Simultaneous non-contact identification of the elastic modulus, damping and coefficient of thermal expansion in 3D-printed structures

Krivic, Gašper (author), Slavič, Janko (author)

Thermoplastic-extrusion 3D printing has gained popularity for the fabrication of electrothermal soft actuators that can control shape in response to temperature changes generated by embedded 3D-printed heaters. However, the material properties, such as the coefficient of thermal expansion, elastic modulus, and damping, significantly impact the performance of these 3D-printed electrothermal actuators. The material properties can be temperature-dependent, and vary based on the print and fill orientation. Current experimental methods cannot simultaneously research these properties, resulting in partial research of the influencing parameters. This research introduces a simultaneous and non-contact identification method for the elastic modulus, damping, and coefficient of thermal expansion, utilizing optical and thermal cameras, a scanning laser vibrometer, IR heating, and electrodynamic shaker excitation. The method was applied to several materials, including composites. The introduced method can fully characterize the 3D prints and the materials used for 3D printing, leading to the faster and more predictable development of future 3D-printed electrothermal actuators.

• Language: English
• Keywords: elastic modulus, coefficient of thermal expansion, damping ratio, glass-transition temperature, 3D printing, electrothermal actuators
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 14 str.
• Numbering: Vol. 125, art. 108131
• PID: 20.500.12556/RUL-152118-88ea76ea-40d6-2a2d-6b80-f6d5b882955f
• UDC: 539.3
• ISSN on article: 0142-9418
• DOI: 10.1016/j.polymertesting.2023.108131
• COBISS.SI-ID: 170982915
• Publication date in RUL: 06.11.2023

Record is a part of a journal

• Title: Polymer testing
• Shortened title: Polym. test.
• Publisher: Elsevier
• ISSN: 0142-9418
• COBISS.SI-ID: 26155008

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

Abstract

3D-tisk z ekstruzijo termoplastov je postal priljubljen za izdelavo elektrotermičnih mehkih aktuatorjev. Te lahko spreminjajo obliko kot odziv na temperaturne spremembe generirane z vgrajenim 3D-tiskanim grelcem. Lastnosti materiala, kot so temperaturni razteznostni koeficient, modul elastičnosti in dušenje, bistveno vplivajo na delovanje 3D-tiskanih elektrotermičnih aktuatorjev. Te so lahko odvisne od temperature in se spreminjajo glede na usmerjenost tiska in polnila. S trenutnimi eksperimentalnimi metodami ni mogoče hkrati raziskati teh materialnih lastnosti, zaradi česar so vplivni parametri le delno raziskani. Ta raziskava uvaja sočasno in brezkontaktno metodo identifikacije modula elastičnosti, dušenja in temperaturnega razteznostnega koeficienta z uporabo optičnih in toplotnih kamer, skenirnega laserskega vibrometra, IR-segrevanja in elektrodinamičnega stresalnika. Metoda je bila uporabljena na več materialih za 3D-tisk, vključno s kompoziti. Predstavljena metoda lahko v celoti ovrednoti 3D-tiskane strukture in materiale za 3D-tisk, kar vodi k hitrejšemu razvoju 3D-tiskanih elektrotermičnih aktuatorjev.

• Keywords: modul elastičnosti, temperaturni razteznostni koeficient, razmernik dušenja, temperatura steklastega prehoda, 3D-tisk, elektrotermični aktuatorji

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0263
• Name: Mehanika v tehniki

• Funder: ARRS - Slovenian Research Agency
• Project number: J2-3045
• Name: V enem procesu 3D natisnjeni dinamični senzorji