WIRELESS CONTROL SYSTEM TECHNIQUE FOR EVALUATING THE BUCKLING BEHAVIOR OF 6061-T4 AL-ALLOY

Abstract

This research deals with the evaluation of buckling behavior for 6061-T4 aluminum
alloy under increasing compressive dynamic loads. Two types of columns, long, and the
intermediate columns were used. The number of specimens used in the dynamic axial
compression test were 9 samples .(1%) of the length column is the allowable lateral
deflection. For the purpose of calculating the initial deflection, the digital dial gauge was
used and the instrument was set at a distance of (0.7) of length from the fixed condition for
the column. A control system is designed to evaluate the critical buckling and to prevent
sample failure. The control system consists of a measuring circuit (transmitter circuit) with a
flex sensor installed at 0.7 of the total column length of the column's fixed condition. In
addition, the system contains a shutdown circuit (receiver circuit) to switch off the machine
at critical load with a mobile phone for the purpose of displaying deflection data. The
connection between the transmitter circuit and the receiver wirelessly through the RF sensor
and between the transmitter circuit and mobile phone also wirelessly via Bluetooth. The
results obtained were experimentally compared with the Perry-Robertson formula. It was
found that the Perry-Robertson formula was a good agreement with the experimental results
with a safety factor of (1.2) .