以环氧树脂浇注体、单向碳纤维/环氧树脂复合材料（UD）为对照，研究三维编织、机织碳纤维/环氧树脂复合材料在大气环境中（50~180℃）热氧老化降解和氧气-热-力交互作用机理，阐明基体降解、基体开裂、界面脱粘动态演变规律，从多尺度方面揭示原位力学、准静态、动态力学性质弱化及破坏机理，为纺织结构材料耐久性设计提供理论依据。
图1 外观变化
图2 3D编织和UD复合材料老化过程中裂纹空间分布及体积分数演变规律
代表性论文：
1 Wu YY, Cao WJ, Guo JH, Xun LM, Sun BZ, Gu BH. Near-fiber nanomechanical mapping and impact failure mechanism of 3D braided composites subjected to thermo-oxidative environment. Composites Science and Technology, 2021, 216: 109052.
2 Xun LM, Wu YY, Huang SW, Sun BZ, Gu BH, Hu MQ. Degradation of torsional behaviors of 3-D braided thin-walled tubes after atmospheric thermal ageing. Thin-Walled Structures, 2022, 170: 108555.
3 Ke YN, Huang SW, Guo JH, Han CF, Sun BZ, Gu BH. Effects of thermo-oxidative aging on 3-D deformation fields and mechanical behaviors of 3-D angle-interlock woven composites. Composites Structures, 2022: 281: 115116.
4 Ke YN, Sun BZ, Gu BH, Zhang W. Damage initiation and propagation mechanisms of 3-D angle-interlock woven composites under thermo-oxidative aging. Composite Structures, 2021, 259: 113462.
5 Wu YY, Xun LM, Huang SW, Ren CL, Sun BZ, Gu BH. Crack spatial distributions and dynamic thermomechanical properties of 3D braided composites during thermal oxygen ageing. Composites Part A, 2021, 144: 106355.
6 Liu SK, Zhang JJ, Chen ZT, Gu BH, Sun BZ. Modeling the coupling effects of braiding structure and thermo-oxidative aging on the high-speed impact responses of 3D braided composites. Thin-walled Structures, 2020 (May), 150: 106705.
7 Cao M, Gu BH, Sun BZ. Low-velocity impact and residual flexural behaviors of 2.5-D woven composite under accelerated thermal ageing: Experiment and numerical modelling. International Journal of Damage Mechanics, 2020, 29(3): 413–434.
8 Liu SK, Zhang JJ, Shi BH, Wang L, Gu BH, Sun BZ. Damage and failure mechanism of 3D carbon fiber/epoxy braided composites after thermo-oxidative ageing under transverse impact compression. Composites Part B, 2019(March), 161:677-690.
9 Shi BH, Liu SK, Siddique A, Du YC, Sun BZ, Gu BH. Impact fracture behaviors of three-dimensional braided composite U-notch beam subjected to three-point bending. International Journal of Damage Mechanics, 2019, 28(3): 404–426.
10 Shi BH, Zhang M, Liu SK, Sun BZ, Gu BH. Multi-scale ageing mechanisms of 3D four directional and five directional braided composites’ impact fracture behaviors under thermo-oxidative environment. International Journal of Mechanical Sciences, 2019 (May), 155: 50-65.
11 Shi BH, Liu SK, Siddique A, Zhang JJ, Gu BH, Sun BZ. Comparisons on impact fracture behavior between 3D four directional and five directional braided composite materials. International Journal of Damage Mechanics, 2019, 28(7): 990–1020.
12 Liu SK, Shi BH, Siddique A, Sun BZ, Gu BH. Numerical analyses on thermal stress distribution induced by impact compression in 3D carbon fiber /epoxy braided composite materials. Journal of Thermal Stresses, 2018, 41(7): 903-919.
13 Cao M, Wang HL, Gu BH, Sun BZ. Impact damage and compression behaviors of three-dimensional angle-interlock woven composites after thermo-oxidation degradation. Journal of Composite Materials, 2018, 52(15): 2085-2101.
14 Zhang M, Sun BZ, Gu BH. Experimental and numerical analyses of matrix shrinkage and compressive behavior of 3-D braided composite under thermo-oxidative ageing conditions. Composite Structures, 2018(November), 204: 320-332.
15 Zhang M, Sun BZ, Gu BH. Meso-structure ageing mechanism of 3-D braided composite's compressive behaviors under accelerated thermo-oxidative ageing environment. Mechanics of Materials, 2017, 115: 47-63.
16 Zhang M, Zuo CP, Sun BZ, Gu BH. Thermal ageing degradation mechanisms on compressive behavior of 3-D braided composites in experimental and numerical study. Composite Structures, 2016, 140: 180–191.
17 Zhang M, Sun BZ, Gu BH. Accelerated thermal ageing of epoxy resin and 3-D carbon fiber/epoxy braided composites. Composites Part A, 2016(June), 85: 163–171.