Thermoelasticity of injection-molded parts

Turk, Janez (author), Svenšek, Daniel (author)

In the realm of injection-molded parts, small length scale deformation defects such as sink marks often pose a major challenge to the aesthetics or functionality of the parts. To address this problem, we present a comprehensive thermoelastomechanical approach that calculates the deformation of injection molded plastic by solving the elastic problem at each time step. In our methodology, two treatments of the molten core are considered: one as a liquid and the other as a rubbery state. Our results suggest that the rubbery state treatment provides higher accuracy in predicting the deformation results, as it maintains the displacement of the localized thermal shrinkage in its vicinity. The validity of our method is supported by empirical measurements on produced parts from the existing literature as well as on samples that we molded independently.

• Language: English
• Keywords: thermoelasticity, injection molding, plastic, deformations, sink mark, volumetric shrinkage, injection molding defect
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 22 str.
• Numbering: Vol. 15, iss. 13, art. 2841
• PID: 20.500.12556/RUL-155548
• UDC: 621.767
• ISSN on article: 2073-4360
• DOI: 10.3390/polym15132841
• COBISS.SI-ID: 157351939
• Publication date in RUL: 05.04.2024

TURK, Janez and SVENŠEK, Daniel, 2023, Thermoelasticity of injection-molded parts. Polymers [online]. 2023. Vol. 15, no. 13,  2841. [Accessed 11 April 2025]. DOI 10.3390/polym15132841. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=155548

Record is a part of a journal

• Title: Polymers
• Shortened title: Polymers
• Publisher: MDPI
• ISSN: 2073-4360
• COBISS.SI-ID: 517951257

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: termoelastičnost, injekcijsko brizganje, plastika, deformacije