- 期刊
- OpenAccess
Corrosion Effects on Low Cycle Fatigue (LCF) Life of Aluminum 2024-T3
摘要
The environmental conditions in Malaysia contribute towards material deterioration. High humidity, salty environment and high temperature are the main conditions that provide a corrosive environment throughout the year as stipulated in the MIL-STD-810H standard. In general, flight operation for the Royal Malaysian Air Force (RMAF) greatly exposes their military aircraft to cyclic loading and fatigue under corrosive conditions. For fighter aircraft, the fatigue life design is often based on the Low Cycle Fatigue (LCF). Meanwhile, the study of corrosion fatigue is unique depending on location and complexity. Based on this notion, this study aimed to investigate the impact of corrosion on LCF life of Aluminum 2024-T3. The aluminum specimens first underwent tensile test to determine their static mechanical properties according to ASTM E8M. Some specimens were then exposed to Salt Spray Chamber Test, which induced the corrosive and salty environment according to ASTM B117, for intervals of 48, 96, 144 and 168 hours. At every interval, several specimens were removed and sent for the LCF Test at strain amplitudes of 3.3%, 5.0%, 6.7% and 11.0%. The results revealed a significant decrease in LCF life for corroded specimens compared to non-corroded specimens. Interestingly, the effect of corrosion on the LCF life became less noticeable at high strain levels, suggesting that post-yielding buckling modes took precedence as the dominant failure mechanism.