湿热、紫外环境对T300/QY8911复合材料孔板静力性能的影响

Effects of hygrothermal and ultraviolet conditions on static properties of T300/QY8911 laminated composites containing an open hole

采用试验方法研究了湿热、紫外环境对T300碳纤维/QY8911双马树脂复合材料静力拉伸和压缩性能的影响。针对T300/QY8911复合材料层板的中心开孔试件,进行了常温干态、湿热环境、紫外辐射以及湿热和紫外共同作用下的静力拉伸和压缩试验。吸湿试验的结果表明,T300/QY8911复合材料试件的平衡吸湿率在0.6%左右。静力试验的结果表明:孔板的拉伸强度受到环境的影响较小;湿热会降低由基体性能主导的压缩强度、刚度等复合材料性能,吸湿后75℃和105℃环境下试验件压缩强度分别下降6.8%和20.3%;而紫外使复合材料孔板的压缩强度有所升高,300 MJ/m2以上的紫外辐射量使试验件的压缩强度提高了10%左右,显示其对复合材料的性能有着更为复杂的影响规律,并且可能与湿热的影响存在交互作用。

The environmental effects of the hygrothermal and UV （ultraviolet） conditions on earbon/bismaleimide composites＇ static tensile and compressive properties were presented. Specimens with open holes, manufactured by T300/QY8911 laminates, were tested under the environments of normal, hygrothermal, UV and hygrothermal/ UV. The moisture absorption tests results indicate that the balance moisture content of the specimens is around 0.6%. The static tests reveal that the tensile strength is hardly affected by the environments. The compressive strength and modulus of the laminates, dominated by the matrix, are reduced by the hygrothermal conditions. The compressive strength of specimen decreases by 6.8% and 20.3% on the condition of 75℃ and 105℃ after moisture absorption, respectively. However, the compressive strength increases by about 10% after UV exposure （above 300 MJ/m^2）, indicating their influence on the composite material is more complex, as interaction of the hygrothermal and UV conditions may exist.