Journal of Northeastern University Natural Science ›› 2020, Vol. 41 ›› Issue (2): 234-240.DOI: 10.12068/j.issn.1005-3026.2020.02.015

• Mechanical Engineering • Previous Articles     Next Articles

Damage Location of Fiber-Reinforced Composites Based on Lumped Mass Approach

LI Hui1,2,3, XU Zhong-hao1,2, WANG Dong-sheng1,2, ZU Xu-dong4   

  1. 1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China; 2. Key Laboratory of Vibration and Control of Aero-Propulsion Systems
  • Received:2019-05-22 Revised:2019-05-22 Online:2020-02-15 Published:2020-03-06
  • Contact: LI Hui
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Abstract: A method for locating the damage of fiber-reinforced composites(FRCs) is studied, which is named as the ‘exponential approximation-lumped mass approach’. Firstly, a lumped mass model is established for a FRCs beam structure. Then, the stiffness matrix of the undamaged beam is obtained by theoretical calculation, and the residual force vector of the beam with damage is determined as the key locating index based on the measured natural frequencies and the regularized modal shape data. Furthermore, a criterion is proposed for approximating the position of damage, so that a set of standard procedures for the damage locating can be determined. Finally, a T300 carbon fiber/resin composite beam with different fiber breakage damages is studied as a case and it is found that the as-proposed damage locating approach can effectively identify the damage positions of the composite beam.

Key words: objective, interval particle, intervallumped mass approach, exponential approximation, fiber-reinforced composite, residual force vector, damage location

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