Forming of Dynamic Microstructure of Flexible Polymer
Abstract
:1. Introduction
2. Construction and Analysis of the Theoretical Mechanism of Dynamic Tensile Deformation
2.1. Building and Evaluation of Mechanical Model of Viscoelastic Response of Mold Material
2.1.1. Maxwell Model and Kelvin–Voight Model Building
2.1.2. Constructing Model A and Model B
2.1.3. Asymmetric Imprint Molding Prediction Geometric Shape Construction
3. Experimental
3.1. Design and Development of the Gasbag-Assisted Dynamic Forming System with Microstructure Mold Preparation
3.2. Gasbag-Assisted Compressive Stress Distribution Simulation and Microstructure Change Analysis
3.3. Gasbag-Assisted Dynamic Microstructure Forming Uniformity Test and Molding Steps
4. Results and Discussion
4.1. Discussion of the Mechanical Simulation of Cross Mold Dynamic Control and Mechanical Model Building
4.1.1. Cross Mold Dynamic Control Simulation Analysis
4.1.2. Construction of Mold Mechanical Model
4.2. Curved Imprinting Simulation and Experimental Analysis
4.2.1. Effect of Curved Imprinting on Mold Microstructure
4.2.2. Effect of Curved Imprinting Under Unequal Curvature Radius on Mold Microstructure
4.2.3. Curved Imprinting Dynamic Regulation Microstructure Replication Forming Analysis
4.3. Asymmetric Imprint MATLAB Prediction Analysis and Bifacial Gasbag Dynamic Experiment Result
4.3.1. Asymmetric Imprint MATLAB Prediction Analysis and Experiment Accuracy
4.3.2. Experimental Performance of Bifacial Gasbag-Assisted Dynamic Tensile Forming
4.3.3. Forming Operation Window of Bifacial Gasbag-Assisted Dynamic Tensile Imprint Reproduction
5. Conclusions
Funding
Conflicts of Interest
References
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Mechanical Properties | Gasbag | PDMS | Imprinting Platform |
---|---|---|---|
Density (Ton/mm3) | 0.9 | 0.95 | 1.18 |
Young’s modulus (MPa) | 35 | 2.46 | 3240 |
Poisson ratio | 0.45 | 0.47 | 0.33 |
Proportion | Loading Rate (mm/min) | Tension Stress (MPa) | Modulus (MPa) | Poisson’s Ratio | Shear Strength (N/cm2) | |||
---|---|---|---|---|---|---|---|---|
A:B | ||||||||
8 | 0.213 | 3.13 | 0.58 | 332.45 | ||||
5:1 | 5 | 0.203 | 3.04 | 0.52 | 330.21 | |||
2 | 0.197 | 2.92 | 0.53 | 298.31 | ||||
8 | 0.163 | 2.37 | 0.52 | 175.27 | ||||
10:1 | 5 | 0.157 | 2.32 | 0.51 | 172.38 | |||
2 | 0.158 | 2.28 | 0.49 | 166.97 | ||||
8 | 0.103 | 1.78 | 0.47 | 56.23 | ||||
15:1 | 5 | 0.093 | 1.65 | 0.45 | 54.12 | |||
2 | 0.071 | 1.60 | 0.48 | 50.92 | ||||
Proportion | Loading rate (mm/min) | Strain rate (dε/dt) × 10−4 | Strain (×10−4) | Stress relaxation (dS/dt) × 10−4 | ||||
A:B | ||||||||
8 | 38.095 | 337.328 | 89.519 | |||||
5:1 | 5 | 23.809 | 333.881 | |||||
2 | 9.523 | 340.255 | ||||||
8 | 38.095 | 343.881 | 63.538 | |||||
10:1 | 5 | 23.809 | 338.362 | |||||
2 | 9.523 | 346.491 | ||||||
8 | 38.095 | 289.325 | 6.711 | |||||
15:1 | 5 | 23.809 | 281.818 | |||||
2 | 9.523 | 221.875 |
Proportion A:B | Model (η Value) | |||
---|---|---|---|---|
Maxwell | Kelvin–Voight | Model A | Model B | |
5:1 | 1265.363631 | −764.623189 | 2444.59607 | 1898.045447 |
10:1 | 1581.055442 | −612.2271563 | 3284.394812 | 2371.583163 |
15:1 | 462.0473758 | −59.29427477 | 1056.217947 | 693.0710637 |
Elongation Distance (mm) | Short Diameter (μm) | Long Diameter (μm) | Microstructures Height (μm) | Adjacent Height (μm) | Height Difference (μm) |
---|---|---|---|---|---|
0 | 230 | 230 | 67.75 | 70.12 | 2.36 |
2 | 228 | 243 | 64.63 | 68.19 | 3.55 |
4 | 228 | 252 | 63.27 | 67.25 | 3.97 |
6 | 225 | 255 | 61.15 | 65.16 | 4.01 |
8 | 225 | 257 | 58.04 | 63.13 | 5.09 |
10 | 223 | 262 | 56.89 | 62.80 | 5.90 |
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Weng, Y.-J. Forming of Dynamic Microstructure of Flexible Polymer. Materials 2019, 12, 3332. https://doi.org/10.3390/ma12203332
Weng Y-J. Forming of Dynamic Microstructure of Flexible Polymer. Materials. 2019; 12(20):3332. https://doi.org/10.3390/ma12203332
Chicago/Turabian StyleWeng, Yung-Jin. 2019. "Forming of Dynamic Microstructure of Flexible Polymer" Materials 12, no. 20: 3332. https://doi.org/10.3390/ma12203332