Fatigue Frames







Crack Growth da/dN to ASTM E647 & BS 6835 performs a range of fatigue crack growth tests on any shape specimen 

The purpose of this test is to determine fatigue crack growth rates in materials from near threshold (crack arrest) to unstable levels of stress intensity (K).

The most common test piece geometries used are the compact tension (CT), centre cracked tension (MT), 3 point bend (SENB3) and 4 point bend (SENB4) specimens. However, any geometry specimen may be used provided that stress intensity (K) calibrations are available.

Continuous crack measurement is required and this is normally achieved using AC or DC potential drop equipment, or the changing compliance technique using a crack opening displacement (COD) gauge.

A sharp defect or precrack is generally introduced into the specimen prior to the crack growth test; this can be done within DMG's precrack software (see separate datasheet).

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