Strain localization and damage mechanisms during bending of AA6016 sheet

Mattei, Laurent; Daniel, D. Joseph; Guiglionda, Gilles; Klöcker, Helmut; Driver, J.H.

doi:10.1016/j.msea.2012.09.028

Cited by 53 publications

(17 citation statements)

References 25 publications

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“…Mattei and co-workers [59,60] characterized bendability of 6016T4 sheet metal by the standardized Daimler-Chrysler (DIN 50 111). The test set-up is shown in Figure 14.…”

Section: Hemming Of Aluminum Automotive Sheetsmentioning

confidence: 99%

“…The apparent rigidity (dF/dU) plotted in Figure 15b exhibits a clear maximum at 0.92 U f . A crack develops "suddenly" at a punch displacement of 0.92 U f corresponding to the maximum of the overall rigidity [60]. Crack formation during a standard bend test occurs when the overall rigidity attains a maximum.…”

Section: Hemming Of Aluminum Automotive Sheetsmentioning

confidence: 99%

“…Crack formation during a standard bend test occurs when the overall rigidity attains a maximum. Mattei et al [60] compared the bendability of samples with an industrial surface finish and mirror polished samples. Initial surface roughness (undulations) favors the strain localization.…”

Section: Hemming Of Aluminum Automotive Sheetsmentioning

confidence: 99%

See 2 more Smart Citations

Aluminum Sheet Metal Damage Mechanisms Application to Trimming and Hemming

Klöcker¹,

Yukna²

2017

Aluminium Alloys - Recent Trends in Processing, Characterization, Mechanical Behavior and Applications

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Aluminum alloys are increasingly used in automotive structural applications thanks to their combination of low density, high strength, and good formability. Appropriate strength levels for dent resistant automotive aluminum panels may be achieved by a combination of alloy design and thermo-mechanical treatments. Unfortunately, increased strength (hardness) generally limits homogeneous plastic deformation. Thus, when shaping complex components large deformation and eventually strain localization, necking and final failure is more likely to occur. In this chapter, we endeavor to explore the best compromises between increased hardening and satisfying formability. Sheet metal shaping generates large strains and eventually strain localization. The accurate measure of metal behavior is discussed first. The following section is dedicated to the kinetics of damage development during shaping. Then metal ductility at low stress triaxiality and consequent strain localization are discussed. Finally, trimming and hemming, the most complex shaping operations to perform efficiently are analyzed providing a powerful tool for alloy design.

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“…Mattei and co-workers [59,60] characterized bendability of 6016T4 sheet metal by the standardized Daimler-Chrysler (DIN 50 111). The test set-up is shown in Figure 14.…”

Section: Hemming Of Aluminum Automotive Sheetsmentioning

confidence: 99%

Section: Hemming Of Aluminum Automotive Sheetsmentioning

confidence: 99%

See 1 more Smart Citation

Aluminum Sheet Metal Damage Mechanisms Application to Trimming and Hemming

Klöcker¹,

Yukna²

2017

Aluminium Alloys - Recent Trends in Processing, Characterization, Mechanical Behavior and Applications

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“…The bendability of the sheet can be investigated using various operation [20,27]. In the framework of this study, 3 − point bend test is used to define the bending angle [6].…”

Section: Failure Due To Bendingmentioning

confidence: 99%

Modeling of localization and fracture phenomena in strain and stress space for sheet metal forming

et al. 2015

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In this study, a model based on a strain localization level to overcome the shortcomings of the wellestablished Forming Limit Diagram (FLD) in predicting the physical phenomenon of necking is introduced. An optical measurement system was used to capture the strain history of the Nakazima experiment until rupture occurred. In order to measure the fracture strain more accurately, a further method is introduced, which is based on the microscopic measurements of ruptured regions. This model is validated using a 3-point bending test. The results show the ability of the method to predict failure under bending conditions as well. Additionally, failure is investigated based on the pressure sensitivity and the Lode dependency. The results show that the triaxiality at the failure point is independent of the loading path.

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“…During the experiment process, specimen is bent to 10mm, 5mm and 3mm, respectively, and relevant test are carried out under the different bend radius condition. The DIC technology is used to characterize the strain evolution of interested region during deformation, and data are recorded during different stages of deformation [16][17][18]. The data of DIC require contain features obviously, as shown in Fig.2.…”

Section: Introductionmentioning

confidence: 99%

Study of Strain characterization and microstructure evolution under compression stress in Al-Li alloy

Jin¹,

Zhang²,

Xue³

et al. 2018

Proceedings of the 2017 4th International Conference on Machinery, Materials and Computer (MACMC 2017)

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Abstract:The strain variation and microstructure evolution of 2060-T8 alloy during bending are investigated by Micro-hardness point method (MHPM) and Digital Image Correlation (DIC), electron backscattered diffraction (EBSD). Experimental result shows DIC method can be used to characterize the strain micro-region on average and it can also represent the local strain tensor in the micro-region compared to the traditional MHPM. The strain is unevenly distributed in grains due to the mis-orientation between the adjacent grains difference, the mis-orientation has a blocking effect on the slip of dislocations during deformation in polycrystalline sample. The result shows the mis-orientation between adjacent grains is smaller with larger strain, while the mis-orientation between adjacent grains is larger with smaller strain. The degree of grain division in the process of deformation is related to the strain in this region, a new microstructure such as band structure is observed in grains with larger strain.

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Strain localization and damage mechanisms during bending of AA6016 sheet

Cited by 53 publications

References 25 publications

Aluminum Sheet Metal Damage Mechanisms Application to Trimming and Hemming

Aluminum Sheet Metal Damage Mechanisms Application to Trimming and Hemming

Modeling of localization and fracture phenomena in strain and stress space for sheet metal forming

Study of Strain characterization and microstructure evolution under compression stress in Al-Li alloy

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