Abstract
Finite‐element analysis performed for the sliced glass rods exchanged by larger ions for various diffusion distances showed bulging of the cylindrical surface and concaving of the flat faces. Though these deformations result in the appearance of an apparent compression maximum at around 6 μm below the surface, they do not fully explain the presence of a compression maximum at 30‐ to 40‐μm depths observed by many workers using photoelastic techniques. Introduction of plasticity in the exchanged layers renders the computed stress profile to resemble the experimental profiles, but is followed with a decrease in the computed depth of the compression maximum. Lowering of the glass transition temperature of the exchanged layers, which results in increased stress relaxation and the superimposition of varying thermal contraction of the layers, could account for the disagreements.
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