Fatigue Crack Growth by Hans Albert Richard & Manuela Sander

Author:Hans Albert Richard & Manuela Sander
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

5.1.1.2 Minimum Specimen Dimensions

In order to carry out tests in accordance with ASTM E 399-09, the specimen’s dimensions must satisfy the following condition:

(5.1)

where R p0.2 corresponds to 0.2 % of the yield strength of the material given the environmental conditions, orientations and temperature of the test.

In addition, the dimensions of the specimens must be selected in such a way that the ratio w/t of specimen width w to thickness t is two. It is sensible in some cases to select a ratio of 2 ≤ w/t ≤ 4 for specimen dimensions with the exception of the bending specimen. The ratio w/t of the bending specimen should be between 1 ≤ w/t ≤ 4.

For the specimen dimensions, the fracture toughness can either be estimated or, for a durctile material, calculated using the ratio of the yield limit to the elasticity modulus (Table 5.1). However, the crack length must be checked after a K IC test and, if necessary, the test must be performed again with an adapted specimen.Table 5.1Minimum recommended residual ligament for K IC tests [2]

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