Strength of continuous fiber type CFRTP is large, however formability isrestricted. On the contrary, discontinuous fiber type CFRTP is vice versa. Authorstried to obtain better balance between strength and formability by following process.(1) To induce fine cut group to CFRTP woven fabric prepreg sheet.(2) Sheets of prepreg were layered and consolidated to panel.Fine cut group was induced by fiber laser. Cutting condition was selected so asnot to as much as possible to cause heat affected zone. Then GFRTP prepreg sheetwas added on both surface to improve strength.Tested materials were TPS and PA66 matrix CFRTP. Formability test andstrength test was conducted. Hemispherical shape forming test was conducted asformability test.Results were as follows.1) Formability was improved by inducing fine cut group, especially panel in whichboth 0/90 °layer and ±45°layer were mixed could be formed. Strength of panelwith fine cut group was about half of the panel without fine cut group. This valuewas sufficiently strong compared with the CFRTP panel of discontinuous fiber.2) Adding GFRTP prepreg sheet to CFRTP panel with fine cut group on bothsurface did not restrict formability, but showed better effect to forming products.3) Fracture load of panel by adding GFRTP prepreg sheet showed large increase.The amount of increase was much larger than the added strength of GFRTP.
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