Effect of mold temperature on motion behavior of short glass fibers in injection molding process

In injection molding process, the mold temperature can strongly affect the fiber orientation and distribution state in plastic parts. The fiber orientation behavior is discussed, and a model is used to describe the layered structure in injection parts. By studying the injected specimens, the fiber distribution and the layered structure in the part are illustrated and a variation of the fiber distribution along with the increasing of the mold temperatures is also demonstrated. The surface morphologies of the fiber-reinforced specimens at different mold temperatures are analyzed which are used to study the effect of the mold temperature on the fiber motion process of the resultant parts. Results show that in proper mold temperature, the fibers can be completely covered in polymer matrix and the mold temperature can greatly affect the part surface quality.

[1]  S. Montgomery-Smith,et al.  A systematic approach to obtaining numerical solutions of Jeffery’s type equations using Spherical Harmonics , 2010 .

[2]  S. Montgomery-Smith,et al.  Effectiveness of recent fiber-interaction diffusion models for orientation and the part stiffness predictions in injection molded short-fiber reinforced composites , 2012 .

[3]  C. Dong.  Experimental investigation on the fiber preform deformation due to mold closure for composites processing , 2014 .

[4]  M. Aigner,et al.  Influence of fiber orientation and length distribution on the rheological characterization of glass-fiber-filled polypropylene , 2013 .

[5]  Jie-Ren Shie,et al.  Optimization of injection molding process for contour distortions of polypropylene composite components by a radial basis neural network , 2008 .

[6]  Shigeki Yashiro,et al.  Particle simulation for predicting fiber motion in injection molding of short-fiber-reinforced composites , 2012 .

[7]  A. Ertas,et al.  Optimization of fiber-reinforced laminates for a maximum fatigue life by using the particle swarm optimization. Part I , 2013, Mechanics of Composite Materials.

[8]  F. Espinach,et al.  Estimation of the interfacial shears strength, orientation factor and mean equivalent intrinsic tensile strength in old newspaper fiber/polypropylene composites , 2013 .

[9]  Wei He,et al.  Exact tensor closures for the three-dimensional Jeffery's equation , 2011, Journal of Fluid Mechanics.

[10]  Su-Tae Kang,et al.  Numerical simulation of the variation of fiber orientation distribution during flow molding of Ultra High Performance Cementitious Composites (UHPCC) , 2012 .

[11]  S. Schmauder,et al.  Damage development in short-fiber reinforced injection molded composites , 2009 .

[12]  Birhan Işık,et al.  Experimental investigations of surface roughness in orthogonal turning of unidirectional glass-fiber reinforced plastic composites , 2008 .

[13]  S. Hashemi,et al.  Temperature and weldline effects on tensile properties of injection moulded short glass fibre PC/ABS polymer composite , 2007 .

[14]  J. Maia,et al.  Analysis of rheological properties of fiber suspensions in a Newtonian fluid by direct fiber simulat , 2010 .

[15]  Chih-Hung Tsai,et al.  A study of optimization of injection molding process parameters for SGF and PTFE reinforced PC composites using neural network and response surface methodology , 2012 .

[16]  G. B. Jeffery.  The motion of ellipsoidal particles immersed in a viscous fluid , 1922 .

[17]  D. Baird,et al.  Initial conditions for simulating glass fiber orientation in the filling of center-gated disks , 2013 .

[18]  R. Chien,et al.  Optimization of the injection molding process for short-fiber-reinforced composites , 2011 .

[19]  Y. Marco,et al.  Multiaxial fatigue models for short glass fibre reinforced polyamide. Part II: Fatigue life estimation , 2019 .