ASTM E399 is a testing standard that covers the determination of fracture toughness (KIc) of metallic materials under predominantly linearly-elastic, plane-strain conditions. This method uses fatigue pre-cracked specimens having a thickness of 0.063 in. or greater.


When testing according to this method, take the metallic specimens and subject them to slowly, or in special (elective) cases rapidly, increasing crack-displacement force. ASTM E399 is divided into two parts: The first part gives general recommendations and requirements for Klc testing. The second part consists of Annexes that give specific information on displacement gage and loading fixture design, special requirements for individual specimen configurations, and detailed procedures for fatigue precracking. Additional annexes are provided that give specific procedures for beryllium and rapid-force testing.

Depending on your samples, we recommend either our Servo Hydraulic Fatigue Test Machine or a simpler universal testing machine. Additionally, you may consider our wide range of testing fixtures and grips to go with your machine. By means of our testing expertise and modular product design, we will help find the testing solution that is right for you. Give one of our application engineers a call today for help with creating the best budget and testing plan according to ASTM E399.

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