| Document ID (ISN) | 18717 |
| CIS number |
73-1080 |
| ISSN - Serial title |
Investigate Ophthalmology |
| Year |
1971 |
| Convention or series no. |
|
| Author(s) |
Wigglesworth E.C. |
| Title |
The effect of thermal toughening on the impact resistance of simulated safety lenses |
| Bibliographic information |
Dec. 1971, Vol.10, No.12, p.992-999. Illus. 13 ref. |
| Abstract |
Flat glass specimens, simulating eye-protector lenses, were generated in 7 thicknesses between 1.3 and 4mm. Half the specimens, randomly selected, were heat treated and all were then dynamically tested to destruction. The results show that the effect of the heat treatment was to increase the impact resistance measured in terms of fracture velocity. For all thicknesses, the approximate relationship was found to be V2/V1 = @1t2@1z, where V2 is the fracture velocity of the untoughened specimens and V1 is the fracture velocity of the toughened specimens. The relationship was found to hold for a group of +1.75 diopter spherical meniscus lenses of centre thickness 2mm and edge thickness 1mm and of base curve 6 diopter, similarly treated. The relationship was independent of missile diameter in drop-tower tests (simulating blunt trauma production with large missiles) and in ballistic experiments (simulating penetrating-injury production from small missiles). |
| Descriptors (primary) |
impact strength; filter glasses; heat treatment; safety glass |
| Descriptors (secondary) |
glass; simulation facilities; comparative study; impact testing; destructive testing; materials testing |
| Document type |
D - Periodical articles |
| Subject(s) |
Personal protection
|
| Broad subject area(s) |
Mechanical hazards, transport
|
| Browse category(ies) |
Face and eye protection
|
