Strength of glass from Hertzian line contact

Wenrui Cai, Brian Cuerden, Robert E. Parks, James H. Burge

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations


In optical lens assembly, metal retaining rings are often used to hold the lens in place. If we mount a lens to a sharp metal edge using normal retention force, high compressive stress is loaded to the interface and the calculated tensile stress near the contact area from Hertzian contact appears higher than allowable. Therefore, conservative designs are used to ensure that glass will not fracture during assembly and operation. We demonstrate glass survival with very high levels of stress. This paper analyzes the high contact stress between glass lenses and metal mounts using finite element model and to predict its effect on the glass strength with experimental data. We show that even though contact damage may occur under high surface tensile stress, the stress region is shallow compared to the existing flaw depth. So that glass strength will not be degraded and the component can survive subsequent applied stresses.

Original languageEnglish (US)
Title of host publicationOptomechanics 2011
Subtitle of host publicationInnovations and Solutions
StatePublished - 2011
EventOptomechanics 2011: Innovations and Solutions - San Diego, CA, United States
Duration: Aug 22 2011Aug 25 2011

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherOptomechanics 2011: Innovations and Solutions
Country/TerritoryUnited States
CitySan Diego, CA


  • Glass lenses
  • Hertzian contact
  • Strength of glass
  • Tensile stress

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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