October 2021
Spotlight Summary by Cheng Jiang and Tim Grunwald
Analysis of lens fracture in precision glass molding with the finite element method
Finite element analysis is an excellent way to overcome trial-and-error methods in the layout of glass molding processes. Precision glass molding (PGM) technology has recently arisen as a promising fabrication way for the mass production of precision optical elements with complex shapes. However, glass fractures can occur during an improper PGM process. The authors of this spotlighted paper address these fracture phenomena by means of the finite element method (FEM), which is becoming more important in the process development chain since more information such as stress and temperature distribution in the glass can only be provided through FEM calculation while physical sensors cannot.
The authors propose a procedure on how to estimate the necessary material properties from an unfamiliar glass to start simulation immediately to avoid the glass fracture in PGM processes, if only another glass type with similar properties can be found and is well characterized. In particular, not every relevant glass property is published in the data sheet and the glass characterization consumes much time and costs, which will challenge the production planning. Therefore, the PGM process parameters can be simulated and further optimized rapidly in the digital world and applied in the real production with possible subsequent minor adjustments due to the errors from material properties estimation and the FEM simulation model itself.
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The authors propose a procedure on how to estimate the necessary material properties from an unfamiliar glass to start simulation immediately to avoid the glass fracture in PGM processes, if only another glass type with similar properties can be found and is well characterized. In particular, not every relevant glass property is published in the data sheet and the glass characterization consumes much time and costs, which will challenge the production planning. Therefore, the PGM process parameters can be simulated and further optimized rapidly in the digital world and applied in the real production with possible subsequent minor adjustments due to the errors from material properties estimation and the FEM simulation model itself.
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Article Information
Analysis of lens fracture in precision glass molding with the finite element method
Yue Liu, Yintian Xing, Chuang Li, Chao Yang, and Changxi Xue
Appl. Opt. 60(26) 8022-8030 (2021) View: Abstract | HTML | PDF