Premium
Theoretical and quantitative evaluation of the cuttability of AMLCD glass substrates using a four‐point‐bending test
Author(s) -
Ono Toshihiko,
Tanaka Koichi
Publication year - 1999
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.1984477
Subject(s) - bending , materials science , residual stress , composite material , point (geometry) , three point flexural test , stress (linguistics) , breaking strength , relaxation (psychology) , structural engineering , stress relaxation , geometry , engineering , mathematics , psychology , social psychology , linguistics , philosophy , creep
— Glass cutting is one of the important processes in liquid‐crystal display (LCD) manufacturing. Glass cutting consists of two processes, scribing and breaking. However, both processes have evolved through manufacturing experience and have not been analyzed theoretically. In particularly, no studies have been found which relate to the breaking process. In this study, theoretical and quantitative analysis is performed for the breaking process using a four‐point‐bending test of scribed sheet. From the results of the four‐point‐bending test, the breaking load of a scribed sheet was 40% lower than that of the theoretically calculated load due to the residual stress created by indentation and by sheet forming. For median crack depths greater than 100 μm, the breaking load increased to close to the calculated load due to stress relaxation by lateral crack growth. The four‐point‐bending lest of scribed glass sheet is effective in identifying the breaking process, and is necessary to understand glass “cuttability”.