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eng345

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I have to measure the compression strength of a porous ceramic body (d=L=10 mm) using advanced force gauge, mecmesin and don't have any experience with it. The simple procedure, which I followed, was to measure the force at which the sample started to break, divided by the cross section area of the sample. Can anybody explain me if this is the right method to measure the compression strength (Do I have to use the applied force at which first crack appears or I have to take the maximum applied force/continue to apply the force as long as the applied force can increase)? What is the scope of plotting stress-strain diagram for compression strength measurement?

Thanks in advanced