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Optimal Design of Prestressed Laminate/Ceramic Plate Assemblies

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Abstract

It is well known that the dynamic compressive strength of ceramics is enhanced by confining compressive stress. The paper shows how a biaxial in-plane compressive stress can be induced in a ceramic layer by encapsulation in a fiber-prestressed composite laminate. Optimal prestress distribution in individual plies of the laminate is found, together with the resulting residual stresses. Large compressive stress, 600–1000 MPa can be supported in an alumina layer by aramid/epoxy or carbon/epoxy laminates of the same total thickness as the ceramic. Stress relaxation due to either temperature changes or matrix creep is found to be of minor significance. Examples present results for specific material systems and laminate layups.

Sommario. E'ben noto che la resistenza dinamica dei materiali ceramici viene migliorata dal confinamento degli sforzi di compressione. Questo lavoro mostra come uno stato piano di compressione biassiale possa essere indotto in uno strato di materiale ceramico imprigionandolo in un laminato composito con fibre presollecitate. Viene determinata la distribuzione ottimale delle presollecitazioni nei singoli strati del laminato, nonché l'entità degli sforzi residui risultanti. Compressioni elevate, dell'ordine di 600–1000 Mpa, possono essere indotte in uno strato di allumina da laminati epossidici rinforzati con fibre aramidiche o carboniche dello stesso spessore. Il rilassamento degli sforzi dovuto a cambiamenti di temperatura o al comportamento viscoso della matrice risulta avere importanza limitata. Gli esempi forniscono risultati relativi a specifici materiali e orientamenti dei laminati.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, NY, 12180-3590, U.S.A

    Alexander P. Suvorov & George J. Dvorak

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  1. Alexander P. Suvorov
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  2. George J. Dvorak
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Suvorov, A.P., Dvorak, G.J. Optimal Design of Prestressed Laminate/Ceramic Plate Assemblies. Meccanica 36, 87–109 (2001). https://doi.org/10.1023/A:1011909301910

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