Volume 5, Issue 3 (May 1977)

    Estimating Plane Strain Fracture Toughness of High Strength Aluminum Alloys from Crack Arrest Toughness

    CODEN: JTEOAD

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    Abstract

    A comparison is made between fracture toughness KIc as measured by recommended ASTM procedures and crack arrest toughness KIa as measured on more than 100 bolt-loaded double-cantilever beam (DCB) specimens from 7075, 7050, and 7049 alloy plates. Close agreement was found between the two values, KIa being on the average about 0.75 ksiin. (0.82 MPa√m) lower than than KIc over the range 18 to 29 ksiin. (20 to 32 MPa√m). This indicates that a simplified test based on a bolt-loaded DCB specimen could be used for quality control, lot release, and screening purposes. Measurements of crack length and specimen deflection are all that are required; the specimens do not have to be fatigue precracked, nor is a tensile machine needed.


    Author Information:

    Dorward, RC
    Research metallurgists, Kaiser Aluminum & Chemical Corp., Center for Technology, Pleasanton, Calif.

    Hasse, KR
    Research metallurgists, Kaiser Aluminum & Chemical Corp., Center for Technology, Pleasanton, Calif.


    Stock #: JTE11634J

    ISSN: 0090-3973

    DOI: 10.1520/JTE11634J

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    Author
    Title Estimating Plane Strain Fracture Toughness of High Strength Aluminum Alloys from Crack Arrest Toughness
    Symposium , 0000-00-00
    Committee E08