STP857

    Low Temperature and Loading Frequency Effects on Crack Growth and Fracture Toughness of 2024 and 7475 Aluminum

    Published: Jan 1985


      Format Pages Price  
    PDF (236K) 17 $25   ADD TO CART
    Complete Source PDF (6.1M) 17 $55   ADD TO CART


    Abstract

    An experimental program was conducted to investigate the effect of low temperature (219 K [−65°F]) on the crack growth and fracture toughness of two aluminum alloys, 2024-T351 and 7475-T7651. Crack growth tests were performed with center-cracked panels and constant-amplitude and spectrum loadings. The spectrum represented a transport wing lower surface. The results show the 2024 alloy properties at low temperature to be equal to or better than the properties of that alloy at room temperature (RT), whereas some of the 7475 alloy properties decreased. In addition, tests were performed at RT and low temperature on 2024-T3 to evaluate the effect of loading frequency on crack growth. The results indicated a faster crack growth rate at lower frequencies.

    Keywords:

    crack growth, fracture toughness, low temperature, aluminum, fatigue tests


    Author Information:

    Abelkis, PR
    unit chief of structural mechanicsstaff engineer in structural mechanicsunit chief of materials and process engineeringsenior technical specialist in materials and process engineering, McDonnell Douglas Corporation, Douglas Aircraft Company, Long Beach, CA

    Harmon, MB
    unit chief of structural mechanicsstaff engineer in structural mechanicsunit chief of materials and process engineeringsenior technical specialist in materials and process engineering, McDonnell Douglas Corporation, Douglas Aircraft Company, Long Beach, CA

    Hayman, EL
    unit chief of structural mechanicsstaff engineer in structural mechanicsunit chief of materials and process engineeringsenior technical specialist in materials and process engineering, McDonnell Douglas Corporation, Douglas Aircraft Company, Long Beach, CA

    Mackay, TL
    unit chief of structural mechanicsstaff engineer in structural mechanicsunit chief of materials and process engineeringsenior technical specialist in materials and process engineering, McDonnell Douglas Corporation, Douglas Aircraft Company, Long Beach, CA

    Orlando, J
    unit chief of structural mechanicsstaff engineer in structural mechanicsunit chief of materials and process engineeringsenior technical specialist in materials and process engineering, McDonnell Douglas Corporation, Douglas Aircraft Company, Long Beach, CA


    Paper ID: STP32760S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP32760S


    CrossRef ASTM International is a member of CrossRef.