复合材料厚板结构中起鼓缺陷对抗压性能影响的试验研究

EXPERIMENTAL STUDY ON BULKING DEFECTS EFFECTING ON COMPRESSION BEHAVIOR OF THICK FRP LAMINATES

利用真空导入工艺生产的纤维增强复合材料往往存在诸多起鼓现象。本文利用精密加工的钢材模具生产的构件进行轴压试验,得到正常构件与起鼓构件的荷载-位移曲线和破坏模式。试验显示起鼓构件的承载力为正常构件的66.4%,且起鼓构件均在外层树脂出现贯通竖向裂缝。结合有限元建模的手段,得出了基于树脂部分Mises应力的强度校核准则。

FRP （fiber reinforced polymer） materials made from VARTM （Vacuum-Assisted Resin Transfer Molding） could be manufactured with various bulking defects.This article employs thick-slab FRP members which was manufactured by steel molds of high precision to derive the load-displacement curve of normal specimen and bulking specimen under compression.The experiment shows that the compression capacity of bulking members is merely 66.4％ of the normal specimen,with the axial cracks occurring near the outward resin part.With FEM methods,a strength criterion of Mises stress of resin is derived and testified.