Experimental and numerical investigation on forming limit curves of AA6082 aluminum alloy at high strain rates

Simoncini, Michela; Forcellese, Archimede; Mancini, Edoardo; Chiappini, Gianluca; Sasso, M.

doi:10.1007/s00170-020-06448-7

Cited by 18 publications

(6 citation statements)

References 35 publications

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“…The flow stress σ is related to several thermally dependent components shown in Equation ( 8) [45,46] σD u ¼ constant (7) σ ¼ LðTÞε jðTÞ ε : f ðTÞ (8) Figure 9. Grain size prediction regression model where Ч is the strain, strain rate, and thermally dependent resultant of the following Equation (11).…”

Section: Local Recrystallization Analysismentioning

confidence: 99%

“…Formation of ASB will lead to cracking and early failure, which generally limits the total amount of deformation strain to less than 1. [9][10][11] Recrystallization microstructure, which is commonly observed in FSW, is usually difficult to achieve with split-Hopkinson bars with many of the tests being performed at room temperature. In hot compression tests, the strain rate varies from 10 À3 to 10 2 s À1 .…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Behavior and Microstructure Evolution during Hot Torsion Deformation of Aluminum Alloy AA2219

Gilmore

Liu

2022

Adv Eng Mater

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This study comprehensively analyzes the mechanical behavior and microstructural evolution of aluminum alloy AA2219-T87 undergoing high deformation and strain rates at elevated temperatures via hot torsion tests. An integrated experimental and modeling approach is employed, where a finite element model (FEM) is developed with ABAQUS to address local deformation and nonuniform temperature distribution along the specimen gauge section. A Johnson-Cook constitutive material model is calibrated based on the calculated and measured torque curves at different conditions. The grain structure distribution is characterized through optical microscopy and electron backscatter diffraction (EBSD) analysis. Combined with the ABAQUS calculated local thermomechanical conditions, microstructure modeling, using established literature-based equations, is established to provide insights into grain size distribution and recrystallization mechanisms. The calibrated material constitutive model, recrystallization model, and grain size model can be utilized to model various manufacturing processes, which involve hot deformation of aluminum alloys in the intermediate strain rate range of 14-78 s À1 . The constitutive model shows adequate matching of the experimental torque curves at 400, 450, and 500 °C. The recrystallization prediction model functions at over 94% accuracy and the grain size model provides an average deviation between predicted and measured grain size reduction of 11.5%.

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Section: Local Recrystallization Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Microstructure Evolution during Hot Torsion Deformation of Aluminum Alloy AA2219

Gilmore

Liu

2022

Adv Eng Mater

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“…The SHPB stand is designed, depending on its configuration, to test construction materials for dynamic effects—metal [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ], concrete [ 17 , 18 , 19 , 20 ], wood, rocks [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ], soil [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ] and other materials such as polymers, ceramics, etc. [ 51 , 52 , 53 , 54 , 55 , 56 , 57 , …”

Section: Introductionmentioning

confidence: 99%

Strength Characterization of Soils’ Properties at High Strain Rates Using the Hopkinson Technique—A Review of Experimental Testing

Sobczyk¹,

Chmielewski²,

Kruszka³

et al. 2021

Materials

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The paper presents a review of crucial experiments and the latest publications, presenting the previous and current trends in experimental research in 2018–2021 in the area of soil dynamic interaction based on the Hopkinson bar technique. A review of investigated experimental test stands was made, in particular, cohesive and non-cohesive soil specimens prepared with different dimensions and densities. From this study, it can be concluded that the dynamic response of the soil depends on many factors, e.g., density, cohesion, moisture and grain structure of the soil specimen. There is still a noticeable interest in SHPB experiments performed in both 1D and 3D versions under modified conditions (frozen/heated soil specimen, different degree of water saturation content of the soil sample) in a wide range of strain rates 102–104 s−1, which is a large field for further research. The need to learn about the characteristics of various types of soil (both cohesive and non-cohesive) for the selection of structural design solutions for the protection elements of critical infrastructure was emphasized.

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“…The results obtained from both experiments and FEM analysis showed the noticeable capability of high speed deformation in improving the formability of AA6082-T6 alloy. 13 Recently, the experimental determination of FLD in post-annealed multilayer composites was done by Rahmatabadi et al 14 It was concluded that the intermetallic formation during the post-annealing process can effectively enhance the formability in both sides of the FLD.…”

Section: Introductionmentioning

confidence: 99%

A method and apparatus for determination of the ultrasonic-assisted forming limit diagram

Najafizadeh

Rajabi

Hashemi

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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It was recently demonstrated that ultrasonic vibrations could result in lower forming forces and a better surface finish in a wide range of metal forming processes. The Nakazima stretch-forming test is a long-established experimental procedure for the formability evaluation of sheet metals. Today, the development of a standard test is critical for assessing sheet metals’ formability enhancement due to ultrasonic vibrations, which can potentially unlock the material selection limit in various manufacturing applications. This study aims to present a method and apparatus for effectuating the forming limit diagram (FLD). At the same time, high-frequency ultrasonic vibrations are combined with the movement of the forming tool. Taking St14 steel as an example, the mechanical and microstructural properties such as formability, Micro-Vickers hardness, and grain sizes were systematically investigated. Furthermore, the conventional FLD, as well as the novel “Ultrasonic-Assisted Forming Limit Diagram” (UA-FLD), were attained and compared with a nonlinear regression-based approach. The results have indicated that superimposing ultrasonic vibrations with the amplitude of 15µm at the frequency of 20 kHz to the tool would cause a notable enhancement in forming limit diagram, a maximum of 28% increase in hardness, and a 23% reduction in average grain size of the specimens.

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Experimental and numerical investigation on forming limit curves of AA6082 aluminum alloy at high strain rates

Cited by 18 publications

References 35 publications

Mechanical Behavior and Microstructure Evolution during Hot Torsion Deformation of Aluminum Alloy AA2219

Mechanical Behavior and Microstructure Evolution during Hot Torsion Deformation of Aluminum Alloy AA2219

Strength Characterization of Soils’ Properties at High Strain Rates Using the Hopkinson Technique—A Review of Experimental Testing

A method and apparatus for determination of the ultrasonic-assisted forming limit diagram

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