A 2014-T6 aluminum spar in an airframe is expected to support an alternating loa

Question

A 2014-T6 aluminum spar in an airframe is expected to support an alternating load ranging between 32 kN and -32 kN at a frequency of (2.5x10^1)cycles/hour. If the spar has a cross sectional area of 10 mm x 20 mm, how many hours will the spar last based on the data in the graph provided? Express your answer as X.X x 10^Y hours. Note: Your answer is assumed to be reduced to the highest power possible.

A 2014-T6 aluminum spar in an airframe is expected to support an alternating load ranging between 32 kN and -32 kN at a frequency of (2.5x10^1)cycles/hour. If the spar has a cross sectional area of 10 mm x 20 mm, how many hours will the spar last based on the data in the graph provided? Express your answer as X.X x 10^Y hours. Note: Your answer is assumed to be reduced to the highest power possible.

Explanation / Answer

PLEASE RATE THE ANSWER

stress = load / area = 32000/200*10-6

stress = 160 Mpa

for 160 MPa, from the graph , the no.of cycles before breaking = 107

so

t*2.5*101 = 107

t = 4.0*105 hours .. -------------ANSWER

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