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Experimental Investigation on Debonding between FRP sheets and Structures
Haghighi, Sina | 2017
1952
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- Type of Document: M.Sc. Thesis
- Language: English
- Document No: 51403 (53)
- University: Sharif University of Technology, International Campus, Kish Island
- Department: Science and Engineering
- Advisor(s): Toufigh, Vahab
- Abstract:
- This study has investigated the effects of different environmental conditions on the bond at the interface between two fiber reinforced polymer (FRP) layers. A total of 945 single lap splice coupons with three bond length were made using wet lay-up technic. There were used three unidirectional fabrics and one type of epoxy resin. A Uniaxial tensile test was performed on samples after 2, 4, 12, 20, 28, 36 and 48 weeks of exposure. Also series of test were conducted in order to determine the minimum lap splice length of single splice FRP samples. The experimental results indicated reduction of bond strength in glass specimens that was 17 % after 48 weeks of exposure while for same amount of time, the reduction in aramid and carbon specimens were smaller than 10%. The effects of alkaline solutions on reducing the bond strength of glass specimens was more than other fabrics while carbon specimens showed excellent durability against all solutions. Change of failure modes in aramid, carbon and glass fibers were observed during this investigation and after 48 weeks of exposure, failure in glass and aramid specimens with 2.54 and 5.08 cm length of bond that was occurred at the bonding area. Failure of carbon specimens was explosive and the area of the failure was not predictable
- Keywords:
- Fiber Reinforced Polymer (FRP) ; Glass Fibers ; Carbon Fibers ; Aramid Fiber ; Effective Length
Digital Object List-
محتواي کتاب - view
Bookmark- List of Figures
- List of Tables
- 1.1 Introduction
- 1.2 Previous work
- 1.2.1 Environmental effects on the bond and the interface of FRP and concrete
- 1.2.2 Environmental effects on the bond at the interface of FRPs and Steel
- 1.2.3 Environmental effects on the bond at the interface of FRPs and masonry
- 1.2.4 Environmental effects on the bond at the interface of FRPs and timber
- 1.2.5 Environmental effects on the mechanical properties of FRPs
- 1.3 Scope and objectives
- 2.1 Fiber reinforced polymer
- 2.2 Environments
- 2.2.1 Acid (pH of 2.5)
- 2.2.2 Alkaline (pH of 10 and 12.5)
- 2.2.3 Seawater (pH of 7.25)
- 2.2.4 Fresh water (pH of 7)
- 2.3 Standards
- 2.4 Reservoirs
- 2.5 Testing Program
- 2.5.1 Minimum lap spliced length
- 2.5.2 Single-lap shear test procedure
- 3.1 Abstract
- 3.2 Results and Discussion
- 3.2.1 Acidic solution (pH of 2.5)
- 3.2.2 Alkaline solutions (pH of 10)
- 3.2.3 Alkaline solutions (pH of 12.5)
- 3.2.4 Sea water solutions (pH of 7.25)
- 3.2.5 Fresh water solutions (pH of 7)
- 3.2.6 Modes of failure
- 4.1 Abstract
- 4.2 Results and discussion
- 4.2.1 Acidic solution (pH of 2.5)
- 4.2.2 Alkaline solutions (pH of 10)
- 4.2.3 Alkaline solutions (pH of 12.5)
- 4.2.4 Sea water solutions (pH of 7.25)
- 4.2.5 Fresh water solutions (pH of 7)
- 4.2.6 Modes of failure
- 5.1 Abstract
- 5.2 Results and discussion
- 4.2.1 Acidic solution (pH of 2.5)
- 4.2.2 Alkaline solution (pH of 10)
- 4.2.3 Alkaline solution (pH of 12.5)
- 4.2.4 Sea water solution (pH of 7.25)
- 4.2.5 Fresh water solution (pH of 7)
- 4.2.6 Modes of failure
- 6.1 Summary and conclusions
- 6.2 Direction to Future Work
- References