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ASTM E399 Linear-Elastic Plane-Strain Fracture Toughness (K1c) Testing of Metallic Materials

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ASTM E399 Linear-Elastic Plane-Strain Fracture Toughness (K1c) Testing of Metallic Materials

ASTM E399 is used to determine the fracture toughness (KIc) of metallic materials under predominantly linearly-elastic, plane-strain conditions. This method uses fatigue pre-cracked specimens having a thickness of 1.6 mm (0.063 in) or greater.

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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 pre-cracking. Additional annexes are provided that give specific procedures for beryllium and rapid-force testing.

ASTM E399 Test Procedure

  1. Start by preparing the sample as described in the standard. 
  2. Measure the width and thickness of the notched sample and document it.
  3. Load the sample into the fixture. Attach the displacement gauge to the crack opening of the specimen. 
  4. Apply the load as described in the standard.
  5. Continue testing until the applied force on the sample has reached the maximum force it can withstand. Record the maximum force.

In order to record the load versus crack mouth opening displacement, measure the size of the crack after fracture, at mid-thickness, two quarter-thickness positions on the crack front and at the intersection of the crack front with the specimen surface.

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ASTM E399 Test Equipment

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TestResources has the test equipment that you need in order to perform ASTM E399 effectively. Our expert engineers will help you find the right equipment for your test and budget. We offer universal test machines, fatigue test machines, grips, fixtures and other accessories that are designed in strict accordance with ASTM E399. Contact us to find the solution that is right for you.