短玻纤增强聚丙烯水辅助注射成型纤维取向数值模拟
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摘要
基于Folgar-Tucker纤维取向模型,利用Moldex3D对三维长直管件进行溢流法水辅助注射成型可视化研究。结果表明,在制品初始段位置的水道层区域纤维取向倾向于无序状态,而在制品的中间段及末尾段位置的纤维倾向于沿流动方向形成取向;通过适当的增加注水延迟时间可以有效地改善制品初始段位置的纤维沿流动方向的取向。另外,还发现沿流动方向的纤维取向最有序的位置是靠近壳层位置的芯层区域;在制品的末端位置,注水压力、熔体温度显著影响纤维沿流动方向的取向。
Based on the Folgar-Tucker fiber orientation model, the visualization of water-assisted injection molding three-dimensional long straight pipe was carried out by using Moldex3D. It is found that the fibers in the water channel layer near water inlet tend to be disordered, whereas at the position near the middle and end of water channel, fibers tend to orienting along flow direction; by appropriately increasing the water injection delay time can result in more fibers at the initial direction of the product orienting along the flow direction. In addition, it has also been found that the glass fibers are orientated remarkably in the core layer and slightly in the region near the mold wall. At the end position of the product, the water injection pressure and melt temperature can significantly affects the orientation of the fibers along the flow direction.
Based on the Folgar-Tucker fiber orientation model, the visualization of water-assisted injection molding three-dimensional long straight pipe was carried out by using Moldex3D. It is found that the fibers in the water channel layer near water inlet tend to be disordered, whereas at the position near the middle and end of water channel, fibers tend to orienting along flow direction; by appropriately increasing the water injection delay time can result in more fibers at the initial direction of the product orienting along the flow direction. In addition, it has also been found that the glass fibers are orientated remarkably in the core layer and slightly in the region near the mold wall. At the end position of the product, the water injection pressure and melt temperature can significantly affects the orientation of the fibers along the flow direction.
引文
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[13] Liu S J,Lin M J,Wu Y C.An experimental study of the water-assisted injection molding of glass fiber filled poly-butylene-terephthalate (PBT) composites[J].Compos.Sci.Technol.,2007,67:1415-1424.
[14] Huang H X,Zhou R H,Yang C.Fiber orientation propelled by high-pressure water penetration in water-assisted injection molded fiber-reinforced thermoplastics part[J].J.Compos.Mater.,2013,47:183-190.
[15] 汪志泳,黄汉雄,汪斌.水辅助注塑中高压水穿透过程的数值模拟[J].化工学报,2013,64(4):1170-1175.Wang Z Y,Huang H X,Wang B.Numerical simulation of water penetration in water-assisted injection molding[J].CIESC Jorunal,2013,64(4):1170-1175.
[2] Liu S J,Lin C H.An experimental study of water-assisted injection molding of plastic tubes with dimensional transitions[J].J.Reinf.Plast.Compos.,2007,26:1441-1454.
[3] Liu S J,Wu Y C,Chen W K.Surface gloss difference on water assisted injection moulded thermoplastic parts:effects of processing variables[J].Plast.Rubber Compos.,2006,35:29-36.
[4] Liu S J.Water assisted injection molding:a review[J].Int.Polym.Process.,2009,24:315-325.
[5] Sannen S,Puyvelde P,Keyzer J.Defect occurrence in water-assisted injection-molded products:definition and responsible formation mechanisms[J].Adv.Polym.Technol.,2015,34:DOI:10.1002/adv.21476.
[6] Park H,Cha B S,Rhee B.Experimental and numerical investigation of the effect of process conditions on residual wall thickness and cooling and surface characteristics of water-assisted injection molded hollow products[J].Adv.Mater.Sci.Eng.,2015,2015,DOI:10.1155/2015/701940.
[7] Huang H X,Deng Z W.Effects and optimization of processing parameters in water‐assisted injection molding[J].J.Appl.Polym.Sci.,2008,108:228-235.
[8] Ahmadzai A Z,Behravesh A H.Effect of processing parameters on water penetration in water assisted injection molding of ABS[J].Polimery,2011,56:232-239.
[9] Yang J G,Zhou X H,Luo G P.Study of water penetration length and processing parameters optimization in water-assisted injection molding[J].Int.J.Adv.Manuf.Technol.,2013,69:2605-2612.
[10] 章凯,匡唐清,柳和生,等.基于粘弹本构的水辅注塑充填过程的仿真分析[J].高分子材料科学与工程,2014,30(9):93-96.Zhang K,Kuang T Q,Liu H S,et al.Simulation and Analysis of mold filling in water-assisted injection molding of viscoelastic polymers[J].Polymer Materials Science & Engineering,2014,30(9):93-96.
[11] 章凯,匡唐清,柳和生,等.注水压力对圆管件水辅注塑填充过程的影响[J].高分子材料科学与工程,2016,32(6):113-117.Zhang K,Kuamg T Q,Liu H S,et al.Influence of water injection pressure on water-assisted injection molding filling process[J].Polymer Materials Science & Engineering,2016,32(6):113-117.
[12] Liu S J,Chen Y S.The manufacturing of thermoplastic composite parts by water-assisted injection-molding technology[J].Composites Part A,2004,35:171-180.
[13] Liu S J,Lin M J,Wu Y C.An experimental study of the water-assisted injection molding of glass fiber filled poly-butylene-terephthalate (PBT) composites[J].Compos.Sci.Technol.,2007,67:1415-1424.
[14] Huang H X,Zhou R H,Yang C.Fiber orientation propelled by high-pressure water penetration in water-assisted injection molded fiber-reinforced thermoplastics part[J].J.Compos.Mater.,2013,47:183-190.
[15] 汪志泳,黄汉雄,汪斌.水辅助注塑中高压水穿透过程的数值模拟[J].化工学报,2013,64(4):1170-1175.Wang Z Y,Huang H X,Wang B.Numerical simulation of water penetration in water-assisted injection molding[J].CIESC Jorunal,2013,64(4):1170-1175.