Surface Irregularity Factor as a Parameter to Evaluate the Fatigue Damage State of CFRP

Zuluaga-Ramírez, Pablo; Frövel, Malte; Belenguer, T.; Salazar, F.

doi:10.3390/ma8115407

Cited by 7 publications

(5 citation statements)

References 24 publications

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“…Yang et al 23,24 provided two methods to predict the statistical distribution of residual stiffness according to the presence or absence of historical data in the laboratory. Zuluaga-Ramı´rez et al 25,26 applied constant-amplitude fatigue loads and realistic variableamplitude loads which represent real in-flight conditions to ''dog bone'' shaped tensile specimens, and found that the coupons cycled with higher severity loads present faster stiffness degradation, which confirms that the stiffness degradation can be employed to determine the damage state due to fatigue loads.…”

Section: Introductionmentioning

confidence: 98%

Fatigue life prediction of composite structures based on online stiffness monitoring

Zong

Yao

2017

Journal of Reinforced Plastics and Composites

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This article presents an online statistical life prediction method based on both historical and local residual-stiffness information to reduce the effect of dispersive mechanical properties of fiber-reinforced plastic structures. Normalized residual-stiffness curves obtained from the laboratory are used as a benchmark, and the model parameters are assumed to be independent random variables. According to Bayesian statistical theory, the prior distribution of fatigue life is updated by the residual-stiffness sample information of the in-service structure through online monitoring; then, a more accurate life estimation is obtained. This method precisely captures the essence of stiffness degradation of a composite structure. The individual dispersion effect is largely eliminated through using the local stiffness data. In general, a more accurate life estimation can be obtained if more sample information is available. The test results of glass-fiber-reinforced plastic and carbon-fiber-reinforced plastic laminates show that the fatigue life can be accurately predicted with only the first 20% residual-stiffness data known.

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Section: Introductionmentioning

confidence: 98%

Fatigue life prediction of composite structures based on online stiffness monitoring

Zong

Yao

2017

Journal of Reinforced Plastics and Composites

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“…The area of tear was compared with 3 D ×1.8 as a reference, and the tear evaluation factor could be obtained. Zuluaga-Ramírez et al 16 correlated the surface irregularity factor with stiffness degradation, and proposed a new method for evaluating the damage state of CFRP. The surface irregularity factor of CFRP was measured by optical method, and the fatigue damage of material was evaluated by equal-amplitude fatigue load and real variable-amplitude load.…”

Section: Introductionmentioning

confidence: 99%

A subjective-objective evaluation method of hole surface quality in drilling CFRP-Ti stacks

Liu

Wang

Zhang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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Hole surface quality in drilling carbon fiber-reinforced plastics and titanium alloy (CFRP-Ti) stacks is a key factor affecting high-quality assembly and reliable usage of the structure so it need be reasonably evaluated. However, there is no standardized evaluation system of hole surface quality in drilling CFRP-Ti stacks. The existing evaluation indexes cannot meet the evaluation requirements on the surface quality of the hole. This paper proposes a subjective-objective evaluation method to evaluate the surface quality of the hole in drilling CFRP-Ti stacks. Firstly, the evaluation factors are determined by experiments, including CFRP delamination, CFRP hole entrance tears, surface roughness of CFRP and Ti, and the evaluation system is established according to defect characteristics and industry standards. Secondly, the subjective evaluation model is established based on the improved analytic hierarchy process, the objective evaluation model is established based on the entropy weight method and the subjective and objective combination weight calculation method is obtained based on the principle of minimum discriminant information. Finally, the surface quality of the hole is evaluated by subjective, objective, subjective-objective evaluation methods respectively. The result shows that subjective-objective evaluation method is more reasonable and effective.

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“…Carbon fiber reinforced polymer (CFRP) laminates are increasingly utilized in the aerospace and civil engineering fields for their low weight, high strength, and high stiffness [ 1 , 2 , 3 ]. During the long-term operation of CFRP laminated beam components, such as aircraft wings and wind turbine blades, cracks can occur on their surfaces, jeopardizing the integrity and safety of the whole structures [ 4 , 5 , 6 ]. Thus, identifying cracks in CFRP laminated beam is of great significance [ 7 , 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Crack Identification in CFRP Laminated Beams Using Multi-Resolution Modal Teager–Kaiser Energy under Noisy Environments

Cao

Ding

et al. 2017

Materials

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Carbon fiber reinforced polymer laminates are increasingly used in the aerospace and civil engineering fields. Identifying cracks in carbon fiber reinforced polymer laminated beam components is of considerable significance for ensuring the integrity and safety of the whole structures. With the development of high-resolution measurement technologies, mode-shape-based crack identification in such laminated beam components has become an active research focus. Despite its sensitivity to cracks, however, this method is susceptible to noise. To address this deficiency, this study proposes a new concept of multi-resolution modal Teager–Kaiser energy, which is the Teager–Kaiser energy of a mode shape represented in multi-resolution, for identifying cracks in carbon fiber reinforced polymer laminated beams. The efficacy of this concept is analytically demonstrated by identifying cracks in Timoshenko beams with general boundary conditions; and its applicability is validated by diagnosing cracks in a carbon fiber reinforced polymer laminated beam, whose mode shapes are precisely acquired via non-contact measurement using a scanning laser vibrometer. The analytical and experimental results show that multi-resolution modal Teager–Kaiser energy is capable of designating the presence and location of cracks in these beams under noisy environments. This proposed method holds promise for developing crack identification systems for carbon fiber reinforced polymer laminates.

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Surface Irregularity Factor as a Parameter to Evaluate the Fatigue Damage State of CFRP

Cited by 7 publications

References 24 publications

Fatigue life prediction of composite structures based on online stiffness monitoring

Fatigue life prediction of composite structures based on online stiffness monitoring

A subjective-objective evaluation method of hole surface quality in drilling CFRP-Ti stacks

Crack Identification in CFRP Laminated Beams Using Multi-Resolution Modal Teager–Kaiser Energy under Noisy Environments

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