Investigation of the Influence of Radius and Corner Position on the Residual Stress Distribution in the Vicinity of the Repaired Region via Directed Energy Deposition by using Finite Element Analysis

서지정보

· 발행기관 : 한국기계가공학회
· 수록지 정보 : 한국기계가공학회지 / 20권 / 7호 / 33 ~ 40페이지
· 저자명 : 알리예브 알리술탄, 이광규, 안동규

초록

Current industrial flow is directed toward reducing the usage of raw materials by reusing parts, which is referredto as a circular economy (CE). Repair is one of the most value-added approaches in CE, which can be efficientlyaccomplished via additive manufacturing. The repair technology of metallic parts via the directed energy depositionprocess, which includes the selective removal and redeposition of damaged regions of metallic parts. Residual stresscharacteristics depend on the shape of the part and the shape of the redeposition region. The objective of this studyis to investigate the effects of the radius and corner position of the substrate on the residual stresses for repair byusing finite element analysis (FEA). The residual stress distribution of the 45° angle groove at the edge of thecircular shape models on the outer and inner radii was analytically investigated. The analysis was accomplishedusing SYSWELD software by applying a moving heat source with defined material properties and cooling conditionsintegrated into the FEA model. The results showed a similar pattern of concentrated stress distribution for all modelsexcept the 40-mm and 60-mm radii, for which the maximum stress locations were different. The maximum residualstresses are high but lower than the yield strength, suggesting the absence of cracks and fractures due to residualstresses.

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