J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (3): 383-393.DOI: 10.1016/j.jmst.2018.09.055
• Research Article • Previous Articles Next Articles
Jiajia Sun, Hejun Li*(), Liyuan Han, Qiang Song*()
Received:
2018-06-05
Revised:
2018-07-04
Accepted:
2018-07-25
Online:
2019-03-15
Published:
2019-01-18
Contact:
Li Hejun,Song Qiang
About author:
1 These authors contributed equally to this work.
Jiajia Sun, Hejun Li, Liyuan Han, Qiang Song. Enhancing both strength and toughness of carbon/carbon composites by heat-treated interface modification[J]. J. Mater. Sci. Technol., 2019, 35(3): 383-393.
d002(?) | Lc (?) | La (?) | g (%) | |
---|---|---|---|---|
As-deposited | 3.416?±?0.002 | 28.28?±?3.71 | 29.16?±?0.27 | 27.67?±?3.29 |
Heat-treated | 3.381?±?0.002 | 62.49?±?7.70 | 140.00?±?7.48 | 69.19?±?5.81 |
Table 1 Microcrystalline parameters of carbon interface.
d002(?) | Lc (?) | La (?) | g (%) | |
---|---|---|---|---|
As-deposited | 3.416?±?0.002 | 28.28?±?3.71 | 29.16?±?0.27 | 27.67?±?3.29 |
Heat-treated | 3.381?±?0.002 | 62.49?±?7.70 | 140.00?±?7.48 | 69.19?±?5.81 |
Fig. 9. Fracture mirror measurements of pull-out carbon fibers. Typical fractured surface observation of (a) pristine and (c) heat-treated carbon fiber and (b) Weibull plots probability of pull-out pristine carbon fibers.
Parameters | Values | Reference |
---|---|---|
λ | 1.34 | [ |
Гm | 10?J?m-2 | [ |
Ef | 280 GPa | [ |
Em | 27.1 GPa | [ |
Table 2 The value of referred parameters.
Parameters | Values | Reference |
---|---|---|
λ | 1.34 | [ |
Гm | 10?J?m-2 | [ |
Ef | 280 GPa | [ |
Em | 27.1 GPa | [ |
Fig. 12. Model cells and their mesh: example of FE cell models for the analysis of RTS in (a) P-C/C and (b) HI-C/C. Mesh used for FE calculation of RTS in micro-composites: (c) P-C/C; (d) HI-C/C.
Materials | Modulus: E (GPa) | Poisson ratio | CTE (°C) | ||
---|---|---|---|---|---|
Carbon fibers [ | x-direction | 15 | νxy | 0.25 | 5.7?×?10-6 |
y-direction | 15 | νxz | 0.15 | 5.7?×?10-6 | |
Axial (z) | 230 | νyz | 0.15 | 0.7?×?10-6 | |
As-deposited PyC [ | Radial (x) | 12.8 | νxy | 0.15 | 2.2?×?10-5 |
Tangential (y) | 27.1 | νxz | 0.15 | 5.5?×?10-6 | |
Axial (z) | 27.1 | νyz | 0.3 | 5.5?×?10-6 | |
Heat-treated PyC [ | Radial (x) | 16.7 | νxy | 0.15 | 2.5?×?10-5 |
Tangential (y) | 38.6 | νxz | 0.15 | 0 | |
Axial (z) | 38.6 | νyz | 0.3 | 0 | |
Heat-treated fibers [ | x-direction | 20 | νxy | 0.25 | 6.9?×?10-6 |
y-direction | 20 | νxz | 0.15 | 6.9?×?10-6 | |
Axial (z) | 280 | νyz | 0.15 | 0 |
Table 3 Parameters used in the calculation of FE analysis.
Materials | Modulus: E (GPa) | Poisson ratio | CTE (°C) | ||
---|---|---|---|---|---|
Carbon fibers [ | x-direction | 15 | νxy | 0.25 | 5.7?×?10-6 |
y-direction | 15 | νxz | 0.15 | 5.7?×?10-6 | |
Axial (z) | 230 | νyz | 0.15 | 0.7?×?10-6 | |
As-deposited PyC [ | Radial (x) | 12.8 | νxy | 0.15 | 2.2?×?10-5 |
Tangential (y) | 27.1 | νxz | 0.15 | 5.5?×?10-6 | |
Axial (z) | 27.1 | νyz | 0.3 | 5.5?×?10-6 | |
Heat-treated PyC [ | Radial (x) | 16.7 | νxy | 0.15 | 2.5?×?10-5 |
Tangential (y) | 38.6 | νxz | 0.15 | 0 | |
Axial (z) | 38.6 | νyz | 0.3 | 0 | |
Heat-treated fibers [ | x-direction | 20 | νxy | 0.25 | 6.9?×?10-6 |
y-direction | 20 | νxz | 0.15 | 6.9?×?10-6 | |
Axial (z) | 280 | νyz | 0.15 | 0 |
Fig. 13. Distribution of RTS in the P-C/C. Isometric view of (a) radial stress; (c) tangential stress and (e) axial stress. Cross-sectional view of (b) radial stress; (d) tangential stress and (f) axial stress.
Fig. 14. Distribution of RTS in the HI-C/C. Isometric view of (a) radial stress; (c) tangential stress and (e) axial stress. Cross-sectional view of (b) radial stress; (d) tangential stress and (f) axial stress.
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