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17. A part is made of cast iron with the following strength properties, $S_{ut}=15ksi$ and $S_{uc}=$ $109ksi$. Suppose at the candidate trouble spot a static stress state exists such that $?_{x}=12ksi$ and $?_{y}=10ksi$. By an appropriate failure theory, the safety factor is $n=$ 18. Repeat the preceding problem, but now assume that the stress state is $?_{x}=?12ksiand?_{y}=?10ksi.n=?$ 19. Repeat the preceding problem, but now assume that the stress state is $?_{x}=12ksi$ and $?_{y}=?10ksi$. $n=$

In this problem given data Sut That is why we assume material is brittle, For brittle material most appropriate failure theory is maximum principal st