Tuesday, 28 June 2011

Fused Glass Creations

Fused Glass Creations Glass can break in a controlled manner (e.g., along its score line) because it doesn’t have a specific molecular structure. For example, a diamond breaks cleanly along its fixed molecular structure or cleavage (more commonly understood as “grain”). If you don’t properly align your breaking tool along the grain, the diamond can shatter. However, because glass doesn’t have a grain, you can break it in any direction without it shattering. The question is how do we get it to break the way we want?
Fused Glass Creations Depending on the tools used, glass can either break from exceeding its tensile strength or cut from exceeding its compressive or shear strength. To control the fracture, we must define where to exceed the tensile, compressive, or shear strength to result in a controlled fracture. We do this by scoring the glass when we want to break it by applying a tensile stress or properly aligning the cutters when we want to cut it by applying a compressive or shear stress. For example, the glass’ tensile strength along a tiny score line is less than anywhere else on the glass, so it tends to break cleanly along that line (i.e., the break follows the path of least resistance).
When a separation occurs because of tensile stress, the separation is called a “break.” When a separation occurs because of shear stress or compressive stress, the separation is called a “cut.

Fused Glass Creations When using a scoring tool and running pliers on stained glass, you apply tensile stress to break the glass. When using wheeled cutters with the two wheels aligned (or other tool with the cutting edges aligned, such as nippers), you apply compressive stress to Fused Glass Creations cut the glass. When using wheeled cutters with the two wheels misaligned (e.g., because you dropped the tool and bent the jaws out of alignment), you apply shear stress to cut the glass. (The most familiar example of a cutting tool with misaligned cutting edges is a pair of scissors where the two cutting edges are side by side instead of aligned.)

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