- A The Width Of Aircraft Inspection Panel Which Made Of 7074 T651 Aluminium Alloy Is 65 4 Mm Assuming The Material Pro 1 (28.04 KiB) Viewed 50 times
- A The Width Of Aircraft Inspection Panel Which Made Of 7074 T651 Aluminium Alloy Is 65 4 Mm Assuming The Material Pro 2 (10.31 KiB) Viewed 50 times
(A) The width of aircraft inspection panel which made of 7074-T651 aluminium alloy is 65.4 mm. Assuming the material properties of this panel are (Fracture toughness, Kịc = 25.8 MN m-3/2 and Yield stress, Gy = 505 MPa. During an inspection, an edge through-crack, a, of length 6.4 mm is found. If a cyclic stress of 90 MPa is applied on this plate. Determine the number of cycles to failure (N/) using Paris' Law. Taking A = 1.5x10-12 m/(MNm-3/2)" per cycle and m= 2.8, (Take Y = 1.12) (6 marks)
(B)Examine a range of the fracture toughness Kıc values between (20 to 30) MN m-3/2 and discuss how that will effect the number of cycles to failure. (6 marks)