Characterization of fatigue damage in long fiber epoxy composite laminates

Giancane, S.; Panella, F.W.; Dattoma, V.

doi:10.1016/j.ijfatigue.2009.02.024

Cited by 50 publications

(23 citation statements)

References 22 publications

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“…Fatigue loading typically leads to the initiation, progression and accumulation of micro defects. At the macroscopic level, these defects manifest themselves in a directional reduction of the stiffness properties [31,32]. Such a directional stiffness reduction is visible as a stretching (along the direction of loading) of the UPS contours.…”

Section: Fatigue Damagementioning

confidence: 99%

The Ultrasonic Polar Scan for Composite Characterization and Damage Assessment: Past, Present and Future

et al. 2016

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Abstract:In the early 1980's, the ultrasonic polar scan (UPS) technique was developed to assess the fiber direction of composites in a nondestructive way. In spite of the recognition by several researchers as being a sophisticated and promising methodology for nondestructive testing (NDT) and materials science, little advance was made during the following 30 years. Recently however, the UPS technique experienced a strong revival and various modifications to the original UPS setup have been successfully implemented. This revival has exposed several powerful capabilities and interesting applications of the UPS technique for material characterization and damage assessment. This paper gives a short historical overview of the UPS technique for characterizing and inspecting (damaged) fiber-reinforced plastics. In addition, a few future research lines are given, which will further expand the applicability and potential of the UPS method to a broader range of (damaged) materials, bringing the UPS technique to the next level of maturity.

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Section: Fatigue Damagementioning

confidence: 99%

The Ultrasonic Polar Scan for Composite Characterization and Damage Assessment: Past, Present and Future

et al. 2016

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“…Fatigue damage in the process of defect evolution is irreversible, which deteriorates that the material properties grow progressively toward a critical condition when damage occurs [12][13][14][15]. Take fiber-matrix debonding as an example, in the case of the fatigue loading of matrix-dominated composites, fiber pull-out and matrix cracking generate a significant amount of heat, which causes temperature increments even when the stresses are well below the high cycle fatigue strength of the material [16].…”

Section: Introductionmentioning

confidence: 99%

A Quantitative Study on the Void Defects Evolving into Damage in Wind Turbine Blade Based on Internal Energy Storage

Zhou

et al. 2020

Applied Sciences

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As manufacturing defects, voids in wind turbine blades may cause damage under fatigue loads. In this paper, the internal energy storage is used as an indicator to identify the critical moment when a defect evolves into damage. The heat transfer equation of composites material containing void defects is derived based upon the theory of the thermodynamics of irreversible processes. In order to obtain the numerical calculation model of the internal energy storage of the evolving process, the thermal conductivity along the transverse direction is homogenized as the temperature date along this direction is acquired by a thermal camera. Specimens with different void fractions are tested with infrared thermal imaging under fatigue load, during which the stress, strain and temperature data are acquired to establish the curve of internal energy storage against the fatigue cycle. This relationship curve can be used to identify the critical moment when void defects evolve into damage. The feasibility of this method is proven by microscopic observation.

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“…However, the application of the P-UPS technique for nondestructive detection and evaluation of fatigue damage in fiber-reinforced plastics has hardly been investigated. Most fiber-reinforced composites show a progressive directional reduction in stiffness properties upon fatigue loading through fiber/matrix interface debonding, matrix cracks, fiber bridging/pull-out/failure on the micro-scale [21,22,25,27]. There where most of the existing NDT tools fail to assess the effect of fatigue damage in composites, the nature and design of the P-UPS method should perfectly match such kind of material degradation.…”

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confidence: 99%

Damage Signature of Fatigued Fabric Reinforced Plastics in the Pulsed Ultrasonic Polar Scan

et al. 2014

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This study investigates the use of both the amplitude and time-of-flight based pulsed ultrasonic polar scan (P-UPS) for the nondestructive detection and evaluation of fatigue damage in fabric reinforced composites. Several thermoplastic carbon fabric reinforced PPS specimens (CETEX), loaded under various fatigue conditions, have been scanned at multiple material spots according to the P-UPS technique in order to extract material degradation in a quantitative way. The P-UPS results indicate that shear dominated fatigued carbon/PPS goes with a reduction of shear properties combined with large fiber distortions. The P-UPS results of the tension-tension fatigued carbon/PPS samples on the other hand reveal a directional degradation of the stiffness properties, reaching a maximum reduction of −12.8 % along the loading direction. The P-UPS extracted damage characteristics are fully supported by simulations, conventional destructive tests as well as visual inspection. The results demonstrate the excellent capability of the P-UPS method for nondestructively assessing and quantifying both shear-dominated and tension-tension fatigue damage in fabric reinforced plastics.

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Characterization of fatigue damage in long fiber epoxy composite laminates

Cited by 50 publications

References 22 publications

The Ultrasonic Polar Scan for Composite Characterization and Damage Assessment: Past, Present and Future

The Ultrasonic Polar Scan for Composite Characterization and Damage Assessment: Past, Present and Future

A Quantitative Study on the Void Defects Evolving into Damage in Wind Turbine Blade Based on Internal Energy Storage

Damage Signature of Fatigued Fabric Reinforced Plastics in the Pulsed Ultrasonic Polar Scan

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