3_2023_sen_4

Title of the article STUDY OF THE STRESS-STRAIN STATE OF THE MATERIAL AT THE CRACK TIP, LOCATED IN THE AREA OF THE STRUCTURAL CONCENTRATOR
Authors

TULIN Daniil E., Ph. D. Student, Peter the Great St. Petersburg Polytechnic University, Saint Petersburg, Russian Federation, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section MECHANICS OF DEFORMED SOLIDS
Year 2023
Issue 3(64)
Pages 37–42
Type of article RAR
Index UDK 624.014
DOI https://doi.org/10.46864/1995-0470-2023-3-64-37-42
Abstract The influence of the stress concentrator is studied due to the design features of the welded metal structure of a loader crane on the stress-strain state of the material in the fracture process zone. Within the framework of the research, a physical criterion using the basic mechanical properties of the material is applied. A normal tear-off crack is considered under uniaxial loading conditions. FEM analysis of T-joint and lap welded joint models, as creating the highest stress concentration in metal structures of loader cranes, is carried out. A comparative analysis of calculation results for models with a crack in the concentrator area and models with a crack in a smooth plate is performed. The influence of the concentrator and its several parameters on the stress stiffness at the crack tip is shown. A general averaged estimation of the concentrator influence on the material stress state in the fracture process zone is proposed. Recommendations on taking into account the presence of the concentrator in analytical calculations are given.
Keywords welded joint, crack, stress concentrator, welding defect, brittle fracture, stress stiffness, finite element method, strength criterion
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Bibliography
  1. Kryzhevich G.B. Integralnye kriterii razrusheniya v chislennykh raschetakh nizkotemperaturnoy prochnosti konstruktsiy morskoy tekhniki [Integral failure criteria in numerical lowtemperature strength calculations of marine facilities]. Transactions of the Krylov State Research Centre, 2018, no. 1(383), pp. 29–42 (in Russ.).
  2. Matvienko Yu.G. Modeli i kriterii mekhaniki razrusheniya [Fracture mechanics models and criteria]. Moscow, Fizmatlib Publ., 2006. 328 p. (in Russ.).
  3. Zhu X.K., Joyce J.A. Review of fracture toughness (G, K, J, CTOD, CTOA) testing and standardization. Engineering fracture mechanics, 2012, vol. 85, pp. 1–46. DOI: https://doi.org/10.1016/j.engfracmech.2012.02.001.
  4. Tanabe Y. Fracture toughness for brittle fracture of elastic and plastic materials. Materials transactions, 2013, vol. 54, iss. 3, pp. 314–318. DOI: https://doi.org/10.2320/matertrans.M2012348.
  5. Kornev V.M. Obobshchennyy dostatochnyy kriteriy prochnosti. Opisanie zony predrazrusheniya [Generalized sufficient strength criterion. Description of the fracture process zone]. Prikladnaya mekhanika i tekhnicheskaya fizika, 2002, vol. 43, no. 5, pp. 153–161 (in Russ.).
  6. Seweryn A. Brittle fracture criterion for structures with sharp notches. Engineering fracture mechanics, 1994, vol. 47, iss. 5, pp. 673–681. DOI: https://doi.org/10.1016/0013-7944(94)90158-9.
  7. Palombo M., Sandon S., De Marco M. An evaluation of size effect in CTOD-SENB fracture toughness tests. Procedia engineering, 2015, vol. 109, pp. 55–64. DOI: https://doi.org/10.1016/j.proeng.2015.06.207.
  8. Bažant Z.P., Jirásek M. Nonlocal integral formulations of plasticity and damage: survey of progress. Journal of engineering mechanics, 2002, vol. 128, iss. 11, pp. 1119–1149. DOI: https://doi.org/10.1061/(ASCE)0733-9399(2002)128:11(1119).
  9. Rabczuk T. Computational methods for fracture in brittle and quasi-brittle solids: state-of-the-art review and future perspectives. Applied mathematics, 2013, vol. 2013. DOI: https://doi.org/10.1155/2013/849231.
  10. Linkov A.M. Poterya ustoychivosti, kharakternyy lineynyy razmer i kriteriy Novozhilova–Neybera v mekhanike razrusheniya [loss of stability, characteristic length, and Novozhilov-Neuber criterion in fracture mechanics]. Izvestiya Rossiyskoy akademii nauk. Mekhanika tverdogo tela, 2010, no. 6, pp. 98–111 (in Russ.).
  11. Vasil’ev I.A., Sokolov S.A. Elastoplastic state of stress of a plate with a crack. Russian metallurgy (Metally), 2020, iss. 10, pp. 1065–1069. DOI: https://doi.org/10.1134/S0036029520100316.
  12. Sokolov S.A., Vasil’ev I.A., Grachev A.A. Mathematical model for the elastoplastic state of stress of the material at the crack tip. Russian metallurgy (Metally), 2021, iss. 4, pp. 347–350. DOI: https://doi.org/10.1134/S0036029521040315.
  13. Sokolov S.A., Tulin D.E. Modeling of elastoplastic stress states in crack tip regions. Physical mesomechanics, 2021, vol. 24, iss. 3, pp. 237–242. DOI: https://doi.org/10.1134/S1029959921030024.
  14. Sokolov S.A., Tulin D.E. Mathematical model of brittle fracture of a cracked part. Physical mesomechanics, 2022, vol. 25, iss. 1, pp. 72–79. DOI: https://doi.org/10.1134/S1029959922010088.
  15. Kopelman L.A. Osnovy teorii prochnosti svarnykh konstruktsiy [Fundamentals of the theory of strength of welded structures]. Saint Petersburg, Lan Publ., 2010. 457 p. (in Russ.).
  16. Sokolov S., Tulin D., Vasiliev I. Investigation of the size of the fracture process zone and the cleavage stress in cracked steel parts. Fatigue & fracture of engineering materials & structures, 2023, vol. 46, iss. 3, pp. 1159–1169. DOI: https://doi.org/10.1111/ffe.13927.
  17. Sokolov S., Tulin D. Effect of intrinsic residual stresses on the brittle fracture resistance of a welded joint. Russian metallurgy (Metally), 2023, iss. 4, pp. 51–57.