A hysteresis-based damage parameter for notched composite laminates subjected to cyclic loading

Dharan, C. K. H.; Tan, T. F.

doi:10.1007/s10853-007-1498-9

Cited by 16 publications

(6 citation statements)

References 16 publications

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“…This method has been controversial as it does not explain the complex damage evolution phenomenon. Therefore, researchers used temperature to reconstruct all kinds of energy sources under fatigue loading as the damage parameters to evaluate fatigue performance 42–44 …”

Section: Developed Model Of Fatigue Life Predictionmentioning

confidence: 99%

Fatigue life prediction for the main spar with wrinkle defects of a wind turbine blade

Zhou

Xin

et al. 2021

Fatigue Fract Eng Mat Struct

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A practical method for predicting fatigue life of the main spar with wrinkle defects in a wind turbine blade is presented in this paper. First, the effect of different wrinkle geometry on stiffness in a composite laminate is quantified. Then, the model of intrinsic dissipated energy is proposed to determine the fatigue limit rapidly. A fatigue life prediction model containing unknown parameters is developed by introducing intrinsic dissipated energy to characterize stiffness degradation of the main spar laminate with wrinkle defects. The specimens with different wrinkle geometry are subjected to fatigue tests, monitored with an infrared thermography system to obtain experimental data. After determining the unknown parameters of the developed model, the S‐N curves of specimens are evaluated in a relatively short time. The predicted fatigue life is within the 95% confidence interval of lifetime obtained by the traditional tests, which suggests the developed model is accurate. This work is suitable for fatigue life prediction of main spar with different wrinkle defects.

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Section: Developed Model Of Fatigue Life Predictionmentioning

confidence: 99%

Fatigue life prediction for the main spar with wrinkle defects of a wind turbine blade

Zhou

Xin

et al. 2021

Fatigue Fract Eng Mat Struct

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show abstract

“…23 During the loading portion of each fatigue cycle some of the mechanical energy is stored in the material and the other is released back in the unloading portion of the cycle. 24,25 The stored energy in the material helps in creating new cracks or propagating the pre-existing cracks causing some energy to dissipate from the material and the surface temperature to increase. Based on surface temperature change of the material as a result of damage propagation during fatigue loading, IR thermography was used in the study to detect the propagation of damage form in the inserted gaps in the defected specimens.…”

Section: Experimental Testing and Ir Thermographymentioning

confidence: 99%

Experimental and numerical investigation of the effect of gaps on fatigue behavior of unidirectional carbon/epoxy automated fiber placement laminates

Elsherbini

Hoa

2016

Journal of Composite Materials

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Automated fiber placement (AFP) process provides high potential to repeatability and flexibility required for manufacturing of complex parts in many industries. Performance of such parts can be influenced by AFP manufacturing induced defects such as gaps and overlaps. In this work, the effect of gaps on fatigue behavior of unidirectional carbon/epoxy laminates was investigated. Tension-tension fatigue tests were conducted on defected samples and compared to reference samples free from defects. Infrared thermography technique was used for monitoring of damage propagation during fatigue loading. Moreover, a fatigue progressive damage model (FPDM) was developed and applied to laminates containing gaps to predict fatigue damage progression and failure. The experimental results revealed that the effect of gaps depends on the maximum applied stress during fatigue. The higher is the applied stress, the higher is the reduction in fatigue life. Good agreement was found between the results of fatigue life prediction from the FPDM and the experimental results for defected specimens.

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“…In a fatigue experiment, the area contained within a hysteresis loop represents all the energy associated with the degradation of matrix and fiber such as the plastic deformation, creation of microcracks, molecular orientation in the matrix, and deformation induced entropy [31,34,35]. Therefore, the rate of hysteresis energy…”

Section: Analyticalmentioning

confidence: 99%

Analysis and life prediction of a composite laminate under cyclic loading

Liakat

Khonsari

2016

Composites Part B: Engineering

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A hysteresis-based damage parameter for notched composite laminates subjected to cyclic loading

Cited by 16 publications

References 16 publications

Fatigue life prediction for the main spar with wrinkle defects of a wind turbine blade

Fatigue life prediction for the main spar with wrinkle defects of a wind turbine blade

Experimental and numerical investigation of the effect of gaps on fatigue behavior of unidirectional carbon/epoxy automated fiber placement laminates

Analysis and life prediction of a composite laminate under cyclic loading

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