The effect of the riveting process and aging on the mechanical behaviour of an aluminium self-piercing riveted connection

The joining of two aluminium plates with an aluminium self-piercing rivet, as discussed by Hoang et al. (2010), showed that heating to soften the plates to be joined might be used to avoid plastic compression or fracture in the rivet. In the present paper, the mechanical behaviour of self-piercing r...

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Vydáno v:European journal of mechanics, A, Solids Ročník 30; číslo 5; s. 619 - 630
Hlavní autoři: Hoang, N.-H., Langseth, M., Porcaro, R., Hanssen, A.-G.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Amsterdam Elsevier Masson SAS 01.09.2011
Elsevier
Témata:
AA6063
AA7278
Aging (natural)
Aluminium
Aluminium self-piercing rivet
Aluminum
Aluminum base alloys
Exact sciences and technology
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Heat treatment
Inelasticity (thermoplasticity, viscoplasticity...)
Joints
Mechanical behaviour
Modelling
Natural aging
Physics
Plates
Pre-straining
Riveted joints
Riveting
Solid mechanics
Structural and continuum mechanics
Testing
Aluminium self-piercing rivet
AA7278
Natural aging
Modelling
Pre-straining
Testing
Mechanical behaviour
AA6063
Constitutive equation
Heat treatment
U shape
Fastener
Modeling
Finite element method
Riveted joint
Tempering
Material testing
Pretreatment
Rivet
Aluminium base alloys
Ageing
Rupture
Mechanical properties
Aluminium
Boring
Plate
Heat source
Strain hardening
Flow stress
ISSN:0997-7538, 1873-7285
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Shrnutí:The joining of two aluminium plates with an aluminium self-piercing rivet, as discussed by Hoang et al. (2010), showed that heating to soften the plates to be joined might be used to avoid plastic compression or fracture in the rivet. In the present paper, the mechanical behaviour of self-piercing riveted connections using an aluminium rivet was investigated. Two U-shaped specimens in alloy AA6063-W, obtained by a solution heat treatment of the alloy in temper T4, were joined using an aluminium self-pierce rivet in alloy AA7278-T6. The mechanical behaviour of these connections was tested after 3 and 30 days of natural aging of the riveted specimens. Test results showed that the strength of the aluminium riveted joints tended to stabilize after three days of natural aging. In order to evaluate the process effect (i.e. the effect of the pre-straining of the plates in W temper as the result of the riveting process, and the subsequent natural age-hardening of the plates) on the mechanical properties of the riveted connection, a comprehensive material test programme was carried out. Test results revealed that there is an interaction between the pre-straining and natural aging which lowers the material properties in terms of the flow stress compared to the ‘virgin’ material, i.e. the curve obtained after heat treatment and aging only. Then, the process effect on the mechanical behaviour of the riveted connections was investigated more closely by using a 3D-model generated in LS-DYNA. The combined effect of the pre-straining and natural aging was accounted for in the numerical analyses by means of a user-defined constitutive model. Numerical analyses revealed that it is necessary to consider the combined effect of plastic deformation and aging in order to predict the mechanical behaviour with a reasonable accuracy.
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ISSN:0997-7538
1873-7285
DOI:10.1016/j.euromechsol.2011.02.006