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Class 20 and class 60 gray cast irons have tensile strengths of about 20 ksi and 60...

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Mechanical Engineering

Class 20 and class 60 gray cast irons have tensile strengths ofabout 20 ksi and
60 ksi, respectively. Assuming that the fractures start fromgraphite flakes and that
the flakes act as preexisting cracks, use the concepts of theGriffith analysis to predict
the ratio of the average graphite flake sizes of the two castirons.

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