Structural designs for composite laminated systems can be optimized for a fail-safe in-service performance by introducing the built-in cumulative-damage-indicators for the progressive degradation of material properties. This design methodology is based on the concepts of the characteristic failure signature (CFS), cumulative-damage states and a load-drop sequence that characterize the stress-strain response and progressive accumulation of damage. The cumulative damage mechanics is based on the three-dimensional laminate analysis that is used to predict nonlinear response of composites, accumulation of damage and failure behavior. An earlier-developed nonlinear analysis involves an incremental formulation that couples the three-dimensional laminate analysis with a progressive ply-failure methodology, which has been tested in the World-Wide Exercise on Composites Failure Theories. The failure signatures are shown to have unique “safety features” that depend on the ply stacking sequence and predominant loading. To refine the analysis of micromechanical damage a model for the macro-to-micro coupling is introduced. Various examples of failure envelopes, characteristic failure signatures, a safety criterion and the “safe” CFSs that lead to the desired controlled failures are discussed for symmetric balanced laminates.
Control of Damage in Composite Laminates by Ply-Stacking Designs: Characteristic Failure Signatures and Safety Criteria
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division January 10, 2003; revision received June 17, 2003. Associate Editor: A. Pelegri and A. Karlsson.
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Harik, V. M. (September 22, 2003). "Control of Damage in Composite Laminates by Ply-Stacking Designs: Characteristic Failure Signatures and Safety Criteria ." ASME. J. Eng. Mater. Technol. October 2003; 125(4): 385–393. https://doi.org/10.1115/1.1605771
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