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
- Start by preparing the sample as described in the standard.
- Measure the width and thickness of the notched sample and document it.
- Load the sample into the fixture. Attach the displacement gauge to the crack opening of the specimen.
- Apply the load as described in the standard.
- 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
Depending on your samples, we recommend either our servohydraulic 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.
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.
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Recommended Testing Accessories
Designed in accordance to ASTM E399, E647 and E1820
Available in many sizes
Rated from -40°C to 150°C (-40°F to 300°F)
Maximum specimen widths from 12.7 mm to 50.8 mm (0.50 in. to 2.00 in>)
Pin diameters from 12.7 mm to 50.8 mm (0.50 in. to 2.00 in.)
Rated from ambient temperature to 900°C (1,650°F)
Maximum specimen widths of 12.7 mm or 25.4 mm (0.50 in. or 1.00 in.)
Pin diameter of 12.7 mm (0.50 in)
Measures displacement between the two mounting arms
All models capable of operating at frequencies of at least 50 Hz
All standard models rated between -40°C to 100°C (-40°F to 210°F)
Wide range of specimen sizes available
Span length and roller diameter are customizable to meet your sample requirements
Force capacity is customizable to meet your test requirements
All standard models rated between 0°C to 70°C (32°F to 158°F)
Fits a wide range of specimen sizes