An investigation of the influence of moisture on fatigue damage mechanisms in a woven glass-fibre-reinforced PA66 composite using acoustic emission and infrared thermography

Malpot, Amélie; Touchard, Fabienne; Bergamo, Sébastien

doi:10.1016/j.compositesb.2017.07.017

Cited by 30 publications

(14 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

About the fatigue endurance of unidirectional flax-epoxy composite laminates

Jeannin

Gabrion

Ramasso

et al. 2019

Composites Part B: Engineering

View full text Add to dashboard Cite

show abstract

“…In this type of studies, a main assumption is done: signals are affected by propagation but they remain images of sources. Therefore, acoustic emission events can be classified using multivariable statistical analysis techniques and then attributed to a damage mechanism in the material [5][6][7][8][9][10][11][12]. The main assumption is: the acoustic signatures are unchanged during propagation and damage evolution.…”

Section: Introductionmentioning

confidence: 99%

“…For the unsupervised pattern recognition, the descriptors should be relevant and limited in number. The possibility to identify AE signatures of damage mechanisms is an established field [5][6][7][8][9][10][11][12]. In most studies, the attribution of system.…”

Section: Introductionmentioning

confidence: 99%

Challenges and Limitations in the Identification of Acoustic Emission Signature of Damage Mechanisms in Composites Materials

2018

View full text Add to dashboard Cite

Acoustic emission is a part of structural health monitoring (SHM) and prognostic health management (PHM). This approach is mainly based on the activity rate and acoustic emission (AE) features, which are sensitive to the severity of the damage mechanism. A major issue in the use of AE technique is to associate each AE signal with a specific damage mechanism. This approach often uses classification algorithms to gather signals into classes as a function of parameters values measured on the signals. Each class is then linked to a specific damage mechanism. Nevertheless, each recorded signal depends on the source mechanism features but the stress waves resulting from the microstructural changes depend on the propagation and acquisition (attenuation, damping, surface interactions, sensor characteristics and coupling). There is no universal classification between several damage mechanisms. The aim of this study is the assessment of the influence of the type of sensors and of the propagation distance on the waveforms parameters and on signals clustering.

show abstract

“…Studies have shown that the WF/HDPE damage and fracture behavior are closely related to the fiber/matrix interface [4]. The damage and failure modes of fiber reinforced polymer composites are mainly divided into fiber pull-out, fiber breakage and delamination, matrix cracking, and fiber-matrix debonding [5,6,7,8,9]. However, it has been difficult to accurately and effectively distinguish the failure modes and understand the evolution of the damage mechanism of high-filled WF/HDPE by using the traditional evaluation methods and testing techniques.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Identification of the Mechanism of Damage and Fracture of High-Filled Wood Fiber/Recycled High-Density Polyethylene Composites

Guo

Zhu

2019

Polymers

View full text Add to dashboard Cite

The damage and fracture of fiber reinforced polymer composites are vital constraints in their applications. To understand the mechanism of damage of wood fiber (WF) reinforced high density polyethylene (HDPE) composites, we used waste WF and recycled HDPE (Re-HDPE) as the raw materials and prepared high-filled WF/Re-HDPE composites via extrusion. The damage and fracture mode and failure mechanism of the composites with different WF contents (50%, 60%, and 70%) was studied under a three-point bending test by combining the acoustic emission (AE) technique and scanning electron microscope (SEM) analysis. The results show that AE technology can better assist in understanding the progress of damage and fracture process of WF/Re-HDPE composites, and determine the damage degree, damage accumulation, and damage mode. The damage and fracture process of the composites presents three main stages: the appearance of initial damage, damage accumulation, and destructive damage to fracture. The matrix deformation, fiber breakage, interface delamination, fiber-matrix debonding, fiber pull-out, and matrix cracking were the dominant modes for the damage of high-filled WF/Re-HDPE composites under bending load, and the AE signal changed in different damage stages and damage modes. In addition, the WF content and repeated loading had a significant influence on the composite’s damage and fracture. The 50% and 60% WF/Re-HDPE composites produced irreversible damage when repeated load exceeded 75% of the maximum load, while 25% of the maximum load could cause irreversible damage for 70% WF/Re-HDPE composites. The damage was accumulated owing to repeated loading and the mechanical properties of the composites were seriously affected.

show abstract

An investigation of the influence of moisture on fatigue damage mechanisms in a woven glass-fibre-reinforced PA66 composite using acoustic emission and infrared thermography

Cited by 30 publications

References 43 publications

About the fatigue endurance of unidirectional flax-epoxy composite laminates

About the fatigue endurance of unidirectional flax-epoxy composite laminates

Challenges and Limitations in the Identification of Acoustic Emission Signature of Damage Mechanisms in Composites Materials

Analysis and Identification of the Mechanism of Damage and Fracture of High-Filled Wood Fiber/Recycled High-Density Polyethylene Composites

Contact Info

Product

Resources

About