Abstract
A Finite Element based numerical model for a vibration based damage identification method for a thin-walled slender composite structure is discussed in this chapter. The linear dynamic response of an intact and a locally delaminated 16-layer unidirectional carbon fibre PEKK reinforced T-beam is analysed. The capabilities of the modal strain energy damage index algorithm to detect and localize a delamination is assessed. Both bending and torsion modes of the structure are used in the algorithm. Both an experimental set-up and a numerical model are discussed. Measurements are performed on an intact and an artificially delaminated structure, using a laser-vibro measuring system to determine the response to a force excitation. A commercially available Finite Element package is employed for the numerical model. The aim of the numerical model is to perform a parametric study. The study is preceded by an experimental verification of the numerical model. Subsequently, it is used to analyse the effect of the size and location of a delamination, as well as the number of data points employed, on the damage index.
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Notes
- 1.
Damage propagation is not accounted for, as the time scale of damage propagation must be significantly smaller than the time scale of the vibration. If not, the damage detection will coincide with actual failure of the structure.
Abbreviations
- E :
-
modulus of elasticity [N m−2]
- f :
-
fraction [–]
- F :
-
fractional strain energy [–]
- F N :
-
natural frequency [Hz]
- G :
-
shear modulus [N m−2]
- H :
-
height of stiffener [m]
- i,j :
-
indices
- I :
-
2nd moment of inertia [m4]
- J :
-
rotational moment of inertia [m4]
- l :
-
length [m]
- L d :
-
length of delamination [m]
- L s :
-
start of delamination [m]
- L T :
-
total length [m]
- M :
-
momentum [N m]
- n :
-
natural mode index [–]
- N :
-
total number [–]
- s :
-
location of data lines [m]
- T :
-
torque [N m]
- u :
-
displacement [m]
- U :
-
strain energy [N m]
- W 1 :
-
skin flange width [m]
- W 2 :
-
distance to data lines [m]
- x,y,z :
-
cartesian coordinates
- B:
-
bending mode related value
- T:
-
torsion mode related value
- thrs:
-
threshold value
- α :
-
damage severity [–]
- β :
-
damage index [–]
- ε :
-
relative error [%]
- ε max :
-
maximum relative error [%]
- ζ:
-
damping [N s m−1]
- θ :
-
angle [rad]
- ν :
-
Poisson’s ratio [–]
- ρ :
-
volumetric density [kg m−3]
- | |:
-
absolute value
- \(\bar{\,}\) :
-
mean value
- \(\tilde{\,}\) :
-
damaged variant of parameter/variable
- ∂ :
-
partial derivative
- d:
-
derivative/infinitesimal part
- Σ:
-
summation
- EMA:
-
Experimental modal analysis
- FBG:
-
Fibre bragg grating
- FRF:
-
Frequency response function
- MSE-DI:
-
Modal strain energy damage identification
- PEKK:
-
PolyEhterKatoneKatone
- SHM:
-
Structural health monitoring
- TRL:
-
Technology readiness level
- VB:
-
Vibration based
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Loendersloot, R., Ooijevaar, T.H., Warnet, L., de Boer, A., Akkerman, R. (2011). Vibration Based Structural Health Monitoring and the Modal Strain Energy Damage Index Algorithm Applied to a Composite T-Beam. In: Vasques, C., Dias Rodrigues, J. (eds) Vibration and Structural Acoustics Analysis. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1703-9_6
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