scholarly journals Fundamental Experiment on Invisible Crack Detection of Concrete Covered with Fiber Reinforced Polymer (FRP) through Electrical Impedance Variations and Phase Transition

2021 ◽  
Vol 32 (0) ◽  
pp. 49-57
Author(s):  
Kenji Tada ◽  
Yuji Takeda ◽  
Hiroaki Hasegawa ◽  
Isamu Yoshitake
Keyword(s):  
Phase Transition ◽  
Electrical Impedance ◽  
Crack Detection ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Fundamental Experiment

scholarly journals Improved current injection pattern for the detection of delaminations in carbon fiber reinforced polymer plates using electrical impedance tomography

2020 ◽  
pp. 147592172097230
Author(s):  
Mathias Haingartner ◽  
Sandra Gschoßmann ◽  
Max Cichocki ◽  
Martin Schagerl
Keyword(s):  
Carbon Fiber ◽  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Current Injection ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Impedance Tomography ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

In this article, we introduce a new current injection pattern for electrical impedance tomography. The pattern improves the quality of hole detection in carbon fiber reinforced polymer plates and allows the detection of delaminations. The new pattern is described in detail and compared to three widely used, classical injection patterns. The advantages of the new pattern are demonstrated by numerical finite element analyses for three test cases: a hole of 10-mm diameter, two simultaneous holes, and an ideal delamination in a circular region with a 50-mm diameter. The results are validated experimentally by comparing electrical impedance tomography measurements of a carbon fiber reinforced polymer plate with at first one, then two holes with a 10-mm diameter using classical patterns and the new pattern.

scholarly journals Analytical and Experimental Investigation into Pre-Stressed Carbon Fiber Reinforced Polymer (CFRP) Fatigue Retrofits for Steel Waterway Lock-Gate Structures

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 88
Author(s):  
Christine Lozano ◽  
Maggie Langston ◽  
Mohammad H. Kashefizadeh ◽  
Gary S. Prinz
Keyword(s):  
Experimental Investigation ◽  
Carbon Fiber ◽  
Crack Detection ◽  
The United States ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced ◽  
Lock Gate

Lock gates are an important part of the transportation infrastructure within the United States (US). Unfortunately, many existing lock gates have reached or exceeded their initial design lives and require frequent repairs to remain in service. Unscheduled repairs often increase as gates age, having a local economic impact on freight transport, which can create economic ripples throughout the nation. Metal fatigue is a key cause of unscheduled service interruptions, degrading lock gate components over time. Additionally, because lock gates are submerged during operation, crack detection prior to component failure can be difficult, and repair costs can be high. This paper presents an analytical and experimental investigation into fatigue damage within common lock gate geometries, as well as fatigue mitigation strategies with a focus on extending gate service lives. Detailed finite element analyses are combined with fatigue and fracture mechanics theories to predict critical fatigue regions within common gate details and develop retrofit strategies for mitigating fatigue cracking. Full-scale experimental fatigue testing of a critical lock gate component is conducted to provide a baseline for the evaluation of retrofit strategies. Retrofit strategies and issues in using carbon fiber reinforced polymer (CFRP) plates having optimized pre-stress levels are discussed.

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