Glass samples of two different chemical compositions were strengthened by ion exchange. Residual stress profiles were experimentally determined by differential surface refractometry. The experimental results were compared with values theoretically predicted by a formalized viscoelastic mathematical model incorporating both stress buildup and stress relaxation contributions. The comparison exhibited a remarkable agreement both in terms of strengthening characteristics and stress profiles curves between experimentally measured and theoretically predicted values. The mathematical model incorporated terms directly linked to selected relaxation mechanisms either isochoric shear stress driven and fast relaxation. The comparison demonstrated the relevance of the stress relaxation mechanisms for the different glass chemical compositions. The approach presented in this study will allow the prediction of the mechanical behavior of chemically strengthened glass starting from its chemical composition together with the ion exchange process parameters.

中文翻译：

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离子交换钠钙硅酸盐玻璃和铝硅酸钠玻璃中的应力：实验和理论比较

通过离子交换增强了两种化学成分不同的玻璃样品。残余应力分布是通过差示表面折射法通过实验确定的。将实验结果与结合了应力累积和应力松弛贡献的形式化粘弹性数学模型理论预测的值进行了比较。在实验测量值和理论预测值之间的增强特性和应力分布曲线方面，该比较显示出显着的一致性。数学模型结合了与选定的松弛机制直接相关的术语，这些机制是等速切应力驱动的和快速松弛的。比较证明了应力松弛机制对于不同玻璃化学成分的相关性。