Abstract: Aiming at the problem of cross section deformation and delamination of high-modulus carbon fiber composite tubes in alternating high and low temperature cycle environment, a single layer ultra-thin (0.02 mm) alkali-free glass fiber plain cloth is added between its large angle differential layers based on the idea of fiber hybrid. Simulation analysis shows that the glass fiber plain cloth effectively alleviates the thermal expansion mismatch between the large angle differential carbon fiber layers and reduces the inter-layer stress. The correctness of simulation analysis is confirmed by a test of 6 alternating temperature cycles of liquid nitrogen temperature (-196 ℃)~+150 ℃. After the test, the hybrid tube maintains itself intact layer and unchanged dimensional cross section size. Further bending performance comparison test of unidirectional plates shows that the addition of ultra-thin glass plain cloth enhances interlayer toughness of the tube, while has no significant effect on its bending performance, because of its low modulus and little thickness proportion (1.6%).

Key words: high-modulus carbon fiber composite, alternating high and low temperature cycle environment, structural stability, interlayer toughening