Acta Materiae Compositae Sinica Vol123 No11 February 2006

Transcription

1 Acta Materiae Compositae Sinica Vol123 No11 February 2006 : (2006) /, 3,, (, ) : GABO EPL EXOR 500 N 648 DMA, 500 N, ;, : ; ; ; : TB332 : A Dynamic viscoelasticity of f iber reinf orced composites under different preload/ dynamic load GON G Yuanming, SUN Zhijie 3, H E Chenghong, ZHAN G Zuoguang ( School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing , China) Abstract : The EPL EXOR 500 N of Germany GABO company was used to determine the dynamic mechanical pro2 perties of carbon and glass fiber composites, which can offer a maximal load of 500 N compared to other DMA equipment. All experiments were carried out in the three2point bending mode, at 25 and 10 Hz. The effects of experiment parameters, such as preload, dynamic load, fiber type and modulus on dynamic viscoelasticities were investigated. The result s show that the storage modulus increases with the preload, but decreases with the dynamic load, and the fiber type has little influence on the viscoelastic behavior, but the modulus influences it obviously. Keywords : composites ; viscoelasticity ; preload ; dynamic load (DMA),, [1,2 ] DMA,,, [36 ] GABO EPL EXOR 500 N 500 N, 30 mm, 5 mm : ; : :,, E2mail : net : S22, ; T300B, : 648, :,

2 , : / ,,, 48 h, 1. 3,,, Etan EPL EXOR 500 N,, 2. 2, T300/ 648, : mm, 10 Hz, mm ( ) ; 132 N, ,, T300/ 648, mm mm (, ) ; 12 N, 1 1,, E, ; E tan 648, 10 Hz,,, [ 7 ],,,,,,, 2 2,, E ; E tan,,,, 2 Fig. 2 Influence of dynamic load on dynamic viscoelasticities 1 Fig. 1 Influence of preload on dynamic viscoelasticities 2. 3,, 3 3 (a) mm mm ( ), 10 N 3 (a),, 3 (a) 1,,

3 28 3 Fig. 3 Preload scan of glass fiber composite under different dynamic loads, ;,,,,, 3 (b) 14 N 3 (a) 3 (b),, ;,,,,, 4 tan 100 N 6, mm mm ( ) ; 4 Fig. 4 Dynamic load scan of glass fiber composite under preload of 208 N 208 N 4 2,, : 2. 4, 3, 3 / GPa, mm 3148 mm 9194 mm mm 9144 mm 2176 mm : 8012 GPa 18 N, 8516 GPa 19 N, GPa 12 N, 12 N 383 N, 5 : 8012 GPa 208 N, 8516 GPa 219 N, GPa 192 N, 7 5, 3 :, E, ; E tan,, 3 E 6,

4 , : / 29 5 Fig. 5 Preload scan of composites wit h different moduli 7 Fig. 7 Dynamic load scan of composites wit h different moduli 6 ig. 6 Influence of modulus on viscoelasticity in preload scan E 7, 3 E E :, E, E GPa GPa, tan,, GPa, tan 200 N, 8 8,, E, E tan, [8, 9 ] GPa GPa,,,,,, 8 Fig. 8 Influence of modulus on viscoelasticity in dynamic load scan tan GPa,,,,,, 3 (1), E, ; E tan (2), E ; E tan,, ; E Etan (3),

5 30, E tan ;, E tan (4) E ; E tan ;,, E tan : [ 1 ],,,. [ M ]. :, [ 2 ] Gill S P. Dynamic mechanical analysis assures composites qua2 lity [J ]. I ndust rial Research & Development, 1983, 25 (3) : [ 3 ] Alvarez V A, Valdez M E, Vazquez A. Dynamic mechanical properties and interphase fiber/ matrix evaluation of unidirec2 tional glass fiber/ epoxy composites [ J ]. Poly mer Testing, 2003, 22 : [ 4 ] Lee T H, Freddy Beoy Y C, Loh N L. Characterization of fiber2reinforced polymer composite by dynamic mechanical analysis : Effect of aspect ratio and static stress [J ]. Com po2 sites Science and Technology, 1993, 49 : [5 ] Lazan B J. Behavior of plastics under vibrations [J ]. Techni2 cal Section, 1942, 11 : [ 6 ],,,. / [J ]., 2001, 18 (1) : Hou X H, Li H J, Wang C, et al. Internal friction characters and mechanism in pyrolytic carbon matrix carbon2carbon composites [ J ]. A cta M ateriae Com positae Sinica, 2001, 18 (1) : [7 ],,. [ M ]. :, [ 8 ] Dong S, Gauvin R. Application of dynamical analysis for t he study of the interfacial region in carbon fiber/ epoxy composites materials [J ]. Pol y mer Com posites, 1993, 14 (5) : [9 ] Finegan I C, Gibson R F. Recent research on enhancement of damping in polymer composites [ J ]. Com posite S tructures, 1999, 44 :