Effects of Matrix Properties on the Interfacial Shear Strength Between Carbon Fiber and Various Thermoplastic Polymers, and Their Influence on the Mechanical Properties of Composites
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Microdroplet Test
2.3. Evaluation of Matrix Properties
2.3.1. Tensile Test
2.3.2. Thermal Analysis
2.3.3. Measurement of Matrix Density
2.3.4. FEM Analysis of Matrix Tightening Stress
2.4. Molding of CFRTP Laminates
2.5. Evaluation of the Mechanical Properties of CFRTP Laminates
3. Results and Discussion of Interfacial Shear Strength
3.1. Microdroplet Test
3.2. Evaluation of Matrix Properties
3.3. Relationship Between Fiber–Matrix Interfacial Shear Strength and Matrix Properties
3.3.1. Relationship Between Fiber–Matrix Interfacial Shear Strength and Matrix Tightening Stress
3.3.2. Relationship Between Fiber–Matrix Interfacial Shear Strength and Tensile Strength of Matrix
3.3.3. Relationship Between Fiber–Matrix Interfacial Shear Strength and Matrix Modulus
3.3.4. Relationship Between Fiber–Matrix Interfacial Shear Strength and Melting Temperature of Matrix
3.3.5. Relationship Between Fiber–Matrix Interfacial Shear Strength and Coefficient of Linear Expansion of Matrix
3.3.6. Relationship Between Fiber–Matrix Interfacial Shear Strength and Matrix Density
4. Results and Discussion of Mechanical Properties of CFRTP
4.1. Short-Beam Three-Point Bending Test
4.2. Three-Point Bending Test
4.3. Relationship Between Mechanical Properties of CFRTP Laminates and Fiber–Matrix Interfacial Strength
5. Conclusions
- Fiber–matrix interfacial shear strength exhibited a positive correlation with matrix tightening stress, which constricts the fiber in the radial direction, as well as with matrix density, tensile strength, modulus, and melting temperature of each matrix. In contrast, it showed a negative correlation with the coefficient of linear expansion of the matrices.
- Higher fiber–matrix interfacial shear strength can be achieved by using a matrix with a higher density, even without direct evaluation of fiber–matrix interfacial strength, as fiber–matrix interfacial shear strength showed a strong positive correlation with matrix density.
- The mechanical properties of CFRTP laminates were enhanced when matrices with higher fiber–matrix interfacial shear strength were used.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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PA6 | PA66 | PA12 | PP | |
---|---|---|---|---|
Environment | Under atmospheric conditions | |||
Heating rate | 10 °C/min | |||
Initial load | 50 gf (490 mN) | |||
Temperature range | 30 °C to 190 °C | 30 °C to 230 °C | 30 °C to 150 °C | 30 °C to 130 °C |
Dimensional change from 180 °C to 190 °C | Dimensional change from 220 °C to 230 °C | Dimensional change from 140 °C to 150 °C | Dimensional change from 120 °C to 130 °C | |
Dimension at 180 °C | Dimension at 220 °C | Dimension at 140 °C | Dimension at 120 °C | |
10 °C |
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Tanaka, K.; Sakakibara, R. Effects of Matrix Properties on the Interfacial Shear Strength Between Carbon Fiber and Various Thermoplastic Polymers, and Their Influence on the Mechanical Properties of Composites. J. Compos. Sci. 2025, 9, 174. https://doi.org/10.3390/jcs9040174
Tanaka K, Sakakibara R. Effects of Matrix Properties on the Interfacial Shear Strength Between Carbon Fiber and Various Thermoplastic Polymers, and Their Influence on the Mechanical Properties of Composites. Journal of Composites Science. 2025; 9(4):174. https://doi.org/10.3390/jcs9040174
Chicago/Turabian StyleTanaka, Kazuto, and Ryota Sakakibara. 2025. "Effects of Matrix Properties on the Interfacial Shear Strength Between Carbon Fiber and Various Thermoplastic Polymers, and Their Influence on the Mechanical Properties of Composites" Journal of Composites Science 9, no. 4: 174. https://doi.org/10.3390/jcs9040174
APA StyleTanaka, K., & Sakakibara, R. (2025). Effects of Matrix Properties on the Interfacial Shear Strength Between Carbon Fiber and Various Thermoplastic Polymers, and Their Influence on the Mechanical Properties of Composites. Journal of Composites Science, 9(4), 174. https://doi.org/10.3390/jcs9040174