Characterization of Susceptibility of Metallic Materials to Environmentally Assisted Cracking

  • Maahn, Ernst Emanuel (Project Manager)
  • Sørensen, Tonny (Project Participant)
  • Dietzel, Wolfgang (Project Participant)
  • Mortensen, Peter Bo (Project Participant)

    Project Details

    Description

    The main objective of this project is to develop a test procedure for the qantitative characterization of the susceptibility of structural materials to environmentally assisted cracking (EAC).The procedure will be an extension of an existing ISO standard. The main advantage of the new test procedure over the existing standard will be:
    -The threshold parameter can be evaluated at shorter testing times.
    -Precise and detailed guidance is given concerning all steps of the test procedure.
    -The strict requirements with respect to specimen dimensions imposed by the currently existing standards and drafts are avoided.
    -Cases of environmental cracking in which dynamic straining is a prerequisite for the occurrence of failure are taken into account.
    The main research tasks are:
    1)Specify the conditions under which the parameters for quantitative characterizasion of the susceptibilityof a structural material to EAC (KIscc, da/dt) can be determined in a fracture mechanics based test procedure. This procedure may comprise static loading of the specimens as is being recommanded in the existing standards and drafts or it can be based on a dynamic loading procedure according to the current draft proposal worked out by the ESIS TC 10, or on any other type of dynamic loading such as step loading.
    2) Find criteria that can help to decide whether the measured threshold value is the "true" threshold value of a material/environment system.
    3) Elaborate guidelines for an accelerated SCC test procedure which is based on a rising displacement type of experiment, which can serve as a modification of the existing ISO standard 7539-6 and which can also be the basis of a future CEN standard for SCC testing.
    StatusFinished
    Effective start/end date01/01/199431/12/1997

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