Damaged composite laminates: Assessment of residual Young's modulus through the Impulse Excitation Technique

Paolino, Davide Salvatore; Geng, Hanze; Scattina, Alessandro; Tridello, Andrea; Cavatorta, Maria Pia; Belingardi, Giovanni

doi:10.1016/j.compositesb.2017.07.008

Cited by 24 publications

(17 citation statements)

References 16 publications

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“…Experimental tests are performed on a structural composite laminate specifically developed for automotive application. The composite material is the same adopted by Tridello et al in their investigations [15] and previously in [9]. It consists of a matrix made of epoxy resin reinforced by eight layers of twill woven carbon fabric.…”

Section: Methodsmentioning

confidence: 99%

“…Even though the first layer is different from the other seven, this difference can be neglected when considering the global mechanical behavior of the laminate. The measured elastic properties (Young's modulus, shear modulus, and Poisson's ratio) are reported in Table 1, as assessed in [9]. Given the symmetry of the woven fabric, the mechanical properties and the Poisson's ratios in the in-plane direction 1 and 2 are the same (i.e.…”

Section: Methodsmentioning

confidence: 99%

“…Further, methods based on ultrasounds and vibrational analysis are usually adopted for globally analyzing the dynamic response of a structure [6]. In particular, the use of the Impulse Excitation Technique (IET), which is regulated by ASTM Standards for metallic materials [7,8], has been recently extended to composite specimens [9]. However, local damages and defects are still revealed with difficulty in real-world structures since the presence of anomalies is mitigated by the global response of the system.…”

Section: Of 14mentioning

confidence: 99%

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Assessment of Residual Elastic Properties of a Damaged Composite Plate with Combined Damage Index and Finite Element Methods

et al. 2019

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In structural component applications the use of composite materials is increasing thanks to their optimal mechanical characteristics. However, the complexity of the damage evolution in composite materials significantly limits their widespread diffusion. Non-destructive tests are thus becoming ever more important. The detecting Damage Index (DId) technique has been recently brought in the realm of the non-destructive characterization tests for components made of composite material. In contrast to other techniques, this methodology allows to quantitatively assess local residual properties. In this paper, the DId technique is adopted in combination with the finite element method. The mechanical response of two composite plates (an 8-layer twill fabric carbon/epoxy) subjected to four-point bending test is firstly used to tune a finite element model of the laminate. Then, an undamaged laminate of the same composite material is progressively damaged through repeated four-point bending tests. Local residual elastic properties are mapped on the plate through the DId technique. A continuous polynomial curve has been considered to account for the variation of the elastic modulus in the finite element model. The resulting force-displacement curve of the numerical analysis is compared to experimental data of damaged plate, resulting in very good agreement. The combination of the experimental activity and the numerical finite element analysis points out the accuracy of the DId methodology in assessing local residual elastic properties of composite materials.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Of 14mentioning

confidence: 99%

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Assessment of Residual Elastic Properties of a Damaged Composite Plate with Combined Damage Index and Finite Element Methods

et al. 2019

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“…e IET is a quick and effective method for measuring Young's modulus in undamaged samples [11]. Compared to the standard mechanical characterization, the IET is less affected by the typical heterogeneity of thick composite laminates and provides more repeatable results based on local strain measurements, but yields slightly larger values, probably because of the detrimental effect of the deformation rate [12]. e prediction of which resonances will be observed in a measurement is straightforward using the resonance eigenvalues and eigenvectors.…”

Section: Introductionmentioning

confidence: 99%

Determination of Young’s Modulus by Specific Vibration of Basalt and Diabase

Quaglio

Silva

Rodovalho

et al. 2020

Advances in Materials Science and Engineering

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The elasticity is an important parameter for the evaluation of the mechanical behavior of a rock mass and a fundamental factor in the definition of the resistance characteristics, stability, and blastability in rock blasts, and it is an important parameter for the blastability equations like the Kuz–Ram method. This paper presents a comparison of the Uniaxial Compression Method (UCM) and the Impulse Excitation Technique (IET) in determining Young’s modulus. The IET is a static and nondestructive dynamic method of characterizing mechanical parameters of materials, while the UCM is a quasistatic and destructive method. We determined Young’s modulus of samples from nine basalt and diabase mines used as aggregates in the construction industry. Young’s modulus was determined by the acoustic response due to longitudinal oscillations caused by a mechanical impulse (IET) in the Sonelastic equipment and the stress-strain curve (UCM). Young’s modulus values showed high repeatability and agreed with those reported in the literature for the same material. The work shows that the solnelastic is an innovate equipment and elucidated advantages of IET in comparison to the UCM such as shorter execution time, greater safety, and a lower cost ranging from 11.5% to 22.5% of the UCM.

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“…The Impulse Excitation Technique was recently applied to damaged composite laminates for measuring the residual elastic properties [10]. As it requires two side access, in situ inspection of structures with the later technique remains challenging.…”

Section: Introductionmentioning

confidence: 99%

Local damage evaluation of a laminate composite plate using ultrasonic birefringence of shear wave

Rakotonarivo

Payan

Moysan

et al. 2018

Composites Part B: Engineering

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This paper presents an ultrasonic non-destructive testing method to locally characterize composite material damage through the analysis of the anisotropy behavior variation induced by damage. The approach is based on shear wave contact measurements and analyses shear wave birefringence to estimate variation of the attenuation coefficient and shear moduli ratio between warp and weft directions. The method only requires a single piezo-electric contact sensor and thus, is easy to implement for practical applications. Moreover, unlike other methods, it does not require any reference measurement in a calibrated medium such as water to evaluate attenuation coefficient variation and shear moduli ratio. It is shown that the proposed method allows to locally qualify damage with good repeatability and robustness.

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Damaged composite laminates: Assessment of residual Young's modulus through the Impulse Excitation Technique

Cited by 24 publications

References 16 publications

Assessment of Residual Elastic Properties of a Damaged Composite Plate with Combined Damage Index and Finite Element Methods

Assessment of Residual Elastic Properties of a Damaged Composite Plate with Combined Damage Index and Finite Element Methods

Determination of Young’s Modulus by Specific Vibration of Basalt and Diabase

Local damage evaluation of a laminate composite plate using ultrasonic birefringence of shear wave

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