Relevant bibliographies by topics / Aluminum alloys – Fracture

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
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Academic literature on the topic 'Aluminum alloys – Fracture'

Author: Grafiati
Published: 4 June 2021
Last updated: 29 January 2023

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Journal articles on the topic "Aluminum alloys – Fracture"

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Shneider, G. L., L. M. Sheveleva, and V. V. Kafel'nikov. "Delayed fracture of aluminum alloys." Metal Science and Heat Treatment 41, no. 3 (March 1999): 109–16. http://dx.doi.org/10.1007/bf02467695.

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Kwon, Yong Nam, Kyu Hong Lee, and Sung Hak Lee. "Fracture Toughness and Fracture Mechanisms of Cast A356 Aluminum Alloys." Key Engineering Materials 345-346 (August 2007): 633–36. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.633.

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The present study aims at investigating the effects of microstructure on fracture toughness of two A356 Al alloys. These A356 alloys were fabricated by casting processes such as rheo-casting and casting-forging, and their mechanical properties and fracture toughness were analyzed in relation with microfracture mechanisms. All the cast A356 alloys contained eutectic Si particles mainly segregated along solidification cells, and the distribution of Si particles was modified by the casting-forging process. Microfracture observation results revealed that eutectic Si particles segregated along cells were cracked first, but that Al matrix played a role in blocking crack propagation. Tensile properties and fracture toughness of the cast-forged alloys having homogeneous distribution of eutectic Si particles were superior to those of the rheo-cast alloy.
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Zhao, DongSheng, TianFei Zhang, LeLe Kong, DaiFa Long, and YuJun Liu. "Effect of ER5356 Welding Wire on Microstructure and Mechanical Properties of 5083 Aluminum Alloy GTAW Welded Joint." Journal of Ship Production and Design 37, no. 03 (August 19, 2021): 196–204. http://dx.doi.org/10.5957/jspd.10200026.

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Automatic gas tungsten arc welding experiments of 5083 aluminum alloy were completed, to analyze the weld microstructure and mechanical properties. The influences of welding current, travel speed, frequency, and arc length on weld forming and mechanical properties were studied. When the welding current was 160 A, the travel speed was 380 mm/min, the frequency was 100 Hz, the arc length was 4 mm, and the maximum tensile strength of the welded joint was 296.9 MPa, which was 86.8% of the base metal’s tensile strength. The fracture elongation was 7.8%. No porosity was formed in the weld, but there were poor fusion problems. ER5356 welding wire can improve the problem of poor weld fusion and accommodate Mg element vaporization losses. When the wire feeding speed was 1200 mm/min, the tensile strength of the welded joint can be improved to 315.2 MPa, which was 92.2% of the base material’s tensile strength, and the fracture elongation was 8.5%. The tensile specimens fractured in the heat-affected zone. The fracture surface was characterized as plastic fracture. Introduction Specific strength of aluminum alloy is high, so aluminum alloys reduce the weight of the structure compared with steel structures. Aluminum alloys have a broad application prospect in aerospace, automotive, and marine industries based on their good corrosion resistance, low temperature resistance, good processability, and rich alloy system (Kuk et al. 2004; Wang & Zhang 2015; Canepa et al. 2018; Gaur et al. 2018; Qiang & Wang 2019). In recent years, to reduce the weight of the structure such as trimaran hull and improve speed, aluminum alloys have been more and more applied in shipbuilding. But there are many problems in the welding of aluminum alloy.
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Grinevich, A. V., V. S. Erasov, V. V. Avtaev, and S. M. Shvets. "Sheet aluminum alloys fracture toughness definition." «Aviation Materials and Technologies», s4 (2014): 40–44. http://dx.doi.org/10.18577/2071-9140-2014-0-s4-40-44.

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Hermann, R. "Environmentally Assisted Fracture of Aluminum Alloys." CORROSION 44, no. 10 (October 1988): 685–90. http://dx.doi.org/10.5006/1.3584929.

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Kobayashi, T. "Strength and fracture of aluminum alloys." Materials Science and Engineering: A 286, no. 2 (July 2000): 333–41. http://dx.doi.org/10.1016/s0921-5093(00)00935-7.

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Kobayashi, T. "Strength and fracture of aluminum alloys." Materials Science and Engineering: A 280, no. 1 (March 2000): 8–16. http://dx.doi.org/10.1016/s0921-5093(99)00649-8.

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Vasudévan, A. K., and S. Suresh. "Lithium-containing aluminum alloys: cyclic fracture." Metallurgical Transactions A 16, no. 3 (March 1985): 475–77. http://dx.doi.org/10.1007/bf02814350.

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Siddiqui, Rafiq Ahmed, Saeed Ali Al- Araimi, and Ahmet Turgutlu. "Influence of Aging Conditions on Fatigue Fracture Behaviour of 6063 Aluminum Alloy." Sultan Qaboos University Journal for Science [SQUJS] 6, no. 1 (December 1, 2001): 53. http://dx.doi.org/10.24200/squjs.vol6iss1pp53-60.

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Aluminum - Magnesium - Silicon (Al-Mg-Si) 6063 alloy was heat-treated using under aged, peak aged and overage temperatures. The numbers of cycles required to cause the fatigue fracture, at constant stress, was considered as criteria for the fatigue resistance. Moreover, the fractured surface of the alloy at different aging conditions was evaluated by optical microscopy and the Scanning Electron Microscopy (SEM). The SEM micrographs confirmed the cleavage surfaces with well-defined fatigue striations. It has been observed that the various aging time and temperature of the 6063 Al-alloy, produces different modes of fractures. The most suitable age hardening time and temperature was found to be between 4 to 5 hours and to occur at 460 K. The increase in fatigue fracture property of the alloy due to aging could be attributed to a vacancy assisted diffusion mechanism or due to pinning of dislocations movement by the precipitates produced during aging. However, the decrease in the fatigue resistance, for the over aged alloys, might be due to the coalescence of precipitates into larger grains.
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Yang, Yu Lan, Wei Qi Wang, Feng Li Li, Wei Qing Li, and Yong Qiang Zhang. "The Effect of Aluminum Equivalent and Molybdenum Equivalent on the Mechanical Properties of High Strength and High Toughness Titanium Alloys." Materials Science Forum 618-619 (April 2009): 169–72. http://dx.doi.org/10.4028/www.scientific.net/msf.618-619.169.

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The effect of Aluminum equivalent and Molybdenum equivalent on the strength and fracture toughness of titanium alloys was studied in this paper. The result shows that the tensile strength of the alloy increases with increasing of aluminum equivalent and molybdenum equivalent and the fracture toughness decreases gradually, the effect of aluminum equivalent is comparatively more conspicuous. A suitable value range of aluminum equivalent and molybdenum equivalent of high strength and high toughness titanium alloys are obtained from the analysis, based on this, a new type of high strength and high toughness titanium alloy BTi-6554 (Ti-4Al-5Mo-5V-6Cr) was developed, which has good combination of strength and fracture toughness and has the characteristics of high strength and high toughness.
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Dissertations / Theses on the topic "Aluminum alloys – Fracture"

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Lee, Jonghee. "Fracture analysis of a propagating crack in a ductile material /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/7081.

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Zafari, Farzad. "Experimental and numberical study of elastic-plastic mixed-mode fracture /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/7034.

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Pouillier, Édouard. "Hydrogen-induced Intergranular Fracture of Aluminum-Magnesium Alloys." Paris, ENMP, 2011. http://www.theses.fr/2011ENMP0095.

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Les alliages d'aluminium de la famille 5XXX (Al-Mg) sont utilisés dans la fabrication de pièces de structure en raison de leurs bonnes propriétés mécaniques, de soudabilité et de résistance à la corrosion. Toutefois, dans des conditions d'utilisation sévères, une synergie entre la déformation plastique et les réactions de corrosion se produit et entraîne une fissuration intergranulaire, par corrosion sous contrainte (CSC), voire par fragilisation par l'hydrogène (FPH). La ductilité passe de 50% à quelques %, montrant une fissuration fragile. La compréhension des mécanismes qui régissent ce type de fissuration nécessite la détermination de l'importance respective des principaux facteurs (notamment mécaniques et chimiques). Cette étude se concentre sur le rôle de la plasticité cristalline dans le cas de la fragilisation par l'hydrogène. Pour ce faire, des éprouvettes préalablement fragilisées en surface par l'hydrogène (via un chargement cathodique) ont été sollicitées en traction. Ces essais ont été menés in situ dans le microscope électronique à balayage. Les résultats de corrélation d'image ont montré que les fissures s'amorcent dans des régions faiblement déformées adjacentes à des régions fortement déformées, là où les contraintes intergranulaires les plus élevées sont attendues. Par ailleurs, la cartographie des orientations cristallines des surfaces observées au cours des essais a servi de base à un maillage réaliste de la structure, qui a permis de calculer les champs de contraintes et de déformation locaux à l'aide d'un modèle de plasticité cristalline. Le modèle a été validé par la confrontation des prédictions à la mesure des champs de déformation et aux courbes de chargement macroscopique. Les contraintes ainsi estimées par simulation numérique ont permit d'établir un critère de rupture. Ce critère de rupture a ensuite été incorporé dans la simulation de microstructure quasi-2D grâce à un modèle de zone cohésive. Les résultats obtenus en accord avec les observations ont mis en avant la nécessité de développer une méthodologie permettant de prendre en compte les effets de la microstructure situés sous les surfaces étudiées. Ces microstructures ont été caractérisées à l'aide de plusieurs techniques d'analyse 3D de la morphologie microstructurale des agrégats polycristallins (EBSD par couches successives et par microtomographie rayons X des joints de grains à l'aide de diffusion de gallium). Les résultats des simulations avec les microstructures réelles en 3D dans le domaine élastique sont cohérant avec ceux obtenus en 2D pour des agrégats composés de 40 grains
Aluminium alloys that are strengthened by alloying elements in solid solution may present a particular sensitivity to intergranular stress corrosion cracking as a result of intergranular dissolution. In Al-5Mg alloys such as AA5083, precipitation of the β-phase (Al3Mg2) at grain boundaries strongly favours intergranular fracture. Previous experimental studies revealed that local plasticity seems to play a significant role in crack initiation. Nevertheless, the exact role of crystal plasticity in the vicinity of grain boundaries is not well understood. The main goal of this doctoral thesis is two-fold: (i) to study the role of the local stress and strain fields on the mechanism of intergranular stress corrosion cracking and, based on such understanding, (ii) to develop a micro-mechanics based model to predict the onset of grain boundary cracking, through a suitably defined failure criterion, and the subsequent intergranular crack propagation. An experimental procedure based on in-situ tensile tests within the chamber of an scanning electron microscope was developed to measure the evolution of local strain fields at various microstructural scales and of lattice orientation using digital image correlation and electron backscatter diffraction (EBSD) techniques, respectively. Digital image correlation techniques were used in particular over areas comprising just a few grains up to mesoscopic regions of the polycrystal to quantify the deformation and strain fields required in the multi-scale study of intergranular fracture. From these observations, it was established that interfaces between two grains which have undergone little amount of deformation but lying within a neighbourhood of significantly deformed grains are the first to develop micro-cracks. In addition, X-Ray tomography and serial EBSD sectioning analyses revealed that cracked grain boundaries were perpendicular to the applied tensile load, where maximum tensile tractions are expected. To determine the role of local stresses and local plasticity on the mechanisms of intergranular fracture, a dislocation mechanics based crystal plasticity model was employed to describe the constitutive behaviour of each grain in the finite element model of the in-situ experiments. The model parameters were calibrated as a function of the solid solution magnesium content in the aluminium alloy. Measured EBSD maps were relied upon to define the orientation of the discrete grain regions of the in-situ specimens in the corresponding multi-scale finite element (FE) models. From the FE results, a range of threshold values of the normal grain boundary tractions needed to initiate intergranular cracks was identified. This finding is in close agreement with the predictions from an analytical solution of a simplified model of intergranular cracking based on an extension of Eshelby's theory for inclusions. Finally, a cohesive zone model calibrated with the critical grain boundary tractions and typical surface energies was added to the FE model of the polycrystal. A comparison between the experimental and numerical results reveals a good agreement with the observed experimental cracking pattern
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Lyons, Jed S. "Microstructural influences on fracture toughness in A357 cast aluminum alloys." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/16689.

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Deshpande, Nishkamraj U. "Characterization of fracture path and its relationship with microstructure and fracture toughness of aluminum alloy 7050." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/20210.

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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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Vasudevan, Satish. "AN INVESTIGATION OF QUASI-STATIC BEHAVIOR, HIGH CYCLE FATIGUE AND FINAL FRACTURE BEHAVIOR OFALUMINUM ALLOY 2024 AND ALUMINUM ALLOY 2219." Akron, OH : University of Akron, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1193668130.

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Thesis (M.S.)--University of Akron, Dept. of Mechanical Engineering, 2007.
"December, 2007." Title from electronic thesis title page (viewed 02/23/2008) Advisor, T. S. Srivatsan; Faculty readers, Craig Menzemer, Amit Prakash; Department Chair, Celal Batur; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
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Dadkhah, Mahyar Sh. "Analysis of ductile fracture under biaxial loading using moiré interferometry /." Thesis, Connect to this title online; UW restricted, 1988. http://hdl.handle.net/1773/7026.

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Hilty, Eric. "Influence of Welding and Heat Treatment on Aluminum Alloys." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1396877051.

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Balasundaram, Arunkumar. "Effect of stress state and strain on particle cracking damage evolution in 5086 wrought al-alloy." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/14809.

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Books on the topic "Aluminum alloys – Fracture"

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Fracture resistance of aluminum alloys: Notch toughness, tear resistance, and fracture toughness. Washington, D.C: Aluminum Association, 2001.

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Beaver, P. W. Experimental and theoretical determination of J(IC) for 2024-T351 aluminium alloy. Melbourne, Australia: Aeronautical Research Laboratories, 1986.

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Schwarmann, L. Material data of high-strength aluminium alloys for durability evaluation of structures: Fatigue strength, crack propagation, fracture toughness. Düsseldorf: Aluminium-Verlag, 1986.

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Gross, Jürgen. Eigenschaften von Aluminium-Silicium-Legierungen in unterschiedlichen Behandlungszuständen unter besonderer Beachtung des Gefügeeinflusses auf die Festigkeitswerte und auf das Bruchverhalten. Berlin: Wissenschaft und Technik Verlag, 1992.

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1950-, Cheng Shu-hong, and Mobley Carroll E. 1941-, eds. A fractography atlas of casting alloys. Columbus, Ohio: Battelle Press, 1992.

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Wanhill, R. J. H. Fatigue and fracture of aerospace aluminium alloys: A short course. Amsterdam: National Aerospace Laboratory, 1994.

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Höhne, Volker. Mechanische und bruchmechanische Bewertung des Bruchverhaltens von WIG-Schweissverbindungen der Aluminiumlegierung A1Mg4,5Mn bei statischer, dynamischer und zyklischer Beanspruchung. Leipzig: Deutscher Verlag für Grundstoffindustrie, 1991.

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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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Idziak, Adam. Anizotropia prędkości fal sejsmicznych i jej związek z orientacją systemów spękań masywów skalnych. Katowice: Uniwersytet Śląski, 1992.

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Koning, A. V. de. Finite element analyses of stable crack growth in thin sheet material. Amsterdam: National Aerospace Laboratory, 1985.

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Book chapters on the topic "Aluminum alloys – Fracture"

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Toda, Hiroyuki, Hideyuki Oogo, Hideki Tsuruta, Keitaro Horikawa, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Suzuki, and Masakazu Kobayashi. "Origin of Ductile Fracture in Aluminum Alloys." In ICAA13: 13th International Conference on Aluminum Alloys, 565–70. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495292.ch83.

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Toda, Hiroyuki, Hideyuki Oogo, Hideki Tsuruta, Keitaro Horikawa, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Suzuki, and Masakazu Kobayashi. "Origin of Ductile Fracture in Aluminum Alloys." In ICAA13 Pittsburgh, 565–70. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-48761-8_83.

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Kwon, Yong Nam, Kyu Hong Lee, and Sung Hak Lee. "Fracture Toughness and Fracture Mechanisms of Cast A356 Aluminum Alloys." In The Mechanical Behavior of Materials X, 633–36. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-440-5.633.

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Reynolds, Anthony P., Bob Wheeler, and Kumar V. Jata. "Deformation, Fracture and Fatigue in a Dispersion Strengthened Aluminum Alloy." In Lightweight Alloys for Aerospace Application, 87–97. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118787922.ch8.

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Denzer, D. K., R. J. Rioja, G. H. Bray, G. B. Venema, and E. L. Colvin. "The Evolution of Plate and Extruded Products with High Strength and Fracture Toughness." In ICAA13: 13th International Conference on Aluminum Alloys, 587–92. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495292.ch86.

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Boselli, J., G. Bray, R. J. Rioja, D. Mooy, G. Venema, G. Feyen, and W. Wang. "The Metallurgy of High Fracture Toughness Aluminum-Based Plate Products for Aircraft Internal Structure." In ICAA13: 13th International Conference on Aluminum Alloys, 581–86. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495292.ch85.

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Bouazara, M. "Improvement in the Design of Automobile Upper Suspension Control Arms Using Aluminum Alloys." In Damage and Fracture Mechanics, 101–12. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2669-9_11.

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Tayon, Wesley A., Marcia S. Domack, and Stephen J. Hales. "Correlation of Fracture Behavior with Microstructure in Friction Stir Welded, and Spin-formed Al-Li 2195 Domes." In ICAA13: 13th International Conference on Aluminum Alloys, 623–28. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495292.ch90.

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Jin, Helena, Wei-Yang Lu, John Korellis, and Sam McFadden. "Experimental Study of Voids in High Strength Aluminum Alloys." In Time Dependent Constitutive Behavior and Fracture/Failure Processes, Volume 3, 39–40. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9794-4_6.

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Mae, Hiroyuki, Xiaoqing Teng, Yuanli Bai, and Tomasz Wierzbicki. "Calibration of Ductile Fracture Properties of Two Cast Aluminum Alloys." In Experimental Analysis of Nano and Engineering Materials and Structures, 797–98. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6239-1_396.

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Conference papers on the topic "Aluminum alloys – Fracture"

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San Marchi, Chris, Martina Schwarz, and Joseph Ronevich. "Effect of High-Pressure Hydrogen and Water Impurity on Aluminum Alloys." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21277.

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Abstract Aluminum alloys are desirable in mobile fuel cell applications due to the combination of strength, hydrogen resistance, and low density. In dry hydrogen environments, the fatigue and fracture resistance of common structural aluminum alloys are not degraded compared to air environments. However, aluminum alloys can be susceptible to stress corrosion cracking in humid air, which raises questions about the potential deleterious effects of moisture impurities in high-pressure hydrogen environments. While this study does not address the effects of the air environment on aluminum hydrogen pressure components, we assess the fracture resistance of aluminum alloys in high-pressure hydrogen containing known amount of water. High-pressure gaseous hydrogen at pressure up to 100 MPa is shown to have no effect on elastic-plastic fracture measurements of common high-strength aluminum alloys in tempers designed for resistance to stress corrosion cracking. Complementary sustained load cracking tests in high-pressure hydrogen were also performed in gaseous hydrogen at pressure of approximately 100 MPa with water content near the maximum allowed in hydrogen standards for fuel cell vehicles. These tests show no evidence of environmental-assisted cracking at loading conditions approaching the onset of unstable fracture in this configuration. In summary, typical moisture content in fuel cell grade hydrogen (< 5 ppm) do not promote hydrogen-assisted fracture or stress corrosion cracking in the tested aluminum alloys.
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Li, Ming. "Dimensional Analysis: A Different Perspective to Design Aluminum Alloys Concerning Intergranular Fracture." In Proceedings of the International Symposium on Plasticity and Impact (ISPI 2001). WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812794536_0014.

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Matsuoka, Saburo, Takashi Iijima, Satoko Yoshida, Junichiro Yamabe, and Hisao Matsunaga. "Various Strength Properties of Aluminum Alloys in High-Pressure Hydrogen Gas Environment." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93478.

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Abstract Three types of strength tests, slow strain rate tensile (SSRT), fatigue life, and fatigue crack growth (FCG) tests, were performed using six types of aluminum alloys, 5083-O, 6061-T6, 6066-T6, 7N01-T5, 7N01-T6, and 7075-T6, in air and 115 MPa hydrogen gas at room temperature. All the strength properties of every material were not deteriorated in 115 MPa hydrogen gas. In all the materials, FCG rates were lower in 115 MPa hydrogen gas than in air. This was considered to be due to a lack of water- or oxygen-adsorbed film at crack tip in hydrogen gas. In 5083-O, 6061-T6 and 6066-T6, relative reduction in area (RRA) were remarkably higher in 115 MPa hydrogen gas than in air. These differences were attributed to a hydrostatic pressure produced in 115 MPa hydrogen gas. In contrast, in 7N01-T5, 7N01-T6 and 7075-T6, the values of RRA in 115 MPa hydrogen gas were nearly the same as those in air. Observation of fractured specimens inferred that the degree of such a hydrogen-induced improvement was determined by the fracture mode (e.g. cup-and-cone or shear fracture), which is dominated by the microstructure morphology.
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Wahab, Muhammad A., and Vinay Raghuram. "Fatigue and Fracture Mechanics Analysis of Friction Stir Welded Joints of Aerospace Aluminum Alloys Al-2195." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63285.

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Friction-Stir-Welding (FSW) has been adopted as a major process for welding Aluminum aerospace structures. Aluminum (Al-2195) which is one of the new generations Aluminum alloys that has been used for the new super lightweight external tank for the space shuttle. NASA’s Michaud Assembly Facility (MAF) in New Orleans is continuously pursuing Friction-Stir-Welding (FSW) technologies in its efforts to advance fabrication of the external tanks of the space shuttles. The future launch vehicles which will have reusable mandates, for the structure to have good fatigue properties which prompts an investigation into the fatigue behavior of the friction stir welded aerospace structures. The butt joint specimens of Aluminum alloys (Al-2195 and Al-2219) are fatigue tested according to ASTM-E647. The effects of stress ratios, corrosion preventive compound (CPC), and periodic overloading on fatigue life is investigated. Scanning Electron Microscopy (SEM) is used to examine the failure surfaces and examine the different modes of crack propagation i.e. tensile, shear, and brittle modes. It is found that fatigue life increases with the increase in stress ratios; the fatigue life also increases from 30%–38% with the use of CPC; and the fatigue life could increase 8–12 times with periodic overloading; while the crack closure phenomenon predominates the fatigue fracture. Numerical analysis has been used to model fatigue life prediction scheme for these structures, the interface element technique with critical bonding strength criterion for formation of new surface has been used to model crack propagation. The linear elastic fracture mechanics stress intensity factor is calculated using FEA and the fatigue life predictions made using this method; and are within 10%–20% of the experimental fatigue life obtained.
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Farahmand, Bob. "Fracture Properties Estimation of Aluminum Lithium Alloys Subjected to Exposure Time (Analytical Approach Versus Physical Testing)." In 45th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics & Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-1937.

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Miscia, Giuseppe, Vincenzo Rotondella, Andrea Baldini, Enrico Bertocchi, and Luca D’Agostino. "Aluminum Structures in Automotive: Experimental and Numerical Investigation for Advanced Crashworthiness." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51724.

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Ductility of aluminum alloys is highly used in automotive applications where crashworthiness becomes relevant. Due to its physical and mechanical properties, aluminum allows structures to be designed with good capacity to absorb energy, without increasing the overall weight of cars. In particular, high elongation allows for the conversion of a great amount of kinetic energy related to crash events in plastic deformation. If this was not the case, the energy involved during an accident could interest also the occupants, causing serious injuries. During large deformation of structures, chassis components may be subjected to failure, limiting the capacity of energy absorption. Therefore, the capability to predict the behavior of structures under crash loads becomes very important during the cars design process. Under these circumstances, finite element analysis is useful to simulate the response and to validate a project. In the last few years, prediction of materials behavior has become relevant in order to simulate in the best possible way the reaction of structures under dynamic loads. Contrary to what was expected, aluminum alloy might show anisotropic behavior after manufacturing processes. Extrusion, lamination and forging processes can modify crystallography, grains shape, precipitates and dislocations structures, affecting considerably the plastic properties. Furthermore, the failure limit strictly depends on the stress-strain state in the material during the crash event. Tensile state, shear state, compressive state and mixing states generally return different failure limits. Hence, it is indispensable to arrange a huge experimental campaign to define a thorough characterization of an aluminum alloy. Finite element (FE) codes give the possibility to include all these aspects, but several parameters need to be finely tuned. By limiting the number of tests, the present work aims at obtaining the numerical-experimental correlation of some crash absorbers during an impact. Tensile and shear specimens have been cut from the extruded parts of the chassis in 0°, 45° and 90° with respect to the extrusion direction. It is possible to define a fracture locus curve that identifies the equivalent strain limit of the aluminum alloys studied. For instance, Johnson-Cook and Bao-Wierzbicki criteria for aluminum alloys have been defined starting from a complete experimental campaign. They also give approximated analytical functions to define the entire fracture locus curve depending on the stress state. Uniaxial tensile and shear failure limits are the only ones taken into account in this work. Different hypothesis have been considered to define the rest of the fracture locus. Tuning the function parameters of the chosen criteria, a failure curve for compression, shear, tensile and mixing states have been set according to the experimental tests performed. The material card obtained has been further refined during the numerical-experimental correlation of both the samples and the crash absorbers: mesh size effects have been taken into account to assess the approximations of stress and strain into shell elements. In this work, fine mesh is only used during the initial correlation of specimens. This allows for considerably reducing the computational time of FE models studied. Acceleration signals and failures have been monitored in the crash absorbers. A high correlation between the experimental and numerical tests have validated the current methodology. Because of the few experimental tests performed on samples, it is not possible to study the exact mesh scaling effects at the beginning. Further refining is needed during the correlation of the whole component to get the right failures. In any case, the error given by the experimental dispersion could compromise the correlation and this is the reason why accuracy is not always necessary during the first phases of the correlation settings.
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Yan, Cuifen, Xin Wu, and Sayed Nassar. "Characterization of Adhesive-Bonded Sheet Metal Joints." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63498.

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The bonding strength of metal-metal single-lap joints with different adhesives applied on steels and aluminum alloys were studied. The bonding strength is found to be related to the type of adhesives and the backing metal, the surface roughness, the surface scratch orientations, the adhesive layer thickness, and the loading conditions (static vs. cyclic and loading rate). SEM observation of fractured surfaces reveals some common feature of bonding strength enhancement, fracture paths and the mechanisms of fracture. The direction of the adhesive joint design is suggested.
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Salandro, Wesley A., Joshua J. Jones, Timothy A. McNeal, John T. Roth, Sung-Tae Hong, and Mark T. Smith. "Effect of Electrical Pulsing on Various Heat Treatments of 5XXX Series Aluminum Alloys." In ASME 2008 International Manufacturing Science and Engineering Conference collocated with the 3rd JSME/ASME International Conference on Materials and Processing. ASMEDC, 2008. http://dx.doi.org/10.1115/msec_icmp2008-72512.

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Previous studies have shown that the presence of a pulsed electrical current, applied during the deformation process of an aluminum specimen, can significantly improve the formability of the aluminum without heating the metal above its maximum operating temperature range. The research herein extends these findings by examining the effect of electrical pulsing on 5052 and 5083 Aluminum Alloys. Two different parameter sets were used while pulsing three different heat treatments (As Is, 398°C, and 510°C) for each of the two aluminum alloys. For this research, the electrical pulsing is applied to the aluminum while the specimens are deformed, without halting the deformation process. The analysis focuses on establishing the effect the electrical pulsing has on the aluminum alloy’s various heat treatments by examining the displacement of the material throughout the testing region of dogbone shaped specimens. The results from this research show that pulsing significantly increases the maximum achievable elongation of the aluminum (when compared to baseline tests conducted without electrical pulsing). Significantly reducing the engineering flow stress within the material is another beneficial effect produced by electric pulsing. The electrical pulses also cause the aluminum to deform non-uniformly, such that the material exhibits a diffuse neck where the minimum deformation occurs near the ends of the specimen (near the clamps) and the maximum deformation occurs near the center of the specimen (where fracture ultimately occurs). This diffuse necking effect is similar to what can be experienced during superplastic deformation. However, when comparing the presence of a diffuse neck in this research, electrical pulsing does not create as significant of a diffuse neck as superplastic deformation. Electrical pulsing has the potential to be more efficient than traditional methods of incremental forming since the deformation process is never interrupted. Overall, with the greater elongation and lower stress, the aluminum can be deformed quicker, easier, and to a greater extent than is currently possible.
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Sugihara, Tatsuya, Takuma Nomura, Toshiyuki Enomoto, Anirudh Udupa, Koushik Viswanathan, and James Mann. "Exploring the Role of Mechanochemical Effects in Cutting of Aluminum Alloys With Alcohols." In ASME 2022 17th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/msec2022-85192.

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Abstract In metal cutting processes, a chemical ambient environment in the cutting zone can be a useful variable for process control and process performance improvement. In this work, we study how mechanochemical effects influence the chip formation process, especially focusing on a specific chemical reaction between aluminum alloys and alcohols as a model system. Using high speed in-situ imaging and particle image velocimetry, we demonstrate that the mechanochemical effect in cutting of annealed Al with use of isopropyl alcohol (IPA) is manifest in two different ways: a lubricating effect at the tool-chip interface and an embrittlement effect at the workpiece free-surface, depending on the undeformed chip thickness and cutting speed. Consequently, the highly unsteady chip flow seen in dry cutting of annealed Al, which is typically seen in cutting of ductile “gummy” metals, transitions to a laminar-type (smooth) chip-flow mode or a segmented, fracture-controlled chip flow, due to the Al-IPA reaction. In both cases, the modified chip flow modes lead to significant reduction in cutting forces and improvement of finished surface quality. The specific manifestation of the mechanochemical effect is found to be principally determined by the penetration capability of the alcohols into the tool-chip interface and the time required for the chemical reaction between aluminum and the alcohols. Also, we discuss some implications for improving the performance of practical Al cutting operations using alcohols as a fluid medium.
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Li, Zhuoqun, and Xin Wu. "Inner Surface Cracking of an Aluminum Alloy in Small-Radius Bending." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42976.

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Aluminum alloys, due to their low density, high strength to weight ratio and formability, are widely used in automotive components. At present, most of the sheet alloy being used is AA6111; an Al-Mg-Si alloy with addition of Cu. AA6111. These alloys contain micrometer sized inclusions and second phase particles, with good combination of strength and formability [1]. However, at the same time, the formability of AA6111 is also limited because of these micro-sized inclusions and second phase particles [2]. To improve the formability of sheet metal used as automotive body such as panels, a newer alloy AA6022 containing nano-sized strengthening precipitates and enhanced formability has been developed. A number of research works have been done on the precipitation sequences and phase development during aging of these alloys. Recently Miao and Laughlin have reported that the precipitation sequence in the AA6022 is in the following reaction: solid solution α → GP zones → β″ → β′ + lath-like precipitate ← β + Si [3, 4]. As to AA6111, the sequence of precipitation is believed to initiate with the metastable phases, β″ and β′ leading to the equilibrium β phase. The structure and composition of the β phase have been well established to be of the fluorite structure with a composition Mg2Si [5–7]. Recent works also report the presence of a quaternary phase, Q and its metastable precursor, Q′ in the precipitation sequence [8]. The aim of this report is to find the relationship between the microstructure and the failure of the hole expanded and small angle bended samples. We will report a finding of inner surface fracture during small-radius bending due to the tensile residual stress development in the inner surface.
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Reports on the topic "Aluminum alloys – Fracture"

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D. Schwam: J.F. Wallace: Y. Zhu: J.W. Ki. Metallic Reinforcement of Direct Squeeze Die Casting Aluminum Alloys for Improved Strength and Fracture Resistance. Office of Scientific and Technical Information (OSTI), October 2004. http://dx.doi.org/10.2172/882786.

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Starke, Edgar A., and Jr. Investigation of the Role of Trace Additions of Precipitation, Deformation and Fracture on Aluminum Alloys. Fort Belvoir, VA: Defense Technical Information Center, May 2001. http://dx.doi.org/10.21236/ada389780.

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3

deWit, Roland, Richard J. Fields, Samuel R. III Low, Donald E. Harne, and Tim Foecke. Fracture testing of large-scale thin-sheet aluminum alloy. Gaithersburg, MD: National Institute of Standards and Technology, 1995. http://dx.doi.org/10.6028/nist.ir.5661.

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