How to determine fracture toughness Kic from a punch test?

AI Thread Summary
To determine fracture toughness (Kic) for aluminum using a punch test, the load-displacement curve and specimen dimensions are essential. While formulas for brittle materials are available, specific equations for ductile materials like aluminum are less common. The discussion highlights the need for a reliable method to adapt existing formulas or derive new ones suitable for ductile behavior. Participants are encouraged to share insights or references that could assist in this calculation. Understanding the differences in material properties is crucial for accurate fracture toughness assessment.
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I am looking to determine fracture toughness for aluminium, from a punch test. I have the dimensions of the specimen and the load-displacement curve of the test. I have seen how to calculate Kic for brittle materials from a punch test but am struggling to find a formula for ductile materials such as aluminium.

thanks
 
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