| Naslov: | Thermo-mechanical behavior and strain rate sensitivity of 3D-printed polylactic acid (PLA) below glass transition temperature (Tg) |
|---|
| Avtorji: | ID Slavković, Vukašin (Avtor)
ID Hanželič, Blaž (Avtor)
ID Plesec, Vasja (Avtor)
ID Milenković, Strahinja (Avtor)
ID Harih, Gregor (Avtor) |
|---|
| Datoteke: |  polymers-16-01526.pdf (5,88 MB)
MD5: 8DEBB5499C58F7B231378AF90FACD7C7
 https://www.mdpi.com/2073-4360/16/11/1526
|
|---|
| Jezik: | Angleški jezik |
|---|
| Vrsta gradiva: | Članek v reviji |
|---|
| Tipologija: | 1.01 - Izvirni znanstveni članek |
|---|
| Organizacija: | FS - Fakulteta za strojništvo
|
|---|
| Opis: | This study investigated the thermomechanical behavior of 4D-printed polylactic acid (PLA), focusing on its response to varying temperatures and strain rates in a wide range below the glass transition temperature (Tg). The material was characterized using tension, compression, and dynamic mechanical thermal analysis (DMTA), confirming PLA’s strong dependency on strain rate and temperature. The glass transition temperature of 4D-printed PLA was determined to be 65 °C using a thermal analysis (DMTA). The elastic modulus changed from 1045.7 MPa in the glassy phase to 1.2 MPa in the rubber phase, showing the great shape memory potential of 4D-printed PLA. The filament tension tests revealed that the material’s yield stress strongly depended on the strain rate at room temperature, with values ranging from 56 MPa to 43 MPA as the strain rate decreased. Using a commercial FDM Ultimaker printer, cylindrical compression samples were 3D-printed and then characterized under thermo-mechanical conditions. Thermo-mechanical compression tests were conducted at strain rates ranging from 0.0001 s−1 to 0.1 s−1 and at temperatures below the glass transition temperature (Tg) at 25, 37, and 50 °C. The conducted experimental tests showed that the material had distinct yield stress, strain softening, and strain hardening at very large deformations. Clear strain rate dependence was observed, particularly at quasi-static rates, with the temperature and strain rate significantly influencing PLA’s mechanical properties, including yield stress. Yield stress values varied from 110 MPa at room temperature with a strain rate of 0.1 s−1 to 42 MPa at 50 °C with a strain rate of 0.0001 s−1. This study also included thermo-mechanical adiabatic tests, which revealed that higher strain rates of 0.01 s−1 and 0.1 s−1 led to self-heating due to non-dissipated generated heat. This internal heating caused additional softening at higher strain rates and lower stress values. Thermal imaging revealed temperature increases of 15 °C and 18 °C for strain rates of 0.01 s−1 and 0.1 s−1, respectively. |
|---|
| Ključne besede: | smart materials, shape memory polymer, 3D printing, 4D printing, thermo-mechanical experiments |
|---|
| Status publikacije: | Objavljeno |
|---|
| Verzija publikacije: | Objavljena publikacija |
|---|
| Poslano v recenzijo: | 17.04.2024 |
|---|
| Datum sprejetja članka: | 24.05.2024 |
|---|
| Datum objave: | 29.05.2024 |
|---|
| Založnik: | MDPI |
|---|
| Leto izida: | 2024 |
|---|
| Št. strani: | 17 str. |
|---|
| Številčenje: | Vol. 16, iss. 11, [article no.] 1526 |
|---|
| PID: | 20.500.12556/DKUM-88837  |
|---|
| UDK: | 536:620.1 |
|---|
| COBISS.SI-ID: | 197165059 |
|---|
| DOI: | 10.3390/polym16111526 |
|---|
| ISSN pri članku: | 2073-4360 |
|---|
| Avtorske pravice: | © 2024 by the authors |
|---|
| Datum objave v DKUM: | 29.05.2024 |
|---|
| Število ogledov: | 560 |
|---|
| Število prenosov: | 54 |
|---|
| Metapodatki: |    |
|---|
| Področja: | Ostalo
|
|---|
|
:
|
Kopiraj citat |
|---|
| | | | Skupna ocena: | (0 glasov) |
|---|
| Vaša ocena: | Ocenjevanje je dovoljeno samo prijavljenim uporabnikom. |
|---|
| Objavi na: |  |
|---|
Postavite miškin kazalec na naslov za izpis povzetka. Klik na naslov izpiše
podrobnosti ali sproži prenos. |
