Abstract:
The mechanical properties of resin casting body and carbon fiber reinforced resin composite laminate were investigated under various temperatures experimentally. Influence of temperature on the stress-strain curve was discussed and then fracture surface analysis was also conducted. The experiment results showed that the tensile and compression properties of the resin casting body were obviously affected by temperature, and both of the properties were unequal. The average tensile modulus and strength fell by 31.73% and 44.71% compared with the value at room temperature (RT 20℃), and then dropped by 21.15% and 20.37%, respectively if continuing to heat up to 200℃. The average compressive modulus and strength at 160℃ decreased by 26.67% and 44.40% in comparison with those at RT, and the relative values continued to decline by 6.66% and 12.40%. For the composites, the longitudinal tensile property was hardly affected by temperature. The maximum amplitudes in the average stiffness and strength were only 2.82% and 2.53%. The longitudinal fractured surface morphology illustrated a "brushy" shape at RT, while a split configuration was observed at elevated temperature. The mechanical properties of transverse and in-plane shear were significantly affected by temperature and the stress-strain curve showed an obvious nonlinearity, however, a neat fractured surface subjecting to transverse loading and shear fractured surface had no significant necking appearance, which indicated brittle-natured fracture. The modulus of transverse and in-plane shear was reduced by 32.96%, 41.25% and the related strength declined by 15.83%, 30.96% at 160℃ compared with those at RT. When the temperature reached 200℃, the modulus continued to decline by 16.83%, 22.52%, and the corresponding strength dropped by 12.24% and 11.01%, respectively.
