The longitudinal tensile

transverse tensile and in-plane shear mechanical properties of T300/QY8911-Ⅳ composites were initially investigated at different temperatures (room temperature

160

200

260℃).The variation rules of modulus and strength as the function of temperature were then discussed

and the corresponding mechanical models were proposed.The test results showed that the longitudinal modulus and strength were less affected by temperature at the range of 200℃. The maximum amplitude was only 2.82% and 1.41%

compared with the average value (room temperature). Due to the resin matrix deterioration

the longitudinal tensile performance was decreased by 5.85% and 7.01% (260℃)

respectively. The properties of transverse tensile and in-plane shear were significantly affected by temperature. The modulus of transverse and in-plane shear were reduced by 49.21%

70.34% and the corresponding strengths declined by 38.49%

44.85% (160℃) with respect to the average modulus (room temperature). The modulus properties mentioned above continued to decline by 25.13%

38.30% (200℃) and the strength dropped by another 0.41%

15.95%

respectively. The fitting results manifest that the three mechanical models are suitable to fit the data obtained by different temperatures and loads

while the model Ⅱ and Ⅲ are more accurate.