Characterization of Damage Mechanisms during Bending of 6xxx Aluminium Automotive Sheets

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

doi:10.1002/9781118495292.ch139

Cited by 1 publication

(4 citation statements)

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“…Two sets of experiments have been performed. First, four different 1 mm thick AA6xxx alloy sheets (T4 temper) were tested to failure using a standard bend test; their final punch displacements U f and bend angles β were measured and compared to large strain plastic flow behaviour [5]. The latter was characterized to strains of unity by plane strain compression tests on bonded samples [6].…”

Section: Resultsmentioning

confidence: 99%

“…δ describes hardening at small strains and the additional term αε p describes hardening at large strains. Table 1 shows that there is no clear correlation between bend failure and standard flow stress parameters [5]. Secondly, a detailed investigation of damage kinetics was performed on the standard AA6016 alloy of basic composition 1.05 Si, 0.24 Fe, 0.17 Mn and 0.39 Mg (in wt%).…”

Section: Resultsmentioning

confidence: 99%

“…Figure 3 The mechanical model used for the FE grain scale simulations of bending. 1 determined experimentally for the 4AA6xxx alloys by Mattei et al [5]. Different grain flow stresses are introduced by attributing different initial yield stresses σ 0 to each grain according to:…”

Section: Materials Science Forum Vols 794-796mentioning

confidence: 99%

“…Application to the bendability of four AA6xxx grades. This analysis is applied to a detailed study of the four AA6xxx alloys characterized experimentally [5].…”

Section: Grain Mechanical Behaviour Work Hardening Is Included During...mentioning

confidence: 99%

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Fundamentals of Bending AA6xxx Sheet

Mattei

Klöcker

Daniel

et al. 2014

MSF

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This paper describes recent experimental results on the strain distributions developed during bending of AA6xxx sheet for automotive applications, together with a new model for the mechanics and metallurgy of strain localization during bending. A detailed microscopic study (optical and SEM/EBSD) shows that damage development during bending to strains of order unity is controlled by through-thickness shear banding at the grain scale. A new finite element microstructure-based model is introduced to predict this strain localization during practical bending. The sheet metal is modelled as a grain aggregate, each grain having its own flow stress. After validation, the model is applied to the experimental results through an analysis of the critical plastic strain at the outer surface during bending of AA6016 sheet alloys. It correctly describes the respective influences of sheet thickness, grain size and shape, and work hardening. In particular the model brings out the primary importance of large-strain hardening and the spread of the flow stress distribution.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Materials Science Forum Vols 794-796mentioning

confidence: 99%

“…Application to the bendability of four AA6xxx grades. This analysis is applied to a detailed study of the four AA6xxx alloys characterized experimentally [5].…”

Section: Grain Mechanical Behaviour Work Hardening Is Included During...mentioning

confidence: 99%

See 2 more Smart Citations