Residual strength assessment of wind turbine rotor blade composites under combined effects of natural aging and fatigue loads

Gao, Jianxiong; An, Zongwen; Ma, Qiang; Bai, Xuezong

doi:10.17531/ein.2020.4.3

Cited by 9 publications

(4 citation statements)

References 38 publications

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“…This technique consists of the optical observation of defined points on the surface of the structure under test and the digital processing of the recorded images under various loading conditions. In general, the studies can also consider the effects of fatigue loads and effects of natural aging on the residual strength of the composite structure [11].…”

Section: Introductionmentioning

confidence: 99%

Deformation measurement system for UAV components to improve their safe operation

Czyż,

Jakubczak,

Podolak

et al. 2023

Eksploatacja i Niezawodność – Maintenance and Reliability

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The paper presents the authors’ method and test rig for performing the deformation analysis of unmanned aircraft fuselages. To conduct the analysis, the DIC system was used, as well as a test rig designed and constructed by the authors, equipped with a dedicated control and load control system. The article presents a description of the research capabilities of the test rig developed for testing the deformation of unmanned aircraft fuselages. Due to the specific operating conditions of the designed fuselage, the test rig developed allows the simulation of loads corresponding to different flight conditions. In addition, it is possible to change the forces acting on the fuselage simultaneously for all servos or each of them separately. Finally, results showing the displacement of component control points for the considered fuselage versions are presented. The tests carried out using the developed test rig allowed the verification of the maximum deformations.

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Section: Introductionmentioning

confidence: 99%

Deformation measurement system for UAV components to improve their safe operation

Czyż,

Jakubczak,

Podolak

et al. 2023

Eksploatacja i Niezawodność – Maintenance and Reliability

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“…Starting with the design phase, through manufacture and finally the operation of the items, reliability aspects constitute one of fundamental issues [4]. Despite the difficulties caused by the construction of reliability models, engineering solutions are based on them due to economic issues, but first and foremost to issues resulting from the safety of people operating a given item [15].…”

Section: Introductionmentioning

confidence: 99%

An assessment of the reliability of CFRP composites used in nodes of friction after impact of UV-A impacts and thermal shocks

Krzyzak,

Racinowski,

Szczepaniak

et al. 2023

Eksploatacja i Niezawodność – Maintenance and Reliability

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This article describes the results of tribological research into epoxy-based composites reinforced with carbon fiber. The composites were subjected to accelerated tests simulating a semi-annual influence of environmental conditions of an elevated temperature, precipitation in combination with an influence of UV-A radiation of 0.83 W/m 2 as well as cyclic thermal shocks causing a leap temperature difference of 116.5°C. The process of friction was conducted in conditions of dry friction and wet friction in the presence of water. The authors found a positive influence of a two-month impact of environmental conditions upon increasing wear resistance. They found a reduction in weight in conditions of friction with water. At the same time, a reliability analysis for the same boundary conditions showed an increased risk of critical composite damage. The article indicates areas of safe exploitation of composites and areas of the necessity of withdrawing composites from further exploitation under the assumed environmental and tribological loads.

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“…[1][2][3][4] It is precisely these advantages that GFRP has become the main material of wind turbine blades, and its amount accounts for more than 90% of the total weight of the blade. [5][6][7] However, with the improvement of structural load-bearing level and requirement of long-term service life, the fatigue failure of GFRP structure is gradually exposed on the account of serious safety accidents and huge economic losses. Therefore, the fatigue failure of the GFRP structure is one of the urgent problems to be solved in the field of composite today.…”

Section: Introductionmentioning

confidence: 99%

A model of strength degradation for glass fiber reinforced polymer composite laminates under fatigue loading

Song

Tang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In order to overcome the shortcoming of traditional strength modeling of glass fiber reinforced polymer (GFRP) composite laminates that require a large amount of strength test data, a strength degradation model on the account of residual stiffness degradation data is proposed. First, fatigue damage growth can be described by the gradual reduction of the stiffness and strength, and damage expressed by the two degradation methods are equivalent. Second, according this assumption, the connection between the two damage indices is established, and then a four parameters strength degradation model is obtained. Finally, the proposed model is validated by the applying experimental data of GFRP laminates, and the precision of proposed model is contrasted with other four models. Verification results indicate that if the residual stiffness degradation data is known, the residual strength degradation law can be predicted by a small number of residual strength tests and the presented model has better applicability and higher fitting accuracy.

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Residual strength assessment of wind turbine rotor blade composites under combined effects of natural aging and fatigue loads

Cited by 9 publications

References 38 publications

Deformation measurement system for UAV components to improve their safe operation

Deformation measurement system for UAV components to improve their safe operation

An assessment of the reliability of CFRP composites used in nodes of friction after impact of UV-A impacts and thermal shocks

A model of strength degradation for glass fiber reinforced polymer composite laminates under fatigue loading

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