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Civen that\left(D_{0}\right) Outedianates =300 \mathrm{~mm}, Jumer diander =200 \mathrm{~mm}\left(D_{I}\right)R_{0}=150 \mathrm{mn}, \quad R_{i}=100 \mathrm{~m}If thickenen of cylindes is greater than 1 / 20 times of interual diamatr, Then it is called thick Cylinder.When Thickccylider is subjected to - External fressure, the hoop stres is given as\begin{array}{l}\sigma_{n}=-P \times \frac{R_{0}^{2}+R_{i}^{2}}{R_{0}^{2}-R_{i}^{2}} \\\sigma_{n}=-P+\left(\frac{1 S_{0}^{2}+100^{2}}{155_{0}^{2}-100^{2}}\right) \text { For AIs1 } 1015 \text { Steel tube } \\\sigma_{n}=-2.6 P . \quad, \quad S_{y t}=S_{y c}=600 \text { Mpa }\end{array}Fev safe design\begin{array}{l}\sigma_{h}<s_{y} t \\2.6 P<600 \\p<230.76 M_{p a}\end{array}fo tha Maximu presunc =230.76 \mathrm{Mpa}. Aly ...