Investigating the relationship between natural frequency and residual strength and stiffness of cross‐ply laminate under cyclic loading

IF 2.9 4区化学 Q2 POLYMER SCIENCE

Polymer International Pub Date : 2024-07-24 DOI:10.1002/pi.6682

Pouya Valizadeh, Ahad Zabett, Jalil Rezaeepazhand

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引用次数: 0

Abstract

Predicting the fatigue life of wind turbine rotor blades is a challenging and crucial engineering task. This study investigates the correlation between modal parameters and the degradation of residual strength and tensile modulus in the cross‐ply glass epoxy laminate [0/90]7 used in wind turbine blades under fatigue loading. The tensile and vibration characteristics were assessed, followed by constant amplitude fatigue tests at 35%, 43% and 55% of the ultimate tensile strength, with R = 0.1 and a frequency of 8 Hz. The modal analysis was performed on the cycled specimens at life fractions from 0.05 to 0.70 and residual modulus and strength were obtained. The results establish a well‐defined correlation between these residual mechanical properties and the natural frequency. Normalized residual strength, tensile modulus and natural frequency demonstrated similar behaviors during the fatigue life. An initial rapid decrease in the first tenth of the life fraction was observed, followed by minimal changes up to a life fraction of 0.7. The strong correlation between the first mode natural frequency and both the residual strength and the tensile E‐modulus provides a promising basis for developing accurate fatigue life prediction models for fiber‐reinforced composite structures. © 2024 Society of Chemical Industry.

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研究循环荷载下交叉层压板的固有频率与残余强度和刚度之间的关系

预测风力涡轮机转子叶片的疲劳寿命是一项具有挑战性的重要工程任务。本研究调查了风力涡轮机叶片中使用的交叉层玻璃环氧层压板 [0/90]7 在疲劳载荷下的模态参数与残余强度和拉伸模量退化之间的相关性。对拉伸和振动特性进行了评估，然后在极限拉伸强度的 35%、43% 和 55%（R = 0.1，频率为 8 Hz）下进行了恒幅疲劳试验。在 0.05 至 0.70 的寿命分率下，对循环试样进行了模态分析，并获得了残余模量和强度。结果表明，这些残余机械性能与固有频率之间存在明确的相关性。归一化残余强度、拉伸模量和固有频率在疲劳寿命期间表现出相似的行为。在寿命分数的前十分之一处观察到最初的快速下降，随后变化很小，直到寿命分数为 0.7。一模固有频率与残余强度和拉伸 E 模量之间的强相关性为开发纤维增强复合材料结构的精确疲劳寿命预测模型奠定了良好的基础。© 2024 化学工业协会。

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来源期刊

Polymer International 化学-高分子科学

CiteScore

7.10

自引率

3.10%

发文量

135

审稿时长

4.3 months

期刊介绍： Polymer International (PI) publishes the most significant advances in macromolecular science and technology. PI especially welcomes research papers that address applications that fall within the broad headings Energy and Electronics, Biomedical Studies, and Water, Environment and Sustainability. The Journal’s editors have identified these as the major challenges facing polymer scientists worldwide. The Journal also publishes invited Review, Mini-review and Perspective papers that address these challenges and others that may be of growing or future relevance to polymer scientists and engineers.