Numerical and Experimental Investigations of Polymer Viscoelastic Materials Obtained by 3D Printing
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Analysis
2.2. Numerical Method
2.2.1. Governing Equations
2.2.2. Constitutive Relations
2.2.3. Initial and Boundary Conditions
2.2.4. Correction of Boundary Conditions
2.2.5. Calculation of Total Stress
3. Results
3.1. Experimental Results
3.1.1. Determination of Creep Modulus from Creep Test
3.1.2. Determination of Creep Modulus from Constant Stress-Rate Test
3.1.3. Determination of Relaxation Modulus from the Constant Strain-Rate Test
3.1.4. Determination of Relaxation Module from Dynamic Test “Frequency Sweep”
3.1.5. Determination of Time-Temperature Coefficient aT
3.2. Examples of Numerical Simulations
3.2.1. Relaxation Test
3.2.2. Creep Recovery Test
3.2.3. Plane-Strain Time-Varying Test
3.2.4. Analysis of Viscoelastic Material with Simultaneous Mechanical and Thermal Loading
4. Discussion
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Acknowledgments
Conflicts of Interest
Nomenclature
a, b | coefficients in discretized equations |
aT | shift factor |
c | specific heat |
d | location vector |
e | internal energy |
E | Young’s relaxation modulus |
f | force |
G | shear relaxation modulus |
I | unit tensor |
i | Cartesian unit vector |
J | creep compliance |
K | volume relaxation modulus |
k | thermal conductivity |
P0, Pj | centers of control volumes |
q | heat flux vector |
Q, q | source terms |
r | distance vector |
n | vector of outer normal |
t | time |
t’ | reduced time |
T | temperature |
U | total displacement vector |
u | displacement vector |
V | volume |
α | thermal expansion coefficient |
Ґ | diffused term |
δt | time increment |
δT | temperature increment |
δε | strain increment |
λ, μ | Lame’s coefficients |
ρ | density |
σ | stress tensor |
τ | incremental time |
ν | Poisson’s number |
ω | angular velocity |
φ | generic variable |
γ | angular strain |
Subscripts | |
B | boundary |
i | Cartesian components |
j | cell index (volume) |
k | index in the Prony series |
r | radial direction |
x,y,z | Cartesian coordinates |
Superscripts | |
i | time-step counter |
j | iteration counter |
T | transpose |
Abbreviations | |
DMA | dynamic-mechanic analysis |
FDM | fused deposition modeling |
PLA | poly-lactic acid |
ABS | acrylonitrile butadiene styrene |
PE | polietilen |
CFS | closed-form shifting |
TTSP | time temperature |
superposition principle | |
FE | finite element method |
FVM | finite volume method |
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Number of Terms | Number of Terms | Number of Terms | Number of Terms | |||||
---|---|---|---|---|---|---|---|---|
1 | 3 | 5 | 7 | |||||
i | Ji | τi | Ji | τi | Ji | τi | Ji | τi |
0 | 3.3 × 10−9 | 3.2 × 10−9 | 3.1 × 10−9 | 2.9 × 10−9 | ||||
1 | 6.7 × 10−10 | 1.0 × 103 | 1.6 × 10−10 | 1.0 × 101 | 2.3 × 10−11 | 1.0 × 10−1 | 3.8 × 10−11 | 1.0 × 10−3 |
2 | 1.3 × 10−12 | 1.0 × 102 | 3.3 × 10−14 | 1.0 × 10−0 | 3.0 × 10−10 | 1.0 × 10−2 | ||
3 | 6.5 × 10−10 | 1.0 × 103 | 1.5 × 10−10 | 1.0 × 101 | 5.0 × 10−11 | 1.0 × 10−1 | ||
4 | 8.7 × 10−12 | 1.0 × 102 | 4.0 × 10−11 | 1.0 × 10−0 | ||||
5 | 6.4 × 10−10 | 1.0 × 103 | 1.3 × 10−11 | 1.0 × 101 | ||||
6 | 3.2 × 10−11 | 1.0 × 102 | ||||||
7 | 9.2 × 10−10 | 1.0 × 103 |
Number of Terms | Number of Terms | Number of Terms | Number of Terms | |
---|---|---|---|---|
1 | 3 | 5 | 7 | |
Average error (%) | 1.8 | 1.6 | 0.9 | 0.8 |
Number of Terms | Number of Terms | Number of Terms | Number of Terms | |||||
---|---|---|---|---|---|---|---|---|
1 | 2 | 5 | 10 | |||||
τi (s) | Ji | τi (s) | Ji | τi (s) | Ji | τi (s) | Ji | |
0 | 1.00 × 10+9 | 9.85 × 10+8 | 9.46 × 10+8 | 9.25× 10+8 | ||||
1 | 10.95 | 2.25 × 10+8 | 4.93 | 3.98 × 10−1 | 2.22 | 7.82 × 10+7 | 1.55 | 1.28 × 10+7 |
2 | 24.33 | 1.94 × 10+8 | 4.93 | 2.53 × 10−1 | 2.39 | 1.21 × 10+7 | ||
3 | 10.95 | 4.92 × 10−1 | 3.69 | 1.89 × 10+7 | ||||
4 | 24.33 | 1.96 × 10−1 | 5.70 | 2.57 × 10+7 | ||||
5 | 54.03 | 1.89 × 10+8 | 8.81 | 2.92 × 10+4 | ||||
6 | 13.62 | 4.90 × 10+6 | ||||||
7 | 21.04 | 1.20 × 10+7 | ||||||
8 | 32.52 | 2.00 × 10+6 | ||||||
9 | 50.25 | 1.44 × 10+6 | ||||||
10 | 77.65 | 1.82 × 10+8 |
Number of Terms | Number of Terms | Number of Terms | Number of Terms | |||||
---|---|---|---|---|---|---|---|---|
1 | 2 | 5 | 10 | |||||
τi (s) | Ei (Pa) | τi (s) | Ei (Pa) | τi (s) | Ei (Pa) | τi (s) | Ei (Pa) | |
0 | 1.00 × 10+9 | 9.85 × 10+8 | 9.46 × 10+8 | 9.25× 10+8 | ||||
1 | 10.95 | 2.25 × 10+8 | 4.93 | 3.98 × 10−1 | 2.22 | 7.82 × 10+7 | 1.55 | 1.28 × 10+7 |
2 | 24.33 | 1.94 × 10+8 | 4.93 | 2.53 × 10−1 | 2.39 | 1.21 × 10+7 | ||
3 | 10.95 | 4.92 × 10−1 | 3.69 | 1.89 × 10+7 | ||||
4 | 24.33 | 1.96 × 10−1 | 5.70 | 2.57 × 10+7 | ||||
5 | 54.03 | 1.89 × 10+8 | 8.81 | 2.92 × 10+4 | ||||
6 | 13.62 | 4.90 × 10+6 | ||||||
7 | 21.04 | 1.20 × 10+7 | ||||||
8 | 32.52 | 2.00 × 10+6 | ||||||
9 | 50.25 | 1.44 × 10+6 | ||||||
10 | 77.65 | 1.82 × 10+8 |
Coefficients of Prony Series | ||||||
---|---|---|---|---|---|---|
1 Term | 2 Terms | 3 Terms | ||||
i | Gi | τi | Gi | τi | Gi | τi |
0 | 5.6 × 10+8 | 5.6 × 10+8 | 5.7 × 10+8 | |||
1 | 1.5 × 10+7 | 1.0 × 10−1 | 1.1 × 10+7 | 3.3 × 10−1 | 1.5 × 10+9 | 2.4 × 10−5 |
2 | 1.0 × 10+7 | 3.1 × 10−2 | 1.5 × 10+7 | 6.4 × 10−2 | ||
3 | 5.7 × 10+5 | 3.2 × 10+2 |
Density ρ (kg/m3) | Heat Conductivity λt (W/m2K) | Linear Thermal Expansion α (K−1) |
---|---|---|
900 | 0.1 | 2.2× 10−4 |
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Ibrulj, J.; Dzaferovic, E.; Obucina, M.; Kuzman, M.K. Numerical and Experimental Investigations of Polymer Viscoelastic Materials Obtained by 3D Printing. Polymers 2021, 13, 3276. https://doi.org/10.3390/polym13193276
Ibrulj J, Dzaferovic E, Obucina M, Kuzman MK. Numerical and Experimental Investigations of Polymer Viscoelastic Materials Obtained by 3D Printing. Polymers. 2021; 13(19):3276. https://doi.org/10.3390/polym13193276
Chicago/Turabian StyleIbrulj, Jusuf, Ejub Dzaferovic, Murco Obucina, and Manja Kitek Kuzman. 2021. "Numerical and Experimental Investigations of Polymer Viscoelastic Materials Obtained by 3D Printing" Polymers 13, no. 19: 3276. https://doi.org/10.3390/polym13193276