STP610

    Crack Growth in Heavy Section Titanium

    Published: Jan 1976


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    Abstract

    The integrity of structures that operate in the marine environment depends on both the resistance to the propagation of cracks and the resistance to fracture that are inherent to the structural material. Diagrammatic procedures have been established to analyze systematically the material thickness-stress level-defect size interactions that are implied by the basic characterizations and their relation to various types of structures. In the case of titanium alloys, the extremely rapid growth of stress-corrosion cracks in salt water effectively precludes the possibility of design use of the crack-growth rates; for this reason the design problem reduces to selection of materials to prevent stress-corrosion cracking (SCC) and to minimize corrosion-fatigue crack growth. In this paper, the results of experiments conducted for structural integrity analyses of two 2-in.-thick titanium alloys are presented to illustrate the procedures currently used to measure the basic properties of structural titanium alloys and to interpret these characterizations for structural behavior. One of the test materials was highly sensitive to salt water SCC and the other was immune. Use of the SCC Ratio Analysis Diagram concept as a framework for interpretation of the fracture resistance and SCC resistance of these materials is also illustrated.

    Keywords:

    stress corrosion, crack propagation, titanium alloys, fracture properties, environments, corrosion fatigue


    Author Information:

    Judy, RW
    Head, Structural Mechanics Section, and head, Strength of Metals Branch, Naval Research Laboratory, Washington, D. C.

    Goode, RJ
    Head, Structural Mechanics Section, and head, Strength of Metals Branch, Naval Research Laboratory, Washington, D. C.


    Paper ID: STP28671S

    Committee/Subcommittee: G01.06

    DOI: 10.1520/STP28671S


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