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  • 1985-1989  (2)
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  • 1
    facet.materialart.
    Unknown
    Hygrothermal effects on the mechanical behaviour of graphite fibre-reinforced epoxy laminates beyond initial failure (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The critical load levels and associated cracking beyond which a multidirectional laminate can be considered as structurally failed has been determined by loading graphite fiber-reinforced epoxy laminates to different strain levels up to ultimate failure. Transverse matrix cracking was monitored by acoustic and optical methods. The residual stiffness and strength parallel and perpendicular to the cracks were determined and related to the environmental/loading history. Within the range of experimental conditions studied, it is concluded that the transverse cracking process does not have a crucial effect on the structural performance of multidirectional composite laminates.
    Keywords: COMPOSITE MATERIALS
    Type: Composites (ISSN 0010-4361); 17; 23-32
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Failure of a laminated composite under tension-compression fatigue loading (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The fatigue behavior of composite laminates under tension-compression loading is analyzed and compared with behavior under tension-tension and compression-compression loading. It is shown that for meaningful fatigue conditions, the tension-compression case is the dominant one. Both tension and compression failure modes can occur under the reversed loading, and failure is dependent on the specific lay-up of the laminate and the difference between the tensile static strength and the absolute value of the compressive static strength. The use of a fatigue failure envelope for determining the fatigue life and mode of failure is proposed and demonstrated.
    Keywords: STRUCTURAL MECHANICS
    Type: Composites Science and Technology (ISSN 0266-3538); 36; 1, 19
    Format: text
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    NASA TECHNICAL REPORTS
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