QUESTION 8A small component is made from aluminium 7475 where Kc = 35.2 MPa m 1/2Non-destructive testing by micro-computed tomography showed the component to contain cracks of up to 2a = 0.05 mm in length. Laboratory tests showed thecrack growth rate under cyclic loading is given by:Where A= 1.10x10-13Assuming that:dadN=ΑΔΚΑ(MN m-2)-4 m-1 and the component is subjected to an alternating stress of range A = 180 MPa about a mean tensile stress of 40/2.ΔΚ =ΔονπαCalculate the number of cycles to failure, give your answer in number of 1000s of cycles to 3 significant figures (e.g. 101,000 cycles would be inputted as 101)

Given: The maximum crack length, a = 0.05/2 mm = 0.025 mm

QUESTION 8 A small component is made from aluminium 7475 where Kc = 35.2 MPa m 1/2 Non-destructive testing by micro-computed tomography showed the component to contain cracks of up to 2a = 0.05 mm in length. Laboratory tests showed the crack growth rate under cyclic loading is given by: da dN = ΑΔΚΑ Where A= 1.10x10-13 (MN m-2)-4 m-1 and the component is subjected to an alternating stress of range A = 180 MPa about a mean tensile stress of A0/2. Assuming that: ΔΚ = Δσ πα

QUESTION 8 A small component is made from aluminium 7475 where Kc = 35.2 MPa m 1/2 Non-destructive testing by micro-computed tomography showed the component to contain cracks of up to 2a = 0.05 mm in length. Laboratory tests showed the crack growth rate under cyclic loading is given by: da dN = ΑΔΚΑ Where A= 1.10x10-13 (MN m-2)-4 m-1 and the component is subjected to an alternating stress of range A = 180 MPa about a mean tensile stress of A0/2. Assuming that: ΔΚ = Δσ πα

Elements Of Electromagnetics

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Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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