残余应力增强硅酸盐玻璃：压缩深度与表面缺陷稳定性条件
Strengthened Silicate Glasses by Residual Stress: Depth of Compression and Surface Flaws Stability Conditions
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中文总结 AI 辅助
本研究采用断裂力学框架，结合权函数法建立了硅酸盐玻璃表面缺陷稳定性准则，评估了残余应力与外部应力的相互作用，为其在严苛环境下的应用提供了强度评估依据。
中文摘要 AI 辅助
硅酸盐玻璃在严苛服役环境中的应用，需要精准评估其在机械载荷和表面摩擦学条件下的结构强度。由于玻璃强度由表面缺陷和微裂纹而非本征材料属性决定，由内部拉伸区平衡的表面残余压应力场被广泛用于抑制缺陷扩展。本研究未采用传统许用应力准则建立产品验收标准，而是采用基于应力强度因子KI和基本材料极限的断裂力学框架：即用于快速断裂的临界应力强度因子KIC，以及用于延迟静态疲劳失效的阈值应力强度因子KIth。采用权函数法（WFM），针对承受非均匀内部残余应力场和外部载荷的二维连续（2D-Continuous）表面裂纹，评估了不同通用表面缺陷深度下的KI。为零风险和中等风险设计方法建立了缺陷稳定性准则，最后评估了外部施加的机械应力和热应力与内部残余应力场的相互作用及叠加效应。
英文摘要
The application of silicate glasses in severe service environments requires a precise evaluation of structural strength under mechanical loads and surface tribological conditions. Because glass strength is governed by surface flaws and microcracks rather than being an intrinsic material property, residual surface compression fields, balanced by interior tensile zones, are widely implemented to inhibit flaw opening. Rather than relying on conventional allowable stress criteria to establish product acceptance, this study adopts a fracture mechanics framework based on the stress intensity factor KI and fundamental material limits: the critical stress intensity factor KIC for rapid fracture and the threshold stress intensity factor KIth for time-delayed static fatigue failure. Using the Weight Function Method (WFM), KI is evaluated across generic surface flaw depths for two-dimensional continuous (2D-Continuous) surface cracks subjected to non-uniform internal residual stress fields and external loads. Flaw stability criteria are established for both zero-risk and moderate-risk design methodologies. Finally, the interaction and superposition of externally applied mechanical and thermal stresses with internal residual stress fields are evaluated.
发表机构
- Isoclima SpA – R&D Department（伊斯科克拉公司研发部）
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