Assessing Formability of Sheet Metals through Advanced Tensile and Laser Speckle Analysis

Shabadi, Rajashekhara; Roven, Hans Jørgen; Kumar, Surendra; Dwarakadasa, E. S.

doi:10.4028/www.scientific.net/msf.396-402.1623

Cited by 3 publications

(5 citation statements)

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“…The band propagation was viewed by a special set-up, called the laser speckle analyser [11][12][13]. Here, a laser beam is used as the source of radiation and it is expanded in order to cover the entire gauge length.…”

Section: Laser Speckle Techniquementioning

confidence: 99%

Characterisation of PLC band parameters using laser speckle technique

Shabadi

Kumar

Roven

et al. 2004

Materials Science and Engineering: A

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Section: Laser Speckle Techniquementioning

confidence: 99%

Characterisation of PLC band parameters using laser speckle technique

Shabadi

Kumar

Roven

et al. 2004

Materials Science and Engineering: A

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“…17,18 Shabadi el al. [17][18][19][20][21] have investigated the band width and velocity in similar materials using laser speckle techniques. The band width is usually in the a naturally aged specimens; b peak aged specimens 5 0 .…”

Section: Stress Serrations and Strain-time Relationshipsmentioning

confidence: 99%

“…The occurrence of PLC deformation bands have been mathematically derived by Penning 8 and Kubin and Estrin 16 and have been observed experimentally in numerous cases. 17,18 Shabadi el al. 17 The stair case serrations observed in Fig.…”

Section: Stress Serrations and Strain-time Relationshipsmentioning

confidence: 99%

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Temperature and strain rate dependence of the dynamic strain aging effect in an Al–Zn–Mg alloy

Hörnqvist¹,

Karlsson²

2006

Materials Science and Technology

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An AA7030 alloy (Al-5 . 4Zn-1 . 2Mg) was tested for evidence of dynamic strain aging in naturally aged and peak aged condition and under varying conditions in terms of strain rate and temperature. Clear evidence in terms of strain rate sensitivity, serrated yielding (Portevin-Le Chatelier effect) and propagative plastic instabilities was observed in the naturally aged temper while the peak aged temper only showed serrated yielding. Further evidence of dynamic strain aging was the temperature and strain dependence of the strain rate sensitivity, which can be explained by the additional dislocation activation energy resulting from solute pinning. Investigation of the specimen surfaces was carried out to reveal an orange peel structure with pronounced glide bands. Small cracks within individual grains rather than grain boundary cracking could be observed.

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“…The alloy AA7030 has been shown earlier to exhibit strong DSA effects in naturally aged [1][2][3] and solution treated [4][5][6][7][8] conditions, while weak effects were found in the peak-aged material [1][2][3]8].…”

Section: Introductionmentioning

confidence: 99%

Dynamic strain ageing and dynamic precipitation in AA7030 during cyclic deformation

Hörnqvist

Karlsson

2010

Procedia Engineering

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The effects of dynamic strain ageing (DSA) and dynamic precipitation (DP) on the stress strain response during low-cycle fatigue of naturally aged (NA) and peak-aged (PA) AA7030 alloy at different temperatures was investigated. The results show that the PA temper is largely unaffected by DSA/DP, and the cyclic deformation behavior is controlled by the accumulation of dislocations and strain localization due to repeated shearing of precipitates. In the NA temper, on the other hand, the effect of temperature on DSA and DP is the main mechanism controlling the stress strain response. At temperature above room temperature, DP in the intense slip bands inhibits cyclic softening and the samples harden until the on-set of crack growth. At lower temperatures, the rate of DP is too slow to compensate for the softening in the slip bands and the stress amplitude saturates or decreases. The stress amplitude development is shown to primarily be a result of the evolution of the effective stress associated with dislocation precipitate interactions.

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Assessing Formability of Sheet Metals through Advanced Tensile and Laser Speckle Analysis

Cited by 3 publications

References 0 publications

Characterisation of PLC band parameters using laser speckle technique

Characterisation of PLC band parameters using laser speckle technique

Temperature and strain rate dependence of the dynamic strain aging effect in an Al–Zn–Mg alloy

Dynamic strain ageing and dynamic precipitation in AA7030 during cyclic deformation

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