不同拉伸速率下钢材损伤的声发射监测评价

发布时间：2018-05-12 06:34

本文选题：声发射检测 + 钢材　；参考：《振动与冲击》2017年07期

【摘要】：钢材已成为生产的基本材料,被广泛应用于各行业,目前还没有对其进行损伤动态监测的有效方法。采用声发射技术对钢材Q235在不同的拉伸速率下进行损伤动态监测试验研究,首先通过试验获取了不同拉伸速率时材料的弹性、屈服、强化、颈缩和断裂各个力学行为阶段声发射信号并提取各个特征参数;然后通过各个特征参数累积量历程图归一化曲线对钢材拉伸损伤过程进行评价,发现特征参数累积量历程图归一化曲线可以明显反映出钢材拉伸整体演变过程及各个力学行为阶段特征,并且随着拉伸速率的减小,在屈服阶段的结束端点出现更为明显的突增量,可作为表征屈服阶段和强化阶段的重要转折点。结合拉伸力学,对各个力学行为阶段声发射信号的产生机制和特征进行总结,可为钢材后期声发射信号源的产生机制以及后期损伤定量、寿命预测的研究提供参考了依据。
[Abstract]:Steel has become the basic material in production and has been widely used in various industries. At present, there is no effective method for dynamic damage monitoring. The dynamic damage monitoring test of steel Q235 at different tensile rates was carried out by acoustic emission technology. Firstly, the elasticity, yield and strengthening of the materials at different tensile rates were obtained. The acoustic emission signals and the characteristic parameters are extracted from the acoustic emission signals at different mechanical behavior stages of necking and fracture, and then the tensile damage process of steel is evaluated by the normalized curve of the cumulative history of each characteristic parameter. It is found that the normalized curve of cumulant history diagram of characteristic parameters can clearly reflect the whole evolution process of steel tensile and the characteristics of each stage of mechanical behavior, and with the decrease of drawing rate, The abrupt increment at the end of the yield stage can be used as an important turning point to characterize the yield stage and the strengthening stage. Combined with tensile mechanics, the generation mechanism and characteristics of acoustic emission signals in different mechanical behavior stages are summarized, which can provide a reference for the research on the generation mechanism of acoustic emission signal source in the later stage of steel products, the quantitative damage and life prediction of the later stage of steel products.
【作者单位】：南昌航空大学无损检测技术教育部重点实验室;无损检测与光电传感技术及应用国家地方联合工程实验室;江西省特种设备检验检测研究院鹰潭分院;
【基金】：国家自然科学基金项目(11264032;11374134) 江西省自然科学基金项目(20122BAB201024) 国家质检总局科技计划项目(2013ZJJZ180) 航空科学基金项目(2014ZD56007) 上海航天科技创新基金项目(SAST201364) 江西省教育厅科技项目(GJJ14530) 无损检测技术教育部重点实验室开放基金项目(ZD201429002)
【分类号】：TG142.15

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