FIBER ORIENTATION AND MECHANICAL-PROPERTIES OF SHORT-FIBER-REINFORCED INJECTION-MOLDED COMPOSITES - SIMULATED AND EXPERIMENTAL RESULTS

被引:186
作者
GUPTA, M
WANG, KK
机构
[1] Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York
关键词
D O I
10.1002/pc.750140503
中图分类号
TB33 [复合材料];
学科分类号
摘要
A numerical simulation is presented that combines the flow simulation during injection molding with an efficient algorithm for predicting the orientation of short fibers in thin composite parts. Fiber-orientation state is represented in terms of a second-order orientation tensor. Fiber-fiber interactions are modeled by means of an isotropic rotary diffusion. The simulation predicts flow-aligned fiber orientation (shell region) near the surface with transversely aligned (core region) fibers in the vicinity of the mid-plane. The effects of part thickness and injection speed on fiber orientation are analyzed. Experimental measurements of fiber orientation in plaque-shaped parts for three different combinations of cavity thickness and injection speed are reported. It is found that gapwise-converging flow due to the growing layer of solidified polymer near the walls tends to flow-align the fibers near the entrance, whereas near the melt front, gapwise-diverging flow due to the diminishing solid layer tends to align the fibers transverse to the flow. The effect of this gapwise-converging-diverging flow is found to be especially significant. for thin parts molded at slower injection speeds, which have a proportionately thicker layer of solidified polymer during the filling process. If the fiber orientation is known, predictions of the anisotropic tensile moduli and thermal-expansion coefficients of the composite are obtained by using the equations for unidirectional composites and taking an orientation average. These predictions are found to agree reasonably well with corresponding experimental measurements.
引用
收藏
页码:367 / 382
页数:16
相关论文
共 50 条
[21]   Optimizing mechanical properties of injection-molded long fiber-reinforced polypropylene [J].
Youssef, Al Herz ;
Madhuranthakam, Chandra Mouli R. ;
Elkamel, Ali ;
Mittal, Vikas .
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS, 2015, 28 (06) :849-862
[22]   Mechanical Properties of Injection-molded Natural Fiber-reinforced Polypropylene Composites: Formulation and Compounding Processes [J].
Sun, Zhan-Ying ;
Han, Hai-Shan ;
Dai, Gan-Ce .
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES, 2010, 29 (05) :637-650
[23]   ON THE MECHANICAL RESPONSE OF SHORT-FIBER-REINFORCED POLYMER COMPOSITES [J].
BIOLZI, L ;
CASTELLANI, L ;
PITACCO, I .
JOURNAL OF MATERIALS SCIENCE, 1994, 29 (09) :2507-2512
[24]   Mechanical properties of injection-molded carbon fiber/polypropylene composites hybridized with nanofillers [J].
Arao, Y. ;
Yumitori, S. ;
Suzuki, H. ;
Tanaka, T. ;
Tanaka, K. ;
Katayama, T. .
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, 2013, 55 :19-26
[25]   Prediction of fiber orientation structure for injection molded short fiber composites [J].
Lee, SW ;
Youn, JR ;
Hyun, JC .
MATERIALS RESEARCH INNOVATIONS, 2002, 6 (04) :189-197
[26]   The effect of extensional viscosity on the core structure of fiber orientation for injection-molded fiber composites [J].
Tseng, Huan-Chang .
INTERNATIONAL POLYMER PROCESSING, 2023, 38 (04) :456-471
[27]   IMAGE-PROCESSING BASED METHOD OF PREDICTING STIFFNESS CHARACTERISTICS OF SHORT-FIBER-REINFORCED INJECTION-MOLDED PARTS [J].
SIRKIS, JS ;
CHENG, A ;
DASGUPTA, A ;
PANDELIDIS, I .
JOURNAL OF COMPOSITE MATERIALS, 1994, 28 (09) :784-799
[28]   EFFECT OF FIBER ORIENTATION AND ASPECT RATIO ON THE MECHANICAL-PROPERTIES OF SHORT FIBER COMPOSITES [J].
KACIR, L ;
MASOUMY, E ;
KARDOS, JL .
JOURNAL OF RHEOLOGY, 1980, 24 (06) :902-902
[29]   MEASURING THE FIBER ORIENTATION AND MODELING THE ELASTIC PROPERTIES OF INJECTION-MOLDED LONG-GLASS-FIBER-REINFORCED NYLON [J].
HINE, PJ ;
DAVIDSON, N ;
DUCKETT, RA ;
WARD, IM .
COMPOSITES SCIENCE AND TECHNOLOGY, 1995, 53 (02) :125-131
[30]   Numerical Prediction of Fiber Orientation in Injection-molded Short-fiber/Thermoplastic Composite Parts with Experimental Validation [J].
Thanh Binh Nguyen Thi ;
Morioka, Mizuki ;
Yokoyama, Atsushi ;
Hamanaka, Senji ;
Yamashita, Katsuhisa ;
Nonomura, Chisato .
PROCEEDINGS OF PPS-30: THE 30TH INTERNATIONAL CONFERENCE OF THE POLYMER PROCESSING SOCIETY, 2015, 1664