Dimensional ◽  
Charpy Impact ◽  
J Integral ◽  
Element Analysis ◽  
Composite Patch ◽  
Crack Propagation Direction ◽  
Surface Method ◽  
Aluminum Plates

AbstractIn this paper, Charpy impact tests were conducted on cracked aluminum plates repaired with FML composite patches. The effects of the crack characteristics and patch lay-up sequence on the energy absorption of the specimens were investigated experimentally. In order to reduce the test numbers, the design of experiments method was used, and the results were predicted by response surface method. The effect of repairing on the fracture parameters [stress intensity factor (SIF), J-integral, and crack propagation direction (CPD)] at the crack front was calculated using three-dimensional (3D) finite element analysis. The results show that the value of the energy absorption increases when the crack angle increases and that the patch lay-up sequence has a significant role on the efficiency of the repair. When the location of the metal layer of the patch is near the repaired surface of the specimen, the value of the energy absorption increases.

Charpy Impact Response of the Cracked Aluminum Plates Repaired with FML Patches using the Response Surface Methodology

2016 ◽  
Vol 66 (5) ◽  
pp. 536
Author(s):  
Faramarz Ashenai Ghasemi ◽  
Lotfali Mozaffari Vanani ◽  
Ali Pourkamali Anaraki ◽  
Sadigh Raissi
Keyword(s):  
Response Surface Methodology ◽  
Crack Length ◽  
Response Surface ◽  
Energy Absorption ◽  
Charpy Impact ◽  
Experimental Results ◽  
Impact Response ◽  
Crack Angle ◽  
Aluminum Plates ◽  
The Impact

<p style="margin: 0cm 0cm 10pt; text-align: justify; line-height: normal;">Here, the effect of fiber metal laminate (FMLs) patches was studied for repairing of single-sided cracked aluminum plates experimentally to see their response to Charpy impact tests. The main desired parameters were composite patch lay-up, crack length, and crack angle each one in three levels. All experimental attempts generated and followed based on the design of experiments method by using of response surface methodology. The predicted energy absorption values obtained from the model were in good agreement with the experimental results. No matter the specimens were repaired or not, as the crack length was increased the energy absorption of the structure was decreased. The experimental results also showed that for lengthen cracks, increasing of the crack angle had more effect on energy absorption. Also it was observed that the patch lay-up effective on the impact response of the specimens. The more the metal layer was departed from the aluminum plate and the FML patches interfacial surface, the less energy was absorbed in the structure.</p>

scholarly journals Optimization of Initial Folding Square Sections for the Crashworthiness Design

2018 ◽  
Vol 11 (1) ◽  
pp. 25
Author(s):  
M Yoggaraj Muthusamy ◽  
Kamaruddin Kamaruddin ◽  
Moch. Agus Choiron
Keyword(s):  
Finite Element Analysis ◽  
Computer Simulation ◽  
Finite Element ◽  
Energy Absorption ◽  
Deformation Mode ◽  
Element Analysis ◽  
Surface Method ◽  
Crashworthiness Design ◽  
Simulation Results ◽  
Energy Absorbing

In this study, crash behavior of optimization of initial folding square sections are evaluated. Three parameters of design are set as width (w), height (h) and thickness (t) with three levels. Deformation mode of crash box and energy absorbing due to frontal load is observed.  Response surface method is used to optimize the Initial folding square sections. Box-Bhenken is chosen to provide this setting and 13 models is built. Computer simulation is used to determine the energy absorption by using Software Finite Element Analysis. Based on computer simulation results, it can be denoted that w =1.1 mm, h = 0.9 mm and t = 2.75 mm produce the highest of energy absorption. 

Application of the Calculator Technique in the Ability about the MMCs of the Anti-Vibration

2010 ◽  
Vol 150-151 ◽  
pp. 1693-1696
Author(s):  
Hui Ting Gao ◽  
Song He Meng ◽  
Zhan Yi Cao ◽  
Li Na Xu
Keyword(s):  
Finite Element ◽  
Metal Layer ◽  
Three Dimensional ◽  
Element Analysis ◽  
Dissipation Energy ◽  
Finite Element Software ◽  
Layer Composite ◽  
Dimensional Finite Element ◽  
New Material ◽  
Three Dimensional Finite Element

According to the dissipation energy principles of plastic Three-dimensional finite element analysis of antiseismic capability of Fe/Zn composite by the finite element software ANSYS. It is the very first time to study responds process of earthquake of metal layer composite. Observed in “Time Hist Postpro” that biggest stress of Fe is lower than the yield intensity of Fe, the biggest stress of Zn is bigger than the yield intensity, Fe supports load and Zn absorbs energy are proved. It is provided to the theories for the system of the new material according to.

Fatigue crack propagation in aluminum plates with composite patch including plasticity effect

2017 ◽  
Vol 232 (11) ◽  
pp. 2122-2131 ◽  
Author(s):  
A Albedah ◽  
Sohail MA Khan ◽  
B Bachir Bouiadjra ◽  
F Benyahia
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Load Ratio ◽  
J Integral ◽  
Electron Microscopic ◽  
Composite Patch ◽  
Aa 2024 ◽  
Aluminum Plates

In this paper, we analyzed experimentally and numerically the behavior of fatigue crack in aluminum plates repaired with bonded composite patch. We studied the behavior of repaired crack in AA 2024 T3 and AA 7075 T6 under two levels of applied fatigue stresses: maximal stresses of 70 and 120 MPa at a load ratio of 0.1. In the experimental part, the fatigue life of unrepaired and repaired notched specimens were determined. In the numerical part, the J integral around repaired and unrepaired crack tips was calculated. The numerical and the experimental results were used to plot the crack velocity (da/dN) as a function of the J integral. The analysis was completed with scanning electron microscopic observations on fracture surfaces of repaired and unrepaired specimens. It was found that patch improves the fatigue life but this improvement is considerably reduced with the increase in the applied fatigue load. The Al 2024 T3 presents better resistance to fatigue crack propagation in both repaired and unrepaired cases.

scholarly journals Two - Dimensional Finite Element Analysis of Composite Patch Repairs Using Shell Laminate Elements

2003 ◽  
Vol 12 (2) ◽  
pp. 096369350301200
Author(s):  
George J Tsamasphyros ◽  
George N Kanderakis ◽  
Nikos K Furnarakis ◽  
Zaira P Marioli-Riga
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Element Analysis ◽  
Composite Patch ◽  
Out Of Plane ◽  
Dimensional Finite Element ◽  
Patch Repairs ◽  
Three Dimensional Finite Element

A host of one and two-sided composite patch reinforcements of metallic structures with different patch thickness were considered, in order to compare two-dimensional finite element analysis using shell laminate elements with three-dimensional finite element analysis. In order to verify the accuracy of this approach a parametric study has been performed and the 2D results were compared to the outcome of the corresponding three-dimensional finite element analysis, which accuracy has been experimentally verified in previous works. It was found that for the case of two-sided reinforcement the results obtained by the two methods were in very good agreement. For the case of one-sided reinforcement some deviation of the results of two-dimensional analysis has been observed, which was due to the tendency of the structure for out-of-plane bending, resulting from the bonding of a reinforcing patch to only one face of the structure. According to the results of this parametric study and since most aircraft structures are constrained against local out-of-plane bending (e.g. aircraft skins through stringers) two-dimensional finite elements analysis using shell laminate elements is proposed as an accurate and easy to use analysis tool for the design of both one and two-sided composite patch repairs of relatively simple structures.

Design and Optimization of Piezoelectric Fans for Cooling of Microelectronic Devices

2007 ◽  
Vol 4 (3) ◽  
pp. 121-129 ◽  
Author(s):  
Maram Venkata Ramana ◽  
Indra Putra Almanar ◽  
Mohd Zulkifly Abdullah ◽  
Zaidi Mohd Ripin ◽  
K.N. Seetaramu
Keyword(s):  
Neural Networks ◽  
Finite Element ◽  
Metal Layer ◽  
Damping Ratio ◽  
Back Propagation ◽  
Three Dimensional ◽  
Element Analysis ◽  
Design And Optimization ◽  
Hidden Layer ◽  
Piezoelectric Fans

Static, modal, and dynamic finite element analyses have been performed for cantilever piezoelectric fans to understand their mechanical behavior and to aid in design-optimization studies. Three-dimensional analysis was carried out by using the finite element analysis software package, ANSYS. Various parameters—like length, thickness, location of the piezoelectric metal layer, temperature, damping ratio, and electric field—have been considered. The effects of these parameters on the vibration characteristics and performance are investigated and consolidated through artificial neural networks. Feed-forward single hidden layer perceptron neural networks and Levenberg–Marquardt back-propagation (LMBP) algorithms are used to train the neural network. Optimal geometrical dimensions for maximum performance are then obtained using genetic algorithms.

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