STP1244: Validity of Small Specimen Fracture Toughness Estimates Neglecting Constraint Corrections

    Wallin, K
    Research Professor, VTT (Technical Research Centre of Finland) Manufacturing Technology,

    Pages: 19    Published: Jan 1995


    Historically, size criterions have been developed with the aim of guaranteeing specimen size independent fracture toughness values. The basis for the criterions have been different assumptions regarding the specimen constraint. Presently, it has become evident that for cleavage type fracture there exists a statistical size effect affecting the measured toughness in addition to constraint. In this work existing data bases are analyzed, considering the statistical size effect, but neglecting any corrections for constraint. It is shown that the validity of small bend specimen fracture toughness estimates is excellent, even with specimens that clearly violate even the least stringent size requirements.


    fracture toughness, brittle fracture, size criterions, constraint, validity, small specimens, size effects

    Paper ID: STP14650S

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP14650S

    CrossRef ASTM International is a member of CrossRef.