Thickness scaled compression tests in unidirectional glass fibre reinforced composites in static and fatigue loading

Lahuerta, F.; Nijssen, R.P.L.; Meer, F.P. van der; Sluys, L.J.

doi:10.1016/j.compscitech.2015.12.008

Cited by 11 publications

(11 citation statements)

References 13 publications

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“…The size effect analysis in the compression test for unidirectional GFRP composites was performed. Lahuerta et al (2016) have performed the analysis with 4, 10 and 20 mm thick laminates of glass/epoxy compression test. The static test with different thickness level does not show any variation.…”

Section: Fatigue Testing Methods For Wind Turbine Bladesmentioning

confidence: 99%

“…The failure cycle versus reserve factor for variable thickness is shown in Figure 14. The influence of curing cycle in the laminate thickness was considered as the main cause for the fatigue properties to decrease (Lahuerta et al, 2016).…”

Section: Fatigue Testing Methods For Wind Turbine Bladesmentioning

confidence: 99%

“…The technical aspect, economic aspect and legal aspect are the three aspects for the lifetime extension of the wind turbines with fatigue as a part of Figure 14. Reserve factor versus cycles to failure for variable thickness (Lahuerta et al, 2016).…”

Section: Fatigue Testing Methods For Wind Turbine Bladesmentioning

confidence: 99%

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A review on fatigue damages in the wind turbines: Challenges in determining and reducing fatigue failures in wind turbine blades

Subbiah

Ranganathan

et al. 2019

Wind Engineering

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The wind energy has been recognised as one of the rising sustainable energies in the world. The wind turbines are subjected to high aerodynamic loads and they cause vibrations due to the wake formation. The magnitude of the applied loads has significant effects on the crack propagation. The fatigue loads have been identified as one of the key sources of damage, with delamination as the main cause for the failure of the turbine blades. The article presents a review of fatigue damages that have been experienced in the wind turbine blades, and factors that are influenced due to the fatigue loads are discussed. The causes and effects of the fatigue loads have been highlighted, and the ways for preventing the fatigue damage by improving the design lifetime are mainly concentrated in review. The overall review gives an idea for determining and reducing the crack growth in wind turbine blades.

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Section: Fatigue Testing Methods For Wind Turbine Bladesmentioning

confidence: 99%

Section: Fatigue Testing Methods For Wind Turbine Bladesmentioning

confidence: 99%

See 1 more Smart Citation

A review on fatigue damages in the wind turbines: Challenges in determining and reducing fatigue failures in wind turbine blades

Subbiah

Ranganathan

et al. 2019

Wind Engineering

View full text Add to dashboard Cite

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“…This combined loading method is also standardized for static compression tests in ASTM D 6641 and was used for compression-compression testing of thick laminates. [29,30] The comparison of static compression strength for different gripping pressures or end to shear loading ratios shows that the correct gripping pressure is mandatory for correct measurements. [30] For thicker specimens, this also mandates a longer clamping length to keep the gripping pressure optimal for increasing testing loads.…”

Section: Combined Loadingmentioning

confidence: 99%

Compression Fatigue Testing Setups for Composites—A Review

Baumann

Hausmann

2020

Adv Eng Mater

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Continuous fiber reinforced plastics show major advantages in tensile loading conditions. This is especially true for cyclic loading due to the good fatigue performance provided by glass and carbon fibers. However, it is widely accepted that compressive loading is a critical load case for most composites. For fiber reinforced plastics, this is mostly due to instabilities on different length scales-beginning at the smallest scale with microbuckling of single fibers to instabilities of fiber bundles, namely, fiber kinking, up to global buckling of the hole laminate. The sequence of events is hard to discern for quasi-static testing, and often, it remains unclear as to the cause of failure. This is even more the case for compressive fatigue testing. Different approaches can be found in the literature on how fatigue tests should be performed. A mandatory requirement for reliable design data is tested under conditions found in subsequently manufactured components. Therefore, it is generally sought to prevent the global buckling while allowing for all other damage mechanisms to take place. Two main testing strategies for axially loaded plates or strip-like specimens can be identified to achieve this goal. One common strategy is shortening the gauge length to a value where global buckling occurs after compressive failure. The second approach uses anti-buckling guides to prevent global buckling. These testing strategies are established methods for static compression testing and are sometimes also used for fatigue testing. However, the number of fixtures in both approaches is numerous, and only some of the fixtures are viable for fatigue testing. These generally accepted methods for compression testing are supplemented by different specimen geometries or loading conditions. A generalized overview is given in Figure 1. The aim of this review is to evaluate the applicability of these testing methods in terms of compressive fatigue testing, namely, loading ratios (load ratio R < 0 and R > 1) containing compressive loads. The evaluation is based on the reported use of a test setup or by discussion of pros and cons of setups for quasi-static testing. This approach is necessary, as the number of reported works on compressive fatigue testing is sparse. This review is structured by testing type rather than chronological order. Before evaluating compression testing methods, a quick summary of failure modes observed in static compression testing is given along with the damage progression under compressive fatigue loading. The review of testing methods then starts with axially loaded flat specimens. In the second and third parts, work on bending tests and tubular specimens is reviewed, respectively. 2. Failure Modes 2.1. Compressive Failure Modes in Fiber Reinforced Composites The properties of fiber reinforced plastics depend mainly on the type of reinforcement chosen as well as the stacking sequence of layers within a laminate. For compressive loads, the matrix

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“…On one hand, the residual strains which drive a micro-damage mechanism by which interface fractures diminish the macro-mechanical properties. And on the other, the resin and interface adhesion properties depend on the curing path, which leads to a gradient of mechanical strengths related to the thermal history [17].…”

Section: Introductionmentioning

confidence: 99%

Manufacturing curing cycles influence on local fracture toughness properties at micro and macro scale

Lahuerta

Raijmaekers

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Thickness scaled compression tests in unidirectional glass fibre reinforced composites in static and fatigue loading

Cited by 11 publications

References 13 publications

A review on fatigue damages in the wind turbines: Challenges in determining and reducing fatigue failures in wind turbine blades

A review on fatigue damages in the wind turbines: Challenges in determining and reducing fatigue failures in wind turbine blades

Compression Fatigue Testing Setups for Composites—A Review

Manufacturing curing cycles influence on local fracture toughness properties at micro and macro scale

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