Duckworth W H, Rosenfield A R, Gulati S T, Rieger R A, Hoekstra K E
Am J Optom Physiol Opt. 1979 Jan;56(1):39-47. doi: 10.1097/00006324-197901000-00007.
Static load tests were conducted on heat-tempered and chemtempered plano 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 obtained 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.
对来自五个不同光学实验室的热回火和化学回火平面白冕玻璃镜片进行了静载测试。采用球压环和环压环加载方式时，发现厚度明显小于2.0毫米的化学回火镜片与2.0毫米厚的热回火镜片具有相同的抗破坏能力。先前使用落球试验也得到了类似结果。结果表明，脆性断裂理论可用于关联不同测试的结果，并为比较化学回火镜片和热回火镜片的相对性能提供合理依据。
