Experimental investigation of crack propagation mechanism in refill friction stir spot joints of AA6082-T6
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In: Engineering Fracture Mechanics, Vol. 300, 109963, 16.04.2024.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Experimental investigation of crack propagation mechanism in refill friction stir spot joints of AA6082-T6
AU - Becker, Niklaas
AU - dos Santos, Jorge F.
AU - Klusemann, Benjamin
N1 - Publisher Copyright: © 2024 The Author(s)
PY - 2024/4/16
Y1 - 2024/4/16
N2 - Since many aluminum alloys preferred in structural engineering can be welded conventionally only with great effort and energy input interest in alternative joining techniques is growing, such as solid state joining processes. In this work, the effect of refill friction stir spot welding (refill FSSW) on the crack propagation behavior in AA6082-T6 is studied. To be able to identify the individual fracture mechanism, refill FSSW was performed as a blind weld, i.e. only in one sheet designed as C(T)100 specimens. The vertical distance between notch and spot weld was varied and tested in two phases. First, a cyclic pre-crack was induced and then the specimen was caused to fail in quasi-static conditions, resulting in two different fracture modes. The results showed that the cyclic crack is dominated by residual stresses but the microstructure mainly influences the quasi-static crack propagation. It was also found that a stress concentration occurs in the transition area even without a hook. Furthermore, it was found that the crack propagation is not exclusively driven by the local strength but also by the angle at which the crack hits the spot weld.
AB - Since many aluminum alloys preferred in structural engineering can be welded conventionally only with great effort and energy input interest in alternative joining techniques is growing, such as solid state joining processes. In this work, the effect of refill friction stir spot welding (refill FSSW) on the crack propagation behavior in AA6082-T6 is studied. To be able to identify the individual fracture mechanism, refill FSSW was performed as a blind weld, i.e. only in one sheet designed as C(T)100 specimens. The vertical distance between notch and spot weld was varied and tested in two phases. First, a cyclic pre-crack was induced and then the specimen was caused to fail in quasi-static conditions, resulting in two different fracture modes. The results showed that the cyclic crack is dominated by residual stresses but the microstructure mainly influences the quasi-static crack propagation. It was also found that a stress concentration occurs in the transition area even without a hook. Furthermore, it was found that the crack propagation is not exclusively driven by the local strength but also by the angle at which the crack hits the spot weld.
KW - Engineering
KW - Refill friction stir spot welding
KW - Residual stress
KW - Crack propagation
KW - Fracture behavior
KW - Failure AA6082-T6
UR - http://www.scopus.com/inward/record.url?scp=85186266290&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/e9cd32ab-45e7-3d8e-8799-a7bfc01743c4/
U2 - 10.1016/j.engfracmech.2024.109963
DO - 10.1016/j.engfracmech.2024.109963
M3 - Journal articles
VL - 300
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
SN - 0013-7944
M1 - 109963
ER -