论文标题
初始裂纹深度与化学加强参数的竞争作用对铝硅酸盐玻璃的明显断裂韧性
The Competing Effect of Initial Crack Depth Versus Chemical Strengthening Parameters on Apparent Fracture Toughness of Sodium Aluminosilicate Glass
论文作者
论文摘要
由于其机械性和光学特性（透明度，介电等），铝硅酸钠玻璃在许多工程应用中广泛使用，近年来已经很普遍。但是，玻璃是一种脆性的材料，它易受骨折的脆弱性。已经使用了诸如热处理（热调回）或通过离子交换加强化学的过程来在玻璃上产生残留的应力轮廓，以提高其断裂强度。但是，仍会发生故障，这主要是灾难性的且修复昂贵的。因此，理解，预测并最终改善了化学加强玻璃的损伤或断裂的抵抗力对于设计新玻璃而在保持透明度的同时更加艰难。 The relationship between the glass residual stress parameters such as the compressive stress (CS), depth of compression layer (DOL), and central tension (CT) versus apparent (effective) fracture toughness for different crack depth was investigated in this study using a Silicon Carbide particle blast plus ring-on-ring (RoR) test method.结果还表明，通过化学强化改善玻璃的抗断裂性需要正确的CS，DOL和CT，这特别取决于初始/现有裂纹（缺陷）深度。据确定，对于涉及引入浅裂纹深度的损坏事件，就明显的断裂韧性而言，最佳抵抗性的标准比更深入的DOL更重视高CS，而对于深层的损害事件，它比高CS更为重。这些结果为工程应用中更健壮的玻璃设计提供了宝贵的信息。
The widespread use of sodium aluminosilicate glass in many engineering applications due to its mechanical and optical properties (transparency, dielectric, etc.), has become common in recent years. However, glass, a brittle material, has its vulnerability to fracture. Processes such as heat treatment (heat tempering) or chemical strengthening through ion-exchange have been used to create residual stress profiles on the glass, in a bid to improve its fracture strength. However, failure still occurs, which is mostly catastrophic and expensive to repair. Therefore understanding, predicting, and eventually improving the resistance to damage or fracture of chemically strengthened glass is important to designing new glasses that would be tougher while retaining their transparency. The relationship between the glass residual stress parameters such as the compressive stress (CS), depth of compression layer (DOL), and central tension (CT) versus apparent (effective) fracture toughness for different crack depth was investigated in this study using a Silicon Carbide particle blast plus ring-on-ring (RoR) test method. The results also showed that improving the fracture resistance of glass via chemical strengthening requires a proper combination of CS, DOL, and CT, which is particularly dependent on the initial/existing crack (flaw) depth. It was determined that for a damage event involving the introduction of a shallow crack depth, the criterion for optimal resistance to fracture, in terms of apparent fracture toughness, is weighted more towards a high CS, than deep DOL while for a deep flaw damage event, it is more weighted towards deep DOL, than a high CS. These results provide a valuable piece of information in the design of a more robust glass in engineering applications.
