DEGRADATION MODEL OF RESIDUAL STIFFNESS OF COMPOSITE MATERIALS UNDER CONSTANT AMPLITUDE LOAD

Song Jiangbei; An Zongwen; Tang Ting; Ma Qiang; Huang Tao

doi:10.19912/j.0254-0096.tynxb.2020-0562

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (3) : 382-387. DOI: 10.19912/j.0254-0096.tynxb.2020-0562

DEGRADATION MODEL OF RESIDUAL STIFFNESS OF COMPOSITE MATERIALS UNDER CONSTANT AMPLITUDE LOAD

Song Jiangbei, An Zongwen, Tang Ting, Ma Qiang, Huang Tao

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Abstract

Based on the analysis of the existing fatigue damage accumulation models of composite laminates, a method considering fatigue damage evolution process for describing stiffness degradation of composite laminates under constant amplitude fatigue load is proposed. The proposed model is suitable for describing three-stage nonlinear stiffness degradation of composite laminates. The validity of the model is verified by T300/HT3, the test data of glass fiber/epoxy, and T300/QY8911. The results indicate that the proposed model has higher fitting goodness than the existing models and can more accurately describe the residual stiffness degradation law during the fatigue damage of composite laminates.

Key words

wind turbine blades / composite materials / laminates / fatigue damage / stiffness

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Song Jiangbei, An Zongwen, Tang Ting, Ma Qiang, Huang Tao. DEGRADATION MODEL OF RESIDUAL STIFFNESS OF COMPOSITE MATERIALS UNDER CONSTANT AMPLITUDE LOAD[J]. Acta Energiae Solaris Sinica. 2022, 43(3): 382-387 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0562

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