PE-HD fatigue damage accumulation under variable loading based on various damage models

Bourchak, Mostefa; Aid, A.

doi:10.3144/expresspolymlett.2017.13

Cited by 23 publications

(9 citation statements)

References 27 publications

(33 reference statements)

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“…For instance, in Bourchak and Aid, 44 the values for high density polyethylene were determined as follows: σ = AN b , A = 33.5, b = −0.0728. It gives m = 1/ b = 13.7.…”

Section: Quality Of Repair and Role Of Defectsmentioning

confidence: 99%

Costs of repair of wind turbine blades: Influence of technology aspects

Mishnaevsky

Thomsen

2020

Wind Energy

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The influence of repair technology of wind turbine blades on the levelized costs of energy (LCOE) is analyzed. The contribution of minor and major failure to the operational expenditures (OPEX) of wind turbines is estimated. It is demonstrated that the minor failure, mainly, surface erosion, is the largest contributor to the unplanned repair, 12 times higher than structural failure. The shortening of material curing procedure can lead to the significant reduction of repair costs, and LCOE, and expand the so-called "repair window." The analysis of the role of defects and voids in adhesives on the post-repair lifetime of wind turbine blades and energy costs is carried out. Using the continuum damage mechanics approach, it is demonstrated that the voids in adhesives drastically reduce the post-repair lifetime of wind turbine blades.

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“…For instance, in Bourchak and Aid, 44 the values for high density polyethylene were determined as follows: σ = AN b , A = 33.5, b = −0.0728. It gives m = 1/ b = 13.7.…”

Section: Quality Of Repair and Role Of Defectsmentioning

confidence: 99%

Costs of repair of wind turbine blades: Influence of technology aspects

Mishnaevsky

Thomsen

2020

Wind Energy

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“…Many researchers have developed different fatigue damage criteria with certain levels of success. Bourchak and Aid [1] employed both the maximum stress criterion and the strain energy density criterion to estimate the fatigue damage of the polymer pipes. Their comparison showed different results between the two criteria.…”

Section: Introductionmentioning

confidence: 99%

Effective strain criterion under multimode and multiaxial loadings – A rubber S–N curve with the scatter-band factor of 1.6 from 90 fatigue cases

Luo¹

2022

Express Polym. Lett.

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The effective strain criterion, unifying multimode and multiaxial loadings to a single parameter and being expressed in analytical form with no need to rotate a plane to search the maximum damage parameter, is proposed for the fatigue design of anti-vibration components. The validation procedure was performed on 90 cases in two aspects: fatigue damage and crack orientation. All predicted fatigue cracks were located at the places where the effective strain reached its maximum and was consistent with the experimental observations. The failure planes predicted correlated with the experimental measurement. The S-N curve covered over 10 2 to 2.4•10 6 cycles and achieved high accuracy with the scatter-band of 1.8. The proposed approach was applied to two non-proportional loading cases (one in a phase angle 45° and the other in a phase angle 90°). The results seemed to indicate the suitability of the approach for the non-proportional loading calculations. It would be possible to combine the proposed approach with the critical plane method in non-proportional loadings: using the proposed approach to find the critical loading range and then using the critical plane method to determine the maximum values of the required damage variables. Both the proposed concept and the obtained S-N curve would be beneficial in rubber fatigue design. More engineering cases may be needed to verify this approach further.

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“…Some investigations indicated that the criteria were restricted to certain conditions. Bourchak and Aid, 20 for example, obtained different results for pipe fatigue using a strain energy density criterion and a maximum stress criterion. Artificial intelligence was also introduced to predict rubber fatigue damage and showed an excellent result 21 .…”

Section: Introductionmentioning

confidence: 99%

Strain‐based fatigue criterion for rubber damage under multimode loadings

Luo

2022

J of Applied Polymer Sci

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An accurate prediction of the fatigue life of a rubber product is based on a criterion. Since strain can be measured directly in rubber components during a test, it would help design engineers improve product performance effectively if the strain‐based damage criteria can achieve high accuracy. Hence, the experimental data on the AE42 and AE2 specimens were utilized to test the suitability of the proposed damage criterion for rubber materials. The criterion includes three principal components determined by both a strain range and a current strain. Data from AE42 specimens, made from styrene‐butadiene rubber, contained 40 cases, that is, tension, torsion, and tension‐torsion loadings. An S‐N curve was obtained, with a scatter band of 0.7 and a coefficient of determination R2 of 0.81. The curve could be useful at the design stage. A sample of AE2, made from natural rubber filled with carbon black, showed the location and orientation of the crack in a nonproportional case. The predicted location of the fatigue crack was consistent with the experimental observation and the crack orientation matched the experimental measurement, that is, the predicted angle of 33.4° versus the measurement of approximately 40°. It would be possible to combine the proposed approach with the critical plane method in nonproportional loadings to save significant CPU time: using the proposed approach to find the critical loading range and then using the critical plane method to find the maximum value of the required damage variables. More engineering cases are needed to further verify this proposed criterion.

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PE-HD fatigue damage accumulation under variable loading based on various damage models

Cited by 23 publications

References 27 publications

Costs of repair of wind turbine blades: Influence of technology aspects

Costs of repair of wind turbine blades: Influence of technology aspects

Effective strain criterion under multimode and multiaxial loadings – A rubber S–N curve with the scatter-band factor of 1.6 from 90 fatigue cases

Strain‐based fatigue criterion for rubber damage under multimode loadings

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