Nondestructive damage assessment in fiber reinforced composites with the pulsed ultrasonic polar scan

Kersemans, Mathias; Baere, Ives De; Degrieck, Joris; Abeele, Koen Van Den; Pyl, Lincy; Zastavnik, Filip; Sol, Hugo; Paepegem, Wim Van

doi:10.1016/j.polymertesting.2014.01.001

Cited by 41 publications

(32 citation statements)

References 29 publications

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“…After loading in shear, the overlap angle reduced to ζ = 81.5° (see Figure 6b), which thus reveals a distortion of the fiber orientation of 10°. The evolution of the overlap angle ζ has been monitored for a range of shear load levels, and we found a clear relation between the applied shear load level and the observed fiber distortion [16]. …”

Section: Static Damagementioning

confidence: 79%

Recent Advances in the Ultrasonic Polar Scan Method for Characterizing (Degraded) Fiber Reinforced Plastics

Kersemans¹,

Martens²,

Paepegem³

et al. 2015

Structural Health Monitoring 2015

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Section: Static Damagementioning

confidence: 79%

Recent Advances in the Ultrasonic Polar Scan Method for Characterizing (Degraded) Fiber Reinforced Plastics

Kersemans¹,

Martens²,

Paepegem³

et al. 2015

Structural Health Monitoring 2015

Self Cite

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“…The importance of this case cannot be underestimated as in practical and realistic applications the fiber direction is often unknown. This is especially true for composite materials which show a distortion of the fiber orientation as a consequence of mechanical loading, potentially resulting in a shift of the main symmetry axes [11,12]. Figure 8c shows a TOF P-UPS simulation of a [0 • ] 8 C/E composite plate at f c d = 5 MHz.mm, for a random orientation of the main symmetry axes.…”

Section: Case Study Ii: Inversion Results For An Orthotropicmentioning

confidence: 99%

“…In reality, however, the symmetry of the composite sample under investigation, and especially the orientation of its main axes of symmetry, is often unknown a priori. Moreover, when the symmetry orientation of the investigated composite is well defined for an intact sample, mechanical loading during operation could induce a substantial change in fiber direction [11,12]. An approach that uses a consecutive treatment of single scan data at fixed individual azimuthal φ-angles therefore lacks the versatility of acquiring and analyzing the required information in samples of arbitrary symmetry.…”

Section: Introductionmentioning

confidence: 99%

“…A typical experiment records and analyzes signals at 1 million incidence angles and takes about 10 minutes. In this paper, we concentrate on the information contained in the TOF polar scans, in which the TOF is defined as the arrival time associated with the maximum amplitude of the transmitted pulse [11]. The stretched views of the P-UPS images in orthogonal directions are a direct consequence of the unidirectional fiber reinforcement of the investigated [0 • ] 8 C/E composite.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of the Time-of-Flight Pulsed Ultrasonic Polar Scan for the determination of the full elasticity tensor of orthotropic plates

Martens

Kersemans

Daemen

et al. 2017

Composite Structures

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A novel approach is presented for the ultrasonic determination of the elastic constants in plate-like structures of an orthotropic material (e.g. composites) using a time-of-flight version of the pulsed ultrasonic polar scan (TOF P-UPS). A forward numerical model of the TOF P-UPS is coupled to an inversion algorithm, based on the genetic optimization principle, targeting the determination of the orthotropic elastic parameters, and the quality of the inversion is demonstrated for synthetic data representative for composites. The advantage of the new approach is that the presented TOF P-UPS inversion method does not require a priori knowledge about the symmetry class of the material, nor about the orientation of the main axes of symmetry. Furthermore, the TOF P-UPS inversion method yields an accurate characterization of the orthotropic elasticity tensor, even when applied to composite plates with small frequency-thickness ratios in which the traditional bulk wave approaches no longer hold. Finally, the robustness of the TOF P-UPS inversion method is demonstrated for noisy data by evaluating the results for a range of signal-to-noise ratios.

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“…However, to simplify the calculations, we have found and verified [6] that it is equally adequate to define the TOF as the difference in time of the maximum transmitted and incident peak (eq. (3)).…”

Section: Tof Determination For Platesmentioning

confidence: 99%

Time-Of-Flight recorded Pulsed Ultrasonic Polar Scan for elasticity characterization of composites

Martens¹,

Kersemans²,

Degrieck³

et al. 2015

Emerging Technologies in Non-Destructive Testing VI

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In its orginal configuration, the pulsed ultasonic polarscan (P-UPS) mainly focussed on elastic material characterization through the inversion of amplitude landscape measurements. However, for several materials, special attention is required as minima in the transmission amplitudes do not exactly coincide with critical angles calculated from the Christoffel equations. Consequently, other means to extract the information on elastic moduli from P-UPS measurements are being investigated. In the present paper, we report on the use of time-of-flight ultrasonic polarscan (TOF-UPS) simulations as a new means of material characterization. Previous TOF inversions, although successful, were based on bulk wave approximations, which are not longer valid for thin materials. Our first inversion results on numerical cases demonstrate the usefulness of the new developed technique and highlight the added value compared to the bulk wave approximation 1 INTRODUCTION

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Nondestructive damage assessment in fiber reinforced composites with the pulsed ultrasonic polar scan

Cited by 41 publications

References 29 publications

Recent Advances in the Ultrasonic Polar Scan Method for Characterizing (Degraded) Fiber Reinforced Plastics

Recent Advances in the Ultrasonic Polar Scan Method for Characterizing (Degraded) Fiber Reinforced Plastics

Numerical study of the Time-of-Flight Pulsed Ultrasonic Polar Scan for the determination of the full elasticity tensor of orthotropic plates

Time-Of-Flight recorded Pulsed Ultrasonic Polar Scan for elasticity characterization of composites

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