Buckling Behaviour And Instability Of Tapered Column Made Of Aluminium Alloy

Norashid, Norjannahtul Ainah (2017) Buckling Behaviour And Instability Of Tapered Column Made Of Aluminium Alloy. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 Pages) Buckling Behaviour And Instability Of Tapered Column Made Of Aluminium Alloy.pdf - Submitted Version Download (570kB)

Abstract

Compressive members are typically found in most structural members. It is important to know the limits of material used since it can failed in two ways. In this study, the mode of buckling failure being investigated is limited to the elastic mode. Buckling only happens in long slender structural member well before experiencing plastic deformation. Before the plastic deformation, elastic failures such as yielding or crushing can also occur. The purpose of this study is to determine the critical buckling load of tapered column with different aspect ratios and how the end support conditions is influencing the buckling load and to compare with the analytical result. In this study, the material used for the specimen is Aluminium Alloy 6061 bar with square and round cross-sections. In preparing the specimens or columns, specified machining process need to be done to fulfill the required dimension of the specimen. The specimen tapered ratios used are 0.84 and 0.66 with length of 0.16m, 0.19m and 0.22m respectively. The buckling test is conducted by using INSTRON 5585 floor mounted material testing machine. The graph of buckling test obtained had been plotted in Load (kN) against Extension (mm). The loading rate used for the test is constant at 0.75/mm/min or equivalent to 0.0125/mm/sec. From the overall result, the critical buckling load for pinned-ended support is lower than pined-fixed support. The increase of buckling load also affected as the tapering ratio and effective length increases. Besides, different cross-sectional area give different reading of buckling load which is, square column have higher buckling load compared to circular column. However, there are significant differences between the experimental and theoretical results which is mainly affected by the surface condition of the column.

Actions (login required)

View Item