STP836

    Influence of Prescribed Delaminations on Stiffness-Controlled Behavior of Composite Laminates

    Published: Jan 1984


      Format Pages Price  
    PDF Version (188K) 13 $25   ADD TO CART
    Complete Source PDF (4.9M) 13 $55   ADD TO CART


    Abstract

    The effect of delaminations on the stiffness-controlled behavior of laminated composites is investigated. Four panels of [±45,0,90]2s quasi-isotropic layup are fabricated from the T300/Narmco 5208 material system, three with prescribed delaminations of different rectangular shapes and orientations. Nondestructive buckling tests and vibration experiments are conducted on these panels with clamped-free and clamped-simple support boundary conditions to assess the stiffness-controlled behavior. Free-free vibration tests are also conducted to study the influence of delamiantions on higher modes. Finite-element analyses are performed to compare with the experimental results. The findings indicate that delaminations of the size considered can be tolerated for some service conditions without dire consequences.

    Keywords:

    composite materials, fatigue (materials), fracture mechanics, composite laminates, composite structures, defects, delaminations, compressive buckling, vibration


    Author Information:

    Reddy, AD
    Senior research engineer, professor, and research assistant, School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, Ga.

    Rehfield, LW
    Senior research engineer, professor, and research assistant, School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, Ga.

    Haag, RS
    Senior research engineer, professor, and research assistant, School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, Ga.


    Paper ID: STP30198S

    Committee/Subcommittee: E08.01

    DOI: 10.1520/STP30198S


    CrossRef ASTM International is a member of CrossRef.