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  • Improved SH0 Guided Wave Tr... Improved SH0 Guided Wave Transducers Based on Piezoelectric Fiber Patches
    Kim, Yongtak; Gaul, Tobias; Köhler, Bernd Sensors, 07/2019, Volume: 19, Issue: 13
    Journal Article
    Peer reviewed
    Open access

    A piezoelectric fiber patch (PFP) is a transducer type that is suitable for guided-wave-based structural health monitoring (SHM) due to its light, thin, and flexible characteristics. In our previous ...
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2.
  • Origami-inspired reforming ... Origami-inspired reforming method for carbon fiber-reinforced thermoplastics via simple thermal stitching
    Kim, Yongtak; Ryu, Ki-Hyun; Na, Wonjin ... Composites. Part B, Engineering, 07/2020, Volume: 193
    Journal Article
    Peer reviewed

    Interest in carbon-fiber-reinforced polymer (CFRP) composites is increasing owing to their excellent mechanical properties, low weight, and good corrosion and fatigue resistance. Generally, CFRPs are ...
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  • Development and field appli... Development and field application of a nonlinear ultrasonic modulation technique for fatigue crack detection without reference data from an intact condition
    Lim, Hyung Jin; Kim, Yongtak; Koo, Gunhee ... Smart materials and structures, 08/2016, Volume: 25, Issue: 9
    Journal Article
    Peer reviewed

    In this study, a fatigue crack detection technique, which detects a fatigue crack without relying on any reference data obtained from the intact condition of a target structure, is developed using ...
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4.
  • A Mode-Switchable Guided El... A Mode-Switchable Guided Elastic Wave Transducer
    Köhler, Bernd; Kim, Yongtak; Chwelatiuk, Konrad ... Journal of nondestructive evaluation, 2020/6, Volume: 39, Issue: 2
    Journal Article
    Peer reviewed
    Open access

    Increasing the safety demands of various progressively complex structures (e.g., in aerospace, automotive engineering, and wind power technology) and the parallel goal of reducing inspection costs ...
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  • Assessment of residual stre... Assessment of residual stresses in railway rails using ultrasonic and Barkhausen noise techniques
    Hwang, Young-In; Lee, Hyosung; Kim, Yongtak ... Research and Review Journal of Nondestructive Testing, 08/2023, Volume: 1, Issue: 1
    Journal Article
    Peer reviewed
    Open access

    Residual stress, a factor affecting the fatigue and fracture characteristics of rails, is formed during the processes of fabrication and heat treatment, and is also generated by shrinkage/tension due ...
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6.
  • Data-driven fatigue crack q... Data-driven fatigue crack quantification and prognosis using nonlinear ultrasonic modulation
    Lim, Hyung Jin; Sohn, Hoon; Kim, Yongtak Mechanical systems and signal processing, 09/2018, Volume: 109
    Journal Article
    Peer reviewed

    •The data-driven crack quantification and prognosis using an ANN is proposed.•Two novel features extracted from the nonlinear ultrasonic modulation are used.•The ANN is optimized using the ...
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  • Nonlinear ultrasonic modula... Nonlinear ultrasonic modulation based failure warning for aluminum plates subject to fatigue loading
    Kim, Yongtak; Lim, Hyung Jin; Sohn, Hoon International journal of fatigue, September 2018, 2018-09-00, 20180901, Volume: 114
    Journal Article
    Peer reviewed

    Display omitted •An online fatigue crack failure warning system is presented.•Nonlinear ultrasonic modulation is used for the real-time failure warning system.•Aluminum specimens with different ...
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8.
  • Simple stitch-assisted carb... Simple stitch-assisted carbon fiber-aluminum laminates via out-of-autoclave process
    Kim, Yongtak; Na, Wonjin; Kim, Minkook ... Journal of reinforced plastics and composites, 12/2023, Volume: 42, Issue: 23-24
    Journal Article
    Peer reviewed

    Fiber–metal laminates (FMLs) are hybrid materials that provide the advantages of both metal and fiber-reinforced polymer composite (FRP) such as improved damage tolerance and impact strength, ...
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