A Joint Numerical-Experimental Study on Impact Induced Intra-laminar and Inter-laminar Damage in Laminated Composites

Riccio, Aniello; Caputo, Francesco; Felice, G. Di; Saputo, Salvatore; Toscano, Cinzia; Lopresto, V.

doi:10.1007/s10443-015-9457-0

Cited by 33 publications

(28 citation statements)

References 59 publications

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“…The numerical results of the stacked shell finite element model for the case of the laminated plate subjected to low velocity impact are presented in comparison with the experimental results of [20]. The force versus time and force versus displacement curves calculated by the stacked shell simulation for the three different energy levels are presented in Figure 4.…”

Section: Comparison Of Numerical and Experimental Resultsmentioning

confidence: 99%

“…During the unloading phase, the load capability tends to be underpredicted, a fact that can be attributed to a slight overprediction of the damage induced in plies. Table 3: FE results for the delamination envelope dimensions compared to the experimental results of [20] Stacked shell model predictions for the dimensions of the delamination envelope under the impacted area compared to results derived from NDT techniques are shown in Table 3. FE results correlate well with the experimental results, although for the lowest energy level, the delamination is slightly overestimated.…”

Section: Comparison Of Numerical and Experimental Resultsmentioning

confidence: 99%

“…The experimental procedure has been performed by Riccio et al [20] according to the European association of Aerospace Manufacturers standard prEN 6038. The experiment involves the impact of a hemispherical impactor on a laminated plate with rectangular geometry, fabricated by the G1157/RTM-6 material system.…”

Section: Description Of the Experimental Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Validation of Composite Structures in Explicit Impact Analysis

Fotopoulos¹,

Lampeas²

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Section: Comparison Of Numerical and Experimental Resultsmentioning

confidence: 99%

Section: Comparison Of Numerical and Experimental Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Validation of Composite Structures in Explicit Impact Analysis

Fotopoulos¹,

Lampeas²

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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“…where S(ω) is the Fourier Transform of the measured signal s(t) and the asterisk sign "*" corresponds to a complex conjugate operation. The three frequency components ωn, ωm and ωn + ωm have a special phase relation, called quadratic phase coupling (QPC) [17], which defined as follows: (6) where φn and φm are the phases of the signal at frequencies ωn and ωm, respectively, and φm+n is the phase of the signal at frequency ωn + ωm. QPC allows the identification of structural nonlinearity by discarding the signal noise that, differently, is not quadratic phase coupled [18].…”

Section: Nonlinear Parametersmentioning

confidence: 99%

“…These damaged modes weaken the mechanical properties of the structure and can be completely invisible when viewed from the external impacted surface. Hence, both linear and nonlinear ultrasonic structural health monitoring (SHM) techniques based on sparse transducer arrays have been developed in the last few years to provide an early warning and increase of safety of composite components [1][2][3][4][5][6]. Linear beamforming techniques, such as the statistical maximum-likelihood estimation [7] and the reconstruction algorithm for probabilistic inspection of damage (RAPID) [8] have shown a high level of accuracy for the detection and localisation of damage in composites.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear elastic multi-path reciprocal method for damage localisation in composite materials

et al. 2018

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Nonlinear ultrasonic techniques rely on the measurement of nonlinear elastic effects caused by the interaction of ultrasonic waves with the material damage, and have shown high sensitivity to detect micro-cracks and defects in the early stages. This paper presents a nonlinear ultrasonic technique, here named nonlinear elastic multi-path reciprocal method, for the identification and localisation of micro-damage in composite laminates. In the proposed methodology, a sparse array of surface bonded ultrasonic transducers is used to measure the second harmonic elastic response associated with the material flaw. A reciprocal relationship of nonlinear elastic parameters evaluated from multiple transmitter-receiver pairs is then applied to locate the micro-damage. Experimental results on a damaged composite panel revealed that an accurate damage localisation was obtained using the normalised second order nonlinear parameter with a high signal-to-noise-ratio (∼11.2dB), whilst the use of bicoherence coefficient provided high localisation accuracy with a lower signal-to-noise-ratio (∼1.8dB). The maximum error between the calculated and the real damage location was nearly 13mm. Unlike traditional linear ultrasonic techniques, the proposed nonlinear elastic multi-path reciprocal method allows detecting material damage on composite materials without a priori knowledge of the ultrasonic wave velocity nor a baseline with the undamaged component.

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Evaluation of the Mechanical Behavior of a Biocomposite Material in a Fuselage Section Numerical Drop Test

Manzo

Perfetto

Lamanna

et al. 2020

Macromolecular Symposia

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The ever-increasing need for eco-compatibility in all sectors of industry is pushing scientific research to look for the so-called environmentally friendly materials characterized by minimal environmental impact during the manufacturing process and high recyclability. In the aeronautical sector composites are well established for primary and secondary structures, but alternative biocompatible solutions are found out even if great efforts are being required to improve their properties. In this work, the mechanical behavior of a biocomposite material is tested by implementing it in an existing numerical model of a fuselage section subject to a vertical drop test. Deformations and failures of biocomposite parts are evaluated providing indications on their possible compliance with crashworthiness and airworthiness requirements.

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A Joint Numerical-Experimental Study on Impact Induced Intra-laminar and Inter-laminar Damage in Laminated Composites

Cited by 33 publications

References 59 publications

Experimental Validation of Composite Structures in Explicit Impact Analysis

Experimental Validation of Composite Structures in Explicit Impact Analysis

Nonlinear elastic multi-path reciprocal method for damage localisation in composite materials

Evaluation of the Mechanical Behavior of a Biocomposite Material in a Fuselage Section Numerical Drop Test

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