IR thermographic characterization of low energy impact damage in carbon/carbon composite by applying optical and ultrasonic stimulation

2014 ◽  
Author(s):  
V. P. Vavilov ◽  
A. O. Chulkov ◽  
D. A. Derusova
Keyword(s):  
Impact Damage ◽  
Carbon Composite ◽  
Low Energy ◽  
Energy Impact ◽  
Ultrasonic Stimulation

Studying Stability of CFRP Composites to Low-Energy Impact Damage by Laser Vibrometry

2019 ◽  
Vol 55 (9) ◽  
pp. 639-647
Author(s):  
V. Yu. Shpil’noi ◽  
V. P. Vavilov ◽  
D. A. Derusova ◽  
V. A. Krasnoveikin
Keyword(s):  
Impact Damage ◽  
Low Energy ◽  
Laser Vibrometry ◽  
Energy Impact ◽  
Cfrp Composites

Evaluation of repeated low energy impact damage in carbon–epoxy composite materials

2005 ◽  
Vol 67 (3) ◽  
pp. 307-315 ◽  
Author(s):  
W.A. de Morais ◽  
S.N. Monteiro ◽  
J.R.M. d'Almeida
Keyword(s):  
Composite Materials ◽  
Epoxy Composite ◽  
Impact Damage ◽  
Low Energy ◽  
Energy Impact

A universal NDT method for examination of low energy impact damage in CFRP with the use of TLC film

2018 ◽  
Vol 33 (3) ◽  
pp. 315-328 ◽  
Author(s):  
G. Strugała ◽  
M. Klugmann ◽  
M. Landowski ◽  
M. Szkodo ◽  
D. Mikielewicz
Keyword(s):  
Impact Damage ◽  
Low Energy ◽  
Energy Impact

Low Energy Impact Damage Modes in Aluminum Foam and Polymer Foam Sandwich Structures

2006 ◽  
Vol 8 (5) ◽  
pp. 365-379 ◽  
Author(s):  
Paul Compston ◽  
Millicent Styles ◽  
Shankar Kalyanasundaram
Keyword(s):  
Aluminum Foam ◽  
Sandwich Structures ◽  
Impact Damage ◽  
Low Energy ◽  
Polymer Foam ◽  
Energy Impact

Quantitative Detection of Low Energy Impact Damage in a Sandwich Composite UAV Wing

2008 ◽  
Author(s):  
Engin Aktas ◽  
Mark Seaver ◽  
Jonathan M. Nichols ◽  
Stephen T. Trickey
Keyword(s):  
Impact Damage ◽  
Vibrational Excitation ◽  
Gaussian White Noise ◽  
Low Energy ◽  
Sandwich Composite ◽  
Quantitative Detection ◽  
Foam Core ◽  
Vibrational Response ◽  
Energy Impact ◽  
Deposited Energy

This work describes damage detection efforts applied to a foam core composite wing following a series of low energy impacts in adjacent locations. The wing is a sandwich composite, composed of 4 layers of woven carbon fiber fabric surrounding a short aluminum core in the center (where it’s connected to the fuselage) and a foam core for the outer portions of the wing. The wing measures 1320 mm. × 152.4 mm. × 13.4 mm and has an airfoil cross-section. Thirteen impacts (6 – 8 J deposited energy) were applied at adjacent locations approximately 1/3 of the way out from the center. Following one or two impacts, the wing was tested using static tip deflection and dynamic vibrational excitation. Static and dynamic strains were measured using 8 fiber Bragg grating (FBG) sensors. Dynamic acceleration was also monitored using 3 conventional accelerometers. Dynamic excitation included the output of a Lorenz oscillator (0 – ∼150 Hz), simulated gust loading (0 – 150 Hz), and Gaussian white noise (0 – 1500 Hz). The analysis is a quantitative assessment of response nonlinearity based on the assumption that the undamaged wing behaves linearly and that the damage introduces nonlinearity into the vibrational response.

Low Energy Impact Damage Detection in Laminar Thermoplastic Composite Materials by Means of Embedded Optical Fibers

2005 ◽  
Vol 494 ◽  
pp. 481-486
Author(s):  
A. Kojović ◽  
I. Živković ◽  
Lj. Brajović ◽  
D. Mitraković ◽  
R. Aleksić
Keyword(s):  
Composite Materials ◽  
Optical Fibers ◽  
Impact Damage ◽  
Charpy Impact ◽  
Optical Signal ◽  
Low Energy ◽  
Thermoplastic Composite ◽  
Woven Fabric ◽  
Energy Impact ◽  
The Impact

The possibility of applying optical fibers as sensors for investigation of real time low energy impact damage in laminar thermoplastic composite materials has been studied. For that purpose intensity based optical fibers were embedded in composite material specimens. Kevlar 129 (DuPont’s registered trade-mark for poly (p-phenylene terephthalamide)) woven fabric was used as reinforcement. Impact toughness testing by the Charpy impact pendulum was conducted in order to investigate low energy impacts. Transient intensity of optical signal during the impact, were compared with material crack initiation energy and crack propagation energy. Following this approach, development of damage in material was monitored. Obtained results show that intensity based optical fibers could be used as detectors for material damage appearance, and also, for level evaluation of its degradation caused by low energy impacts.

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