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Barron, Valerie; Buggy, M.; McKenna, N. H.

doi:10.1023/a:1017576725885

Cited by 49 publications

(8 citation statements)

References 4 publications

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“…This was felt to be an important effect to assess. Even though Barron et al [22] found that fibre-dominated orientations exert smaller frequency effects on their fatigue behaviour than matrix-dominated orientations, higher test frequencies lower the dynamic properties of a composite structure due to hysteretic heating [22] and hence lead to more conservative results. Whenever narrow straps were tested, thin copper washers were placed on both sides of the strap to ensure the lateral support of the strap, which is reported to reduce stress concentrations [23].…”

Section: Methodsmentioning

confidence: 99%

Fretting Fatigue Behaviour of Pin-Loaded Thermoset Carbon-Fibre-Reinforced Polymer (CFRP) Straps

2016

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This paper focuses on the fretting fatigue behaviour of pin-loaded carbon-fibre-reinforced polymer (CFRP) straps studied as models for rigging systems in sailing yachts, for suspenders of arch bridges and for pendent cables in cranes. Eight straps were subjected to an ultimate tensile strength test. In total, 26 straps were subjected to a fretting fatigue test, of which ten did not fail. An S-N curve was generated for a load ratio R of 0.1 and a frequency f of 10 Hz, showing a fatigue limit stress of the straps around the matrix fatigue limit, corresponding to 46% of the straps' ultimate tensile strength (σ UTS ). The fatigue limit was defined as 3 million load cycles (N = 3ˆ10 6 ), but tests were even conducted up to N = 11.09ˆ10 6 . Catastrophic failure of the straps was initiated in their vertex areas. Investigations on the residual strength and stiffness properties of straps tested around the fatigue limit stress (for N ě 1ˆ10 6 ) showed little influence of the fatigue loading on these properties. Quasi-static finite element analyses (FEA) were conducted. The results obtained from the FEA are in good agreement with the experiments and demonstrate a fibre parallel stress concentration in the vertex area of factor 1.3, under the realistic assumption of a coefficient of friction (cof ) between pin and strap of 0.5.

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Section: Methodsmentioning

confidence: 99%

Fretting Fatigue Behaviour of Pin-Loaded Thermoset Carbon-Fibre-Reinforced Polymer (CFRP) Straps

2016

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“…The loading frequency in this paper was 5 Hz. The study [28] showed that the temperature rise inside the materials can be ignored when the loading frequency is less than 10 Hz. The fatigue loading was divided into the following stages: static pre-loading, twice-static loading, followed by fatigue loading.…”

Section: Methodsmentioning

confidence: 99%

Experimental Research and Analysis on Fatigue Life of Carbon Fiber Reinforced Polymer (CFRP) Tendons

et al. 2019

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The fatigue life of carbon fiber reinforced polymer (CFRP) tendons was studied in this paper. A new wedge-type anchorage system was applied to the fatigue test of CFRP tendons and demonstrated an excellent fatigue resistance. In the test and analytical data, the fatigue stress ranged from 200 MPa to 800 MPa, and maximum stresses from 0.37 to 1.0 fu (fu = ultimate tensile strength of CFRP tendons) were determined. The main work and results were that the stress range and stress level (maximum stress) were two key parameters affecting the fatigue life of CFRP tendons. A bilinear equation and a linear equation considering the fatigue life of CFRP tendons jointly affected by the stress range and the maximum stress were established. The error of predicted results and test results was 0.038 and 0.083, respectively, both representing good prediction accuracy. The predicted results of Whitney’s method showed that, at a 95% confidence level, when the stress range was 200 MPa, 400 MPa, and 600 MPa, the maximum stress limit of CFRP tendons, which were not broken in a fatigue test of 2 million times, was 63.9% fu, 53.0% fu, and 36.8% fu, respectively.

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Section: Introductionmentioning

confidence: 99%

“…Depending upon the material being tested, this can lead to excessive cost even before the actual design process has begun. Furthermore, the test machines can, at times, create inertia frequency effects and temperature changes [2,12,[19][20][21]. Typical vibration testing is a damage evaluation technique that uses frequency changes and modal property variations [22,23].…”

Section: Introductionmentioning

confidence: 99%

“…Traditional fatigue testing machines operate between 1 Hz and 15 Hz; however, inertial jig effects usually limit testing frequencies below 5 Hz for most engineering materials. The literature provides contrasting opinions on whether an increase in frequency can lead to an improvement or a reduction in the fatigue life [19][20][21]. According to some authors [11,12,19,37], temperature increase affects material properties and reduces fatigue life in sandwich composites.…”

Section: Introductionmentioning

confidence: 99%

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Development of a Vibration Technique Based on Geometric Optimization for Fatigue Life Evaluation of Sandwich Composite Structures

et al. 2021

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A major obstacle to obtaining cost-effective experimental data on the fatigue life of sandwich panels is the prohibitive amount of time and cost required to carry out millions of cycles. On the other hand, vibration techniques applied to sandwich geometries fail to match the stress patterns that are obtained from standard flexural fatigue tests. To overcome such limitations, a vibration-based fatigue technique is proposed, which entails the use of sandwich specimens whose geometries are optimized to reproduce the stress distribution observed during three point bend loading while vibrating at the first resonant frequency. The proposed vibration technique was experimentally validated. The results, compared with the average number of cycles to failure at different stress ratios obtained via the Three-Point Bending test, showed high levels of accuracy. The proposed method is robust and time effective and indicates the possibility of attaining fatigue lifetime prediction of a wide class of composite elements, such as sandwich panels.

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Cited by 49 publications

References 4 publications

Fretting Fatigue Behaviour of Pin-Loaded Thermoset Carbon-Fibre-Reinforced Polymer (CFRP) Straps

Fretting Fatigue Behaviour of Pin-Loaded Thermoset Carbon-Fibre-Reinforced Polymer (CFRP) Straps

Experimental Research and Analysis on Fatigue Life of Carbon Fiber Reinforced Polymer (CFRP) Tendons

Development of a Vibration Technique Based on Geometric Optimization for Fatigue Life Evaluation of Sandwich Composite Structures

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