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K1c to BC 7448 and ASTM E399 allows automatic analysis and verification of results 

The K1C test determines the fracture toughness of brittle metallic materials in accordance with international Standards. The test is performed on ductile materials.

The test consists of growing a crack within a specimen of a defined geometry which has had a sharp defect or fatigue precrack introduced into it.

The most common specimen geometries used are the stepped notch compact tension (CT) and 3 point bend specimens. Of these, the CT specimen is the more popular due to its economical use of material and simplicity of tooling.

Specimens are made to specified proportions with recommended sizes; a minimum thickness is required depending on the material.

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