Energy evolution characteristics and failure mechanism of coal confined by CFRP jackets subjected to different loading rates

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Polymer Testing Pub Date : 2025-02-01 DOI:10.1016/j.polymertesting.2025.108723

Qingwen Li , Mengjiao Xu , Wenxia Li , Chuangchuang Pan , Mengmeng Yu

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Abstract

To reveal the improvement effects of Carbon fiber reinforced polymer (CFRP) jackets on the strength and deformation characteristics of coal samples, and the energy transformation mechanism during the failure process of coal samples under different loading rates. In this study, uniaxial compression tests were conduct on 28 coal samples, the results indicated that both the loading rate and the number of CFRP layers significantly influenced the energy evolution process of the coal samples. The total energy growth ratio of coal samples confined by single and double layer of CFRP jackets ranging from 11.86 to 23.46 and 32.002–56.066, respectively, with the total energy at failure of the double layer samples being 1.8 times that of the single layer ones. The number of CFRP layers significantly enhances the total energy at the peak point and its growth ratio of the coal samples. At the minimum (maximum) loading rate, the growth ratio of the dissipation energy rate at the peak point decreases with the increase of CFRP layers. Additionally, the value at the maximum rate is approximately 6.03–8.87 times greater than that at the minimum rate. The elastic energy consumption ratio exhibited a ‘fishhook-shaped’ trend as axial deformation increased. The use of CFRP jackets can effectively improve the energy storage mechanism of coal samples. Therefore, studying the energy dissipation and failure behavior of CFRP confined coal samples subjected to different loading rates is crucial for reducing the risk of accidents caused by coal pillar instability.

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不同加载速率下CFRP夹套约束煤的能量演化特征及破坏机制

揭示碳纤维增强聚合物（CFRP）夹套对煤样强度和变形特性的改善作用，以及不同加载速率下煤样破坏过程中的能量转化机理。本研究对28个煤样进行了单轴压缩试验，结果表明，加载速率和CFRP层数对煤样的能量演化过程均有显著影响。单层和双层CFRP夹套约束下煤样总能量增长比分别为11.86 ~ 23.46和32.002 ~ 56.066，双层煤样破坏总能量是单层煤样破坏总能量的1.8倍。CFRP层数显著提高了煤样峰值总能量及其增长比。在最小（最大）加载速率下，峰值点耗散能率的增长率随CFRP层数的增加而减小。此外，最大速率下的值约为最小速率下的6.03-8.87倍。随着轴向变形量的增大，弹性能耗比呈“鱼钩形”趋势。使用CFRP夹套可以有效改善煤样的储能机制。因此，研究不同加载速率下CFRP约束煤样的能量耗散和破坏行为，对于降低煤柱失稳事故风险至关重要。

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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.