Fatigue life prediction of polymer matrix composites containing initial delamination using thermography

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing Pub Date : 2025-02-27 DOI:10.1016/j.polymertesting.2025.108751

Amir Mohammad Feizi, Fathollah Taheri-Behrooz

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Abstract

This study investigates the effect of initial delamination on the fatigue behavior and lifespan of composite laminates made of woven glass fabric and epoxy resin. The primary objective is to evaluate the influence of initial delamination on parameters such as fatigue limit, stiffness degradation, and temperature variations using infrared thermography. To investigate the effect of delamination, the specimens were fabricated in three categories: standard, symmetric delamination, and asymmetric delamination. Analysis of thermal data and mechanical results revealed that initial delamination reduced approximately 76.8 % in fatigue life and 15.8 % in fatigue limit. Additionally, specimens with initial delamination exhibited faster stiffness degradation and higher temperature rise, indicating accelerated crack propagation and greater stress concentration. A fatigue life prediction model based on entropy generation and thermal data was developed for both standard and delaminated specimens, demonstrating satisfactory accuracy. The findings of this research can enhance the design and performance of composite structures by improving safety and operational efficiency through non-destructive monitoring and fatigue life prediction.

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热成像技术预测含初始脱层聚合物基复合材料疲劳寿命

研究了初始分层对玻璃织物与环氧树脂复合材料层合板疲劳性能和寿命的影响。主要目的是利用红外热成像技术评估初始分层对疲劳极限、刚度退化和温度变化等参数的影响。为了研究脱层的影响，将样品分为标准、对称和不对称三种类型。热数据和力学结果分析表明，初始分层使疲劳寿命降低了76.8%，疲劳极限降低了15.8%。初始分层试样刚度退化更快，温升更高，表明裂纹扩展加速，应力集中更大。建立了基于熵生成和热数据的标准和分层试样疲劳寿命预测模型，并取得了满意的精度。研究结果可以通过无损监测和疲劳寿命预测，提高复合材料结构的安全性和使用效率，从而提高复合材料结构的设计和性能。

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来源期刊

Polymer Testing 工程技术-材料科学：表征与测试

CiteScore

10.70

自引率

5.90%

发文量

328

审稿时长

44 days

期刊介绍： Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.