This study investigated the warpage of injection-molded automotive interior component (B pillar trim) fabricated with four types of short ramie fiber (RF) reinforced polypropylene (PP) composites with different fiber percentages, namely, 0RF/PP, 10RF/PP, 20RF/PP, and 30RF/PP. The effects of injection-molding process parameters and the fiber addition on the warpage of the component were investigated through numerical simulation using orthogonal experiment method. The results showed that packing pressure and filling time were the most important factors affecting warpage. And the minimal warpage values of the components made of 0RF/PP, 10RF/PP, 20RF/PP, and 30RF/PP were of 3.632, 3.698, 4.070, and 3.798 mm, respectively, at their own specific optimized process parameters. Additionally, fiber addition also plays an important role on the warping deformation of the component. The warpage increased first and then decreased with the increase of fiber addition, and an inflection point occurred at 20 wt% fiber addition. This is because the fiber orientation can promote the warping deformation, while the increase of composite’s modulus due to the fiber addition can hinder the warping deformation.
La MantiaFPMorrealeM. Green composites: a brief review. Compos Part A – Appl S2011; 42: 579–588.
6.
YuanJYuYWangQ. Modification of ramie with 1-butyl-3-methylimidazolium chloride ionic liquid. Fiber Polym2013; 14: 1254–1260.
7.
ZhouMLiYHeC. Interfacial crystallization enhanced interfacial interaction of poly (butylene succinate)/ramie fiber biocomposites using dopamine as a modifier. Compos Sci Technol2014; 91: 22–29.
8.
LiXHeLZhouH. Influence of silicone oil modification on properties of ramie fiber reinforced polypropylene composites. Carbohyd Polym2012; 87: 2000–2004.
9.
ZhouNYuBSunJ. Influence of chemical treatments on the interfacial properties of ramie fiber reinforced poly (lactic acid)(PLA) composites. J Biobased Mater Bio2012; 6: 564–568.
10.
FengYHuYZhaoG. Preparation and mechanical properties of high-performance short ramie fiber-reinforced polypropylene composites. J Appl Polym Sci2011; 122: 1564–1571.
11.
GuYTanXYangZ. Hot compaction and mechanical properties of ramie fabric/epoxy composite fabricated using vacuum assisted resin infusion molding. Mater Design2014; 56: 852–861.
12.
HoMPWangHLeeJH. Critical factors on manufacturing processes of natural fibre composites. Compos Part B – Eng2012; 43: 3549–3562.
13.
FriedrichKAlmajidAA. Manufacturing aspects of advanced polymer composites for automotive applications. Appl Compos Mater2013; 20: 107–128.
14.
PanthapulakkalSSainM. Injection-molded short hemp fiber/glass fiber-reinforced polypropylene hybrid composites – Mechanical, water absorption and thermal properties. J Appl Polym Sci2007; 103: 2432–2441.
15.
OktemHErzurumluTUzmanI. Application of Taguchi optimization technique in determining plastic injection molding process parameters for a thin-shell part. Mater Design2007; 28: 1271–1278.
16.
OzcelikBErzurumluT. Determination of effecting dimensional parameters on warpage of thin shell plastic parts using integrated response surface method and genetic algorithm. Int Commun Heat Mass2005; 32: 1085–1094.
17.
GuoWHuaLMaoH. Prediction of warpage in plastic injection molding based on design of experiments. J Mech Sci Technol2012; 26: 1133–1139.
18.
AzamanMDSapuanSMSulaimanS. Shrinkages and warpage in the processability of wood-filled polypropylene composite thin-walled parts formed by injection molding. Mater Design2013; 52: 1018–1026.
19.
HakimianESulongAB. Analysis of warpage and shrinkage properties of injection-molded micro gears polymer composites using numerical simulations assisted by the Taguchi method. Mater Design2012; 42: 62–71.
20.
AkilHMOmarMFMazukiAAM. Kenaf fiber reinforced composites: a review. Mater Design2011; 32: 4107–4121.
21.
RahmanWAWASinLTRahmatAR. Injection moulding simulation analysis of natural fiber composite window frame. J Mater Process Tech2008; 197: 22–30.
22.
AzamanMDSapuanSMSulaimanS. An investigation of the processability of natural fibre reinforced polymer composites on shallow and flat thin-walled parts by injection moulding process. Mater Design2013; 50: 451–456.
23.
HsuCIHwangJRTingPH. Influence of process conditions on tensile properties polyoxymethylene composite. J Reinf Plast Compos2010; 29: 2402–2412.
24.
GuanKKLiFYLiG. Rheological properties of slurry of foam cushion packaging based on fiber and starch. Adv Mater Res2013; 816: 1274–1277.
25.
ShiLNZhangXChenZL. Removal of chromium (VI) from wastewater using bentonite-supported nanoscale zero-valent iron. Water Res2011; 45: 886–892.
26.
OzcelikBErzurumluT. Comparison of the warpage optimization in the plastic injection molding using ANOVA, neural network model and genetic algorithm. J Mater Process Tech2006; 171: 437–445.
27.
TangSHTanYJSapuanSM. The use of Taguchi method in the design of plastic injection mould for reducing warpage. J Mater Process Tech2007; 182: 418–426.
28.
ChenCPChuangMTHsiaoYH. Simulation and experimental study in determining injection molding process parameters for thin-shell plastic parts via design of experiments analysis. Expert Syst Appl2009; 36: 10752–10759.
29.
HuangMCTaiCC. The effective factors in the warpage problem of an injection-molded part with a thin shell feature. J Mater Process Tech2001; 110: 1–9.
30.
DIN 16901:1982. Plastics mouldings – tolerances and acceptance conditions for linear dimensions.
31.
LiuCJ. Radial orientation mechanism and research of short fiber in extrusion die. Adv Mater Res2012; 476: 2271–2279.
