Fiber Orientation and Warpage of Film Insert Molded Parts with Glass Fiber Reinforced Substrate
- Fiber Orientation and Warpage of Film Insert Molded Parts with Glass Fiber Reinforced Substrate
- 김성륜; 김형민; 이두진; 윤재륜; 이성희
- 복합재료; 섬유배향; 필름 삽입 사출; 휨; composite Materials; fiber orientation; Film insert molding; Warpage
- Issue Date
- VOL 25, NO 4, 117-125
- Warpage of the film insert molded (FIM) part is caused by an asymmetric residual stress distribution.
Asymmetric residual stress and temperature distribution is generated by the retarded heat transfer in the
perpendicular direction to the attached film surface. Since warpage was not prevented by controlling injection
molding conditions, glass fiber (GF) filled composites were employed as substrates for film insert molding to
minimize the warpage. Distribution of short GFs was evaluated by using micro-CT equipment. Proper models
for micro mechanics, anisotropic thermal expansion coefficients, and closure approximation should be selected in
order to calculate fiber orientation tensor and warpage of the FIM part with the composite substrate. After six
kinds of micro mechanics models, three models of the thermal expansion coefficient and five models of the
closure approximation had been considered, the Mori-Tanaka model, the Rosen and Hashin model, and the third
orthotropic closure approximation were selected in this study. The numerically predicted results on fiber
orientation tensor and warpage were in good agreement with experimental results and effects of GF
reinforcement on warpage of the FIM composite specimen were identified by the numerical results.
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