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sssooo

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## Homework Statement

A long circular steel tube having a mean diameter of 254 mm and 3.2 mm wall thickness is subjected to an internal pressure of 4.83 MPa. The ends of the tube are closed. The yield stress of the steel is 227 MPa. Find the additional axial tensile load F which is needed to cause yielding of the tube, based on the von Mises criterion and Tresca criterion, respectively.

## Homework Equations

...[/B]v.M = sqrt(sigma^2 + 3*tau^2) - sigma_y0 = 0 where sigma is the stress and tau is the shear stress. sigmay_0 is the yield stress.

**2. The attempt at a solution**

Well, actually I am not entirely sure how to start this. Anyhow I try I get an answer of the load about ten times higher than the answer (v.M which should be 395 kN).

So I guess I am entirely wrong and would probably just need a hint on how I should procede with the problem.

My solid mechanics certainly need refreshed.I attempt that

So I calculate tau by multiplying the pressure with the diameter and dividing by 2 times thickness. then I solve the equation.

So I guess my actual question is to refresh my solid mechanics for this type of question (the problem is in a constitutive modelling course...)

PS; Sorry about lack of latex...