Development of a Method for Determining the Residual Life of Structural Elements with Cracks Under the Action of Load and Corrosive Environment, as well as the Application of Corrosion Inhibitors to Enhance It
IF 1.1 4区 材料科学Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
O. Andreykiv, I. Dolinska, S. Nastasiak, N. Zviahin
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引用次数: 0
Abstract
A developed method for determining the lifespan of structural elements with large-scale cracks of complex geometry under the influence of long-term static loads and corrosive environments. The method is based on an appropriate computational model, which relies on the first law of thermodynamics for the elementary act of local failure (crack propagation), some fundamental principles of physical chemistry, as well as the basic principles of fracture mechanics. The advantages of this method over existing ones are substantiated. The application of the method is demonstrated through examples involving the determination of the residual life of such structural elements as torsion and a pipe with small cracks made of 45KhN2MFA steel (tempered at 470 K and 725 K) under the influence of long-term static loading and distilled water. As the cracks are considered small, we have constructed a computational model in terms of deformation parameters, including a well-known counterpart in fracture mechanics, crack opening at the crack tip δt. At the same time, based on available experimental data from the literature, it is substantiated that the application of existing linear fracture mechanics methods in stress intensity factors KI for implementing the mentioned problems, the application of existing linear fracture mechanics methods is inappropriate. To determine the residual life of structural elements using this method, it is necessary to have kinetic diagrams in coordinates of the growth rate of small cracks and the crack opening at the crack tip, which means V ∼ δt. These diagrams are constructed here using the provided formulas for determining δt and diagrams are constructed here using the provided formulas and known experimental data for 45KhN2MFA steel under the influence of distilled water and static tension. Using the mentioned method, the residual lifespans of the torsion and the pipe were calculated under the influence of long-term static loading and distilled water. Additionally, the effectiveness of water solutions of well-known inorganic corrosion inhibitors on the residual lifespan of the mentioned structural elements was verified through calculations. It was found that the residual lifespan effectively characterizes the performance of corrosion inhibitors, which can be applied in engineering practice.
在长期静载荷和腐蚀环境的影响下,为确定具有复杂几何形状大尺度裂纹的结构元件的寿命而开发的方法。该方法基于一个适当的计算模型,该模型依赖于局部破坏(裂纹扩展)基本行为的热力学第一定律、物理化学的一些基本原理以及断裂力学的基本原理。与现有方法相比,该方法的优势得到了证实。该方法的应用实例包括:在长期静载荷和蒸馏水的影响下,确定结构元件的残余寿命,如扭转和有小裂缝的 45KhN2MFA 钢管(在 470 K 和 725 K 下回火)。由于裂缝较小,我们根据变形参数构建了一个计算模型,其中包括断裂力学中一个著名的对应参数--裂缝顶端的裂缝开度 δt。同时,根据文献中现有的实验数据,证实了在应力强度因子 KI 中应用现有的线性断裂力学方法来实现上述问题是不合适的。要使用该方法确定结构元件的残余寿命,必须要有小裂纹生长率和裂纹尖端裂纹张开坐标的动力学图,即 V ∼ δt。这些图表是利用所提供的 δt 确定公式绘制的,同时还利用所提供的公式和已知的实验数据绘制了 45KhN2MFA 钢在蒸馏水和静拉力影响下的图表。利用上述方法,计算了在长期静载荷和蒸馏水影响下,扭杆和管道的残余寿命。此外,还通过计算验证了知名无机缓蚀剂水溶液对上述结构元件残余寿命的影响。研究发现,残余寿命可以有效地表征缓蚀剂的性能,并可应用于工程实践中。
期刊介绍:
CORROSION is the premier research journal featuring peer-reviewed technical articles from the world’s top researchers and provides a permanent record of progress in the science and technology of corrosion prevention and control. The scope of the journal includes the latest developments in areas of corrosion metallurgy, mechanisms, predictors, cracking (sulfide stress, stress corrosion, hydrogen-induced), passivation, and CO2 corrosion.
70+ years and over 7,100 peer-reviewed articles with advances in corrosion science and engineering have been published in CORROSION. The journal publishes seven article types – original articles, invited critical reviews, technical notes, corrosion communications fast-tracked for rapid publication, special research topic issues, research letters of yearly annual conference student poster sessions, and scientific investigations of field corrosion processes. CORROSION, the Journal of Science and Engineering, serves as an important communication platform for academics, researchers, technical libraries, and universities.
Articles considered for CORROSION should have significant permanent value and should accomplish at least one of the following objectives:
• Contribute awareness of corrosion phenomena,
• Advance understanding of fundamental process, and/or
• Further the knowledge of techniques and practices used to reduce corrosion.