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http://dx.doi.org/10.5762/KAIS.2019.20.10.140

A Study on the Repair of Fatigue Damage at Large Cast Iron structure using Cold Joint Method  

Lee, Sung-Riong (Division of Materials and engineering, Kangwon National University)
Lee, Dong Jun (Division of Materials and engineering, Graduate School of Industry & Science, Kangwon National University)
Cho, Seok Swoo (Division of Mechanical Design Engineering, Kangwon National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.20, no.10, 2019 , pp. 140-148 More about this Journal
Abstract
Large cast iron structures are used in casings and pipes in shipsand chemical plants. Broken parts in the casings and pipescan result in failures even when stresses are below the yield strength of the part's materials. Fatigue failure of a large cast iron structure is inevitable due to the design constraints and low reliability of the material strength. A small structure can be repaired by welding, but a large structure cannot because it cannot be preheated slowly and uniformly. This study shows that a large structure can be repaired by a cold joint method using a crack repair screw. Large cast iron structures were manufactured by GC 300, and their design stress is below 3.5 MPa. The tensile strength on notched specimens repaired by crack repair screws was 8.2 MPa. Therefore, the safety factors of structures repaired by crack repair screws have a value above 2.3 and are considered to be high values.
Keywords
Large Cast Iron Structure; Fatigue Damage; Crack Repair Screw; Tensile Strength Test; Safety Factor;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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