SYMPOSIA PAPER Published: 01 January 1979
STP35841S

Minimum Specimen Size for the Application of Linear-Elastic Fracture Mechanics

Source

The minimum thickness and the minimum ligaent width for the determination of plane-strain fracture toughness with linear-elastic methods can be considerably smaller than given by the ASTM Test for Plane-Strain Fracture Toughness of Metallic Materials (E 399-74). For the ligament width, the factor 2.5 in the size requirement equation can be replaced at least by 1, possibly by 0.4. The size dependence of KQ determined with the 5 percent secant method is due to plasticity at the crack tip and to the existence of a rising plane-strain crack growth resistance curve. With a variable secant, adjusted to the specimen width, it is possible to determine size-independent fracture toughness values.

Author Information

Munz, D
Deutsche Forschungs- und Versuchsanstalt fur Luft- und Raumfahrt, Cologne, FR, Germany
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Details
Developed by Committee: E08
Pages: 406–425
DOI: 10.1520/STP35841S
ISBN-EB: 978-0-8031-4739-3
ISBN-13: 978-0-8031-0330-6