Performance of Nano-Filler Reinforced Composite Overwrap System to Repair Damaged Pipelines Subjected to Quasi-static an
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TECHNICAL ARTICLE—PEER-REVIEWED
Performance of Nano-Filler Reinforced Composite Overwrap System to Repair Damaged Pipelines Subjected to Quasi-static and Impact Loading Aanchna Sharma Vinod Kushvaha
. Vishwas Chandra Khan . G. Balaganesan .
Submitted: 10 April 2020 / in revised form: 20 July 2020 / Accepted: 7 September 2020 ASM International 2020
Abstract Nano-filler strengthened fiber reinforced polymer-based composite repair systems are recently being used as a promising solution for repair and rehabilitation of transmission pipelines. To increase the efficiency of pipeline repair system using these composites, the present study focuses on characterizing the effect of using nano-silica in glass fiber reinforced polymer (GFRP) composite wrap. Typically, one such widely used pipeline repair system uses 2 layers of Chopped Strand Mat and 4 layers of Woven Roving Mat. In view of this, to assess and characterize the repair system, same configuration of fibers with varying wt.% of nano-silica has been used to fabricate the composite laminates. Tensile, flexure and static indentation tests are performed to determine the mechanical properties of the prepared composites. Ballistic impact test is performed to check the impact energy absorption capability of nano-silica modified GFRP composites. GFRP composites reinforced with nano-silica showed enhanced mechanical behavior as compared to the composites without nano-silica. Upon characterization, the combination of nano-silica reinforced epoxy with best mechanical and impact properties is chosen and is used to repair the defected pipes followed by the pipe pressure testing.
A. Sharma V. Kushvaha (&) Department of Civil Engineering, IIT Jammu, Jammu and Kashmir, India e-mail: [email protected] V. C. Khan School of Mechanical Sciences, IIT Bhubaneswar, Bhubaneswar, India G. Balaganesan Department of Mechanical Engineering, IIT Jammu, Jammu and Kashmir, India
Keywords FRP repair Ballistic impact Drop weight impact Nano-silica Impact energy Pipe burst test
Introduction Polymer matrix-based composites these days are extensively used in aerospace and marine industries due to their excellent mechanical properties [1–3], corrosive resistance and electrical/thermal conductivity [4–7] combined with light weight characteristics [8]. Recently, composites have found their application in transmission pipelines sector especially in pipeline repair and rehabilitation [9–14]. In this methodology, the defected section of the damaged pipeline is filled with nano filler reinforced polymer compound and later reinforced by applying concentric layers of nano filler reinforced glass/epoxy-based composite which is overwrapped around the defected area [15]. ISO 24817 [16] and ASME PCC—2 [17] standards are in place to find the appropriate design, qualification, inspection and installation of FRP-based repair methodologies. These composites must have high resistance to impact loads as they are likely to be subjected to such loads in their life span [18]. Some of the e
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