7. (15 points) An aircraft structural member made out of 7075-T6 aluminum has a rectangular cross...

 

 

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7. (15 points) An aircraft structural member made out of 7075-T6 aluminum has a rectangular cross section as shown in the figure below: a 40 mm 15 mm A quarter circular corner crack of size a=0.5mm is present and the member is subjected to a constant tension stress S perpendicular to the plane. How many cycles between = 336 MPa and = -68 MPa can be applied before failure is expected? (Assume the constants for the Paris equation to be C= 2.7 X and m=3.46 respectively) 7. (15 points) An aircraft structural member made out of 7075-T6 aluminum has a rectangular cross section as shown in the figure below: a 40 mm 15 mm A quarter circular corner crack of size a=0.5mm is present and the member is subjected to a constant tension stress S perpendicular to the plane. How many cycles between = 336 MPa and = -68 MPa can be applied before failure is expected? (Assume the constants for the Paris equation to be C= 2.7 X and m=3.46 respectively)