L型CFRP构件R区微观形态及孔隙特征

Microstructure and feature of pores for corner of L-shape CFRP components

对8块L型CFRP构件R区的微观组织形态进行观察,其中构件R区的拐角半径均为10mm,厚度均为5mm,孔隙率为0.54%~2.48%,在观察的基础上分析R区的主要微缺陷类型及孔隙形态分布特征.结果表明：L型CFRP构件R区的主要缺陷类型为富树脂、微裂纹和孔隙;孔隙主要分布在富树脂区和纤维层内,层间孔隙很少;所观察构件的孔隙长度为12-411μm,孔隙宽度为7-289μm,孔隙率越大,孔隙平均长度、宽度和面积越大;对于单个样本的统计数据,孔隙长度和宽度分别与孔隙数量百分比之间存在近似的对数正态分布关系;随着孔隙率的增大,形状不规则、面积较大的孔隙增多,孔隙的形状因子和宽长比总体上都有减小的趋势.

The microstructure of the corner of L-shape carbon fiber reinforced polymer （CFRP） components was observed. The number of components was eight. The radius of the corner of every component is 10 mm and the thickness is 5 mm. The porosity of the components ranges from 0.54% to 2.48 %. The main types of micro-defects as well as the feature of morphology and distribution of the pores which were in the corner of L-shape CFRP components were analyzed based on the observation. The rich resin, micro-crack and pore are the main types of micro-defects in the corner of L-shape CFRP components. The pores are mainly distributed in rich resin regions or in fiber layers. The pores in interlayers are very rare. The length of the observed pores ranges from 12 to 411 μm, and the width of the pores ranges from 7 to 289μm. The length, width and area of the pores all increase as the pore content rises. For the statistical data of a single sample, the length and width of the pores respectively has approximate lognormal distribution relationship with the number percentage of pores. As the pore content rises, the number of pores which are irregular and large increases, and the shape factor of the pores and the pore width to length ratio all tend to decrease.