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.
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October 2003
Technical Papers
Control of Damage in Composite Laminates by Ply-Stacking Designs: Characteristic Failure Signatures and Safety Criteria
Vasyl Michael Harik, Mem. ASME
Vasyl Michael Harik, Mem. ASME
ICASE, MS 132C, NASA Langley Research Center, Hampton, VA 23681-2199
11
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Vasyl Michael Harik, Mem. ASME
11
ICASE, MS 132C, NASA Langley Research Center, Hampton, VA 23681-2199
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.
J. Eng. Mater. Technol. Oct 2003, 125(4): 385-393 (9 pages)
Published Online: September 22, 2003
Article history
Received:
January 10, 2003
Revised:
June 17, 2003
Online:
September 22, 2003
Citation
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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