Determination of local constitutive properties of aluminium friction stir welds using digital image correlation

Leitão, C.; Galvão, Ivan; Leal, Rui M.; Rodrigues, D.M.

doi:10.1016/j.matdes.2011.07.009

Cited by 136 publications

(49 citation statements)

References 21 publications

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“…It is assumed that the local cross-sectional area A i in the necking zone is related to the real-time plastic strain ε i at the moment i, namely [8] ( )…”

Section: Parameter Identification Methodsmentioning

confidence: 99%

Identification of Constitutive Parameters of Laser Welded Aluminum Alloy Using Digital Image Correlation

Wei¹,

Lei²,

Bai³

2017

dtmse

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Abstract. An inversion identification method of local wise elastic-plastic constitutive parameters for laser welding of aluminum alloys 6061 was proposed based on full-field optical measurement data using digital image correlation (DIC). Three regions, fusion zone, heat affected zone and base zone of the laser welded joint were distinguished by means of microstructure optical observation and micrometer hardness measurement. The stress data was obtained by the laser welded specimen under uniaxial tensile test, meanwhile, the local strain data of the laser welded specimen was measured by the DIC technique, so the stress-strain relationship for different local regions was established. At last, the constitutive parameters of Ramberg-Osgood model were identified by least-square fitting to the experimental stress-strain data. Experimental results reveal that the mechanical properties for the local zones of welded joint are obviously weakened, which are consistent with the hardness measurement.

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“…It is assumed that the local cross-sectional area A i in the necking zone is related to the real-time plastic strain ε i at the moment i, namely [8] ( )…”

Section: Parameter Identification Methodsmentioning

confidence: 99%

Identification of Constitutive Parameters of Laser Welded Aluminum Alloy Using Digital Image Correlation

Wei¹,

Lei²,

Bai³

2017

dtmse

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“…The tests were carried out, at room temperature, using a testing speed of 5 mm min À1 . Strain data acquisition was performed, using ARAMIS Optical 3D Deformation & Strain Measurement system, according to the procedures explained elsewhere [13].…”

Section: Methodsmentioning

confidence: 99%

Study of the welding conditions during similar and dissimilar aluminium and copper welding based on torque sensitivity analysis

et al. 2012

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“…During testing, the GOM Aramis 5M system was used for strain data acquisition by Digital Image Correlation (DIC). Local stress-strain curves, for different weld zones, were plotted following the practices described in Leitão et al [20,21]. The fatigue strength of the welds was evaluated in tensile-shear loading with a 10 Hz frequency, a stress ratio of 0.01 and stress ranges varying from 30 to 150 MPa.…”

Section: Figure 1 Fsw Tool Geometry (Dimensions In Mm)mentioning

confidence: 99%

“…Using the procedures detailed in Leitão et al [20], local true stress-strain curves were plotted. In Figure 6 the local stress-strain curves for the Thermomechanical Affect Zone (TMAZ) of the welds performed at welding speeds of 350 mm/min and 1000 mm/min, in the as-welded and age-hardened conditions, are compared with those of each base material.…”

Section: /42mentioning

confidence: 99%

Influence of the Aluminium Alloy Type on Defects Formation in Friction Stir Lap Welding of Thin Sheets

2018

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Abstract:The weldability in Friction Stir Lap Welding (FSLW) of heat and non-heat treatable aluminium alloys, the AA6082-T6 and the AA5754-H22 aluminium alloys, respectively, are compared. For both alloys, welds were produced in very thin sheets, using the same welding parameters and procedures, and strong differences in welds morphology were found. The strength of the welds was evaluated by performing tensile-shear tests under monotonic and cyclic loading conditions. As-welded and heat-treated samples of the AA6082-T6 were tested. It was found that the heat-treatable alloy is more sensitive to defects formation, in lap welding, than the non-heat-treatable alloy. The presence of defects has a strong influence on the monotonic and fatigue behaviour of the welds. In spite of this, for very high-applied stresses, the heat-treatable alloy welds perform better in fatigue than the non-heat-treatable alloy welds.Key-words: FSW; Weldability; Aluminium alloys; Defects; DIC. Influência do Tipo de Liga de Alumínio na Formação de Defeitos em Soldaduras em Chapas Finas Unidas por Friction Stir Lap WeldingResumo: No presente trabalho são comparadas as soldabilidades de duas ligas de alumínio: a liga AA6082-T6, tratável termicamente, e a liga AA5754-H22, não-tratável termicamente. Foram produzidas soldaduras, em chapas finas, pelo processo Friction Stir Lap Welding (FSLW). Concluiu-se que apesar da utilização dos mesmos parâmetros e procedimentos de soldadura, as soldaduras produzidas nas duas ligas apresentavam diferenças morfológicas consideráveis. A resistência mecânica das soldaduras foi avaliada através da realização de ensaios de tração e de fadiga. Por se tratar de uma liga tratável termicamente, as soldaduras produzidas na liga AA6082-T6 foram também testadas após tratamento térmico. Concluiu-se que a liga tratável termicamente tem maior propensão para a formação de defeitos, na ligação em junta sobreposta, do que a não-tratável termicamente. A presença de defeitos tem uma grande influência no comportamento das soldaduras, nos ensaios de tração e fadiga. Observou-se que, para as cargas de solicitação mais elevadas, a liga tratável termicamente apresentou uma maior resistência à fadiga do que a não-tratável termicamente.Palavras-chave: FSW; Soldabilidade; Ligas de alumínio; Defeitos; DIC.

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Determination of local constitutive properties of aluminium friction stir welds using digital image correlation

Cited by 136 publications

References 21 publications

Identification of Constitutive Parameters of Laser Welded Aluminum Alloy Using Digital Image Correlation

Identification of Constitutive Parameters of Laser Welded Aluminum Alloy Using Digital Image Correlation

Study of the welding conditions during similar and dissimilar aluminium and copper welding based on torque sensitivity analysis

Influence of the Aluminium Alloy Type on Defects Formation in Friction Stir Lap Welding of Thin Sheets

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