ASTM E647 covers the determination of fatigue crack growth rates from near-threshold to Kmax controlled instability. Results are expressed in terms of the crack-tip stress-intensity factor range (DK), defined by the theory of linear elasticity. Several different test procedures are provided, the optimum test procedure being primarily dependent on the magnitude of the fatigue crack growth rate to be measured. Materials that can be tested by ASTM E647 are not limited by thickness or by strength so long as specimens are of sufficient thickness to preclude buckling and of sufficient planar size to remain predominantly elastic during testing.
By means of our fatigue 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 E647.
Recommended Test Machine
Static and fatigue forces up to 50 kN (11,250 lbf)
Frequency ratings up to 75 Hz
Oil-free, all electric actuator for clean test conditions
Lower purchase, operating, and maintenance costs than hydraulic equivalents
Static and fatigue forces up to 25 kN (5,500 lbf)
Frequency ratings up to 100 Hz
Servohydraulic
Small, portable footprint
Recommended Testing Accessories
Rated from -40°C to 150°C (-40°F to 300°F)
Clevis design
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)
Clevis design
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
Standard temperature range of -155°C to 620°C (-247°F to 1150°F)
Accompanied by a broad set of accessories that are capable of withstanding the heat or cold
PID controlled internal temperature
Mounts directly to the test frame
