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This paper presents experimental work on quasi static compression tests on aluminum AA 6063 circular and square tubes. Specimen tubes with ratio of R/t = 12 and b/t = 24 for circular and square tubes respectively were prepared and validated with several analytical model developed by previous researchers. Two definitions of flow stress were used for validate the test result, first were proposed by Abramowicz and Jones (Wierzbicki & Abramowicz, 1983), defined as mean stress between yield stress and ultimate tensile stress. Secondly, using ultimate tensile stress as flow stress. For circular tubes test result is in better agreement with the analytical model by Guillow et al. (Guillow, Lu, & Grzebieta, 2001) using ultimate tensile stress as flow stress. Meanwhile for square tubes, test result agrees better with the analytical model by Abramowicz and Jones (Abramowicz & Jones, 1984a) using flow stress as the mean stress between yield stress and ultimate tensile stress.

Quasi Static Axial Compression of Thin Walled Aluminum Tubes: Analysis of Flow Stress in the Analytical Models