Abstract:Countersunk riveted joints in aluminum sheet are widely employed in the aircraft industry. The preparation of the sheet for the riveting process consists either of countersinking where the sheet is sufficiently thick or of dimpling. Metallographic assessment of dimple defects is described in specimens made of clad aluminum sheet of alloy type AlZnMgCu1.5. Addressed are a dimple with partially missing stamped surface (bell-mouth), a cylindrical prominence because the dimpling force was too great and the stampin… Show more
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