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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Deformation and cracking behavior of glasses indented with diamond tips of various sharpness
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Deformation and cracking behavior of glasses indented with diamond tips of various sharpness

机译：带有各种尖锐度的金刚石尖端的玻璃的变形和开裂行为

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The indentation response of glasses is termed normal, anomalous, or in some cases intermediate depending on the deformation mechanism and cracking response of the glass. A typical normal glass, e.g. soda-lime silicate, deforms to a large extent by a shearing mechanism and forms median/radial and lateral cracks when indented with a Vickers tip. A typical anomalous glass, e.g. fused silica, deforms primarily by densification and has a high tendency to form ring/cone cracks that can accompany median/radial and lateral cracks when indented with a Vickers tip. Intermediate glass types take on some characteristics of both normal and anomalous behavior when indented with a Vickers tip. These intermediate glasses deform with more densification and less shear than normal glasses, but do not form the ring/cone cracks typical of anomalous glasses. Glasses with this intermediate behavior require high loads to initiate crack systems originating in subsurface, i.e. median/radial and lateral cracks. It is demonstrated that the deformation and cracking response of glasses is dependent on both glass structure and contact geometry. As contacts become sharper the deformation mechanism transitions toward plastic deformation, i.e. shear, for all glass types. On the other hand, blunter contacts promote greater densification. The transition from normal to anomalous deformation and cracking behavior is shown for each glass type by indenting with a series of four-sided pyramidal indenter tips with angles of 100°, 110°, 120°, 136° (Vickers), 150°, 160°, and 170°.
机译：根据玻璃的变形机理和破裂响应，玻璃的压痕响应被称为正常，反常或在某些情况下为中间。典型的普通玻璃，例如钠钙硅酸盐会在剪切机制下发生很大程度的变形，并在用维氏尖端压痕时形成正中/径向和横向裂纹。典型的异常玻璃，例如熔融石英，主要通过致密化而变形，并且很容易形成环形/圆锥形裂纹，当用维氏针头压入时会伴随中线/径向和横向裂纹。当用维氏针头压痕时，中型玻璃具有正常和异常行为的某些特征。与普通玻璃相比，这些中间玻璃具有更高的致密性和较小的剪切变形，但不会形成异常玻璃常见的环/圆锥形裂纹。具有这种中间行为的玻璃需要很高的载荷才能启动源自地下的裂纹系统，即中位/径向和横向裂纹。结果表明，玻璃的变形和破裂响应取决于玻璃结构和接触几何形状。随着接触变得越来越尖锐，对于所有类型的玻璃，变形机制都将向塑性变形（即剪切）转变。另一方面，钝头接触促进更大的致密化。通过用一系列100°，110°，120°，136°（维氏），150°，160°角的一系列四棱锥压头压头显示每种玻璃从正常变形到异常变形和开裂行为的过渡°和170°。

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