Fracture Toughness of Fatigue-Damaged Steel Specimens,

reportActive / Technical Report | Accession Number: ADA081841 | Open PDF

Abstract:

The plane strain fracture toughness K sub Ic of a material is used to describe the crack tip conditions required for unstable growth of a crack, and is used extensively in designing metallic components and in assessing the severity of pre-existing defects. There are many situations in service, however, where the crack tip stress conditions immediately prior to unstable crack growth are not identical to those in a standard fracture toughness test specimen. This report examines the fracture toughness of high-quality gun steel, and describes conditions under which the fatigue pre-cracking levels specified for K sub Ic tests may produce unreasonably high values of K sub Ic, leading to an increased possibility of in-service fracture of components designed using these values. Author

Author(s):
Clark, Graham
Author Organization(s):
MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
Pagination:
0020

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
MRL-R-749
 Subject Terms
Joint Capability Areas:
JCA_6.4.1_Secure Information Exchange; JCA_6_Net Centric; JCA_6.4_Information Assurance; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_4.6_Engineering
Communities of Interest:
Air Platforms
Descriptor(s):
*DAMAGE, *TEST METHODS, *STEEL, *FATIGUE, STRESSES, FOREIGN TECHNOLOGY, TOUGHNESS, STRAIN(MECHANICS), FRACTURE(MECHANICS), CRACK PROPAGATION, DEFECTS(MATERIALS), AUSTRALIA
Field(s)/Group(s):
Metallurgy and Metallography, Mechanics
Keyword(s):
Crack tip conditions, Gun steels, Test specimens
Report Date:
1979 Jun 01