环氧树脂/碳纤维复合材料模压制品翘曲变形的影响因素分析

Analysis of influencing factors of warpage deformation of epoxy/carbon fiber composite⁃molded products

围绕环氧树脂/碳纤维片状模塑料模压平板制品深入研究了翘曲变形问题。用三坐标测量仪测得平板制品的平面度以表征制品的翘曲变形量。通过邓肯法多重比较各因素的水平显著性影响差异并进一步分析了各工艺参数对制品翘曲变形的影响趋势;同时分析了纤维分布、孔隙特征、上下模具温度、型腔压力分布等对制品翘曲的影响机理。结果表明,制品翘曲量分布在0.302~1.29 mm之间;通过正交实验方差分析得到模压成型工艺参数对翘曲变形的影响大小顺序为:模压压力(P)>合模速度(v)>保压时间(t)>模压温度(T),影响制品翘曲变形的显著性因素是模压压力。

This article addressed the issue of warping deformation in epoxy resin/carbon fiber sheet⁃molded composite flat panel products.,the flatness of the panel products was measured to characterize the extent of warping deformation by us⁃ing a three⁃coordinate measurement device.The results indicated that the warping deformation varied from 0.302 to 1.29 mm.Through an orthogonal experimental variance analysis,the significance of various molding process parameters on warping deformation was determined with molding pressure having the most significant impact,followed by demold⁃ing speed,holding pressure time,and molding temperature.Furthermore,a Duncan's multiple comparison method was used to assess the differences in the significance levels among these factors,the trends in the influence of each process pa⁃rameter on warping deformation in the products was further analyzed.The mechanism of influence factors for the warping of the products was analyzed,and these factors include fiber distribution,pore characteristics,upper and lower mold tem⁃peratures,and cavity pressure distribution.