Progress on the Standard Test Technology of Quasistatic Fracture Toughness for Metallic Materials

doi:10.3901/JME.2016.08.076

Abstract

Abstract: The quasistatic fracture toughnesses are key parameters in the integrity assessment of structures containing cracks, so the revision of testing specification for these parameters can evidently reflect the technological level in the field of fracture toughness testing. In view of complicated fracture mechanics background and long-standing short of financial support, the national self-renovation in the revision of fracture toughness testing specification slips far behind international level. From the project determination in 2011, the revision of testing specification GB/T 21143-2014 has been completed in 3 years, and greatprogresses have been made in comparison with the original version. The main revision of the new specification contains a simplified formula of crack length estimation on the basis of compliance principle has been provided; the formulae for the calculation of J integral and CTOD have been improved; a new rotational correction method considering the large rotation effect on the fracture toughness determination has been recommended; by referring to ASTM E1820-11, a modified single specimen normalization method has been introduced. In order to promote the widespread application of this new specification, the progress of those related key techniques in this revision is reviewed in detail.

Key words: compliance method, GB/T21143-2014, quasistatic fracture toughness, revision of testing specification, rotation correction, single specimen load separation method

CLC Number:

O346

BAO Chen, CAI Lixun, SHI Kaikai, DAN Chen, YAO Yao. Progress on the Standard Test Technology of Quasistatic Fracture Toughness for Metallic Materials[J]. Journal of Mechanical Engineering, 2016, 52(8): 76-89.

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