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Breaking thick cast iron

Breaking thick cast iron

Breaking thick cast iron

(OP)
Hello, I need to size reduce cast 10" thick cast iron plates using an attachment on the end on an excavator for a nuclear decomissioning.  What material properties can I use to determine the amount of impact energy from a jackhamemr it would require.  Also, what material properties can I use to determine the amount of compressive stress the cast iron will take before it fractures?  Thank you very much.   

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