基于局部动态标准估算材料机械负载下的声发射源活性

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Strength of Materials Pub Date : 2024-05-07 DOI:10.1007/s11223-024-00625-9
O. V. Drozdov, Yu. M. Volkov
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引用次数: 0

摘要

评估声发射(AE)源的活动及其在材料和结构机械负载下的危害的最常用方法之一是使用局部动态标准。为了验证后者,在三点弯曲的静态加载条件下对玻璃纤维、刚玉耐火材料和钢等不同材料的试样进行了测试。我们开发了一个专门的 AE-Criterion 软件,根据局部动态标准,利用力系数和测试开始后的时间来确定 AE 参数,包括源活动的当前参数。考虑到材料加载过程中 AE 事件的多重性和随机性,建议在应用力参数和时间时分别确定 MS、MT 以及 AE 源活动程度指数 IAS 和 IAT 的平均值。通过对上述试样弯曲试验中获得的数据进行分析,并据此计算出声源活动度参数,结果表明在使用力因子时,指数 IAS 的值能够令人满意地反映这些材料的变形和断裂过程。研究结果表明,局部动态标准适用于诊断上述材料的变形和断裂过程。
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Estimation of the Acoustic Emission Sources Activity Under Mechanical Loading of Materials Based on the Local Dynamic Criterion

One of the most common ways to assess the activity of acoustic emission (AE) sources and their hazard under mechanical loading of materials and structures is to use the local-dynamic criterion. To verify the latter, specimens of various materials, namely fiberglass, corundum refractory, and steel, were tested under static loading during three-point bending. A special software AE-Criterion was developed to determine the AE parameters, including the current parameters of source activity, based on the local dynamic criterion using both the force factor and the time since the beginning of the test. Taking into account the multiplicity and stochastic nature of AE events during the loading of materials, it is proposed to determine the average values of MS, MT, and the values of the indices IAS and IAT of the activity degree of AE sources when applying the force parameter and time, respectively. The analysis of the data obtained during the bending tests of the above-mentioned specimens and, accordingly, the calculation of the parameters of source activity showed that the value of the index IAS, when using the force factor, satisfactorily reflects the deformation and fracture processes of these materials. The study’s results indicate the suitability of the local dynamic criterion for diagnosing the deformation and fracture processes of the above materials.

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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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