NDT Technology

NDT Technology

Effect of Orders of Scattering in Linear Grating of Fibrous Reinforced Composites Using Resonance Ultrasonic Spectroscopy

Document Type : Original Article

Authors
Ehsan Hossein Zadeh Khezri
Sina Sodagar
Department of Mechanical Engineering, Petroleum University of Technology
10.30494/jndt.2021.277493.1070
Abstract
In this paper, resonance ultrasonic spectroscopy is employed to evaluate a linear grating of fibrous composite materials. The ultrasonic longitudinal wave scattering from the embedded linear grating in an elastic matrix is simulated using finite element method. To involve the frequency effects of the measurement system, the modified short-pulse method of isolation and identification of resonances (MIIR) is employed to calculate the resonance modes and frequencies of the elastic fibers. The conformity conditions of the obtained results from analytical methods and the short pulse MIIR method are then investigated, including various orders of scattering. The FE-based resonance ultrasonic spectroscopy method is employed to investigate the behavior of the backscattered resonance spectrum for a linear grating of two fibers embedded in an epoxy matrix and evaluate the effects of grating structure and measurement system. The obtained results show that, due to the second-order of scattering, variation of the transducer position with respect to the linear grating of fibers can shift the detected resonance frequencies.
Keywords
fibrous composite material
linear array
ultrasonic waves
resonance ultrasonic spectroscopy
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  • Receive Date 15 March 2021
  • Revise Date 20 May 2021
  • Accept Date 11 November 2021