- #1

mylovelyamber

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**1. given that the yield stress σy of the material is 475 Mpa, internal radius ri is 24.47mm, internal pressure pi is 6.07 Mpa, external pressure po is atmospheric, find the thickness required of the cylinder such that it does not undergo failure. (ro≥ r ≥ri)**

**2. σr = [(pi ri^2 - po ro^2) / (ro^2 - ri^2)] + [ri^2 ro^2 (po - pi) /**

**r**^2 (ro^2 - ri^2)]**3. I set σr=σy/1.5 and Po as 101.325 kPa**

i also set

i sub the values into the calculation but the value of ro that i get is the same as ri, which is not possible.

i also set

**r=ro**i sub the values into the calculation but the value of ro that i get is the same as ri, which is not possible.

can someone please enlighten me what i should set as r?