Fatigue Microcracks Detection and Assessment in High-Strength Marine Steel Using Nonlinear Ultrasonic Waves: Experimental and Numerical Investigation

IF 0.9 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
Caizheng Wu, Qin Wei, Yifeng Zhu, Haibin Wang, Mengchuan Hu, Lusha Xiang, Bo Liu, Zeyi Wei
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Abstract

Fatigue damage severely impairs high-strength marine steel performance, threatening the safety of ships and offshore engineering structures. Due to the abrupt nature of structural fatigue failures, early detection of fatigue microcracks is crucial for ensuring structural reliability. The detection of fatigue damage was experimentally and numerically investigated in AH36 marine steel using nonlinear ultrasonic technique. According to the distribution features of fatigue damage in marine steel, a three-dimensional finite element model is proposed to investigate the nonlinear ultrasonic method for the detection of randomly distributed fatigue microcracks. The microcrack distribution is much closer to the actual state of fatigue microcracks in metal than that of previous studies which used two-dimensional plane strain models with the individual crack or distributed cracks. The high-harmonic was induced by the contact behavior of crack surfaces. The results revealed that the relative nonlinear coefficient increases with higher microcrack number and length, but decreases with larger microcrack width. Additionally, the FE model, which closely approximates the actual distribution of fatigue microcracks in metallic materials, provides a new research avenue for a more comprehensive understanding the nonlinear interaction between ultrasonic waves and fatigue microcracks.

Abstract Image

利用非线性超声波检测和评估高强度船用钢中的疲劳微裂纹:实验和数值研究
疲劳损伤严重损害了高强度船用钢的性能,威胁着船舶和近海工程结构的安全。由于结构疲劳失效具有突发性,因此疲劳微裂纹的早期检测对于确保结构可靠性至关重要。利用非线性超声波技术对 AH36 船用钢疲劳损伤的检测进行了实验和数值研究。根据船用钢疲劳损伤的分布特征,提出了一种三维有限元模型,研究非线性超声波法检测随机分布的疲劳微裂纹。与之前使用二维平面应变模型的单个裂纹或分布式裂纹相比,该微裂纹分布更接近金属疲劳微裂的实际状态。高次谐波是由裂纹表面的接触行为引起的。研究结果表明,相对非线性系数随着微裂纹数量和长度的增加而增加,但随着微裂纹宽度的增加而减小。此外,该 FE 模型非常接近金属材料中疲劳微裂纹的实际分布情况,为更全面地了解超声波与疲劳微裂纹之间的非线性相互作用提供了新的研究途径。
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来源期刊
Russian Journal of Nondestructive Testing
Russian Journal of Nondestructive Testing 工程技术-材料科学:表征与测试
CiteScore
1.60
自引率
44.40%
发文量
59
审稿时长
6-12 weeks
期刊介绍: Russian Journal of Nondestructive Testing, a translation of Defectoskopiya, is a publication of the Russian Academy of Sciences. This publication offers current Russian research on the theory and technology of nondestructive testing of materials and components. It describes laboratory and industrial investigations of devices and instrumentation and provides reviews of new equipment developed for series manufacture. Articles cover all physical methods of nondestructive testing, including magnetic and electrical; ultrasonic; X-ray and Y-ray; capillary; liquid (color luminescence), and radio (for materials of low conductivity).
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