緩衝複合材料表面螺紋印現象分析研究

Analysis and Research of buffing Print-Through Phenomenon on FRP Composite Material

李易修(Yi-Hsiu Lee)

指導教授 ： 林輝政

國立臺灣大學/工學院/工程科學及海洋工程學研究所/碩士(2009年)

https://doi.org/10.6342/NTU.2009.01116

摘要

纖維強化塑膠(FRP, Fiber Refaced Plastics)為一工業界常用的複合材料，然而其在成形後，常常發現纖維紋路慢慢浮現於FRP外層的膠殼表面，此一表面不平整的現象稱之為螺紋印現象(PTP, Print-Through Phenomenon)。FRP的母材主要為樹脂，在其硬化反應的過程裡， FRP材料各處會產生不同的溫差，由於FRP為複數材料所組成之材質，因此，此一溫差作用，將使材料有不同的收縮量，進而使FRP內部產生殘餘應力，此為PT現象的主要成因；此外，SCRIMP (Seemann Composite Resin Infusion Molding Process)為近年來常用的FRP成型工法之一，此工法主要是利用大氣壓差引導樹脂進入預擺設好之纖維中，在過程裡，此一壓差亦會使材料內部產生殘餘應力。本文利用膠殼表面反射影像做為PT現象的定性量測，並尋找合適的表面組織參數來描述PT現象；在本研究的實驗結果中可發現，隔絕不均勻應力並降低材料溫差，皆是有效降低PT現象程度的重要方式，且有顯著的效果。

關鍵字

複合材料 ； 螺紋印 ； 殘餘應力 ； SCRIMP ； 膠殼 ； 緩衝毯

並列摘要

FRP (Fiber-Reinforced Plastic) is a popular material in use for industry. However, the grains of fibers sometimes appear on the gel-coating surface of FRP because of the non-uniform residual stress inside FRP layers. This phenomenon is so called PTP (Print Through Phenomenon). The residual stress is caused by thermal difference of the plastic matrix during FRP shaping. Furthermore, SCRIMP (Seemann Composite Resin Infusion Molding Process) is a well known method for FRP shaping. In SCRIMP, atmospheric pressure difference is used to lead the matrixes into the pre-placed fibers. Sometimes, the atmospheric pressure difference during SCRIMP could produce the residual stress too. The study observes PTP by the light image from reflection on gel-coating surface. And the suitable amplitude parameters of the surface texture properties for describing PTP were found. The experimental results show that insulating residual stress and reducing temperature difference could reduce PTP, and they are both good solutions for improving PTP.

並列關鍵字

GFRP ； Print-Through ； residual stress ； SCRIMP ； core-Mat

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