Search Results - "Barnard, Daniel J."

Determination of acoustic nonlinearity parameter (β) using nonlinear resonance ultrasound spectroscopy: Theory and experiment by Chakrapani, Sunil Kishore, Barnard, Daniel J.

“…The present article investigates the possibility of using nonlinear resonance ultrasound spectroscopy to determine the acoustic nonlinearity parameter (β) and…”
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Fabrication and comparison of PMN-PT single crystal, PZT and PZT-based 1-3 composite ultrasonic transducers for NDE applications by Kim, Ki-Bok, Hsu, David K., Ahn, Bongyoung, Kim, Young-Gil, Barnard, Daniel J.

“…This paper describes fabrication and comparison of PMN-PT single crystal, PZT, and PZT-based 1-3 composite ultrasonic transducers for NDE applications. As a…”
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Exploring barriers of m-commerce adoption in SMEs in the UK: Developing a framework using ISM by Rana, Nripendra P., Barnard, Daniel J., Baabdullah, Abdullah M.A., Rees, Daniel, Roderick, Sian

“…•The concept of m-commerce has grown exponentially within business in the last decade.•The paper aims to understand barriers of m-commerce adoption in SMEs in…”
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Nonlinear forced vibration of carbon fiber/epoxy prepreg composite beams: Theory and experiment by Chakrapani, Sunil Kishore, Barnard, Daniel J., Dayal, Vinay

“…In the present work, a nonlinear forced vibration model for fiber reinforced composites was developed with varying fiber orientations and laminate sequences. A…”
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A Calibration Technique for Ultrasonic Immersion Transducers and Challenges in Moving Towards Immersion Based Harmonic Imaging by Chakrapani, Sunil Kishore, Barnard, Daniel J.

“…The present article describes the calibration of ultrasonic immersion transducers using reciprocity technique. A step-by-step procedure and instrumentation…”
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Terahertz Wave Approach and Application on FRP Composites by Im, Kwang-Hee, Hsu, David K., Chiou, Chien-Ping, Barnard, Daniel J., Jung, Jong-An, Yang, In-Young

“…Terahertz (THz) applications have emerged as one of the most new powerful nondestructive evaluation (NDE) techniques. A new T-ray time-domain spectroscopy…”
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Nonlinear Ultrasonic Inspection of the Effect of Contaminants on Material Properties of Epoxy-Adhesive by Pyun, Do-Kyung, Koester, Lucas W., Barnard, Daniel J., Bond, Leonard J.

“…Adhesive joints have been an effective alternative to conventional mechanical fasteners for joining materials in the aerospace and automotive industries…”
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Influence of Terahertz Waves on Unidirectional Carbon Fibers in CFRP Composite Materials by IM, Kwang-Hee, HSU, David Kuei, CHIOU, Chien-Ping, BARNARD, Daniel J., KIM, Sun-Kyu, KANG, Sung-Jun, CHO, Young-Tae, JUNG, Jong-An, YANG, In-Young

“…Terahertz time domain spectroscopy (THz TDS) system based on the reflective and through-transmission modes was utilized. Influence of terahertz waves (T-ray)…”
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Influence of laminate sequence and fabric type on the inherent acoustic nonlinearity in carbon fiber reinforced composites by Chakrapani, Sunil Kishore, Barnard, Daniel J., Dayal, Vinay

“…This paper presents the study of influence of laminate sequence and fabric type on the baseline acoustic nonlinearity of fiber-reinforced composites. Nonlinear…”
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Influence of fiber orientation on the inherent acoustic nonlinearity in carbon fiber reinforced composites by Chakrapani, Sunil Kishore, Barnard, Daniel J, Dayal, Vinay

“…This paper presents the study of non-classical nonlinear response of fiber-reinforced composites. Nonlinear elastic wave methods such as nonlinear resonant…”
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A mechanical-dielectric-high frequency acoustic sensor fusion for soil physical characterization by Naderi-Boldaji, Mojtaba, Tekeste, Mehari Z., Nordstorm, Richard A., Barnard, Daniel J., Birrell, Stuart J.

“…•A novel sensor fusion for soil physical characterization.•Combination of high-frequency acoustic sensor with dielectric cone penetrometer.•Promising soil…”
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Estimation of porosity content of composite materials by applying discrete wavelet transform to ultrasonic backscattered signal by Kim, Ki-Bok, Hsu, David K., Barnard, Daniel J.

“…As the use of composite materials in the aerospace industry increases, the development of advanced nondestructive evaluation (NDE) techniques for composite…”
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Viscous material-filled synthetic defects for vibrothermography by Renshaw, Jeremy, Holland, Stephen D., Barnard, Daniel J.

“…This paper describes a method to create viscous material-filled (VMF) synthetic defects for vibrothermography that, like cracks, delaminations, or disbonds,…”
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Internal defect detection and characterization of samarium-cobalt sintered magnets by ultrasonic testing technique by Cui, Baozhi, Cui, Jun, Barnard, Daniel J., Bond, Leonard J.

“…•Excessive Sm-Co magnet material is being scrapped due to a lack of understanding of internal defects.•We report an ultrasonic testing (UT) technique for…”
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Fatigue damage evaluation of carbon fiber reinforced composites using nonlinear resonance spectroscopy by Chakrapani, Sunil Kishore, Barnard, Daniel J.

“…The present work explores the use of nonlinear resonance spectroscopy to detect early fatigue damage in carbon fiber-epoxy composite laminates. The objective…”
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Inversion of acoustic nonlinearity parameter (beta) from nonlinear resonance ultrasound spectroscopy measurements by Chakrapani, Sunil Kishore, Barnard, Daniel J.

“…The acoustic nonlinearity parameter (beta) is well known to be sensitive to lattice parameters and defects. There are several techniques which can measure this…”
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Variation of nonlinearity parameter at low fundamental amplitudes by Barnard, Daniel J.

“…Recent harmonic generation measurements of the nonlinearity parameter β in polycrystalline Cu–Al alloys have shown a transition to lower values at low…”
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