CORROSION – BUCKLING INTERACTION OF 6061-T4 AL ALLOY FIXED – PINNED COLUMNS – EXPERIMENTAL STUDY

Abstract

Compression buckling experimental tests was carried out for long and intermediatecolumns made of 6061-T4 AL- alloy. Two different soil corrosion time were adopted i.e.30days and 60 days using 27 samples. The experimental analysis revealed that increasing thecorrosion time negatively affects the mechanical properties of metals such as the specimensof 60 days corroded have 1.68% reduction in ultimate strength, also increasing the corrosiontime reduces the critical load such as the maximum reduction was 4.24% in critical bucklingload for 60 days corrosion time. Perry-Robertson theory was applied to the experimentaldata and it was found that the above theory can satisfactory predicted the critical bucklingload (Pcr) with a factor of safety equal to 1.2. The ratio of corroded Pcr to dry Pcr wasalways less than unity. This indication explains the effect of pitting corrosion on bucklingbehavior of 6061-T4 AL- alloy