Delamination Detection of Composite Laminates Using Natural Frequency Vibration Method

Sultan, Rubina; Guirguis, S; Younes, M.M.; El-Soaly, E. E.

doi:10.21608/amme.2012.37258

Cited by 6 publications

(8 citation statements)

References 8 publications

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“…The area of damaged surfaces of sandwich panels subjected to low velocity impact was investigated using active infrared thermography, [ 62–65 ] it can be a helpful method for comparing the impact resistance of panels. Active infrared thermography is a technique based on a thermal excitation and an observing of a material response by an infrared camera.…”

Section: Inspection Of the Samplesmentioning

confidence: 99%

“…The material inhomogeneities or defects cause then a distortion of temperature field. In the present experimental process, active infrared thermography of the surface of the panels was done via external excitation thermal wave by hot air blower, [ 65 ] to an average heating temperature of 95 °F using an uncooled infrared camera (Fluke‐Ti25/9HZ) and then thermal images were presented using Smart View software. In addition, the affected surface area of the back surface of the panels was calculated using the Digimizer software, which is an image analyzer.…”

Section: Inspection Of the Samplesmentioning

confidence: 99%

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Experimental investigation of sandwich panels with hybrid composite face sheets and embedded shape memory alloy wires under low velocity impact

et al. 2020

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This experimental study was conducted to investigate the behavior of hybrid composite sandwich panels with superelastic shape memory alloy (SMA) wires under low velocity impact (LVI). Square-shaped sandwich panels were made few of a foam core and hybrid composite structures with carbon fiber and glass fiber, in which prestrained superelastic SMA wires were embedded between the layers. The sandwich panels had symmetrical and asymmetrical lay-ups and SMA wires were placed between the layers with different states. LVI tests were performed by drop weight impact testing machine. Moreover, damaged areas of the panels were estimated using thermography. The experimental results showed that the impact performance of the panels improved after embedding SMA wires. The presence of the SMA within the composite sandwich structure prevented the full perforation of the samples and reduced the internal delamination area. The utilization of SMA wires embedded in front face sheet, which is subject to the direct impact, is more effective than the utilization of wire in the back face layer. It was also found that increasing the layers of the back face and asymmetrication of the structure were more effective than the use of SMA wires in the symmetric structure in improving the panel impact resistance. K E Y W O R D S active infrared thermography, composite sandwich panel, damaged area, low velocity impact, superelastic SMA wire 1 | INTRODUCTION Sandwich panels are usually used for constructing lightweight structures with high mechanical load capacity. Composite sandwich panels composed of composite skins and a thick low-density core can improve different properties of structure such as stiffness, strength, sound insulation, low heat transfer, and high impact energy absorption. [1-4] Today, this type of structures is used in aerospace, marine, transport, and civil industries. [5] Low resistance under low velocity impact (LVI) loading is one of the important weaknesses of composite sandwich panels. Hence, in order to improve their performance, it is necessary to comprehensively investigate the behavior of composite sandwich panels under LVI. [6-10] The behavior of sandwich panels and hybrid composite structures under LVI has been extensively studied using

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Section: Inspection Of the Samplesmentioning

confidence: 99%

Section: Inspection Of the Samplesmentioning

confidence: 99%

Experimental investigation of sandwich panels with hybrid composite face sheets and embedded shape memory alloy wires under low velocity impact

et al. 2020

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“…In the last decade, a large number of non-destructive methods have been reported by the scientific and industrial community for the analysis of delamination defects in fiber-reinforced polymer (FRP) materials. Most of the reported papers suggested the techniques of ultrasounds [ 9 , 10 ], thermography [ 11 ], shearography [ 12 ], radiography [ 13 ], acoustic emission [ 14 ], and vibration-based solutions [ 15 , 16 , 17 , 18 ] for the detection and characterization of different defects in composite materials. Among the aforementioned techniques, vibration-based methods are considered as one of the most popular methods for damage detection because of their simplicity, versatility, and low cost, which facilitates their application to a more industrial environment.…”

Section: Introductionmentioning

confidence: 99%

Detection and Quantification of Delamination Failures in Marine Composite Bulkheads via Vibration Energy Variations

Garcia

Jurado

Zaba

et al. 2021

Sensors

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This paper proposes a new vibration-based structural health monitoring method for the identification of delamination defects in composite bulkheads used in small-length fiber-based ships. The core of this work is to find out if the variations of vibration energy can be efficiently used as a key performance indicator for the detection and quantification of delamination defects in marine composite bulkheads. For this purpose, the changes of vibrational energy exerted by delamination defects in sandwich and monolithic composite panel bulkheads with different types of delamination phenomenon are investigated using a non-destructive test. Experiments show that the overall vibration energy of the bulkheads is directly dependent on the damage conditions of the specimens and therefore, the variations of this parameter are a good indicator of the incorporation of delamination defects in composite bulkheads. Additionally, the overall vibration energy changes also give interesting information about the severity of the delamination defect in the panels. Hence, this methodology based on vibratory energy can be used to accurately determine delamination defects in medium-sized composite bulkheads with the advantages of being a simple and cost-effective approach. The findings of this research possess important applications for the identification of delamination failures in composite components such as bulkheads, turbine blades, and aircraft structures, among others.

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“…Vibration-based damage detection methods [6,7,12,13,14] using modal parameters which are easily and continuously extract from the oscillations of a working structure shows potential in structural health monitoring (SHM). The damage in the structure reduces the local stiffness, of the structures.…”

Section: Introductionmentioning

confidence: 99%

Delamination Assessment of FRP Composite Plate Using Natural Frequencies

Naidu,

Ratnam

2019

IJEAT

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The most frequent failure mode of composite plates is delamination. Deboning between the adjacent layers at a particular region of the multilayered composite plate is consider as delamination. It is due to a defect in the manufacturing practice or can be caused by service time conditions, for example, impact by foreign objects. Overall Stiffness of the composites reduces due to delamination. This paper presents the effect on natural frequency due to the delamination of the fiber-reinforced plastics (FRP) composites. In the finite element method, delamination is implemented as a VCCT or cohesive zone method, but in this article, delamination modeled as an open area in the interface layer in ANSYS ACP (pre).Numerical and experimental modal analysis is performed to delaminate as well as intact composite plates. Extract modal parameters like natural frequencies and mode shapes from the modal analysis. The results of the present paper compare among the existing simulation results and observe that good agreement between them. also, study the variation of frequencies with an increase of delamination. The new proposed modeling of delamination is simple and gives accurate results. This method is also used tostudy the delamination effect in composite plates.

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Delamination Detection of Composite Laminates Using Natural Frequency Vibration Method

Cited by 6 publications

References 8 publications

Experimental investigation of sandwich panels with hybrid composite face sheets and embedded shape memory alloy wires under low velocity impact

Experimental investigation of sandwich panels with hybrid composite face sheets and embedded shape memory alloy wires under low velocity impact

Detection and Quantification of Delamination Failures in Marine Composite Bulkheads via Vibration Energy Variations

Delamination Assessment of FRP Composite Plate Using Natural Frequencies

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