Multi-mode guided-wave impact damage detection in composite laminates (Conference Presentation)

2020 ◽  
Author(s):  
Robin James ◽  
Hanfei Mei ◽  
Victor Giurgiutiu
Keyword(s):  
Damage Detection ◽  
Composite Laminates ◽  
Impact Damage ◽  
Guided Wave ◽  
Wave Impact ◽  
Multi Mode

Calculation of the Response of a Composite Plate to Localized Dynamic Surface Loads Using a New Wave Number Integral Method

2005 ◽  
Vol 72 (1) ◽  
pp. 18-24 ◽  
Author(s):  
Sauvik Banerjee ◽  
William Prosser ◽  
Ajit Mal
Keyword(s):  
Wave Field ◽  
Composite Laminates ◽  
Impact Damage ◽  
Propagation Distance ◽  
Computational Effort ◽  
Point Load ◽  
Guided Wave ◽  
Wave Number ◽  
Element Analysis ◽  
Dynamic Surface

This study is motivated by the need for an efficient and accurate tool to analyze the wave field produced by localized dynamic sources on the surface or the interior of isotropic plates and anisotropic composite laminates. A semi-analytical method based on the wave number integral representation of the elastodynamic field is described that reduces the overall computational effort significantly over other available methods. This method is used to calculate the guided wave field produced in a thin unidirectional graphite/epoxy composite laminate by a dynamic surface point load. The results are compared with those obtained from a finite element analysis, showing excellent agreement, except for minor differences at higher frequencies. A recently discovered feature of the calculated surface motion, namely, a spatially periodic “phase reversal” of the main pulse with propagation distance, is observed in both cases. The present work is expected to be helpful in developing impact damage monitoring systems in defect-critical structural components through real time analysis of acoustic emission wave forms.

IMPACT DAMAGE DETECTION IN COMPOSITE AEROSPACE STRUCTURES BY MULTI-RESOLUTION NDE INSPECTIONS

2021 ◽  
Author(s):  
MARGHERITA CAPRIOTTI ◽  
ANDREW ELLISON ◽  
HYUNGSUK E. KIM ◽  
FRANCESCO LANZA DI SCALEA ◽  
HYONNY KIM
Keyword(s):  
Damage Detection ◽  
Damage Mechanics ◽  
Complex Geometry ◽  
Impact Damage ◽  
Ct Scanning ◽  
Quantitative Information ◽  
Guided Wave ◽  
Mode Interaction ◽  
Damage State ◽  
Aerospace Structures

Assessing the health of aerospace structures and understanding the underlying mechanics that govern composite strength constitute a main focus of research in the area of aerospace design and airworthiness certification. Impact damage is one of the major threats to composite aerospace structures for its frequency of occurrence, complexity and minimum external visibility. While non-destructive evaluation (NDE) provides a variety of solutions to inspect the subsurface and internal components of structures non-invasively, a gap exists between the mechanics of damage formation, growth and tolerance, and the inspectability of the structure. This study is focused on the quantitative correlation between impact damage mechanics and ultrasonic NDE inspections, where damage severity, mode interaction and progression are identified in real-scale composite panels of complex geometry, representative of commercial aircraft, impacted to reproduce different damage types at the skin-to-stringer interface and the stringer cap. High resolution X-ray CT scanning and conventional ultrasonic scanning (UT) have been used to map the damage state and identify relevant impact damage features. Ultrasonic guided wave (UGW) scanning was then employed as a rapid in-situ inspection technique to not only detect damage but also provide quantitative information about damage severity and mode. The correlation of multi-resolution multi-dimensional NDE data promises new insights on damage studies and solutions to damage detection and prognosis through viable NDE inspections.

Impact damage detection in composites using a guided wave mixing technique

2019 ◽  
Vol 31 (1) ◽  
pp. 014001 ◽  
Author(s):  
Weibin Li ◽  
Yaru Xu ◽  
Ning Hu ◽  
Mingxi Deng
Keyword(s):  
Damage Detection ◽  
Impact Damage ◽  
Guided Wave ◽  
Wave Mixing

Modelling Anisotropy Influence on Guided Wave Scattering at Composite Delaminations

2021 ◽  
Author(s):  
Flora Hervin ◽  
Paul Fromme
Keyword(s):  
Composite Laminates ◽  
Guided Waves ◽  
Impact Damage ◽  
Scattered Wave ◽  
Unidirectional Composite ◽  
Guided Wave ◽  
Parameter Study ◽  
Laser Vibrometer ◽  
Composite Panels ◽  
Isotropic Composite

Abstract Carbon fibre reinforced composite laminates are widely used in aerospace structures but are prone to barely visible impact damage (BVID). Depending on impact severity, delaminations can form below the surface of the laminate, reducing the load bearing capacity. Efficient structural health monitoring (SHM) of composite panels can be achieved using guided waves propagating along the structure. Propagation and scattering of the A0 Lamb wave mode in a quasi-isotropic composite laminate was modelled using full three-dimensional (3D) Finite Element (FE) simulations. Individual ply layers were modelled using homogeneous unidirectional composite material properties to accurately capture the anisotropy effects. FE predictions for scattering and energy trapping at delaminations were compared to experimental measurements. Noncontact, full-wavefield guided wave measurements were obtained using a laser vibrometer. Good agreement was found between experiments and FE predictions. The effect of delamination shape and depth was investigated through a numerical parameter study. The angular dependency of the amplitude of the scattered wave was calculated. The influence of ply layer anisotropy on wave propagation in an undamaged laminate was investigated numerically. The sensitivity of guided waves for the detection of delaminations due to barely visible impact damage (BVID) in composite panels has been verified.

Guided Wave Based Damage Detection in a Composite Plate with an Opening

2018 ◽  
Vol 774 ◽  
pp. 638-643
Author(s):  
Neo Gao Ming ◽  
Zahra Sharif Khodaei
Keyword(s):  
Damage Detection ◽  
Composite Plate ◽  
Impact Damage ◽  
Guided Wave ◽  
Sensor Data ◽  
Selection Strategy ◽  
Coverage Area ◽  
Damage Area ◽  
Drop Mass ◽  
The One

This work reports on damage detection in a composite plate with an opening. A composite plate with an opening is manufactured and sensorized to investigate the effect of the opening on the wave propagation as well as the reliability of the delay and sum damage detection method in the presence of the opening. The plate was then impacted with a drop mass to cause barely visible impact damage and sensor data are gathered to analyze the diagnosis. The results show that if all the sensors around the opening is used, even though damage can be detected, it cannot be localized accurately. Further investigation shows that by localizing the sensor network to the one close to the damage area (multi-level detection), damage can be both detected and localized reliably. The results of the detection are also compared with the maximum coverage area map to validate the optimal sensor selection strategy.

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