Strength of Thin Chemtempered LensesStatic Load Testing
作者:
W.,
DUCKWORTH A.,
ROSENFIELD S.,
GULATI R.,
RIEGER K.,
期刊:
American Journal of Optometry and Physiological Optics
(OVID Available online 1979)
卷期:
Volume 56,
issue 1
页码: 39-47
ISSN:0093-7002
年代: 1979
出版商: OVID
关键词: ophthalmic lenses;lens strength;static load tests;tempered lenses;lens thickness
数据来源: OVID
摘要:
Static load tests were conducted on heat-tempered and chemtempered piano white crown glass lenses from five different optical laboratories. With both ball-on-ring and ring-on-ring loading, chemtempered lenses considerably thinner than 2.0 mm were found to be as failure resistant as 2.0-mm-thick heat-tempered lenses. A similar result was obtaind previously using the drop-ball test. It is shown that the theory of brittle fracture can be used to relate the results of different tests and provides a rational basis for comparing the relative performance of chemtempered and heat-tempered lenses.
点击下载:
PDF
(453KB)
返 回