Hasarlý borularýn tamirinde yama malzemesinin yapýþtýrýcý üzerine etkilerinin incelenmesi

Ýç basýnca maruz borular sýcaklýk ve basýncýn deðiþmesi sonucunda hasara uðramaktadýr. Hasara uðrayan bu borularýn onarýlmasý son yýllarda hemen hemen her türlü alanda yaygýn bir þekilde kullanýlmakta olan yapýþtýrma baðlantýlarýyla yapýlmaktadýr. Yapýþtýrma baðlantýlarýnda birleþtirilecek olan malzemeler ayný türden ya da farklý türden olabilmektedir. Yapýþtýrýcýlar farklý malzemelerde farklý mukavemet deðerleri sergileyebileceðinden dolayý hasara uðramýþ borunun yapýþtýrýcý ile tamir edilmesinde malzeme seçimi büyük önem taþýmaktadýr. Bu çalýþmada, hasara uðramýþ galvanizli çelik borularýn tamirinde kompozit, alüminyum ve çelik olmak üzere üç farklý yama malzemesi seçilerek yapýþtýrýcý üzerinde nasýl bir mekanik davranýþ sergileyeceði araþtýrýlmýþtýr. Ýç basýnca maruz boru tesisatlarýnda meydana gelen hasarlar, farklý yama malzemeleri kullanýlarak tek tip yapýþtýrýcý ile birleþtirilmiþ nümerik ve deneysel olarak incelenmiþtir. Bunun için galvanizli borular üzerine çatlak oluþturulmuþ 7 (2 mm), 9 (2.6 mm) ve 11 (3.2 mm) tabakadan oluþan düz örgülü karbon fiber kompozit yamalar, alüminyum yamalar ve çelik yamalar iki bileþenli akrilik yapýþtýrýcý (DP810) ile birleþtirilmiþtir. Tamir edilen borulara iç basýnç uygulanmýþ, yama kalýnlýðý yama bindirme açýlarý ve bindirme uzunluklarýna baðlý olarak yapýþtýrýcý üzerinde etkileri incelenmiþtir.

Effects of patch material on the adhesive in the repair of damaged pipes

Pipes exposed to internal pressure are damaged due to the change in temperature and pressure. In the repair of these damaged pipes, adhesively bonded joints, which have been widely used in almost all kinds of fields in recent years, are used. Materials to be bonded in adhesively bonded joints may be of different types or the same type. Material choice has great importance in the repair of damaged pipe with adhesive because adhesives may exhibit different strength values in different materials. In this study, three different patching materials including composite, aluminum and steel were selected for the repair of damaged galvanized steel pipes, and how they would exhibit a mechanical behavior on the adhesive was investigated. Damages that had occurred in pipe installations exposed to internal pressure were bonded with a uniform adhesive and investigated numerically and experimentally. Therefore, cracks were formed in the galvanized pipes, and flat braided carbon fiber composite, aluminum and steel patches consisting of 7 (2 mm), 9 (2.6 mm) and 11 (3.2 mm) layers were bonded with two-component acrylic adhesives (DP810). Internal pressure was exerted to the repaired pipes, and the effects on the adhesive of patch material depending on the patch thickness, overlapping angles and overlapping length were investigated.