Biaxial Strength Behavior of Glass-Reinforced Polyester Resins

    Published: Jan 1982

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    Numerous strength theories have been proposed for fiber-reinforced materials. After preliminary consideration. 14 of these have been applied to the behavior of glass fabric and woven roving fabric reinforced polyester resin under both biaxial and fatigue loading. Results from 350 tube tests reveal that the failure mode depends on the biaxial stress ratio, fatigue life, and material combination. The distinction between failure theories tends to be obscured by scatter in the results. The scatter is caused mainly by thickness variation arising from the wet lay-up technique. Accordingly strength and life results were related to a particular thickness rather than average values. The fit of failure theories to experimental data tends to deteriorate with increasing fatigue life, and only three of the theories considered offered a reasonable design basis up to 106 cycles. One of the resin systems was more flexible than the other and gave substantially enhanced static tensile strength to the laminates. This benefit was not transferred to the laminates under tension-compression conditions or under fatigue conditions.


    glass fabric, polyester resin, biaxial strength, failure theory, static loading, fatigue loading

    Author Information:

    Owen, MJ
    Professor of Reinforced Plastics and Research Assistant, University of Nottingham,

    Rice, DJ
    Professor of Reinforced Plastics and Research Assistant, University of Nottingham,

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP28478S

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