There is a road sign given on the right. The solid aluminum plate, written fuzzi

Question

There is a road sign given on the right. The solid aluminum plate, written fuzzime is 3 m wide, 2 m long and 1 cm thick. You are required to design a 6 m vertical pipe given on the right which can endure winds up to 100 kmph in average but the wind can change its speed suddenly by plusminus50 kmph. The vertical pipe is cold drawn and hollow which has a constant 10 cm inner diameter and has a constant outer diameter throughout the whole length. During the summer time the local temperature can rise up to 60 C. Reliability factor should be at least 99% At the bottom of the vertical pipe, due to the connection necessities, there is a grave which has a radius of 3 mm. This radius cause a static stress concentration of kt = 1.8 The material of the vertical pipe is Also 1018 cold drawn steel tubing. Assume the connecting of the vertical pipe at the connecting of the vertical pipe at the bottom is fixed to the ground. Use modified Goodman theory. Take a factor of safety of 5 due to human factor, Assume the truss pipe is weightless. Calculate the minimum outer diameter of the pipe for infinite life!. Calculate the minimum outer diameter of the pipe for 10.000 cycle!

Explanation / Answer

it's D*sqrt((yield point stress of the hub materiel+coefficient*hub side pressure)/((yield point stress of the hub materiel-coefficient*hub side pressure)

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