一种光纤树脂流动监测传感器

开发了一种用于树脂流动监测的新型光纤传感器。该传感器由普通多模光纤制作而成,介绍了该传感器工作原理与制作方法。利用该传感器进行了工艺监测实验,结果表明,该传感器能很好地捕捉到树脂流动前峰的发展,适合用于树脂流动监测。     

Three-dimensional finite element analysis of process-induced residual stress in resin transfer molding process

A three-dimensional finite element analysis of process-induced residual stress in resin transfer molding （RTM） process is presented. The finite element method （FEM） was employed to solve the coupled equations involved in the transient heat transfer and the cure kinetics of the resin, and the distributions of internal temperature and cure degree of the composite at any instant time were obtained. The self-consistent field micromechanics model was used to predict the cure-dependent mechanical properties of the composites. Thermal expansion and cure shrinkage were included in the analysis. The thermo-elastic mechanical governing equations were solved using the incremental stress-strain relationship based FEM and the residual stress development was predicted. The present results were validated by the comparisons with the pertinent literature. The numerical example of a half cylinder was presented. The results show that it is necessary to carry out the three-dimensional analysis due to the complex distributions of temperatures, cure degrees and process-induced stress for thick parts, which can be predicted at any point within composite structures in the present analysis.     

非对称复合材料薄层板固化变形及其应用

阐述了Rayleigh-Litz法与有限元方法在非对称复合材料薄层板固化变形预报中的应用及特点.讨论了化学收缩作用、固化周期、铺层厚度比、长宽比等对非对称复合材料层板固化变形的影响.指出了非对称复合材料薄层板固化后多稳定构型分析中有待解决的几个问题,并对其在自适应结构上的应用提出了设想.