Aluminum grain direction

Schliebe · Aug 25, 2005

Does Aluminum plate stock (7075) have a grain direction that is significant enough to make a differance as to which direction a part should be made?

A286 · Aug 25, 2005

Aluminum plate (thickness >.250 inch) has three grain orientations, each with their own strength values. The three orientations are: the long tranverse (LT), the short transverse (ST) and the longitudinal (L).

for example: (from MIL-HDBK-5)7075-T62, 2.501-3.000 thick stock, ultimate tension allowable stress is L=67 ksi, LT=70 ksi and ST=66 ksi.

(edited for spelling)

winchman · Aug 25, 2005

This PDF has an explanation of the terminology used in the previous reply.

http://www-glast.slac.stanford.edu/MechanicalSystems/Analysis/References/NASA/stress-corr-crck-msfc-spec-522b.pdf

Look at the illustrations on page 11.

Roger

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Aluminum grain direction

Schliebe

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A286

Plastic

winchman

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