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Mechanical Reliability Prediction of Foldable Displays Using Subcritical Crack Growth in Siloxane-Based Cover Window by Two-Point Bending Test

Authors
Kim, Min-guKim, Young-minHan, Seog-young
Issue Date
Nov-2022
Publisher
KOREAN SOC PRECISION ENG
Keywords
Composite materials; Fatigue; Finite element method; Foldable displays; Siloxane coating; Two-point bending test; Weibull distribution
Citation
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING, v.23, no.11, pp.1301 - 1313
Indexed
SCIE
SCOPUS
KCI
Journal Title
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
Volume
23
Number
11
Start Page
1301
End Page
1313
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/185382
DOI
10.1007/s12541-022-00702-6
ISSN
2234-7593
Abstract
Various novel materials have been researched to improve the performance of foldable displays. The foldable display includes thin-film multilayers and the cover window for anti-scratch is located at the top, making it the most vulnerable to breakage. Siloxane hybrid polymer is considered the most promising material for anti-scratch ability and flexibility. However, information for calculating the long-term reliability of such materials is seriously lacking. This paper suggests a method to predict the mechanical reliability of a foldable display based on the principles of fracture mechanics and statistics. Mechanical properties of siloxane coating were determined using two-point bending test that is non-contact test method suitable for mechanical test of thin films. The elastic moduli and Weibull characteristic strength of the polymer were obtained from the two-point bending test. Stress corrosion susceptibility parameter by subcritical crack growth was determined by measuring the fracture strain at various faceplate velocity conditions. Using Weibull characteristic strength and stress corrosion susceptibility parameter, the long-term reliability of the foldable display was predicted under various curvatures. The suggested method can be used to evaluate the long-term reliability of foldable displays more accurately.
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서울 공과대학 > 서울 기계공학부 > 1. Journal Articles
서울 기술경영전문대학원 > 서울 기술경영학과 > 1. Journal Articles

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Kim, Young min
GRADUATE SCHOOL OF TECHNOLOGY & INNOVATION MANAGEMENT (DEPARTMENT OF TECHNOLOGY MANAGEMENT)
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