ANALISIS FATIGUE FAILURE SUHU RENDAH STRUKTUR BATANG DURALUMIN DENGAN MESIN SIKLUS BENDING
ABSTRACT: Generally non-iron
metals use in industries, including aluminum alloy, because of their high
strength to weight ratio and favorable (no sparking and high corrosion
resistance). Aluminum alloy are often found and used in airplane. Recently,
aluminum alloy begins so popular in cryogenic system where it is highly applied
at oil industry, low temperature operated, and automotive industry. It is
estimated that 50%-90% mechanical failures are due to fatigue failure. This
research attempts to predict duralumin fatigue resistance at low temperature
and to understand the effect of micro structure on duralumin at low
temperature. Several states, which include 15, 30, and 45 in MPa, are given to
bending cycle machine. The tested material is duralumin (alloy Al-Cu) which has
passed the tests over porosity, fatigue level at low temperature (-19o C) and
room temperature (27o C), microstructure, fractography, and macrostructure.
Result of research indicates that fatigue resistance increases with lowering
work tense at specimen. Average fracture of duralumin fatigue at low
temperature is more than 17,8 x 10 cycles, while at room temperature is 13 x 10
5 cycles. During low temperature fatigue test, microstructure shows long and
small grains. The deformation during low temperature fatigue test cause smaller
grain produce greater slip resistance for specimen.
Penulis: Nanang Tawaf, Wahyono
Suprapto, Anindito Purnowidodo
Kode Jurnal: jptmesindd140201
