MECH 4003 Lecture Notes - Lecture 1: Zirconium

• School: Carleton University
• Department: Mechanical Engineering
• Course: MECH 4003
• Professor: wing

Document Summary

5 lower wing structures are fabricated from 2xxx alloys (al cu) while upper wing structures are fabricated from 7xxx alloys (al zn mg). (a) realizing that the upper wing is predominantly a compressive structure and the lower wing is predominantly a tensile structure, what is the reason for the different alloy selection for these two applications. (b) briefly explain why the difference in toughness and strength between the 2xxx and 7xxx alloys occurs. How many cycles will the material tolerate when stress cycles. A material has threshold cyclic stress intensity kth of 2. 5mpa m1/2. Sttress intensity equation for the thin walled pressure vessel of this problem is a. Explain why s n data provides insufficient information for use in applications utilizing a damage tolerant design. 6 7 (a) a through crack in a thick plate is of initial length 2ao=15 mm. Crack growth is approximately described by the paris law with a=6. 9x10 12 m/cycle and m=3 and k expressed in.