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Sandblasting aluminium sheet

Sandblasting aluminium sheet

Sandblasting aluminium sheet

(OP)
Can anyone explain why aluminium sheet (2mm) deforms outwards from the centre (bulges) after sandblasting?

Cheers, Andyc (not a materials scientist)

RE: Sandblasting aluminium sheet

This is just a guess. The sheet will have residual stresses caused from forming, kind of like surface tension. The sandblasting will reduce the residual stress on the one side leaving a stress imbalance and causing the sheet to bulge upwards.

RE: Sandblasting aluminium sheet

It deforms because there is a lot of friction.  This friction causes heat which in turn causes the deformation.  

Flores

RE: Sandblasting aluminium sheet

Hush has it backwards - sand blasting causes residual stresses, which distorts the part.  This effect also occurs during shot peening - the only difference is the size/mass/composition of the projectile.

RE: Sandblasting aluminium sheet

I knew I was on the right track, just couldn't remember which way it worked.

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