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Analysis of Large Deformation Characteristics and Formability of PMMA

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Abstract:

Polymethylmetharylate (PMMA) has been widely used for aircraft canopies and transparent structural components, and processed into various parts through vacuum forming. In this study, the effects of forming speed and deformation characteristics on thickness uniformity during high-temperature vacuum forming of PMMA were analyzed. First, creep tests and high-temperature tensile tests were conducted at the specimen level to quantitatively distinguish between creep deformation and plastic deformation. Creep tests were performed under constant temperature and load conditions, and strain was measured through Digital Image Correlation. For plastic deformation analysis, tensile tests at room temperature and elevated temperatures were carried out to compare yield strength and elongation changes. To analyze thickness uniformity during the forming process, rectangular-shaped parts were fabricated using vacuum forming under various conditions where temperature and forming speed are key variables. After forming, thickness uniformity and surface transparency of the products were measured. Additionally, internal structural changes according to forming speed and temperature conditions were analyzed, and a comprehensive evaluation of material stability was performed.

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Periodical:

Defect and Diffusion Forum (Volume 451)

Pages:

103-110

DOI:

https://doi.org/10.4028/p-I4xQB3

Citation:

Cite this paper

Online since:

April 2026

Authors:

Min Jae Baek*, Yong Nam Kwon, Daeho Jeong, Ducksung Kim, Yoo In Jeong, Hyunsung Choi

Keywords:

Creep, High-Temperature, Plastic Deformation, Polymethyl Methacrylate (PMMA), Tensile, Vacuum Forming

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Creative Commons CC BY 4.0

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* - Corresponding Author

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