Modeling the Evolution of Stresses Induced by Corrosion Damage in Metals
Modeling the Evolution of Stresses Induced by Corrosion Damage in Metals
复制标题
模拟金属腐蚀损伤引起的应力演变
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Ronak R. Patel
中科院分区：
文献类型：
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作者：
R. Pidaparti;Ronak R. Patel
腐蚀是航空航天工程结构中常用铝合金的最大破坏机制之一。裂纹通常从蚀坑/缺陷开始，目前，没有测量探头可以估计腐蚀蚀坑周围的应力环境。本文系统研究了2024-T3铝合金腐蚀损伤应力随时间的演化规律。在受控的电化学条件下对金属样品进行腐蚀实验，并使用AFM技术对表面进行成像。一个计算程序，开发调查的应力腐蚀损伤/坑使用AFM图像，CAD和有限元分析。分析还进行了腐蚀试样弯曲和拉伸载荷下，以了解如何加载影响诱导应力。结果表明，由于金属试样的不规则性和随机性，腐蚀表面的应力分布和水平发生了变化。结果还表明，应力最初增加，并达到一个平台，随着腐蚀时间的增加，可能是负责失败（裂纹萌生）的金属。
Corrosion is one of the most damaging mechanisms in aluminum alloys commonly used in aerospace engineering structures. Cracks usually initiate from the pits/defects, and currently, there are no measurement probes that can estimate the stress environment around corrosion pits. In this article, a systematic study is conducted to investigate the evolution of corrosion-damage-induced stresses in aluminum alloy 2024-T3 as a function of time. Corrosion experiments were conducted on a metal sample under controlled electrochemical conditions and the surfaces were imaged using AFM techniques. A computational procedure was developed to investigate the stresses resulting from corrosion damage/pits using the AFM image, CAD, and finite element analysis. Analysis was also carried out on corroded specimens under bending and tension loadings in order to see how the loading affects the induced stresses. The results indicated that the stress distribution and levels on the corroded surface varied due to irregularities and randomness in the metal sample. The results also indicated that the stress initially increases and reaches a plateau with increasing corrosion time and may be responsible for failure (crack initiation) of the metals.