Abstract
The effect of ex-situ method on the mechanical properties and toughness of the RTMable carbon fiber (G827)/polyimide(PI-9731) composites was studied. The results show that the interlaminar shear strength of G827/PI-9731 composites toughened by the ex-situ methods with powder and film increases from 97.9 MPa to 108 MPa and 110 MPa, respectively, when the thermoplastic PI mass fraction is 15% at room temperature. However, the interlaminar shear strength changes slightly at high temperature (288°C). The mode I fracture toughness of G827/PI-9731 composites toughened with powder method is improved from 310 J/m2 to 410 J/m2. The Mode II fracture toughness is improved from 590 J/m2 to 939 J/m2. However the mode I fracture toughness of G827/PI-9731 composites toughened with film method increases to 459 J/m2. The mode II fracture toughness is improved to 1100 J/m2. By SEM analysis, it is found that the toughness improvement results from the introduction of thermoplastic PI and the formation of the TP/TS phase inversion structure in the interlaminar regions, in which the PI-9731 particles wrapped by thermoplastic PI will be orientated and deformed in the process of crack extension.
| Original language | English |
|---|---|
| Pages (from-to) | 1-8 |
| Number of pages | 8 |
| Journal | Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica |
| Volume | 27 |
| Issue number | 6 |
| Publication status | Published - Dec 2010 |
| Externally published | Yes |
Keywords
- Composites
- Ex-situ toughening
- Mechanical properties
- Polyimides
- RTM
ASJC Scopus subject areas
- Ceramics and Composites
- General Chemistry
- Condensed Matter Physics
- Mechanics of Materials