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Microscopic Analysis of Effect of Shot Peening on Corrosion Fatigue Behavior of Aluminum Alloy (알루미늄합금 재료의 부식피로거동에 미치는 쇼트피닝 효과에 대한 미시적 분석)

Kim, Jong-Cheon;Cheong, Seong-Kyun
- Transactions of the Korean Society of Mechanical Engineers A
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- v.36 no.11
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- pp.1381-1389
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- 2012
The object of this study considers corrosion fatigue improvement of 7075-T6 aluminum by using shot peening treatment on 3.5% NaCl solution at room temperature. Aluminum alloy is generally used in aerospace structural components because of the light weight and high strength characteristics. Many studies have shown that an aluminum alloy can be approximately 50% lighter than other materials. Mostly, corrosion leads to earlier fatigue crack propagation under tensile conditions and severely reduces the life of structures. Therefore, the technique to improve material resistance to corrosion fatigue is required. Shot peening technology is widely used to improve fatigue life and other mechanical properties by induced compressive residual stress. Even the roughness of treated surface causes pitting corrosion, the compressive residual stress, which is induced under the surface layer of material by shot peening, suppresses the corrosion and increases the corrosion resistance. The experimental results for shot peened specimens were compared with previous work for non treated aluminum alloy. The results show that the shot peening treatment affects the corrosion fatigue improvement of aluminum alloys and the induced compressive residual stress by shot peening treatment improves the resistance to corrosion fatigue.
https://doi.org/10.3795/KSME-A.2012.36.11.1381 인용 PDF KSCI

Self-healing Engineering Materials: II. Inorganic Materials (자기치유 공학재료: II. 무기재료)

Kim, Min-Hee;Kang, Dong-Eun;Yoon, Ji-Hwan;Choi, Eun-Ji;Shim, Sang-Eun;Yun, Ju-Ho;Kim, Il
- Clean Technology
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- v.17 no.2
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- pp.85-96
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- 2011
Self-healing materials are a class of smart materials that have the structurally incorporated ability to repair damage caused by mechanical usage over time. A material (polymers, ceramics, metals, etc.) that can intrinsically correct damage caused by normal usage could lower production costs of a number of different industrial processes through longer part lifetime, reduction of inefficiency over time caused by degradation, as well as prevent costs incurred by material failure. The recent announcement from Nissan on the commercial release of scratch healing paints for use on car bodies has gained public interest on such a wonderful property of materials. This article is a second part of healing materials dealing with inorganic engineering materials such as metals, ceramics, and concrete. The healing mechanisms developed for the inorganic materials are to be discussed with the future prospect.
https://doi.org/10.7464/ksct.2011.17.2.085 인용 PDF KSCI