|
|
Thermally tempered
stress distribution
Compressive
surface stresses can be induced in the upper thickness of the glass
cantilever by quenching the the surface with a jet of cool air or
water, once the mass of the glass casting has reached a temperature
above the the glass transition region and below the softening point.
This causes the surface region to become rigid first. As cooling
continues, the plastic interior mass contracts, pulling the rigid
surface into compression.
Back
| Home | Next |
|
|