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Auteur : Grafiati
Publié le 4 mai 2024

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1

Cho, Keong Hwan, Jin Hyeok Joo, Jung Heum Lee, Je Hoon Oh et Dong Hyuck Kam. « Comparative Study of Joint Performance According to Joining Methods Between Al7075-T6 and SPFC590DP for Lightweight Car Body ». Journal of Welding and Joining 39, no 5 (30 octobre 2021) : 497–504. http://dx.doi.org/10.5781/jwj.2021.39.5.5.

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The necessity of dissimilar joining between aluminum alloy and steel is increasing in order to meet the demand for weight reduction in automobiles. However, dissimilar joining between 7000 series aluminum alloy and steel is challenging with mechanical joining methods such as self-piercing rivet(SPR) and flow drill screw(FDS) without hole processing. In this study, mechanical performances of dissimilar joints between 3 mm thick Al7075-T6 and 1 mm thick SPFC590DP were evaluated for use in lightweight B-pillar assembly. Self-Piercing Rivet(SPR) and Flow Drill Screw(FDS) with one-hole processing, bolt/nut and blind rivet with two-hole processing and adhesive bonding were compared with respect to joint performance. In SPR joining, rivet did not penetrate and rivet buckling occurred in the rivet due to the thickness and high strength of the Al7075-T6. By processing pre-hole on Al7075-T6 and applying an additional Al5052-H32 sheet to induce mechanical interlock in SPR joint, it became possible to join Al7075-T6 to SPFC590DP with an SPR. The tensile shear load of the SPR joint was 9.8 kN. In FDS joining, it is also necessary to process pre-hole on Al7075-T6 since the fastener could not penetrate the Al7075-T6. The tensile shear load of the FDS joining was 8.1 kN. In bolt/nut and blind rivet joining, the tensile shear load were measured respectively 11.1 kN and 5.2 kN. In adhesive bonding with 1K glue, the tensile shear load was measured 18.5 kN when the interfacial surface was roughened with a sand paper.
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Nama, Hamza A. H. Abo, İsmail Esen, Hayrettin Ahlatcı et Volkan Karakurt. « Effect of Aging Heat Treatment on Wear Behavior and Microstructure Characterization of Newly Developed Al7075+Ti Alloys ». Materials 16, no 12 (15 juin 2023) : 4413. http://dx.doi.org/10.3390/ma16124413.

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In this study, Al7075+0%Ti-, Al7075+2%Ti-, Al7075+4%Ti-, and Al7075+8%Ti-reinforced alloys were prepared by melting processes using Al7075 and Al-10%Ti main alloys. All newly produced alloys were subjected to T6 aging heat treatment and some samples were cold rolled at 5% beforehand. The microstructure, mechanical behavior, and dry-wear behavior of the new alloys were examined. Dry-wear tests of all alloys were carried out at a total sliding distance of 1000 m, at a sliding speed of 0.1 m/s, and under a load of 20 N. In the hardness measured after T6 aging heat treatment, the peak hardness of the Al7075+0%Ti-, Al7075+2%Ti-, Al7075+4%Ti-, and Al7075+8%Ti-reinforced alloys was found to be 105.63, 113.60, 122.44, and 140.41 HB, respectively. The secondary phases formed by the addition of Ti to the Al7075 alloy acted as precipitate-nucleation sites during aging heat treatment, further increasing the peak hardness. Compared to the peak hardness of the unrolled Al7075+0%Ti alloy, the increase in the peak hardness of the unrolled and rolled Al7075+8%Ti-reinforced alloys was 34% and 47%, respectively, and this difference in the increase was due to the change in the dislocation density with cold deformation. According to the dry-wear test results, the wear resistance of the Al7075 alloy increased by 108.5% with a reinforcement of 8% Ti. This result can be attributed to the formation of Al, Mg, and Ti-based oxide films during wear, as well as the precipitation hardening, the secondary hardening with acicular and spherical Al3Ti phases, the grain refinement, and solid-solution-hardening mechanisms.
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Balanou, Maria, Lazaros-Emmanouil Papazoglou, Angelos P. Markopoulos et Panagiotis Karmiris-Obratański. « EXPERIMENTAL INVESTIGATION OF SURFACE TOPOGRAPHY OF AL7075-T6 ALLOY MACHINED BY EDM ». Cutting & ; Tools in Technological System, no 94 (16 juin 2021) : 3–10. http://dx.doi.org/10.20998/2078-7405.2021.94.01.

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Electrical discharge machining is one of the most important non-conventional machining processes for removing material from electrically conductive materials by the use of controlled electric discharges. EDM is a non-contact machining process, therefore, is free from mechanical stresses. This paper investigates the machining Al7075-T6 alloy by EDM using a copper electrode. Al7075-T6 alloy was selected, because of its growing use in a lot of engineering applications. The effect of electrical parameters, peak current and pulse-on time, on the surface integrity, was studied. Area surface roughness parameters (arithmetical mean height, Sa, and maximum height, Sz) were measured on all samples and 3D surface characterization has been carried out with confocal laser scanning microscopy. The experimental results showed that the surface roughness is mainly affected by the pulse-on time.
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Hassan, Muhammad Hafiz, Jamaluddin Abdullah et Gérald Franz. « Multi-Objective Optimization in Single-Shot Drilling of CFRP/Al Stacks Using Customized Twist Drill ». Materials 15, no 5 (7 mars 2022) : 1981. http://dx.doi.org/10.3390/ma15051981.

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In recent years, the use of CFRP with titanium and/or aluminum to form materials for stacking has gained popularity for aircraft construction. In practice, single-shot drilling is used to create perfectly aligned holes for the composite-metal stack. Usually, standard twist drills, which are commonly available from tool suppliers, are used for practical reasons. However, existing twist drill bits exhibit rapid wear upon the drilling of composite-metal stack layers in single shot, due to the widely contrasting properties of the composite-metal stack, which causes poor surface quality. The stringent quality requirements for aircraft component manufacturing demands frequent drill bit replacement and thus incurs additional costs, a concern still unresolved for aircraft component manufacturers. Owing to highly contrasting properties of a composite-metal stack, it is obvious that standard twist drill cannot fulfil the rigorous drilling requirements, as it is pushed to the limit for the fabrication of high-quality, defect-free holes. In this work, customised twist drills of a tungsten carbide (WC) material with different geometric features were specially fabricated and tested. Twenty drill bits with customised geometries of varying chisel edge angle (30–45°), primary clearance angle (6–8°), and point angle (130–140°) were fabricated. The stacked-up materials used in this study was CFRP and aluminum alloy 7075-T6 (Al7075-T6) with a total thickness of 3.587 mm. This study aims to investigate the effect of twist drill geometry on hole quality using drilling thrust force signature as indicator. All drilling experiments were performed at spindle speed of 2600 rev/min and feed rate of 0.05 mm/rev. Design of experiments utilising response surface methodology (RSM) method was used to construct the experimental array. Analysis of variance (ANOVA) was used to study the effect of parameters and their significance to the thrust force and thus the hole quality. The study shows that the most significant parameter affecting the drilling thrust force and hole surface roughness is primary clearance angle, followed by chisel edge angle. Correlation models of CFRP thrust force (Y1), Al7075-T6 thrust force (Y2), CFRP hole surface roughness (Y3), Al7075-T6 hole surface roughness (Y4) as a function of the tool geometry were established. The results indicated that the proposed correlation models could be used to predict the performance indicators within the limit of factors investigated. The optimum twist drill geometry was established at 45° of chisel edge angle, 7° of primary clearance angle, and 130° of point angle for the drilling of CFRP/Al7075-T6 stack material in a single-shot process. The error between the predicted and actual experiment values was between 6.64% and 8.17% for the optimum drill geometry. The results from this work contribute new knowledge to drilling thrust force signature and hole quality in the single-shot drilling of composite-metal stacks and, specifically, could be used as a practical guideline for the single-shot drilling of CFRP/Al7075-T6 stack for aircraft manufacturing.
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5

Chen, Wen-Jong, Chuan-Kuei Huang, Qi-Zheng Yang et Yin-Liang Yang. « OPTIMAL PREDICTION AND DESIGN OF SURFACE ROUGHNESS FOR CNC TURNING OF AL7075-T6 BY USING THE TAGUCHI HYBRID QPSO ALGORITHM ». Transactions of the Canadian Society for Mechanical Engineering 40, no 5 (décembre 2016) : 883–95. http://dx.doi.org/10.1139/tcsme-2016-0072.

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This paper combines the Taguchi-based response surface methodology (RSM) with a multi-objective hybrid quantum-behaved particle swarm optimization (MOHQPSO) to predict the optimal surface roughness of Al7075-T6 workpiece through a CNC turning machining. First, the Taguchi orthogonal array L27 (36) was applied to determine the crucial cutting parameters: feed rate, tool relief angle, and cutting depth. Subsequently, the RSM was used to construct the predictive models of surface roughness (Ra, Rmax, and Rz). Finally, the MOHQPSO with mutation was used to determine the optimal roughness and cutting conditions. The results show that, compared with the non-optimization, Taguchi and classical multi-objective particle swarm optimization methods (MOPSO), the roughness Ra using MOHQPSO along the Pareto optimal solution are improved by 68.24, 59.31 and 33.80%, respectively. This reveals that the predictive models established can improve the machining quality in CNC turning of Al7075-T6.
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Abraham, D. S. Manoj, H. Kanagasabapathy, S. Kartheesan et M. C. Shaji. « Dry Sliding Wear Behaviour of Al 7075 T6 Coated by Plasma Spray Process ». Advanced Materials Research 984-985 (juillet 2014) : 551–56. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.551.

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-Al7075 T6 alloys are widely used in the aircraft, automotive and die and mold making industry, yet at any time aluminium components should be designed with a third body or in an harsh environment they must be protected with an overlying coating inorder to increase their useful lifespan and improve their surface performance especially in wear and corrosion. The most wide spread technique used to modify the surface properties of Al7075 T6 among them one of the most promosing technology is plasma spraying. It is widely used to manufacture anti-wear and anti-corrosion coatings on to a large class of bulk materials. Extreme performance and high flexibility are the Main characteristic of the coatings achievable by Plasma Spray process. In this work Nickel Carbide + Chromium Composite coating was successfully prepared and deposied with various thicknesses on the Aluminium alloy surface. Nickel Carbide + Chromium composite coating exhibits a significantly increased wear resistance property in the material. The result obtained in this work indicated that the plasma spraying method will be the promising process to coat the composite coating on aluminium based alloy.Keywords: Al 7075 T6, Plasma Spray Process, Nickel Carbide + Chromium
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7

Abhinav, Rahul Ribeiro et Rajul Raghav. « Elasto-Visco behavior of Al7075-T6 using a numerical technique ». IOP SciNotes 1, no 2 (29 août 2020) : 024401. http://dx.doi.org/10.1088/2633-1357/ababe9.

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Milković, Marijana, Denis Đonlagić et Nenad Gubeljak. « Change of Residual Stress due Surface Conditions of Al7075-T6 ». Procedia Structural Integrity 13 (2018) : 1861–66. http://dx.doi.org/10.1016/j.prostr.2018.12.328.

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9

Majzoobi, G. H., R. Hojjati et M. Soori. « Fretting fatigue behavior of Al7075-T6 at sub-zero temperature ». Tribology International 44, no 11 (octobre 2011) : 1443–51. http://dx.doi.org/10.1016/j.triboint.2011.03.021.

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10

Hasnan, Khalid, Qadir Bakhsh, Bhagwan Das, Aftab Ahmed et Aqeel Ahmed. « Stress Analysis of Switchover Module with Al6061-T6 and Al7075-T6 for Hybrid Locomotion Mobile Robot ». MATEC Web of Conferences 59 (2016) : 05002. http://dx.doi.org/10.1051/matecconf/20165905002.

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11

Kumar, Sanjay, et Vikrant Tiwari. « Study the Effect of Pulse Shaper on Dynamic Compressive Behavior of AL2014-T6 and AL7075-T6 ». International Journal of Advance Research and Innovation 4, no 1 (2016) : 243–47. http://dx.doi.org/10.51976/ijari.411635.

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Three point bend set up is used to evaluate load and load point displacement on specimen during dynamic condition. Here, experiments have been conducted on Al 6063 alloys on Modified Hopkinson Pressure Bar (MHPB) in dynamic condition. The cylinder pressure and striker velocity was measured during experiments and it was 3.1 bar and 24m/s respectively. The strain gauges, data acquisition computer were used to measure strain at two points at Hopkinson bar. The load point displacement and load are obtained by the two point strain measurement methods and one dimensional wave theory in terms of strains measured experimentally at two points.
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12

Jeong, Seong-Gyun, et Tae-Hyeong Kim. « A Study on the Optimum Shot Peening Condition for Al7075-T6 ». Journal of the Korean Society for Aeronautical & ; Space Sciences 31, no 7 (1 septembre 2003) : 63–68. http://dx.doi.org/10.5139/jksas.2003.31.7.063.

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13

Bai, Xupeng, Yongming Yao, Zhiwu Han, Junqiu Zhang et Shuaijun Zhang. « Study of Solid Particle Erosion on Helicopter Rotor Blades Surfaces ». Applied Sciences 10, no 3 (3 février 2020) : 977. http://dx.doi.org/10.3390/app10030977.

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In this study, titanium alloy (Ti-4Al-1.5Mn), magnesium alloy (Mg-Li9-A3-Zn3), or aluminum alloy (Al7075-T6) were used to construct the shell model of helicopter rotor blade to study the solid particle erosion of helicopter rotor blades. The erosion resistance of the three materials at different angles of attack (6°, 3°, or 0°) and particle collision speeds (70, 150, or 220 m/s) was examined using the finite volume method, the discrete phase method, and erosion models. In addition, the leading edge of the helicopter blades was coated with two types of bionic anti-erosion coating layers (V- and VC-type), in an attempt to improve erosion resistance at the angles of attack and particle collision speeds given above. The results showed that Ti-4Al-1.5Mn had the best erosion resistance at high speed, followed by Al7075-T6 and Mg-Li9-A3-Zn3. The angle of attack appeared to affect only the surface area of the blade erosion, while the erosion rate was not affected. Finally, the results of this article showed that the V-type bionic coating had better erosion resistance than the VC-type coating at the same impact speeds. The angle of attack did not have a significant effect on the erosion rate of the bionic coating.
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14

Hassan, Muhammad Hafiz, Jamaluddin Abdullah, Gérald Franz, Chim Yi Shen et Reza Mahmoodian. « Effect of Twist Drill Geometry and Drilling Parameters on Hole Quality in Single-Shot Drilling of CFRP/Al7075-T6 Composite Stack ». Journal of Composites Science 5, no 7 (17 juillet 2021) : 189. http://dx.doi.org/10.3390/jcs5070189.

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Drilling two different materials in a layer, or stack-up, is being practiced widely in the aerospace industry to minimize critical dimension mismatch and error in the subsequent assembly process, but the compatibility of the drill to compensate the widely differing properties of composite is still a major challenge to the industry. In this paper, the effect of customized twist drill geometry and drilling parameters are being investigated based on the thrust force signature generated during the drilling of CFRP/Al7075-T6. Based on ANOVA, it is found that the maximum thrust force for both CFRP and Al7075-T6 are highly dependent on the feed rate. Through the analysis of maximum thrust force, supported by hole diameter error, hole surface roughness, and chip formation, it is found that the optimum tool parameters selection includes a helix angle of 30°, primary clearance angle of 6°, point angle of 130°, chisel edge angle of 30°, speed of 2600 rev/min and feed rate of 0.05 mm/rev. The optimum parameters obtained in this study are benchmarked against existing industry practice of the capability to produce higher hole quality and efficiency, which is set at 2600 rev/min for speed and 0.1 mm/rev for feed rate.
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Yoon, Han Ki. « Influence of Fiber Orientation and Volume Fraction on Tensile Strength and Fatigue Life of CARALL Hybrid Composite ». Key Engineering Materials 353-358 (septembre 2007) : 1455–58. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1455.

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In this paper the tensile and fatigue life tests of carbon fiber-reinforced epoxy prepreg (CFRP) were conducted in order to investigate the influence of volume ratio and fiber orientation. CFRP/Al7075 laminate hybrid composite (CARALL) consists of alternating Al7075-T6 sheets and carbon epoxy prepreg (epoxy 121oC #2560). The fiber orientations of CFRP were applied to the extent of 0/90° and ±45°. The CFRP layers are 1ply, 3plies and 5plies in case of 0/90°, and 1ply and 2plies in case of ±45° of carbon fiber direction, respectively. The tensile strength decreased with the volume ratio of CFRP in both the cases of fiber orientation 0/90° and ±45°. The fatigue life is lower in large volume ratio of CFRP than in small volume ratio in both the cases of fiber orientation 0/90° and ±45°.
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Hojjati Talemi, R., M. Soori, M. Abdel Wahab et Patrick De Baets. « Experimental and numerical investigation into effect of elevated temperature on fretting fatigue behavior ». International Journal Sustainable Construction & ; Design 2, no 1 (6 novembre 2011) : 2–11. http://dx.doi.org/10.21825/scad.v2i1.20429.

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t Fretting fatigue damage occurs in contacting parts when they are subjected to fluctuating loadingsand sliding movements at the same time. This phenomenon may occur in many applications such asbearings/ shafts, bolted and riveted connections, steel cables, and steam and gas turbines. In this paper,the effect of elevated temperature on fretting fatigue life of Al7075-T6 is investigated using a new device forfretting fatigue tests with variable crank shaft mechanism. Also a finite element modeling method was usedto estimate crack propagation lifetime in aluminum alloy, Al7075-T6 specimens at elevated temperatureunder fretting condition. In this method, shear and normal stresses that are caused by contact load areupdated at each crack growth increment. Finally, a comparison between the experimental and numericalresults is done in order to evaluate the FE simulation.Department of mechanical engineering, Islamic Azad University, Takestan Branch, Takestan, IranThe experimental results show that: (i) fretting fatigue life of the material increases with temperature up to350°C by 180% for low stresses and decreases by 40% for high stresses, (ii) this fashion of variation offretting fatigue life versus temperature is believed to be due to degradation of material properties whichoccurs by overaging and wear resistance increase due to oxidation of aluminum alloy. While overaginggives rise to degradation of mechanical strength of material and hence the reduction of its fretting fatiguelife, surface oxidation of the specimens brings some improvement of fatigue behavior of the material.Metallurgical examination of the specimens reveals that temperature results in precipitation of impurities ofal-7075-T6. The size of precipitated impurities and their distances gets bigger as temperature increases.This could be a reason for material degradation of specimens which are exposed to heating for longer timeduration.
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Tzotzis, Anastasios, Angelos P. Markopoulos, Nikolaos E. Karkalos, Dimitrios Tzetzis et Panagiotis Kyratsis. « FEM based investigation on thrust force and torque during Al7075-T6 drilling ». IOP Conference Series : Materials Science and Engineering 1037, no 1 (1 février 2021) : 012009. http://dx.doi.org/10.1088/1757-899x/1037/1/012009.

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Chun, Se-Ho. « Correlation between Surface Roughness and Vibration in Slot Milling of AL7075-T6 ». Korean Society of Manufacturing Process Engineers 21, no 5 (30 mai 2022) : 61–66. http://dx.doi.org/10.14775/ksmpe.2022.21.05.061.

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Xu, Honghe, Yue Zhang, Ruitao Peng, Linwei Zhu et Yan Lu. « Simulation and experimental study on the strength of Al7075-T6 clinched joint ». Engineering Failure Analysis 129 (novembre 2021) : 105735. http://dx.doi.org/10.1016/j.engfailanal.2021.105735.

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Lim, Hak Jin, Jeong Kyu Oh, Pyeong Ho Kim, Jong Hwan Lee et Jeong Suk Kim. « Estimation of Machinability Turning Process for Al7075-T6 by Cryogenic Heat Treatment ». Journal of manufacturing engineering & ; technology 22, no 5 (15 octobre 2013) : 865–70. http://dx.doi.org/10.7735/ksmte.2013.22.5.865.

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Tzotzis, Anastasios, Angelos Markopoulos, Nikolaos Karkalos et Panagiotis Kyratsis. « 3D finite element analysis of Al7075-T6 drilling with coated solid tooling ». MATEC Web of Conferences 318 (2020) : 01038. http://dx.doi.org/10.1051/matecconf/202031801038.

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Due to the fact that simulation of drilling was added in commercial finite element analysis (FEA) software only recently, 3D finite element modelling is an invaluable asset during related researches. The present study employs 3D FEA to model the drilling process of Al7075-T6 alloy with solid carbide tooling, investigates important phenomena that occur during drilling and finally compares the simulated results with experimental data. A number of simulations were performed with DEFORM3D™ software at different cutting conditions; cutting speed of 50m/min, 100m/min, 150m/min and feed of 0.15mm/rev, 0.20mm/rev, 0.25mm/rev. The proposed model takes into consideration certain aspects like damage initiation and evolution of the material, contact interface between the drill bit and the workpiece and standard boundary conditions. Eventually, the acquired numerical data for thrust force were compared to the experimental results for the same cutting conditions and parameters. To obtain the experimental data, a series of nine drilling tests were performed. Upon validation of the numerical data, the temperature distribution on the tool tip – workpiece interface, as well as the chip morphology (shape and curling radius) were determined. Results showed a good agreement between the numerical and the experimental data. Specifically, thrust force and chip morphology exhibited an agreement of about 95% and 90% respectively, which confirms the potential of 3D FEA implementation on machining investigations.
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Tzotzis, Anastasios, César García-Hernández, José-Luis Huertas-Talón et Panagiotis Kyratsis. « FEM based mathematical modelling of thrust force during drilling of Al7075-T6 ». Mechanics & ; Industry 21, no 4 (2020) : 415. http://dx.doi.org/10.1051/meca/2020046.

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Like most machining processes, drilling is affected by many parameters such as the tool diameter, the cutting speed and feed. The current research investigates the possibility of developing a finite element modelling based prediction model for the generated thrust force during drilling of Al7075-T6 with solid carbide tools. A total of 27 drilling experiments were carried out in order to examine the interaction between three key parameters and their effect on thrust force. In addition, simulations of the experiments were realized with the use of DEFORM3D™ software in order to obtain the necessary numerical data. Finally, a comparison was made between the experimental and the numerical results to verify that reliable modelling is feasible. The mathematical model was acquired with the use of response surface methodology and the verification of the adequacy of the model was performed through an analysis of variance. The majority of the simulations yielded results in agreement with the experimental results at around 95% and the derived model offered an accuracy of 5.9%.
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魏, 雨希. « Effect of Milling Residual Stress on Stress Corrosion of Al7075-T6 Alloy ». Modeling and Simulation 12, no 03 (2023) : 2141–51. http://dx.doi.org/10.12677/mos.2023.123196.

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Pittalà, Gaetano M., et Stefano Linguanotto. « A study of machinability of Al7075-T6 with solid carbide end mills ». Procedia CIRP 115 (2022) : 148–53. http://dx.doi.org/10.1016/j.procir.2022.10.065.

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Cinar Cagan, Suleyman, et Dr Berat Baris Buldum. « Investigation of the Effect of Different Working Mediums on Turning Al7075-T6 Alloy ». International Journal of Engineering Research and Advanced Technology 4, no 12 (2018) : 01–07. http://dx.doi.org/10.31695/ijerat.2018.3347.

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Mohseni, E., E. Zalnezhad, Ahmed A. D. Sarhan et A. R. Bushroa. « A Study on Surface Modification of Al7075-T6 Alloy against Fretting Fatigue Phenomenon ». Advances in Materials Science and Engineering 2014 (2014) : 1–17. http://dx.doi.org/10.1155/2014/474723.

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Aircraft engines, fuselage, automobile parts, and energy saving strategies in general have promoted the interest and research in the field of lightweight materials, typically on alloys based on aluminum. Aluminum alloy itself does not have suitable wear resistance; therefore, it is necessary to enhance surface properties for practical applications, particularly when aluminum is in contact with other parts. Fretting fatigue phenomenon occurs when two surfaces are in contact with each other and one or both parts are subjected to cyclic load. Fretting drastically decreases the fatigue life of materials. Therefore, investigating the fretting fatigue life of materials is an important subject. Applying surface modification methods is anticipated to be a supreme solution to gradually decreasing fretting damage. In this paper, the authors would like to review methods employed so far to diminish the effect of fretting on the fatigue life of Al7075-T6 alloy. The methods include deep rolling, shot peening, laser shock peening, and thin film hard coatings. The surface coatings techniques are comprising physical vapor deposition (PVD), hard anodizing, ion-beam-enhanced deposition (IBED), and nitriding.
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AFGHAHI, Seyyed Salman Seyyed, Aliakbar EKRAMI, Saeed FARAHANY et Amirreza JAHANGIRI. « Fatigue properties of temperature gradient transient liquid phase diffusion bonded Al7075-T6 alloy ». Transactions of Nonferrous Metals Society of China 25, no 4 (avril 2015) : 1073–79. http://dx.doi.org/10.1016/s1003-6326(15)63700-1.

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Joy Mathavan, Jebaratnam, Muhammad Hafiz Hassan, Jinyang Xu et Gérald Franz. « Hole Quality Observation in Single-Shot Drilling of CFRP/Al7075-T6 Composite Metal Stacks Using Customized Twist Drill Design ». Journal of Composites Science 6, no 12 (8 décembre 2022) : 378. http://dx.doi.org/10.3390/jcs6120378.

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In the modern aircraft manufacturing industry, the use of fiber metal stack-up material plays an important role. During assembly, these stack-up materials need to be drilled, and single-shot drilling is the best option to avoid misalignments. This paper discusses hole quality in terms of hole edge defects and hole integrity with respect to tool geometry. In this study, tungsten carbide (WC) twist-type drills with various geometric features were fabricated, tested, and evaluated. Twenty custom twist drill bits with primary clearance angles ranging from 6° to 8°, chisel edge angles from 30° to 45°, and point angles from 130° to 140° were fabricated. The CFRP and Al 7075-T6 were stacked up, and a feed rate of 0.05 mm/rev and spindle speed of 2600 rev/min were used for all drilling experiments. The experimental array was constructed using response surface methodology (RSM) to design the experiments. The impact of factors and their importance on hole quality were investigated using analysis of variance (ANOVA). The study demonstrates that the primary clearance angle, followed by the chisel edge angle, is the most important factor determining hole quality. As a function of tool geometry, correlation models between exit delamination and burr height were developed. The findings suggested that, within the range of parameters examined, the proposed correlation models might be utilized to predict performance measures. For drilling CFRP/AL7075-T6 stack material in a single shot, the ideal twist drill geometry was determined to be a 45° chisel edge angle, 8° primary clearance angle, and 130° point angle. For optimum drill geometry, the discrepancy between the expected and actual experiment values was 0.11% for exit delamination and 9.72% for burr height. The findings of this research elucidate the relationship between tool geometry and hole quality in single-shot drilling of composite-metal stacks, and more specifically, they may serve as a useful, practical guide for single-shot drilling of CFRP/Al7075-T6 stack for the manufacture of aircraft.
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Aslantas, Kubilay, Ahmet Hascelik et Adem Çiçek. « Performance evaluation of DLC and NCD coatings in micro-milling of Al7075-T6 alloy ». Journal of Manufacturing Processes 81 (septembre 2022) : 976–90. http://dx.doi.org/10.1016/j.jmapro.2022.07.053.

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Vasu, Ch, Atul Thaware, Gaurav Tiwari et Ravikumar Dumpala. « Experimental and numerical analysis of orthogonal cutting of high strength aluminium alloy Al7075-T6 ». IOP Conference Series : Materials Science and Engineering 1185, no 1 (1 septembre 2021) : 012010. http://dx.doi.org/10.1088/1757-899x/1185/1/012010.

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Kim, Hyoung Tae, et Ki Hoon Shin. « Relationship between Feedrate and Fatigue Life of Al7075-T6 Specimens before and after Shotpeening ». Materials Science Forum 580-582 (juin 2008) : 109–12. http://dx.doi.org/10.4028/www.scientific.net/msf.580-582.109.

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This paper presents a study on the relationship between feedrate and fatigue life of Al7075-T6 specimens before and after shotpeening. For this purpose, six groups of specimens, each of which consists of eight specimens, were first machined at six different feedrates (0.05, 0.10, 0.15, 0.20, 0.25, 0.30 mm/rev). Half of eight specimens in each group were then peened and the others remained un-peened. Next, the fatigue life was measured by using 4-point rotary bending machine. One observation was that the fast the feedrate was, the large the mean diameter of a specimen was. To apply the same bending stresses in all cases, different loading conditions were thus recalculated and applied to specimens based on their mean diameters. Finally, the effect of feedrate on the fatigue life was estimated by comparing twelve sets of specimens (six groups times two sets, peened and un-peened).
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Ravi Kumar, D. V., Seenappa, V. Ravi Kumar et C. R. Prakash Rao. « Influence of T6-heat treatment on mechanical properties of Al7075 alloy reinforced with Cenosphere ». Materials Today : Proceedings 5, no 11 (2018) : 25036–44. http://dx.doi.org/10.1016/j.matpr.2018.10.304.

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Majzoobi, G. H., et A. R. Ahmadkhani. « The effects of multiple re-shot peening on fretting fatigue behavior of Al7075-T6 ». Surface and Coatings Technology 205, no 1 (septembre 2010) : 102–9. http://dx.doi.org/10.1016/j.surfcoat.2010.06.014.

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Zalnezhad, E., et Ahmed A. D. Sarhan. « Multilayer thin film CrN coating on aerospace AL7075-T6 alloy for surface integrity enhancement ». International Journal of Advanced Manufacturing Technology 72, no 9-12 (juin 2014) : 1491–502. http://dx.doi.org/10.1007/s00170-014-5757-z.

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35

Ucun, İrfan. « 3D finite element modelling of drilling process of Al7075-T6 alloy and experimental validation ». Journal of Mechanical Science and Technology 30, no 4 (avril 2016) : 1843–50. http://dx.doi.org/10.1007/s12206-016-0341-0.

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Habib, Numan, Aamer Sharif, Aqib Hussain, Muhammad Aamir, Khaled Giasin, Danil Yurievich Pimenov et Umair Ali. « Analysis of Hole Quality and Chips Formation in the Dry Drilling Process of Al7075-T6 ». Metals 11, no 6 (29 mai 2021) : 891. http://dx.doi.org/10.3390/met11060891.

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Millions of holes are produced in many industries where efficient drilling is considered the key factor in their success. High-quality holes are possible with the proper selection of drilling process parameters, appropriate tools, and machine setup. This paper deals with the effects of drilling parameters such as spindle speed and feed rate on the chips analysis and the hole quality like surface roughness, hole size, circularity, and burr formation. Al7075-T6 alloy, commonly used in the aerospace industry, was used for the drilling process, and the dry drilling experiments were performed using high-speed steel drill bits. Results have shown that surface roughness decreased with the increase in spindle speed and increased with the increase in the feed rate. The hole size increased with the high spindle speed, whereas the impact of spindle speed on circularity error was found insignificant. Furthermore, short and segmented chips were achieved at a high feed rate and low spindle speed. The percentage contribution of each input parameter on the output drilling parameters was evaluated using analysis of variance (ANOVA).
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More, Pramod S., et Dr Y. U. Sathe. « Optimization of CO2 Laser Cutting Process Parameter for AL7075-T6 Sheet Using Response Surface Methodology ». International Journal for Research in Applied Science and Engineering Technology 10, no 4 (30 avril 2022) : 239–44. http://dx.doi.org/10.22214/ijraset.2022.41176.

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Abstract: Aluminium alloys are used in the aerospace and automotive industries because of their light weight and excellent corrosion resistance. Since aluminium material has highly reflective and thermally conductive in nature, it is difficult to apply laser cut on it. The cut quality is mainly determined by the combination of the laser processing parameters. Surface roughness, cutting width and cutting cone were the most important quality indices for evaluating CO2 laser cutting, and the processing parameters considered were laser power, speed and gas pressure. For analysing the laser cutting variables and to determine the optimal value for the surface roughness mainly three approaches are used - Design of Experiments (DOE), Analysis of Variance (ANOVA), and Response Surface Methodology (RSM). The analysis in proposed work shows that the pressure has a greater influence on the response behaviour than the cutting speed and the laser power. In proposed work, the optimized values for above mentioned parameters are calculated for laser cutting process.
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Oh, Sung-Hun, Yong-Sung Lee et Seong-Kyun Cheong. « Effects of Re-Peening on the Compressive Residual Stress and Fatigue Life of Al7075-T6 ». Journal of the Korean Society of Manufacturing Technology Engineers 25, no 4 (15 août 2016) : 253–57. http://dx.doi.org/10.7735/ksmte.2016.25.4.253.

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Zalnezhad, E., Ahmed A. D. Sarhan et M. Hamdi. « Investigating the fretting fatigue life of thin film titanium nitride coated aerospace Al7075-T6 alloy ». Materials Science and Engineering : A 559 (janvier 2013) : 436–46. http://dx.doi.org/10.1016/j.msea.2012.08.123.

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Mehran, Q. M., A. R. Bushroa, M. A. Fazal et M. M. Quazi. « Scratch adhesion characteristics of PVD Cr/CrAlN multilayer coating deposited on aerospace AL7075-T6 alloy ». Pigment & ; Resin Technology 44, no 6 (2 novembre 2015) : 364–70. http://dx.doi.org/10.1108/prt-09-2014-0081.

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Purpose – The purpose of this study is to design and develop a new functional coating system for aerospace AL7075-T6 alloy that would evaluate the mechanical properties of the coating. Design/methodology/approach – This paper outlines the scratch adhesion characterisation of Cr/CrAlN coating using a combination of radio frequency (RF) and direct current (DC) physical vapour deposition (PVD) magnetron sputtering. The surface morphology, microstructure and chemical composition of the Cr/CrAlN film were evaluated by optical microscopy (OM), field emission scanning electron microscopy (FESEM) integrated with energy-dispersive X-Ray spectroscopy (EDX) and atomic force microscopy (AFM). The film-to-substrate adhesion was measured by a scratch test machine manufactured with a detection system, motorized stages, penetration depth sensors, optical microscope and tangential frictional load sensors. Findings – The AFM and ultra-micro hardness results showed an increase in surface roughness to about 20 per cent and hardness to about 74 per cent. Moreover, the film-to-substrate adhesion strength of 1,814 mN was obtained with PVD deposition process. Research limitations/implications – The main limitation of this work is caused by PVD deposition process. Besides, surface defects such as pinholes contribute to a decrease in adhesion strength. Practical implications – The higher hardness of CrAlN coating is used to improve the properties of softer aluminium substrates. This hardness prevents ploughing-induced wear and provides greater adhesion strength by preventing coating delamination. Originality/value – Until now, CrAlN is coated only on ferrous alloys. It has not yet been tried on aluminium alloys. Moreover, coating functionality depends on higher adhesion and failure mechanisms involved in the film-to-substrate system, which is significant in aerospace applications.
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Dosta, S., M. Couto et J. M. Guilemany. « Cold spray deposition of a WC-25Co cermet onto Al7075-T6 and carbon steel substrates ». Acta Materialia 61, no 2 (janvier 2013) : 643–52. http://dx.doi.org/10.1016/j.actamat.2012.10.011.

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Carpinteri, Andrea, et Roberto Brighenti. « Fracture and fatigue properties of metallic alloys S275 J2 and Al7075 T6 at low temperatures ». Journal of Materials Science 43, no 14 (juillet 2008) : 4780–88. http://dx.doi.org/10.1007/s10853-008-2675-1.

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Guagliano, Mario, Sara Bagherifard, Ines Fernàndez Parienete et Ramin Ghelichi. « Effects of Severe Air Blast Shot Peening on Microstructure and Residual Stress State of Al Alloys ». Key Engineering Materials 417-418 (octobre 2009) : 393–96. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.393.

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Surface grain refinement is a relatively new process aimed to enhance mechanical material properties. In this study Al7075-T6 bars have been shot peened with parameters much different from those of conventional shot peening. Microstructure gradient has been observed by means of transmission electron microscopy (TEM), X-ray diffraction (XRD) and nano indentation tester. A fine grained layer was found on top surface of the specimens. Measurements indicate of notable improvements in cases of hardness and elastic modulus in comparison with untreated material. XRD results also show significant depth affected both in terms of residual stress and FWHM. The results imply that using optimized shot peening parameters, it would be possible to create a fine grained layer on surface of component and consequently increase fatigue life and any other property affected by grain size.
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SHIM, SUNG-YONG, DAE-HWAN KIM, YOUNG-ROCK SUNG, IN-SHUP AHN et SU-GUN LIM. « THE EXPENDING RETROGRESSION TIME OF HOT-EXTRUDED Sc-CONTAINING Al–Zn–Mg–Cu ALLOY ». Surface Review and Letters 17, no 03 (juin 2010) : 293–98. http://dx.doi.org/10.1142/s0218625x10013734.

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In this paper, the retrogression and reaging (RRA) behavior and corrosion properties of Sc -containing Al–Zn–Mg–Cu alloy were observed. The dependence of the mechanical properties and corrosion resistance on the heat treatment condition was measured by hardness, tensile, C-ring and conductivity testing. The retrogression time for recovery of the yield strength of the alloy subjected to T6 treatment was 20 min at 200°C of retrogression temperature, which was longer than that of Al7075 alloy. The results of electrical conductivity and C-ring tests showed that the stress corrosion cracking (SCC) resistance in Sc -containing alloy treated for 20 min at 200°C was improved. These study results demonstrated the ability of the Sc -containing alloy to extend the retrogression time and thereby improve the SCC resistance and mechanical properties.
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Zhou, Menghua, Yinghua Chen et Guoqing Zhang. « Force Prediction and Cutting-Parameter Optimization in Micro-Milling Al7075-T6 Based on Response Surface Method ». Micromachines 11, no 8 (11 août 2020) : 766. http://dx.doi.org/10.3390/mi11080766.

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Optimization of cutting parameters in micro-milling is an important measure to improve surface quality and machining efficiency of the workpiece. Investigation of micro-milling forces prediction plays a positive role in improving machining capacity. To predict micro-milling forces and optimize micro-milling cutting parameters (per-feed tooth (fz), axial cutting depth (ap), spindle speed (n) and tool extended length (l)), a rotatable center composite experiment of micro-milling straight micro-groove in the workpiece of Al7075-T6 were designed, based on second-order response surface methods. According to the experiment results, the least square method was used to estimate the regression coefficient corresponding to the cutting parameters. Simultaneously, the response prediction model of micro-milling was established and successfully coincide the predicted values with the experiment values. The significance of the regression equation was tested by analysis of variance, and the influence of micro-milling cutting parameters on force and top burrs morphology was studied. The experiment results show that in a specific range of cutting parameters, ap and fz have a significant linear relation with the micro-milling force and the top burrs width. According to the optimal response value, the optimized cutting parameters for micro-milling obtained as: n is 11,393 r/min, fz is 6 µm/z, ap is 11 μm and l is 20.8 mm. The research results provide a useful reference for the selection of cutting parameters for micro-milling.
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Zalnezhad, Erfan, Ahmed Aly Diaa Mohammed Sarhan et Mohd Hamdi. « Prediction of TiN coating adhesion strength on aerospace AL7075-T6 alloy using fuzzy rule based system ». International Journal of Precision Engineering and Manufacturing 13, no 8 (7 juillet 2012) : 1453–59. http://dx.doi.org/10.1007/s12541-012-0191-3.

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Zalnezhad, Erfan, Ahmed Aly Diaa Mohammed Sarhan et Mohd Hamdi. « Surface hardness prediction of CrN thin film coating on AL7075-T6 alloy using fuzzy logic system ». International Journal of Precision Engineering and Manufacturing 14, no 3 (mars 2013) : 467–73. http://dx.doi.org/10.1007/s12541-013-0063-5.

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Majzoobi, G. H., et F. Abbasi. « An Investigation into the Effect of Normal Load Frequency on Fretting Fatigue Behavior of Al7075-T6 ». Tribology Transactions 61, no 3 (12 décembre 2017) : 547–59. http://dx.doi.org/10.1080/10402004.2017.1371366.

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Ali, M. A. N., R. A. Hussein et H. A. Hussein. « Numerical Thermo-Mechanical Strength Analysis of an IC Engine Component ». International Journal of Applied Mechanics and Engineering 26, no 3 (26 août 2021) : 1–11. http://dx.doi.org/10.2478/ijame-2021-0031.

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Abstract This research investigates a thermo-mechanical strength of three geometrical shape designs of an internal combustion (IC) engine piston by a finite element analysis (FEA). FEA was performed using Solidworks software for modelling geometrical piston designs, and the models were imported into ANSYS software for thermo-mechanical fatigue simulation. The work focused on predicting high stress intensity and indicated the fatigue critical regions and life of the piston shape design. AL7075-T6 aluminium alloy was used as a piston material and thermo-mechanical fatigue simulation was conducted based on the experimental stress-number of cycles recorded data from literature. Analytical results showed the similarity of the critical failure positions to some real failures in the IC engine piston, and the shape design modification of the piston. Hence, this concept can be used to satisfy the IC engine design needs at low cost.
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Saffar, Saber, et Hamid Eslami. « Increasing the fatigue life and surface improvement of AL7075 alloy T6 by using ultrasonic ball burnishing process ». International Journal of Surface Science and Engineering 16, no 3 (2022) : 181. http://dx.doi.org/10.1504/ijsurfse.2022.125438.

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