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Letteratura scientifica selezionata sul tema "Aluminum alloys. Mechanical engineering. Testing"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 12 febbraio 2022

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Articoli di riviste sul tema "Aluminum alloys. Mechanical engineering. Testing"

Sharapova, Dinaida M., Mikhail G. Sharapov e Nikolay I. Sharonov. "Structure Formation of Butt Joints Made of Aluminum Alloys to Ensure the Quality of Mechanical Engineering Products". Materials Science Forum 1022 (febbraio 2021): 119–26. http://dx.doi.org/10.4028/www.scientific.net/msf.1022.119.

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The article discusses the problems of ensuring high-quality formation and normative properties of butt joints of the 1560M and 1980T1 (AMg6 and B48) aluminum alloys as applied to engineering. A method is proposed for joining materials by means of EBW using an electron beam sweep. Homogeneous and dissimilar joints have been investigated, heat treatment of joint from the 1980T1 alloy and a dissimilar joint from the 1560M + 1980T1 alloys is recommended. The paper also presents the results of mechanical properties testing, the corrosion resistance and the delayed fracture tests. A welding technology that makes it possible to obtain high-quality butt-welded joints from aluminum alloys in thicknesses up to 40 mm has been developed and implemented.

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Petersen, DR, RE Link, H. Shi, AJ McLaren, CM Sellars, R. Shahani e R. Bolingbroke. "Hot Plane Strain Compression Testing of Aluminum Alloys". Journal of Testing and Evaluation 25, n. 1 (1997): 61. http://dx.doi.org/10.1520/jte11326j.

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JOPEK, MIROSLAV, MILAN FOREJT e MARTIN HARANT. "MECHANICAL PROPERTIES OF ALUMINIUM ALLOYS AT HIGH STRAIN RATE". MM Science Journal 2021, n. 2 (2 giugno 2021): 4505–11. http://dx.doi.org/10.17973/mmsj.2021_6_2021050.

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The split Hopkinson's pressure bar test is a part of a group of testing methods used to determine dynamic behavior of various materials in an interval of strain rate from 100 s-1 to 103 s-1. The article describes the practical application of the testing method for aluminum alloy EN AW 6082. This alloy is used for cold-extruded parts (components of car airbags). Since the strain rate of cold forming technologies reaches up to 1000 s-1, it is necessary to determine the material´s behavior at these strain rate values.

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Petersen, DR, RE Goforth e MN Srinivasan. "Testing the Superplastic Flow Characteristics of Advanced Aluminum Alloys". Journal of Testing and Evaluation 21, n. 1 (1993): 36. http://dx.doi.org/10.1520/jte11739j.

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DeGaspari, John. "Making the Most of Aluminum Scrap". Mechanical Engineering 121, n. 11 (1 novembre 1999): 71–73. http://dx.doi.org/10.1115/1.1999-nov-3.

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This article highlights features of a process under-development that aims to recover wrought alloys for high-value applications. Chemically etched wrought aluminum scrap pieces have been separated into their respective alloy families using an optical identification system that is being developed by Alcoa. The technique has successfully completed proof-of-concept testing at Pacific Northwest National laboratory. One method of separating the mix of wrought aluminum into its alloy families combines chemical etching with an optical technique to sort the aluminum by color. John Green, vice president of technology of The Aluminum Association, believes these technologies will give automotive companies an incentive to commit to aluminum for sheet applications by ensuring that recycling wrought aluminum into higher-value applications is feasible. According to an expert, since processing recycled aluminum takes only 5 percent of the energy required to work from primary ingot, using recycled aluminum makes sense for automobiles.

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Shi, De Quan, Zhi Wei Gao, Gui Li Gao, Xu Dong Wang e Hui Ying Tang. "Influence of Quenching Parameters on Mechanical Properties of 7075 Aluminum Alloy". Advanced Materials Research 217-218 (marzo 2011): 238–42. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.238.

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By using the universal mechanical testing machine and SEM, the influence of quenching parameters on the mechanical properties of 7075 aluminum alloy has been studied, and the optimal quenching parameters have been got. The experimental results show that the temperature range of the quenching treatment is too wide. However, the over-burning will occur when the temperature is above 490°C. So the optimal quenching temperature is from 465°C to 475°C. The water temperature and the transfer time are below 40°C and 30s, respectively. The time interval between the quenching and aging treatment is found to have little influence on the mechanical properties of 7075 aluminum alloys.

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Friedman, R., J. Kennedy e D. Royster. "Analysis and Compression Testing of 2024 and 8009 Aluminum Alloy Zee-Stiffened Panels". Journal of Engineering Materials and Technology 116, n. 2 (1 aprile 1994): 238–43. http://dx.doi.org/10.1115/1.2904279.

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Zee-stiffened compression test panels, fabricated with dispersion-strengthened, high-temperature 8009 aluminum alloy sheet, were evaluated to determine the alloy’s feasibility for compression-critical applications. A compression panel design configuration was obtained using a strength analysis program that predicts the post-skin buckling strength of flat or curved-skinned, metallic-stiffened structure. Three short-column panels were tested to failure at room temperature: (a) a baseline riveted panel fabricated with 2024-T62 aluminum zee stringers and a 2024-T81 aluminum skin, (b) a riveted panel fabricated with 8009 aluminum zee stringers and skin, and (c) a resistance spot-welded panel fabricated with 8009 aluminum zee stringers and skin. The 8009 alloy exhibited pronounced, compressive strength anisotropy, necessitating panel orientation to take advantage of the higher compressive yield in the sheet transverse direction. Compression test results were in good agreement with the predicted compression allowables since they were within 5 percent of the test strength. The 8009 aluminum riveted panel exhibited superior skin buckling resistance and failed in the wrinkling mode, as predicted, at a load approximately 15 percent higher than that of the baseline 2024 panel. The spotwelded 8009 panel did not fail in the wrinkling mode since the spot welds failed in tension shortly after the skin locally buckled. The latter test indicates that the spot welded skin-stringer combinations should not be used above the buckling stress. Due to its excellent microstructural stability at elevated temperatures, high-temperature compression panels of 8009 alloy offer potential weight savings of 25 percent compared with conventional aluminum alloys.

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Wang, Yuan Qing, Huan Xin Yuan e Yong Jiu Shi. "Mechanical and Fatigue Performance Tests of Cast Aluminum Alloy ZL111 Adopted in Structure". Advanced Materials Research 168-170 (dicembre 2010): 1961–69. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1961.

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Characteristics of aluminum alloys such as light weight, high strength-to-weight ratio and favorable corrosion resistance have brought about a bright application prospect in building structures. Wrought alloys are applicable to common beams and columns, while casting alloys can be fabricated as connectors in point-supported glass curtain wall and joints in spatial latticed structures on account of easy implement of moulding. Because of high strength, outstanding castability and remarkable mechanical properties after heat treatment, ZL111 in aluminum-silicon alloys is regarded as a desirable option. However, aluminum alloys are non-linear materials and their properties vary with casting and heat treatment modes. It is the well-marked distinction between aluminum alloy and ordinary carbon steel that special study on mechanical and fatigue performance is required. ZL111 raw materials were selected, with alloying agent and fabrication processes meeting the requirement of GB/T 1173-1995 standard. After T6 heat treatment process, test coupons were obtained by machining from raw materials. By utilization of electronic universal testing machine and cryogenic box, tensile tests at room temperature and low temperatures were performed. High-circle fatigue tests were carried out to obtain the fatigue performance of the material. Scanning electron microscope (SEM) was introduced to observe morphology of tensile and fatigue fractures. The tests revealed the relationship between mechanical property index and temperature, which indicated that the ZL111-T6 would increase in strength and plasticity. The microstructure of fractures validated and explained the macroscopic results. Furthermore, material strength at room temperature or low temperatures, stiffness and fatigue performance could satisfy bearing and normal serviceability requirement. Because of non existence of ductile-brittle transition temperature, superior corrosion resistance and outstanding castability, ZL111-T6 material is prone to fabricate complicated elements and joints withstanding cryogenic environment instead of carbon steel.

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Zaharia, I. I., e Virgil Geamăn. "Practical Aspects Regarding to Thixoforming Process Applied to Aluminum Alloys". Advanced Materials Research 23 (ottobre 2007): 161–64. http://dx.doi.org/10.4028/www.scientific.net/amr.23.161.

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The paper presents some experimental data about the thixoforming process applied to different aluminum alloys very used in the Romanian machine building industry. From many procedures for obtaining the semisolid slurry described in the paper, based on specialized literature [2, 3, 4] in particular, the accent is given to choose the mechanical mixture in the overheated mould until it reached the liquid alloy temperature. The main results are based on reducing of stirring time for increasing the benefits of the new technology. All procedures and results are described in the paper and also some specific conclusions are given. The experimental data of the research, were obtained in the specific testing laboratory from Transilvania University of Brasov.

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Masyrukan e Agung Setyo Darmawan. "Influence of Artificial Aging in Aluminum Silicon Alloy". Materials Science Forum 1029 (maggio 2021): 9–14. http://dx.doi.org/10.4028/www.scientific.net/msf.1029.9.

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One of the techniques to increase the hardness of aluminum alloy is by aging process. The aging process includes natural aging and artificial aging processes. This study aims to investigate the effect of artificial aging on the hardness of aluminum silicon alloys. Artificial aging is carried out at two temperature variations, namely 150 and 200 °C. Metallographic test using optical microscopy and scanning electron microscopy were performed to observe the microstructure and deposits of silicon. Investigation of the constituent elements of aluminum silicon was carried out using the Energy Dispersive X-Ray Spectroscopy technique. The mechanical properties of aluminum silicon alloys examined were hardness before aging and hardness after artificial aging at temperatures of 150 and 200 °C. Hardness testing is conducted by Rockwell B hardness testing. The hardness test results showed that the hardness before the aging process was 61.1 HRB, the hardness after artificial aging at 150 °C was 69.11 HRB and the hardness after artificial aging at 200 °C was 80.36 HRB. There was an increase in hardness after the artificial aging process was carried out.

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Tesi sul tema "Aluminum alloys. Mechanical engineering. Testing"

Tan, Kian Sing. "Dynamic loading characteristics in metals and composites". Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Dec/09Dec%5FTan_Kian_Sing.pdf.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, December 2009.
Thesis Advisor(s): Kwon, Young. Second Reader: Didoszak, Jarema. "December 2009." Description based on title screen as viewed on January 26, 2010. Author(s) subject terms: Tensile tests, Strain rate effects, Dynamic loading, Failure criterion. Includes bibliographical references (p. 37-38). Also available in print.

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Vu, Chinh Q. L. "Fatigue Characteristics of New ECO Series Aluminum 7175 Alloy". PDXScholar, 2019. https://pdxscholar.library.pdx.edu/open_access_etds/4985.

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In this dissertation, the fatigue characteristics of three newly developed experimental compositions for aluminum 7175, with improved mechanical strength, that uses magnesium-calcium alloy instead of pure magnesium are studied. Specimens of each variant were fabricated and subjected to fatigue life testing, fatigue life data analysis, and observation of their fracture characteristics through optical microscopy and scanning electron microscopy (SEM), and metallography to study their grains and surface characteristics. Fatigue life testing shows all three variants have a fatigue strength that is approaching approximately 200 MPa. ECO7175v3 is shown to have the highest fatigue strength of approximately 220 MPa at 5x107 cycles, approximately 40% of its tensile strength of 550 MPa. This is shown by its considerably higher fatigue strength coefficient determined by Basquin's equation compared to the other two variants. ECO7175v1 is shown to generally have large scatter in its fatigue life at higher stress levels (65% or higher of their tensile strength) with coefficient of variations typically twice or more to those of ECO7175v2 and ECO7175v3. The results of the SEM analysis shows that irrespective of the stress levels, ECO7175v1 and ECO7175v3 all have crack initiation points at the surface with no inclusions to act as stress concentrators. The lack of inclusions are supported by the reliability analysis which shows the hazard rates for all variants remains relatively constant the majority of the time before increasing towards the end. These trends for all variants indicates failures are due to wear-outs instead of defects, which were not seen. Reliability analysis also shows that at any given fatigue life cycle and stress level, ECO7175v3 has a lower probability of failure when compared to ECO7175v1 and ECO7175v2. On the other hand, at any given fatigue life cycle and stress level, ECO7175v1 is shown to have a higher probability of failure when compared to ECO7175v2 and ECO7175v3.

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Prabhakar, Vinay Kumar 1977. "Transient liquid-phase infiltration of aluminum alloys". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/89894.

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Lee, William Morgan. "Dynamic Microstructural Characterization of High Strength Aluminum Alloys". NCSU, 2008. http://www.lib.ncsu.edu/theses/available/etd-04302008-114019/.

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The use of aluminum alloys for commercial and military applications has increased substantially due to the alloysâ low areal density, toughness, and processability. It has recently been shown that an aluminum alloy, Al 2139, with copper, magnesium, and silver can be significantly toughened and strengthened by combinations of Î¸â and Î© precipitates and dispersed manganese particles. What has not been quantified are how these precipitates and dispersed particles affect behavior and what the material mechanisms and microstructural characteristics are that control the behavior of Al 2139 for strain-rates that span the quasi-static to high rates of strain. Hence, in this investigation, detailed transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), scanning electron microscopy (SEM), orientation imaging microscopy (OIM), and optical microscopy (OM) were used to delineate the different physical scales that range from the nano for the precipitates and dislocations to the micron for the dispersed particles, grain orientations and texture, grain-sizes, slip-bands, and grain-boundary orientations. The deformed specimens were from an Al 2139 plate that was impacted by 4340 steel fragmentation stimulating projectiles (FSPs) at impact velocities ranging from 813 to 1043 m/s. The majority of the projectiles were defeated by the Al 2139 plate, which is another indication of the alloyâs potential for damage mitigation and projectile defeat and resistance. Based on this detailed microstructural characterization, mechanisms for projectile defeat and full penetration are proposed. Deformation and damage modes include petalling on the impact face, shear cracking through the middle section of the plate due to projectile penetration, and discing due to bending stresses at a spall plane near the back of the plate. Shear cracking appears to be GB related, and the discing is dependent on the rolling direction. The extent of these modes for cross-sections where the target was penetrated was greater than that in regions where the projectile was defeated. For projectile defeat, large and elongated grains and precipitate deformation due to dislocation interaction can lead to highly ductile performance, which resists discing failure and plate penetration. Large grains significantly reduce the fraction of GBs, which then reduces the amount of GB cracking due to intense shear accumulation and spall. The elongation of the grains due to rolling also increased the dislocation densities, and subsequently the ductility of the grains, which reduced tensile failure due to the bending in the discing regions. High angle GBâs can also limit heterogeneous Î¸â precipitation at the GBâs, which would reduce intergranular fracture. Precipitation of Î© also increases the spall strength and decreases localized shear through its multiple cutting interactions with dislocations at the matrix interface. Dispersed particles also increase the strength of the alloy in high strain-rate applications by resisting localized shear. The results of this study are a first step in developing a tailored methodology that can be used to optimize microstructural characteristics and behavior of aluminum alloys for optimal strength and toughness.

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Sukesh, Shavinesh. "Production and characterization of aluminum alloys used for harvesting energy from the aluminum-water reaction". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83747.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 49).
Autonomous Underwater Vehicles (AUV) are heavily used by the military and in the industry for countless underwater tasks but currently have a limited mission time due to limitations in the energy density of their battery packs. Aluminum is an ideal energy source for AUVs because it exothermically reacts with water, producing hydrogen as one of its by-product, and it is two orders of magnitude more energy dense than lithium ion batteries. A method of using an aluminum-galinstan alloy was conceived to react with water where the presence of galinstan allows elemental aluminum to overcome the passivating aluminum oxide layer. The aluminum atoms reacts with water to produce heat and hydrogen at the grain boundaries with galinstan. This thesis attempts to develop a method of producing an aluminum-galinstan alloy. Several methods are explored to determine the most reliable method. Experiments were conducted to determine the percentage hydrogen yield to characterize the alloy.
by Shavinesh Sukesh.
S.B.

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Jordon, James Brian. "EXPERIMENTS AND MODELING OF FATIGUE AND FRACTURE OF ALUMINUM ALLOYS". MSSTATE, 2008. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11062008-110529/.

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In this work, understanding the microstructural effects of monotonic and cyclic failure of wrought 7075-T651 and cast A356 aluminum alloys were examined. In particular, the structure-property relations were quantified for the plasticity/damage model and two fatigue crack models. Several types of experiments were employed to adapt an internal state variable plasticity and damage model to the wrought alloy. The damage model was originally developed for cast alloys and thus, the model was modified to account for void nucleation, growth, and coalescence for a wrought alloy. In addition, fatigue experiments were employed to determine structure-property relations for the cast alloy. Based on microstructural analysis of the fracture surfaces, modifications to the microstructurally-based MultiStage fatigue model were implemented. Additionally, experimental fatigue crack results were used to calibrate FASTRAN, a fatigue life prediction code, to small fatigue-crack-growth behavior. Lastly, a set of experiments were employed to explore the damage history effect associated with cast and wrought alloys and to provide motivation for monotonic and fatigue modeling efforts.

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Paray, Florence. "Heat treatment and mechanical properties of aluminum-silicon modified alloys". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41146.

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The commercial applications of cast Al-Si alloys depend to an important extent on controlling the morphology of the eutectic silicon through thermal modification in the solid state and/or chemical modification of the melt before the production of the casting. The effects of modification and/or heat treatment on the microstructure and the mechanical properties of 356 alloy have been investigated on both permanent mold and sand cast samples. Strontium (0.02%) and sodium (0.01%) were used to produce well modified microstructures. The importance of the amount of modifier used was also examined in producing castings with 0.002% Sr and 0.08% Sr. Production parameters such as solution heat treatment time and artificial aging time were examined.
Microstructural assessment was done by quantitative metallography using image analysis coupled to SEM while mechanical testing comprised tensile testing, hardness and microhardness measurements as well as impact tests.
The greatest improvement in mechanical properties obtained with modification was observed for the lower rates of solidification, i.e sand casting. The effect of modification on the heat treatment response of 356 alloy was investigated. The differences between unmodified and modified microstructures were more important in sand cast samples than in permanent mold cast samples. After one hour of solution heat treatment at 540$ sp circ$C, both permanent mold unmodified and modified microstructures became similar in terms of silicon particle size and sphericity. The processes which led to this were different. Silicon platelets in the unmodified structures segmented while silicon particles in the modified alloy coarsened. The final result was however the same. In sand cast alloy, the initial microstructural differences persisted after up to 12 hours of solution treatment. The coarser the initial as-cast microstructure, the greater the improvements associated with modification and heat treatment.
It was also found that porosity caused by modification can negate many of the microstructural benefits by decreasing tensile strength and percent elongation. It was demonstrated that modification also has an influence on the aluminum matrix. The hardness of modified alloy was found to be less after the T6 temper than in unmodified alloy. This was reflected in a lower yield strength of modified 356 alloy.
Quantitative microstructure-mechanical property relationships were established for the permanent mold samples. The best silicon-structure characteristics to predict the tensile properties were found to be the particle count per unit area and the particle area.
It was also determined that hardness can be a simple and inexpensive means whereby ultimate tensile strength and yield strength of 356 alloy in the T4 condition or T6 condition can be estimated.

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Jordon, James Brian. "DAMAGE AND STRESS STATE INFLUENCE ON BAUSCHINGER EFFECT IN ALUMINUM ALLOYS". MSSTATE, 2006. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04172006-133053/.

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In this work, the Bauschinger effect is shown to be intimately tied not only to plasticity but to damage as well. The plasticity-damage effect on the Bauschinger effect is demonstrated by employing different definitions (Bauschinger Stress Parameter, Bauschinger Effect Parameter, the Ratio of Forward-to-Reverse Yield, and the Ratio of Kinematic-to-Isotropic Hardening) for two differently processed aluminum alloys (rolled and cast) in which specimens were tested to different prestrain levels under tension and compression. Damage progression from second phase particles and inclusions that were generally equiaxed for the cast A356-T6 aluminum alloy and elongated for the rolled 7075 aluminum alloy was quantified from interrupted experiments. Observations showed that the Bauschinger effect had larger values for compression prestrains when compared to tension. The Bauschinger effect was also found to be a function of damage to particles/inclusions, dislocation/particle interaction, the work hardening rate, and the Bauschinger effect definition.

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Nittala, Aditya Kameshwara. "Electrical and Mechanical Performance of Aluminum Alloys with Graphite Nanoparticles". Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1554117521295178.

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Palmer, Benjamin. "Environmentally-Assisted Cracking Response in Field-Retrieved 5XXX Alloys". Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1585061712231734.

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Libri sul tema "Aluminum alloys. Mechanical engineering. Testing"

Materials Solutions Conference 2001 (2001 Indianapolis, Ind.). Advances in the metallurgy of aluminum alloys: Proceedings from Materials Solutions Conference 2001 : the James T. Staley honorary symposium on aluminum alloys, 5-8 November 2001, Indianapolis, Indiana. Materials Park, Ohio: ASM International, 2001.

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Gangloff, R. P. NASA-UVa light aerospace alloy and structures technology program (LA²ST). [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Gangloff, R. P. NASA-UVa light aerospace alloy and structures technology program (LA²ST). [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Gangloff, R. P. NASA-UVa light aerospace alloy and structures technology program (LA²ST). [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Munro, Ian Glenn. Optimizing superplastic response in lithium containing aluminum-magnesium alloys. 1987.

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Abou-Salama, Ahmed Ahmed. Analysis of grain refinement and superplasticity in aluminum-magnesium alloys. 1987.

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A, Leckie Frederick, e Lewis Research Center, a cura di. Mechanical behavior of a continuous fiber reinforced aluminum matrix composite subjected to transverse and thermal loading. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1991.

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Staley, James T., Indiana) Materials Solutions Conference 200 (2001 Indianapolis e James T. Staley Honorary Symposium on Aluminum Alloys. Advances in the Metallurgy of Aluminum Alloys: Proceedings of the James T. Staley Honorary Symposium on Aluminum Alloys, November 5-7, 2001, Indianapolis, Indiana. American Society for Metals, 2001.

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Ren, Binyan. Mechanical and microstructural characteristics of an Al-Li-Cu-Zr alloy during superplastic deformation. 1991.

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NASA-UVA light aerospace alloy and structures technology program (LAST): A progress report, January 1, 1994-June 30, 1994. Charlottesville, VA: Dept. of Materials Science and Engineering, School of Engineering & Applied Science, 1994.

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Capitoli di libri sul tema "Aluminum alloys. Mechanical engineering. Testing"

Hartwig, K. T., e R. J. DeFrese. "Mechanical and Electrical Testing of Composite Aluminum Cryoconductors". In Advances in Cryogenic Engineering Materials, 709–15. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4613-9880-6_92.

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Jaiswal, Shubham, Vijay Verma e Chaitanya Sharma. "Dissimilar Friction Stir Spot Welding of AA2014 and AA7075 Aluminum Alloys". In Lecture Notes in Mechanical Engineering, 567–73. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8704-7_69.

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Mazari, Mohamed, Wahiba Bendaho, Chahinez Gafour, Mohamed Benguediab e Nara Ranganathan. "Fatigue Behavior of Aluminum Alloys Requested by a Simple Overload: Environment Influence". In Lecture Notes in Mechanical Engineering, 415–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37143-1_49.

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Sharma, Yogita, e Hitesh Vasudev. "A Short Note on the Friction Stir Welding of the Aluminum Alloys". In Lecture Notes in Mechanical Engineering, 123–29. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4748-5_12.

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Kandasamy, J. "FE Analysis of Superplastic Forming Complex Shapes in Aluminum-Coated Magnesium Alloys". In Lecture Notes in Mechanical Engineering, 247–59. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7557-0_23.

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Giridharan, K., G. Chakravarthi, S. Karthick, S. MuthuKumaran, S. Padmanaban e M. Kabeerr. "Investigation on Mechanical Properties of AA6082-AA7075 Friction Stir Welded Dissimilar Aluminum Alloys". In Lecture Notes in Mechanical Engineering, 295–302. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6619-6_31.

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Abolusoro, Olatunji P., e Esther T. Akinlabi. "Optimization of Process Parameters Using Taguchi for Friction Stir Welding of Dissimilar Aluminum Alloys". In Lecture Notes in Mechanical Engineering, 199–211. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5753-8_19.

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Khalfallah, Asma Ben, Slim Ben Elechi e Riadh Bahloul. "Experimental Investigation and Finite Element Modeling on Incremental Forming Process of Aluminum Sheet Alloys". In Lecture Notes in Mechanical Engineering, 309–17. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-27146-6_33.

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Ben Halim, S., S. Bannour, K. Abderrazek, W. Kriaa e M. Autric. "Modeling of Heat Transfer and Transport Phenomena During Laser Welding Of Aluminum/Magnesium Alloys". In Lecture Notes in Mechanical Engineering, 57–62. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-52071-7_8.

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Ghadmode, M. M., Arpit R. Patil, B. U. Sonawane e Amrut Mulay. "Analysis of TIG-Welded Aluminum Alloys During Single Point Incremental Forming at Different Wall Angles". In Lecture Notes in Mechanical Engineering, 187–203. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9117-4_15.

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Atti di convegni sul tema "Aluminum alloys. Mechanical engineering. Testing"

James, Sagil, e Ambarneil Roy. "Optimization of Heat Treatment Aging Process Parameters for 7050 and 7075 Aluminum Alloys". In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-12045.

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Abstract Among the different commercially used Al alloys, the 7000 series offers some of the highest mechanical properties making them the material of choice for several critical engineering applications. These Al alloys often required to undergo a heat treatment process to enhance its mechanical properties to the desired levels. This process, known as Heat Treatment (HT) is a multi-step procedure which involves heating of the alloy to a set temperature followed by rapid quenching in a solution consisting of either water or glycol. Finally, the quenched alloys are subject to aging at near room or elevated temperatures which results in achieving the desired temper that has the mechanical and metallurgical properties that are needed for the application. Achieving the desired results in the HT process is extremely challenging and time-consuming. The most common industry practice is to rely on both metallurgical and manufacturing experts and resort to the costly trial-and-error approach which results in lower productivity, poor quality, and a massive waste of time, money, and energy. While there exist standard industrial specifications on the range of values to be used for heat temperatures, age soak times, and quench rates, the range is often too broad to be of any practical significance. The operators have to resort to a stop/restart approach while intermittently evaluating and testing the mechanical properties until the desired level is reached. Currently, there is a growing need to know the optimal operating parameters for the HT process. This study uses commercially available software to optimize the results for the heat treatment aging parameters using mechanical testing data such as hardness, yield strength, and electrical conductivity. Aging is the final step, and most of the time the longest step, in the HT process and therefore it is vital that the values such as age soak time are dialed in as much as possible to achieve the desired properties as soon as possible without wasting time, effort and energy.

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Hsu, Quang-Cherng, Shu-Ping Shi e Chi-Peng Hsu. "Study on the Solid Welding Conditions of Hollow Extrusion of 7075 Aluminum Alloy". In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40029.

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Direct extrusion by port hole–bridge die configuration has been successfully used to fabricate products with hollow cross sections for 6000 series aluminum alloys. When these aluminum alloys flow through the upper die (with bridge and port hole) material flows separately. These separate materials contact together when they flow through the lower die (with welding chamber). The contacting and welding processes occurs naturally if the material temperature and contact pressure are suitable; then the product with hollow and complicated cross section will be obtained when the material flow through bearing regions in lower die. This solid welding process for 6000 series aluminum alloys is without any problem. However, if for 7000 series aluminum alloys this situation alerts since different alloy compositions such as Zn and Cu causing welding process in lower die failed. It will impede the success of industry application with light and high strength aluminum alloys. In order to determine the solid welding conditions during hollow extrusion with port-hole die structure for high strength aluminum alloy such as 7000 series, an easy tooling configuration has been designed. Based on this approach, two split and half die components with taper angle feature were inserted into an outer steel ring. In the beginning, some clearances happen between inner die and outer ring result from design in purpose. When the upper punch continues to press the testing billet, the clearance disappears gradually due to the designed taper angle of inner die and outer ring. However, when the pushing pressure from upper punch is over 350 Mpa and billet temperature is maintained at about 480C below melting temperature, small gaps between the two split half die components occur automatically. During this situation, two small flashes can flow into the opening gaps both from the upper and lower billets which then can weld together. However, these two upper and lower billets in direct pressing zone did not weld together. Several experiments at different pressure have been conducted and the best solid welding condition has been obtained. The proposed method (die configuration) is easy and cheap because there is no necessary to conduct experiment in controlled environment such as in vacuum chamber of Gleeble test or in a protective atmosphere. The grain size and grain structure as well as grain flow have been discussed in the proposed paper for testing parts in direct pressing zone and in flash zone. Some SEM photos and EDS analysis have been prepared and will be presented in this paper.

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Hamid, Abdulhaqq Q., Sataish C. Jain, Prakriti K. Ghosh e Subrata Ray. "Cast In-Situ Al (Mg,Mo)-Al2O3 (MoO3) Composite: Characterization and Tribological Behavior". In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79835.

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Aluminum alloy-based cast in-situ composite has been synthesized by dispersion of externally added molybdenum trioxide particles (MoO3) in molten aluminum at the processing temperature of 850 °C. During processing, displacement reaction between molten aluminum and MoO3 particles, results in formation of alumina particles in-situ also releases molybdenum into molten aluminum. A part of this molybdenum forms solid -solution with aluminum and the remaining part reacts with aluminum to form intermetallic phase Mo(Al1−xFex)12 of different morphologies. Magnesium (Mg) is added to the melt in order to help wetting of alumina particles generated in-situ, by molten aluminum and help to retain these particles inside the melt. The mechanical properties (ultimate tensile stress, yield stress, percentage elongation and hardness) of the cast in-situ composite are relatively higher than those observed either in cast commercial aluminum or in cast Al-Mo alloys. The wear and friction of the resulting cast in-situ Al(Mg, Mo)Al2O3(MoO3) composites have been investigated using a pin-on-disc wear testing machine, at different normal loads of 9.8, 14.7, 19.6, 24.5, 29.4, 34.3 and 39.2 N and a constant sliding speed of 1.05 m/s, under dry sliding conditions. The results indicate that the cumulative volume loss and wear rate of cast in-situ composites are significantly lower than those observed either in cast commercial aluminum or in cast Al-Mo alloy, under similar load and sliding conditions. Beyond about 30-35 N loads, there appears to be a higher rate of increase in the wear rate in the cast in-situ composite as well as in cast commercial aluminum and cast Al-Mo alloy. For a given normal load, the coefficient of friction of cast in-situ composite is significantly lower than those observed either in cast commercial aluminum or cast Al-Mo alloy. The coefficient of friction of cast in-situ composite increases gradually with increasing normal load while those observed in cast commercial aluminum or cast Al-Mo alloy remain more or less the same. Beyond a critical normal load of about 30-35 N, the coefficient of friction decreases with increasing normal load in all the three materials.

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James, Sagil, e Ambarneil Roy. "Study of Aging Heat Treatment Parameters for 7050 and 7075 Aluminum Alloys". In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8348.

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Abstract Among the different commercially used Aluminum (Al) alloys, the 7000 series offers some of the highest mechanical properties making them the material of choice for several critical engineering applications. These Al alloys often required to undergo a heat treatment (HT) process to enhance their mechanical and metallurgical properties to the desired levels. Currently, there is a growing need to find the optimal operational parameters for the HT process of Al 7000 series alloys. The operators have to resort to a start/stop approach, while intermittently evaluating and testing the mechanical properties until the desired level is reached. Among the various steps, aging is the final and often the longest step in the HT process. Consequently, the age soak time parameter needs to be narrowed to the smallest possible operating range for industrial applications. This study aims to experimentally optimize the age soak time of Al 7000 series alloys (7050-T74 and 7075-T73) by measuring its hardness, electrical conductivity (EC), fatigue properties. The study found that the optimal age soak times for 7050-T74 and 7075-T73 Al alloys are between 24–27 hours and 22–24 hours, respectively. The results of the study are subsequently confirmed using the grain flow and grain direction analysis. The results of this study are crucial in extending the applications of Al 7000 series alloys in several critical engineering industries.

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Fragomeni, James M., e Giridhar Venugopal. "Computational Process Simulation and Energy Parameter Analysis From Mechanical Deformation of Aerospace Alunimum Alloys". In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39290.

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Many systems that work on the processing of energy can be modeled in terms of that energy. The energy that is given to the system may be stored or dissipated in the form of heat. It was proposed to extend this concept to attainment of critical level of stored energy and/or dissipated energy for occurrence of buckling of a metal column under compressive loading. The fact that Energy Factor Parameter (E.F.P.) computed from the experimental true stress-true strain values, suddenly decreased and approached value close to zero indicated either buckling and/or softening, but deviated with the E.F.P. computed from the theoretical true stress and true strain values. The 7050-T7451 (Al-Zn-Mg-Cu-Zr) and Al-Li-Cu aluminum alloys in longitudinal and transverse grain orientations were compression tested for mechanical properties of yield strength, buckling strength, strength coefficient, strain hardening exponent. Correlation between ratio of buckling strength and yield strength with aging time for preaged ASTM compression specimens was established. The compression deformation of aluminum alloy 7050 was modeled using finite element analysis, with the experimental testing parameters and the database in the software package.

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Mayer, Robert R., Scott Webb, Ruth Gusko, Bruce Williams e Michael Worswick. "Axial Crush Drop Tower Testing of Hydroformed Sections". In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41421.

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This report summarizes the drop tower testing of initially circular straight aluminum tubes that had been hydroformed to a square section with round corners. Drop tower test conditions and test setup were determined for the AlMg3.5Mn aluminum alloy circular (76.2 mm outside diameter) tubes of either 2.0 or 3.5 mm thickness, which had been hydroformed into a square tube with corner radii of 38.1 (unformed), 33, 30, 27 and 24 mm. To initiate test setup, theoretical equations were found to be reasonable indicators of displacement and load cell requirements. Four-lobe symmetric modes were found for the square tubes, and three-lobe asymmetric modes for the circular tubes. The number of folding half-waves of seven for 3.5 mm tubes, and thirteen for 2 mm tubes, was generally overpredicted by theory. Aluminum end plates that were welded onto the tube ends allowed for fast test setup, but may have resulted in some sliding and tipping of the drop tower. The tubes were found to have decreasing average crush force with smaller corner radii, esp. for the 3.5 mm thick tubes.

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Mayer, Robert R., Weigang Chen e Anil Sachdev. "Crashworthiness Performance of Mass-Efficient Extruded Structures". In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39077.

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Theoretical, numerical and experimental studies were conducted on the axial crushing behavior of traditional single-cell and innovative four-cell extrusions. Two commercial aluminum alloys, 6061 and 6063, both with two tempers (T4 and T6), were considered in the study. Testing coupons taken from the extrusions assessed the nonlinear material properties. A theoretical solution was available for the one-cell design, and was developed for the mean crushing force of the four-cell section. Numerical simulations were carried out using the explicit finite element code LS-DYNA. The aluminum alloy 6063T4 was found to absorb less energy than 6061T4, for both the one-cell and four-cell configurations. Both 6061 and 6063 in the T6 temper were found to have significant fracture in the experimental testing. Theoretical analysis and numerical simulations predicted a greater number of folds for the four-cell design, as compared to the one-cell design, and this was confirmed in the experiments. The theoretical improvement in energy absorption of 57% for the four-cell in comparison with the one-cell design was confirmed by experiment. The good agreement between the theoretical, numerical and experimental results allows confidence in the application of the theoretical and numerical tools for both single-cell and innovative four-cell extrusions. It was also demonstrated that these materials have very little dynamic strain rate effect.

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Anthony Xavior, M., Prashantha Kumar Hosamane e Jeyapandiarajan Paulchamy. "Anisotropic Behavior of Aluminum Alloy 2024-Graphene Composites at Varying Strain Rates". In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70087.

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In fabrication of high strength materials coupled with improved mechanical properties; focus on integration of multifunctional reinforcements are increasing along with novel processing methods. Single layer 2-D material Graphene are among one such novel material with huge aspect ratio, posse’s high strength. But the real challenge is processing and incorporation of these reinforcements with appropriate content in metals or its alloys matrix. Current research work focus to study the anisotropic behavior on addition of pristine Graphene/MWCNT and processing methods like ball milling under constant ball to powder precursor ratio (BPR) of AA 2024 nanocomposites. The extent change in aspect ratio, size of the nanoparticle mixtures during ball milling were analyzed under SEM and Raman spectroscopy. Thus obtained (ball milled) precursors are consolidated through vacuum hot press and hot extruded to get typical flat specimen at optimized processing parameters. XRD analysis, relative density and hardness measurement is done on extruded composites. Thus developed composites are subjected to study the anisotropic behavior at various orientations and strain rates (0.5, 1.0, 1.5 mm/min) using uniaxial tensile testing instrument and corresponding stress strains graphs were obtained. The fracture surfaces were characterized by scanning electron microscope (SEM) and its shows the nucleation of the dimple size are varies with increasing the strain rate and also deeper dimple size were noticed. Negative strain sensitivity were observed for the lower strain rate (0.1 and 0.3 mm/min) and positive strain sensitivity for higher strain rates. Microstructural anisotropy infers that AA2024-Graphene/MWCNT composites are sensitive to strain rate and shear type of failure is observed on increasing the strain rate.

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Tikhonov, Vadim, Mikhail Gelfgat, Rudolf Alikin, Valery Chizhikov, Valery Shaposhnikov e Paulo Dias. "Aluminum Catenary Production Riser: Design, Testing Results, Ways to Improvement". In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83001.

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One of the widely used systems for offshore oil production in water depths up to 500–2500 meters is a steel catenary riser (SCR). Requirements for long-term corrosion resistance of SCR are very stringent, that obliges to manufacture it from expensive steels. Still, the increased water depth leads to increased riser tension, grown pressure, aggravated buckling and oscillation problems. Among alternative materials to manufacture catenary risers, i.e., steel, titanium and aluminum alloys, the aluminum is the best from the “Strength/Weight/Cost” aspects with its high corrosion strength. Design of an aluminum catenary production riser (ACPR) was developed in Russia; and comprehensive tests were performed on mechanical characteristics and corrosion resistance properties of ACPR tubes and their connections. Two possible connections of riser sections were considered, i.e., welded and threaded. Strength analysis of threaded connection was performed by FEM. Mechanical testing included: testing of small samples of pipe material and welded connection cut out of riser section, testing of full-scale specimens of connection prototypes, and measurement of residual stresses. Structural and corrosion tests of samples consist of investigation of standard metallographic characteristics of pipe material and welded connection, and assessment of effects of different types of corrosion in seawater and oil fluid. The results of performed work have led to the conclusion that welded connection is most prospective for ACPR manufacturing. At the same time, the testing revealed certain improvements need to be done in the course of further work on this project.

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Dewan, Mohammad W., Jiandong Liang, M. A. Wahab e Ayman M. Okeil. "Effects of Residual Stresses and the Post Weld Heat Treatments of TIG Welded Aluminum Alloy AA6061-T651". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85889.

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Heat treatable AA-6061 T651 Aluminum alloys (Al-Mg-Si) have found considerable importance in various structural applications for their high strength to weight ratio and corrosion resistance properties. Weld defects, residual stresses, and microstructural changes are the key factors for the performance reduction as well as failure of welded structures. Tungsten inert gas (TIG/GTAW) welding was carried out on AA-6061 T651 Aluminum Alloy plates using Argon/Helium (50/50) as the shielding gas. Non-destructive phased array ultrasonic testing (PAUT) was applied for the detection and characterization of weld defects and characterization of the mechanical performances. In this study, ultrasonic technique was also used for the evaluation of post-weld residual stresses in welded components. The approach is based on the acoustoelastic effect, in which ultrasonic wave propagation speed is related to the magnitude of stresses present in the materials. To verify the estimated residual stresses by ultrasonic testing, hole-drilling technique was carried out and observed analogous results. The effects of post weld heat treatment (PWHT) on the residual stresses, grain size, micro hardness, and tensile properties were also studied. The grain size and micro hardness were studied through Heyn’s method and Vickers hardness test, respectively. Lower residual stresses were observed in post-weld heat-treated specimens, which also experienced from microstructure and micro hardness studies. The PWHT also resulted enhanced tensile properties for the redistribution of microstructures and residual stresses.

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