Quantitative analysis of QSI and LVI damage in GFRP unidirectional composite laminates by a new ultrasonic approach

Castellano, Anna; Fraddosio, Aguinaldo; Piccioni, Mario Daniele

doi:10.1016/j.compositesb.2018.06.003

Cited by 51 publications

(20 citation statements)

References 31 publications

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“…Two in-situ non-destructive techniques are used in order to detail the fatigue damage scenario: namely, acoustic emission (AE) and infrared (IR) thermography. These techniques have become recognized non-destructive techniques, commonly used to detect, locate and discriminate defects in traditional composite materials [29][30][31][32][33] as well as PFCs [5,34,35]. AE are transient elastic waves produced by the sudden internal stress redistribution of the materials caused by the changes within the structure.…”

Section: Introductionmentioning

confidence: 99%

About the fatigue endurance of unidirectional flax-epoxy composite laminates

Jeannin

Gabrion

Ramasso

et al. 2019

Composites Part B: Engineering

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Even if the knowledge on the fatigue behaviour of plant fibre composites has increased steadily in the last few years, some issues still remain open at the present time. Such is the case, for instance, of the high-cycle fatigue strength. Actually, most of the fatigue studies available in the open literature to date are limited to a maximum of 1-2 million cycles. All available stress-life plots exhibit linear trends with constant slope and does not reveal any fatigue limit for these given cycle numbers. So, this paper proposes to investigate the High-Cycle Fatigue behaviour of a flax-epoxy laminated composite. The effect of loading frequency is firstly evaluated on the Low-Cycle Fatigue behaviour using a multi-instrumented analysis including infrared thermography and acoustic emission. Results show that high frequency could be a suitable method to shorten the fatigue tests and study the High Cycle Fatigue behaviour of this type of composite material. Based on this result, high-frequency (30 Hz) is used to investigate the behaviour of the flax-epoxy composite on a range of 10 6-10 8 cycles. Results show that fatigue damage continues to evolve and the maximum stress continues to decrease as a function of increasing number of cycles, following a power-law trend. This result suggests that, if a fatigue limit does exist for unidirectional flax-epoxy composite laminates, it is so low that it cannot observed in tests up to 10 8 cycles. It is also recommended to take it into consideration when designing plant fibre composite structures.

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Section: Introductionmentioning

confidence: 99%

About the fatigue endurance of unidirectional flax-epoxy composite laminates

Jeannin

Gabrion

Ramasso

et al. 2019

Composites Part B: Engineering

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“…In the aerospace industry, unidirectional pultruded glass fiber-reinforced plastic (GFRP) composites demonstrating high stiffness in one direction are used in parts such as spar caps, panel stiffeners, and longerons [ 4 ]. When such GFPR composites are exposed to bird strikes, hailstorms, etc., some researchers studied the effect of impact-type defects in composites [ 5 , 6 , 7 , 8 ]; to summarize, the size and shape of these defects can vary depending on the orientation of the glass fiber matrix and the ratio of glass fiber to volume matrix which can lead to micro fiber cracking, delamination, internal matrix fiber cracking etc. In such cases, the severity of the damage cannot be accessed visually and, in order to inspect such impact-type defects, nondestructive testing needs to be used.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Ultrasonic Non-Contact Air-Coupled Techniques for Characterization of Impact-Type Defects in Pultruded GFRP Composites

et al. 2021

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This article compares different air-coupled ultrasonic testing methods to characterize impact-type defects in a pultruded quasi-isotropic glass fiber-reinforced plastic (GFRP) composite plate. Using the air-coupled transducers, comparisons among three methods were performed, namely, bulk-wave through transmission, single-side access using guided waves, and ultrasonic-guided wave tomography. The air coupled through transmission technique can determine the size and shape of impact-type defects with a higher resolution, but with the consequence of time consumption and, more importantly, the necessity of access to both sides of the sample. The guided wave technique on the other hand, allows a single-side inspection and is relatively fast. It can be used to determine the size of the defect using ultrasonic B-scan, but the exact shape of the defect will be compromised. Thus, in this article, to determine the shape of the defect, application of the parallel beam tomographic reconstruction technique using guided Lamb waves is demonstrated. Furthermore, a numerical finite element simulation was performed to study the effects of guided wave propagation in the composite sample and interaction with the internal defect. Lastly, the results from the experiments of different techniques were compared according to possibilities of defect sizing and determination of its shape.

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“…Several ultrasonic techniques have been used for inspection and characterization of composite materials. Castellano et. al.…”

Section: Introductionmentioning

confidence: 99%

“…al. (2018) introduced a new experimental approach for the comparison between Quasi Static Indentation (QSI) damage and Low-Velocity Impact (LVI) damage in polymer composites starting from the results of ultrasonic goniometric immersion tests [16]. In their study, the differences and similarities between QSI and LVI damage starting from the analysis of the variations of the acoustic behavior and by using a suitable anisotropic damage model developed in the framework of the Continuum Damage Mechanics theory [16].…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Ultrasonic Inspection of Composite Materials: A Comparative Advantage of Phased Array Ultrasonic

2019

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Carbon- and glass fiber-reinforced polymer (CFRP and GFRP) composite materials have been used in many industries such as aerospace and automobile because of their outstanding strength-to-weight ratio and corrosion resistance. The quality of these materials is important for safe operation. Nondestructive testing (NDT) techniques are an effective way to inspect these composites. While ultrasonic NDT has previously been used for inspection of composites, conventional ultrasonic NDT, using single element transducers, has limitations such as high attenuation and low signal-to-noise ratio (SNR). Using phased array ultrasonic testing (PAUT) techniques, signals can be generated at desired distances and angles. These capabilities provide promising results for composites where the anisotropic structure makes signal evaluation challenging. Defect detection in composites based on bulk and guided waves are studied. The capability of the PAUT and its sensitivity to flaws were evaluated by comparing the signal characteristics to the conventional method. The results show that flaw sizes as small as 0.8 mm with penetration depth up to 25 mm can be detected using PAUT, and the result signals have better characteristics than the conventional ultrasonic technique. In addition, it has been shown that guided wave generated by PAUT also has outstanding capability of flaw detection in composite materials.

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Quantitative analysis of QSI and LVI damage in GFRP unidirectional composite laminates by a new ultrasonic approach

Cited by 51 publications

References 31 publications

About the fatigue endurance of unidirectional flax-epoxy composite laminates

About the fatigue endurance of unidirectional flax-epoxy composite laminates

Comparison of Ultrasonic Non-Contact Air-Coupled Techniques for Characterization of Impact-Type Defects in Pultruded GFRP Composites

Nondestructive Ultrasonic Inspection of Composite Materials: A Comparative Advantage of Phased Array Ultrasonic

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