Formability of CFRTP prepreg considering heat transfer

• Published in: International Journal of Precision Engineering and Manufacturing-Green Technology, 4(2) Vol. 4; no. 2; pp. 161 - 168
• Main Authors: Lee, Jeong-Min, Kim, Byung-Min, Min, Byeong-Jin, Park, Joon-Hong, Ko, Dae-Cheol
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society for Precision Engineering 01.04.2017; Springer Nature B.V; 한국정밀공학회
• Subjects: Carbon fiber reinforced plastics; Computer simulation; Defects; Deformation mechanisms; Energy Efficiency; Engineering; Fiber reinforced polymers; Finite element method; Formability; Forming; Heat transfer; Heat transfer coefficients; Industrial and Production Engineering; Regular Paper; Reliability analysis; Sustainable Development; Temperature; Temperature dependence; Temperature effects; Temperature gradients; 기계공학; Inverse analysis; Bias extension test; Prepreg compression forming; Carbon-fiber-reinforced thermoplastic; Thermal shear behaviors; Hemispherical punch drawing test
• ISSN: 2288-6206; 2198-0810
• DOI: 10.1007/s40684-017-0020-3

Carbon-fiber-reinforced thermoplastic (CFRTP) laminate undergoes large deformations and slip between each layer during the prepreg compression forming (PCF) process. Particularly, the formability of CFRTPs varies for each layer as a result of the temperature difference during heat transfer between tool and laminate because of the viscosity of resin. These behaviors affect the final product quality and may create related defects such as wrinkling, and delamination. The objective of this study is to predict the defects by using the finite element method (FEM) considering the heat transfer according to the forming temperature. The bias extension were performed to measure the shrar properties (which are dependent on temperature) at 150°C, 170°C, and 190°C. In addition, the heat transfer coefficient between tool and laminate was measured using the inverse analysis method. The effect of tool temperature on formability of CFRTP prepreg was investigated by FE analysis of the hemispherical punch drawing test. To verify the reliability of the FE analysis, hemispherical punch drawing experiments were performed under the same conditions as those of the FE analysis. The deformed shear angle of CFRTP specimens in the experiment were compared with simulation results. Finally, the temperatures were evaluated to investigate the effects of temperature variation caused by heat transfer.