基于声发射和粒子流探测灰铸铁压缩过程中的内部损伤

IF 2.8 4区 工程技术 Q2 ENGINEERING, CHEMICAL Processes Pub Date : 2024-09-04 DOI:10.3390/pr12091893
Zhen Li, Zhao Lei, Sheng Xu, Hengyang Sun, Bin Li, Zhizhong Qiao
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引用次数: 0

摘要

灰口铸铁在受损时会以应力波的形式释放能量。为了分析灰口铸铁在单轴压缩下物理和机械性能的演变以及声发射特性,我们以不同的速率(0.5、1 和 2 mm/s)采集声发射信号。结合载荷-时间曲线,使用参数 RA-AF 关联分析方法对损伤模式进行了识别和分类。结果表明加载速率对灰铸铁试样的强度、变形、声发射(AE)和能量演化的影响。声发射计数与工程应力-应变响应一致。为了更好地说明灰铸铁从内部微观结构到宏观外观的整个失效过程,采用了 X 射线衍射 (XRD) 和光学显微镜 (OM) 对材料的内部微观结构特征进行定性和定量分析。利用粒子流软件 PFC2D 6.00.30 晶粒模型(GBM)构建了灰铸铁的等效晶体模型,以模拟单轴压缩声发射试验。根据室内试验结果对精细参数进行校准,确保了与数值模拟结果的良好一致性。声发射动态监测了压缩过程,而离散元粒子流软件则进一步分析了从内到外的整个破坏过程。它为研究灰铸铁等金属材料的裂纹扩展提供了一种新的研究方法和思路。
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Probing Internal Damage in Grey Cast Iron Compression Based on Acoustic Emission and Particle Flow
Grey cast iron releases energy in the form of stress waves when damaged. To analyse the evolution of the physical and mechanical properties and acoustic emission characteristics of grey cast iron under uniaxial compression, acoustic emission signals were collected at different rates (0.5, 1, and 2 mm/s). Combined with load-time curves, damage modes were identified and classified using the parametric RA-AF correlation analysis method. The results indicate the loading rate effects on the strength, deformation, acoustic emission (AE), and energy evolution of grey cast iron specimens. The acoustic emission counts align with the engineering stress–strain response. To better illustrate the entire failure process of grey cast iron, from its internal microstructure to its macroscopic appearance, X-ray diffraction (XRD) and optical microscopy (OM) were employed for qualitative and quantitative analyses of the material’s internal microstructural characteristics. The equivalent crystal model of grey cast iron was constructed using a Particle Flow Software PFC2D 6.00.30 grain-based model (GBM) to simulate uniaxial compression acoustic emission tests. The calibration of fine parameters with indoor test results ensured good agreement with numerical simulation results. Acoustic emission dynamically monitors the compression process, while discrete element particle flow software further analyses the entire damage process from the inside to the outside. It provides a new research method and idea for the study of crack extension in some metal materials such as grey cast iron.
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来源期刊
Processes
Processes Chemical Engineering-Bioengineering
CiteScore
5.10
自引率
11.40%
发文量
2239
审稿时长
14.11 days
期刊介绍: Processes (ISSN 2227-9717) provides an advanced forum for process related research in chemistry, biology and allied engineering fields. The journal publishes regular research papers, communications, letters, short notes and reviews. Our aim is to encourage researchers to publish their experimental, theoretical and computational results in as much detail as necessary. There is no restriction on paper length or number of figures and tables.
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