The Effects On Mechanical Properties of 2024 Aluminum Alloy Due To Corrosion
Date Issued
2010
Date
2010
Author(s)
Lin, Yu-Shu
Abstract
2024-T3 Aluminum alloy is a wildly-used material in aerospace, for it’s high strength and low density, but with a low-corrosive resistance. This study tries to find out the effects on mechanical properties of 2024-T3 Aluminum alloy due to corrosion, which is based on an accident “ CI 7552-77cm crack accident” investigated by Aviation Safety Council (ASC) . This experiment is separated into three parts: static corrosion, stress corrosion cracking and corrosion fatigue. In static corrosion, we prepare tensile specimens which are exposed to different corrosive environments, then construct the relative stress-strain curve after tensile test to check whether the tensile strength changes due to corrosion, and discuss how it has changed for different environment factors. In stress corrosion cracking, we introduce the “tensile stress” factor in addition to the previous corrosive environments, discuss the effects on mechanical properties under corrosive environments when the tensile stress is added. In corrosion fatigue, we prepare standard CT specimens and miniature fatigue specimens, then through observing the crack grows, compare the difference in crack growth rate between non-corrosive environments and corrosive environments, and compare the results between CT specimens and miniature specimens, as well, for checking the usage and practicability of miniature fatigue specimen testing.
Subjects
2024-T3 Aluminum
Stress Corrosion Cracking
Corrosion Fatigue
fatigue crack growth
miniature fatigue specimens
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