A residual stress generated in the steel structure is broadly categorized into initial residual stress during manufacturing steel material, welding residual stress caused by welding, and heat treatment residual stress by heat treatment. Initial residual stresses induced during the manufacturing proc...
A residual stress generated in the steel structure is broadly categorized into initial residual stress during manufacturing steel material, welding residual stress caused by welding, and heat treatment residual stress by heat treatment. Initial residual stresses induced during the manufacturing process is combined with welding residual stress or heat treatment residual stress, and remained as a final residual stress. Because such final residual stress affects the safety and strength of the structure, it is of utmost importance to measure or predict the magnitude of residual stress, and to apply this point on the design of the structure. In this study, the initial residual stress of steel structures having thicknesses of 25 mm and 70 mm during manufacturing was measured in order to investigate initial residual stress (hereinafter, referred to as initial stress). In addition, thermal elastic plastic FEM analysis was performed with this initial condition, and the effect of initial stress on the welding residual stress was investigated. Further, the reliability of the FE analysis result, considering the initial stress and welding residual stress for the steel structures having two thicknesses, was validated by comparing it with the measured results. In the vicinity of the weld joint, the initial stress is released and finally controlled by the weld residual stress. On the other hand, the farther away from the weld joint, the greater the influence of the initial stress. The range in which the initial stress affects the weld residual stress was not changed by the initial stress. However, in the region where the initial stress occurs in the compressive stress, the magnitude of the weld residual compressive stress varies with the compression or tension of the initial stress. The effect of initial stress on the maximum compression residual stress was far larger when initial stress was considered in case of a thickness of 25 mm with a value of 180 MPa, while in case of thickness at 70 mm, it was 200 MPa. The increase in compressive residual stress is almost the same as the initial stress. However, if initial stress was tensile, there was no significant change in the maximum compression residual stress.
A residual stress generated in the steel structure is broadly categorized into initial residual stress during manufacturing steel material, welding residual stress caused by welding, and heat treatment residual stress by heat treatment. Initial residual stresses induced during the manufacturing process is combined with welding residual stress or heat treatment residual stress, and remained as a final residual stress. Because such final residual stress affects the safety and strength of the structure, it is of utmost importance to measure or predict the magnitude of residual stress, and to apply this point on the design of the structure. In this study, the initial residual stress of steel structures having thicknesses of 25 mm and 70 mm during manufacturing was measured in order to investigate initial residual stress (hereinafter, referred to as initial stress). In addition, thermal elastic plastic FEM analysis was performed with this initial condition, and the effect of initial stress on the welding residual stress was investigated. Further, the reliability of the FE analysis result, considering the initial stress and welding residual stress for the steel structures having two thicknesses, was validated by comparing it with the measured results. In the vicinity of the weld joint, the initial stress is released and finally controlled by the weld residual stress. On the other hand, the farther away from the weld joint, the greater the influence of the initial stress. The range in which the initial stress affects the weld residual stress was not changed by the initial stress. However, in the region where the initial stress occurs in the compressive stress, the magnitude of the weld residual compressive stress varies with the compression or tension of the initial stress. The effect of initial stress on the maximum compression residual stress was far larger when initial stress was considered in case of a thickness of 25 mm with a value of 180 MPa, while in case of thickness at 70 mm, it was 200 MPa. The increase in compressive residual stress is almost the same as the initial stress. However, if initial stress was tensile, there was no significant change in the maximum compression residual stress.
* AI 자동 식별 결과로 적합하지 않은 문장이 있을 수 있으니, 이용에 유의하시기 바랍니다.
문제 정의
However, these studies are mixed in the initial stress and the welding residual stress, and it is unclear how the initial stress affects the welding residual stress. Therefore, it is necessary to study the effect of the initial stress on the magnitude and influence range to welding residual stress.
가설 설정
4) The range in which the initial stress affects the weld residual stress was not changed by the initial stress. However, in the region where the initial stress occurs in the compressive stress, the magnitude of the weld residual compressive stress varies with the compression or tension of the initial stress.
제안 방법
In this study, in order to investigate the effect of initial stress induced during the manufacturing of steel material on the welding residual stress, initial stress was measured and analyzed for steel plates having a thickness of 25 mm and 70 mm. Thermal elastic-plastic FEM analysis was performed by setting initial condition as measured initial stresses to investigate the effect of initial stress on the welding residual stress.
In this study, in order to investigate the effect of initial stress induced during the manufacturing of steel material on the welding residual stress, initial stress was measured and analyzed for steel plates having a thickness of 25 mm and 70 mm. Thermal elastic-plastic FEM analysis was performed by setting initial condition as measured initial stresses to investigate the effect of initial stress on the welding residual stress. Further, two types of initial stresses and welding residual stresses were measured using neutron method and FE results compared with measured results in order to validate the reliability of FE analysis.
Thermal elastic-plastic FEM analysis was performed by setting initial condition as measured initial stresses to investigate the effect of initial stress on the welding residual stress. Further, two types of initial stresses and welding residual stresses were measured using neutron method and FE results compared with measured results in order to validate the reliability of FE analysis.
Initial stresses were measured for the flat plates having a thickness of 25 mm and 70 mm to validate the effect of initial stress on the welding residual stress, and the measured initial stresses were reproduced with the FE analysis. The specimen with a thickness of 25 mm had a width of 280 mm and length of 100 mm, while the specimen with a thickness of 70 mm had a width of 400 mm, and length of 200 mm.
In order to investigate the effect of the initial stress generated during the manufacturing of steel material, initial stress for the material having a thickness of 25 mm and 70 mm were measured. Thermal elastic plastic FE analysis for butt welding was performed with the initial stress obtained as above as an initial condition.
1) Initial stress which occurred during the manufacturing of steel material was measured, and the cooling process which was similar to the manufacturing process of the steel was performed through thermal elastic plastic FE analysis. The results were well-matched with the results obtained by the neutron method.
Residual stress was measured using a neutron method in order to validate the results obtained by thermal elastic plastic FE analysis, while the experiment result was compared with the FE analysis result. The reliability for the measurement of the neutron method is mentioned in detail in the published reference Jiang et al.
이론/모형
, 1986). In this study, neutron method was used to measure internal residual stress. The above studies were carried out on the effect of initial stress and welding residual stress on the structure.
1) Initial stress which occurred during the manufacturing of steel material was measured, and the cooling process which was similar to the manufacturing process of the steel was performed through thermal elastic plastic FE analysis. The results were well-matched with the results obtained by the neutron method.
성능/효과
7. The results are well-matched with the measured results in both specimens having thicknesses of 25 mm and 70 mm. From the above results, the measured initial stress could be reproduced through thermal elasticeplastic FE analysis.
2) Thermal elastic plastic FE analysis and measurement result by neutron method revealed that initial stresses near the welding joint was re-melted by the welding, and was finally governed by the welding residual stress. However, initial stress was more dominant as distanced from the welding joint.
3) The effect of initial stress on the maximum compression residual stress was far larger when initial stress was considered in case of a thickness of 25 mm with a value of 180 MPa, while in case of thickness at 70 mm, it was 200 MPa. The increase in compressive residual stress is almost the same as the initial stress.
후속연구
They reported that the shape and magnitude of the initial deformation affected welding deformation rather than initial stress, which was generated symmetrically. However, a detailed research was not executed on the relationship between initial stress and welding deformation.
참고문헌 (35)
An, G.B. (Ed.), 2011. The Proceedings of the Twenty-first (2011) International Offshore and Polar Engineering Conference; 2011 June 19-24; Maui.
An, Gyu Baek, Woo, Wanchuck, Park, Jeong-Ung, 2014. Brittle crack-arrest fracture toughness in a high heat-input thick steel weld. Int. J. Fract. 185 (1-2), 179-185.
Birkholz, M., Genzel, C., Jung, T., 2004. X-ray diffraction study on residual stress and preferred orientation in thin titanium films subjected to a high ion f lux during deposition. J. Appl. Phys. 96, 7202.
Brust, F.W., Dong, P., Zhang, J., Cao, Z., Yang, Y.P., Hong, J.K., 1998. Weld Process Modeling and It's Importance in a Manufacturing Environment (No. 981510). SAE Technical Paper.
Chounga, Joonmo, Nama, Ji-Myung, Tayyarb, Gokhan Tansel, 2014. Residual ultimate strength of a very large crude carrier considering probabilistic damage extents. Int. J. Nav. Archit. Ocean Eng. 6 (1), 14-26.
Dean, D., Shoichi, K., 2010. Numerical simulation of residual stresses induced by laser beam welding in a SUS316 stainless steel pipe with considering initial residual stress influences. Nucl. Eng. Des. 240 (2010), 68-695.
Dong, P., Cahill, P., Yang, Z., Chen, X.L., Mattei, N.J., 2004. Plate residual stress effects on dimensional accuracy in thermal cutting. J. Ship Prod. 20 (4), 245-255.
Fuchs, Henry Otten, Stephens, I., 1980. Metal Fatigue in Engineering. John Wiley & Sons, NY.
Haagensen, P.J., Maddox, S.J., 1995. IIW Recommendations on Post Weld Improvement of Steel and Aluminium Structures. IIW Doc. XIII-2200r1-07, 2008. -Tig dressing. Collaborative test program on improvement techniques.
Haagensen, P.J.,Maddox, S.J., 2001. Specifications forWeldToe Improvement by BurrGrinding, Tig Dressing andHammer Peening for TransverseWelds. IIW Commission XII-Working Group 2, WG2. International Institute of Welding.
Hansen, A.V., Agerskov, H., Bjornbak-Hansen, J., 2005. Improvement of Fatigue Life of Welded Structural Components by Grinding, IIW Doc. XIII-2051-05, 2005.
Jeom Kee, Paik, Thayamballi, Anil K., Kim, Do Hyung, 1999. An analytical method for the ultimate compressive strength and effective plating of stiffened panels. J. Constr. Steel Res. 49 (1), 43-68.
Jiang, W., Woo, W., An, G.B., Park, J.U., 2013. Neutron diffraction and finite element modeling to study the weld residual stress relaxation induced by cutting. Mater. Des. 51, 415-420.
Kang, S.W., Kim, M.H., Choi, J.Y., Kim, W.S., Paik, Y.M., 2006. A study on the fatigue strength improvement using weld toe burr grinding. J. KWS 24 (2), 150-155.
Kim, H.J., Bae, K.Y., 1991. Cutting camber of TMCP steel plates. J. Korean Weld. Soc. 9 (1), 9-15.
Kim, Seong-Min, Kim, Myung-Hyun, 2015. Incorporating mesh-insensitive structural stress into the fatigue assessment procedure of common structural rules for bulk carriers. Int. J. Nav. Archit. Ocean Eng. 7 (1), 0-24.
Luo, Y., 1997. Description of Inherent Strain and its Application to Prediction of Welding Deformation and Residual Stress under Multi-pass Welding. Doctoral Thesis. Osaka University.
Mahmoudi, A.H., Hossain, S., Pavier, M.J., Truman, C.E., Smith, D.J., 2009. A new procedure to measure near yield residual stresses using the deep hole drilling technique. Exp. Mech. 49 (4), 595-604.
McClung, R.C., 2007. A literature survey on the stability and significance of residual stresses during fatigue. Fatigue & Fract. Eng. Mater. Struct. 30 (3), 173-205.
Murakawa, H., Luo, Y., Ueda, Y., 1996. Prediction of welding deformation and residual stress by elastic FEM based on inherent strain (first report) mechanism of inherent strain production. J. Soc. Nav. Arch. Jpn. 180, 739-751.
Okido, S., Hayashi, M., Tanaka, K., Akinawa, Y., Minakawa, N., Mori, Y., April 1999. Measurement of residual stress in textured Al alloy by neutron diffraction method. In: 7th International Conference on Nuclear Engineering(ICONE), Tokyo, Japan, pp. 19-23.
Park, Jeong-Ung, 1997. A Study on Prediction and Mechanism of Out-of-plane Deformation in Butt Joint with Initial Defects. Ph.D thesis. Osaka university.
Park, Jeong-Ung, et al., 2011. Development of fatigue life improvement technology of butt joints using friction stir processing. Adv. Mech. Eng. 6, 943476.
Park, Jeong-Ung, et al., 2014a. Residual stress measurement in an extra thick multi-pass weld using initial stress integrated inherent strain method. Mar. Struct. 39, 424-437.
Park, Jeong-Ung, et al., 2014b. Comparison of measured residual stress distributions in extra-thick butt welds joined by one-pass EGW and multipass FCAW. Adv. Mech. Eng. 6, 861247.
Real, PMM Vila, et al., 2004. The effect of residual stresses in the lateraltorsional buckling of steel I-beams at elevated temperature. J. Constr. Steel Res. 60 (3), 783-793.
Sicot, O., et al., 1999. Influence of experimental parameters on determination of residual stress using the incremental hole-drilling method. Compos. Sci. Technol. 64 (2), 171-180.
Smith, D.J., Bouchard, P.J., George, D., 2000. Measurement and prediction of residual stresses in thick-section steel welds. J. Strain Anal. Eng. Des. 35 (4), 287-305.
Statnikov, E.S., Muktepavel, V.O., Blomqvist, A., 2002. Comparison of ultrasonic impact treatment (UIT) and other fatigue life improvement methods. Weld. World 46, 28-39.
Tryfyakov, V.I., Mikheev, P.P., Kudryavtsev, Y.F., Reznik, D.N., 1993. Ultrasonic impact peening treatment of welds and its effect on fatigue resistance in air and seawater. In: Offshore Technology Conference, Paper OTC 7280.
Ueda, Y., Nakacho, K., Shimizu, T., 1986. Improvement of residual stresses of circumferential joint of pipe by heat-sink welding. J. Press. Vessel Technol. 108 (1), 14-23.
Ueda, Yukio, et al., 1994. FEM simulation of gas and plasma cutting with emphasis on precision of cutting (mechanics, strength & structural design). Trans. JWRI 23 (1), 93-102.
Uy, B., 1998. Local and post-local buckling of concrete filled steel welded box columns. J. Constr. Steel Res. 47 (1), 47-72.
Woo, W., An, G.B., Kingston, E.J., De Wald, A.T., Smith, D.J., Hill, M.R., 2000. Through-thickness distributions of residual stresses in two extreme heat-input thick welds: a neutron diffraction, contour method and deep hole drilling study. Acta Mater 61, 3564-3574.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.