Yield of blacksmith forging

How do i find out yield application of hammer hitting a specimen (just like blacksmith did? Since tresca law stated yieldmaterial<yield application to make deformation of specimen, yield of material for example 100MPa (high tempt yield) but yield application=F/A (assume force given is 600Newton, and A is hammer head area (assume 55x60 mm), so the yield of material is only 0,18 MPa, but the actual it does deformed. How can i prove that tresca law is right?
 
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Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
 

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