PERILAKU RAMBAT RETAK DI DAERAH LUBANG YANG TEREKSPANSI PADA ALUMINIUM ALLOY
ABSTRACT: Mechanism of crack
propagation is done by loading the cycle against the perforated metal material
will be difficult to avoid, to fatigue crack growth rate can be a way to expand
its peg with the hole that normally uses metal balls as an alternative. By using
a materials testing machine type cantilever bending eccentric crank, life time
of the materials are determined. Research using the method of cold expansion
hole in the aluminum alloy metal material to a hole with a diameter of 5 mm in
expansion using pin with variation of 5,1 mm, 5,15 mm and 5,2 mm made
that crack found on the side of the hole would be difficult to propagate due to
residual stress comparison. The result shows that there are residual stresses
around the hole which varies depending on the diameter of the pin. In addition,
there is growing tensile residual stress within a certain distance of the
specimen being tested resulted in a faster growth rate, this causes the
material usage time will be shorter.
Keywords: cold expansion hole,
materials testing machine, aluminumalloy, comparison residual stress, life time
Penulis: Syahrizal, Anindito
Purnowidodo, Rudy Soenoko
Kode Jurnal: jptmesindd140188
