It was conducted on Monday, 17/2/2025, in the Dr. Ihsan Yahya Hall in the mechanical Engineering Department. The discussion of the master’s thesis of the student Shahad Nashat Subhi, which is tagged:
“The Influence of Variation of Cyclic Wind Loading on the Dynamic Crack Propagation in Flat Plate Aircraft Wing”.
The discussion committee consisted of names listed below:
1- Prof. Dr. Faiz F. Mustafa (Chairman)
2- Prof. Dr. Qasim A. Atiyah (Member)
3- Lect. Dr. Muayad M. Idan (Member)
4- Prof. Dr. Fathi A. Al-Shamma (Supervisor)
This study investigates the impact of wind loads on crack growth in aluminum alloy wings, focusing on the effect of the angle of attack (AOA). Two conditions were analyzed: flight (AOA = 5°) and landing/takeoff (AOA = 10°). The research compares AL2024-T3 and AL7075-T6 to determine the alloy with better crack resistance and durability. Experimental work involved tensile tests, optical emission spectrometry (OES), hardness tests, and multiaxial cyclic loading to evaluate mechanical properties. Test specimens were fabricated using wire electrical discharge machining (WEDM). A newly developed apparatus was used to study dynamic crack propagation under cyclic in-plane shear and constant tensile loading.
Accordingly, the thesis included recommendations including:
- The dynamic crack propagation increases with crack length and is higher at AOA = 10° than at AOA = 5°. AL7075-T6 exhibits faster crack growth.
- AL2024-T3 proved to be the more suitable alloy for aircraft wings requiring high fatigue resistance.
After the scientific discussion by the members of the discussion committee, the researcher received a rating of (Excellent).
