纺织复合材料细观损伤破坏的力学表征

Through exploring and refining, a set of methods were developed for experimental investigation on microscopic damage and fracture mechanics of composite materials. The dynamic evolution processes of microscopic deform, damage and fracture of carbon fabric/resin and glass fabric/ resin composites were in-situ studied by loading specimens inside a scanning electron microscope (SEM). It was found.that the location of a precrack (inside warp tow, surface layer of a warp tow, fiber/resin interphase and resin rich zone) plays an important rule in resistance to the damage and fracture of a sample. The toughening mechanisms were also investigated for the composite.with hybrid resin matrix. It was indicated that the PEK adding toughened both fiber/resin interphase and resin matrix, which led to the mechanism of damage and fracture of the material to transform from.the brittle to the tough. In addition, a new composite_ramie fabric/resin composite was explored. The mechanical performance.evaluation and microstructure analysis of fracture surface were conducted. The effects of fiber surface condition and fabric volum content were compared.

用细观损伤力学、断裂力学、材料科学和纺织工程学相结合的方法，研究纺织复合材料的细观损伤破坏力学行为。在扫描电镜内对试样施加工型、II型和疲劳载荷，在位观察材料变形、损伤及破坏的动态演化过程，用扫描电镜电子束刻印法直接测量应变场和损伤区，探讨材料宏观损伤破坏的细观机制，并对其细观损伤破坏行为进行力学表征。.