The Study of Exciting Print-Through Phenomenon on the Surface of GFRP Materials by using Piezoelectric Vibration
Date Issued
2011
Date
2011
Author(s)
Tan, Yu-Hao
Abstract
Vacuum Assisted Resin Transfer Molding (abbr. VARTM) is one of the advanced molding processes of Glass Fiber-Reinforced-Plastic (abbr. GFRP). If the resin flow medium patented by Seemann Corp. is used in VARTM, the process will be called Seemann Composite Resin Infusion Molding Process (abbr. SCRIMP).The main reason that caused PTP is due to thermal shrinkage of the plastic matrix during cooling process. Furthermore, the atmospheric pressure during SCRIMP process is one of the main reason that produce residual stress.
For the study of Print-Through Phenomenon (abbr.PTP), the amplitude parameter of the surface texture properties has been carried out, the average roughness (Ra) is measured to objectively determine the existence of PTP and its level. Besides that, the measuring results also revealed that PTP can be eliminated by polishing the surface of GFRP. Therefore, PTP is a visual problem of the tiny deformation of the surface.
This paper presents three frequency levels by using piezoelectric to vibrate the GFRP specimens and discovered that it could accelerate the PTP reveal on the gel-coating surface effectively by using the average roughness (Ra) above to determine the existence of PTP and its level. Frequency remain an important factor that in accelerating the PTP. In this paper has further discussing on choosing the appropriate frequency and its results. By using ABAQUS to simulate the main variable that control residual stress relief in the GFRP specimen.
Subjects
GFRP
PTP
residual stress
gel-coating
piezoelectric
Type
thesis
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