Damage of Composite Materials

Jollivet, Thomas; Peyrac, Catherine; Lefèbvre, Fabien

doi:10.1016/j.proeng.2013.12.128

Cited by 77 publications

(52 citation statements)

References 5 publications

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“…Starting with the specimens tested by means of the MMB method, Figure 9 shows the region close to the insert used to initiate delamination in a fatigue specimen for a mode mixity ratio of 0.2. The existence of broken fibers can be observed as proof of the prior existence of fiber bridges [37,38,39] and also river markings [37,40], characteristic structures of mode I fracture, together with cusps [39,41,42,43], which are characteristic of mode II fracture. This clearly indicates that both fracture modes coexist at the crack front when carrying out the test.…”

Section: Analysis Of Fracture Surfacesmentioning

confidence: 99%

Influence of the Test Method on the Characterization of the Fatigue Delamination Behavior of a Composite Material under Mixed Mode I/II Fracture

et al. 2019

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Composite materials manufactured by overlapping plies with certain specific geometries are likely to lose part of their strength due to the presence of internally delaminated regions. The aim of this paper is to experimentally evaluate the generation and propagation of these interlaminar cracks in a carbon-epoxy composite material subjected to fatigue loading under mixed mode I/II fracture. Two different test methods were used for this purpose: The standardized mixed-mode bending (MMB) test and the asymmetric double cantilever beam (ADCB) test, with the goal of exploring the viability of the ADCB test as a simpler alternative to perform than the MMB test, especially in fatigue testing. With this aim in mind and after prior static characterization of the material in which the critical values of the energy release rate were determined under both test methods, the levels of the energy release rate to be applied in fatigue tests were defined for two mode mixity ratios, GII/Gc = 0.2 and 0.4 (0.34 ADCB), and a fatigue loading ratio, R = Gmin/Gmax = 0.1. The G-N fatigue onset curves were subsequently obtained from these experimental data. The most relevant result of the study is that the fatigue limits obtained using the MMB method are generally more conservative than those obtained via the ADCB method.

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Section: Analysis Of Fracture Surfacesmentioning

confidence: 99%

Influence of the Test Method on the Characterization of the Fatigue Delamination Behavior of a Composite Material under Mixed Mode I/II Fracture

et al. 2019

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“…Based on the size and the location of the reinforcement as well as the amount of applied mechanical loading, different stages in the damage process arise sooner or later. The initial damage stages comprise failure of network interfaces requiring low energy usage while the final phases comprising fiber breakage need a higher energy level [18]. At an early loading stage, microcracks are introduced in composite materials but these materials still have the ability to carry the loads before the final fracture.…”

Section: Fatigue Crack Growthmentioning

confidence: 99%

Micromechanical analysis of fatigue and crack growth in carbon-fiber epoxy composites based on mechanical testing

Jelić¹,

Sekulić

Stamenović³

et al. 2020

Hem Ind

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The paper presents static and dynamic tests of carbon/epoxy composite materials with fiber orientation at 0?/90? and ?45?. The main tensile properties were determined as a basis for subsequent dynamic tests, in which permanent dynamic strength, crack growth, and crack growth rate in the material due to the action of fatigue load were assessed. Comparisons were made regarding the structure of the tested specimens. Samples were obtained from prepregs with a specific density of 1600 kg/m3. The tests were performed at room temperature. Scanning electron microscopy (SEM) was used to analyze the damage in the material during these tests, the mechanisms of their further damage progression and, the impact on the growth and growth rate of the initial crack in the material. The analysis of numerical results and micromechanical analysis confirmed the dominant role of the reinforcing structural element in the material in all performed tests. The obtained results are of great importance in the application of composite materials of such structures under different operating conditions and load regimes. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. 451-03-68/2020-14/200135]

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“…Composite materials’ defects (crack, delamination, etc.) may arise as a result of the technological properties of the manufacturing process, as well as mechanical impact excessing stress allowance during the exploitation [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric Transducer-Based Diagnostic System for Composite Structure Health Monitoring

Dragašius

Eidukynas

Jurenas

et al. 2021

Sensors

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This paper focuses on the investigation of the diagnostic system for health monitoring and defects, detecting in composite structures using a piezoelectric sensor. A major overview of structural defects in composite materials that have an influence on product performance as well as material strength is presented. Particularly, the proposed diagnostic (health monitoring) system enables to monitor the composite material plate defects during the exploitation in real-time. The investigated health monitoring system can indicate the material structure defects when the periodic test input signal is provided to excite the plate. Especially, the diagnostic system is useful when the defect placement is hard to be identified. In this work, several various numerical and experimental studies were carried out. Particularly, during the first study, the piezoelectric transducer was used to produce mechanical excitation to the composite plate when the impact response is measured with another piezoelectric sensor. The second study focuses on the defect identification algorithms of the raw hologram data consisting of the recorded oscillation modes of the affected composite plate. The main paper results obtained in both studies enable us to determine whether the composite material is characterized by mechanical defects occurring during the response to the periodic excitation. In case of damage, the observed response amplitude was decreased by 70%. Finally, using the time-domain experimental results, the frequency response functions (FRFs) are applied to damage detection assessment and to obtain extra damage information.

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Damage of Composite Materials

Cited by 77 publications

References 5 publications

Influence of the Test Method on the Characterization of the Fatigue Delamination Behavior of a Composite Material under Mixed Mode I/II Fracture

Influence of the Test Method on the Characterization of the Fatigue Delamination Behavior of a Composite Material under Mixed Mode I/II Fracture

Micromechanical analysis of fatigue and crack growth in carbon-fiber epoxy composites based on mechanical testing

Piezoelectric Transducer-Based Diagnostic System for Composite Structure Health Monitoring

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