掺混型碳化硅纤维微波吸收剂的制备

运用功率超声将平均粒径３０ｎｍ的超细金属铁粉均匀分散到聚碳硅烷中，通过熔融纺丝，不熔化处理，烧结，制备出具有良好力学性能，电阻率连续可调的掺混弄烨奔走陶瓷纤维。     

APC—2／AS4预浸料带热芯缠绕的显微特征

通过对ＡＰＣ－２／ＡＳ４热塑性预浸带缠绕过程的研究，分析了缠绕管件的断面显微特征，认为热塑性预浸带热芯缠绕成形过程中，形成孔隙的主要原因是层间的不良浸渍而非基体的降解。提高缠绕张力和树脂含量有利于孔隙的消除，但又对制件中树脂的均匀性及外表面尺寸稳定性有影响。     

湿热谱老化对复合材料层压板强度的影响

通过湿热谱老化试验,研究了湿热谱老化对复合材料层压板拉伸和冲击后压缩（CAI）强度的影响。试验结果表明,湿热老化引起严重的强度降,特别是冲击后压缩强度。老化后损伤面积不扩展或扩展很小。     

不同氧化剂处理的碳纤维对硅橡胶包覆层材料性能的影响研究

研究了不同氧化剂处理的碳纤维对硅橡胶包覆层材料拉伸强度和粘接剪切强度的影响。结果表明：采用５％ＫＭｎＯ４＋１０％Ｈ２ＳＯ４溶液处理碳纤维的效果最佳。     

碳/碳复合摩擦材料制备新工艺研究

研究了用新工艺快速定向流动法化学气相沉积碳 /碳复合摩擦材料的制备工艺。对总体方案进行了分析 ,确定了最优工艺参数 ,所得制品具有良好的摩擦磨损性能。并探索了沉积温度、炉压、气体流量等工艺参数及石墨化处理工艺对制备工艺和材料性能的影响     

新型碳纤维点阵复合材料技术研究

为了制备新型轻质高强材料,研究了满足拉伸主导型设计和临界细长比限制的点阵材料构形特征.针对碳纤维复合材料特点,开发了三维穿插编织工艺,在此基础上设计制备了碳纤维点阵复合夹层梁结构.对比蜂窝和碳泡沫材料分析点阵夹层结构的基本力学性能.研究表明点阵夹层结构具备整体成型、不发生层间脱胶破坏、比刚度和比强度高等优点,是一种很有前景的新型航空航天材料.     

树脂配制方法的改进对双马树脂及预浸料性能影响

提出浆料混合法配制热塑性树脂改性聚醚酮(PEK-C)增韧的双马树脂,研究浆料混合法配制的双马树脂及其T700碳纤维预浸料的基本性能,并与传统热熔法进行比较.结果发现,与传统热熔法相比,浆料混合法显著提高树脂和预浸料的粘性和室温储存稳定性,预浸料由传统的无粘性变成粘性和可操作性良好,室温粘性和力学性能储存期由原来的20天提高到至少三个月以上,并且制备预浸料的涂布头温度和热压辊温度可降低30～40℃左右,明显改进了预浸料的制备工艺.复合材料的力学性能和耐热性测试结果表明,改变树脂配制方法对复合材料的力学性能和耐热性没有影响.     

Non-destructive Evaluation of Composite Pressure Vessel by Using FBG Sensors

In recent years, advanced composite structures are used extensively in many industries such as aerospace, aircraft, automobile, pipeline and civil engineering. Reliability and safety are crucial requirements posed by them to the advanced composite structures be- cause of their harsh working conditions. Therefore, as a very important measure, structural health monitoring (SHM) in-service is defi- nitely demanded for ensuring their safe working in-situ. In this paper, fiber Bragg grating (FBG) sensors are surface-mounted on the hoop and in the axial directions of a FRP pressure vessel to monitor the strain status during its pressurization. The experimental results show that the FBG sensors could be used to monitor the strain development and determine the ultimate failure strain of the composite pressure vessel.     

Development of PLC-based Tension Control System

Fiber winding tension is an important factor in the molding techniques of composite material which influences the quality of winding product directly, and the tension control is a key technique in fiber winding techniques. This paper introduces a closed-loop tension control system with the programmable logic controller (PLC) with function modules as its control kernel, the alternating current (AC) servo motor as execute element and the radius-following device to accomplish the real-time radius compensation. The mechanism of the tension control system is analyzed and the numerical model is set up. The compensation technique of the radius of the scroll is analyzed. Experimental results show that the system is well qualified with high control precision and high reaction speed.     

Large Amplitude Flexural Vibration of the Orthotropic Composite Plate Embedded with Shape Memory Alloy Fibers

研究了形状记忆合金(SMA)纤维混杂复合材料大挠度层合板的非线性自由与受迫振动特性。基于描述SMA力学行为的Brinson理论以及层合板材料性能预测的混合率,建立了SMA纤维混杂复合材料大挠度层合板的本构方程,基于对称层合各向异性弹性板的非线性理论,建立了以横向挠度和应力函数表示的板的横向振动方程和相容方程。采用Galerkin近似解法将振动方程化为时间变量的含有3次非线性项的Duffing型常微分方程,采用谐波平衡法(HBM)获得系统的固有频率方程和强迫振动稳态频率响应方程。数值计算表明,非线性板自由振动频率比与激励温度的关系具有与线性板相同的特征,马氏体相向奥氏体相转变阶段温度对板的振动频响特性曲线的影响最显著,同时也讨论了SMA纤维含量、板的纵横比以及自由振动幅值对板的非线性频率比的影响。