Machines. Technologies. Materials.
Vol. 15 (2021), Issue 8, pg(s) 316-318

MATERIALS

Investigation of the coalescence of twin coplanar semi-elliptical fatigue cracks in structural steel elements under cyclic loading

  • 1 Ternopil Ivan Puluj National Technical University, Ternopil, Ukraine

Abstract

The solution to the scientific task of identifying the fundamental laws of surface cracks development during their coalescence in the elements of steel structures under cyclic loading is presented in this article. A simulation model of coalescence of identical coplanar surface cracks has been developed. The model considers the solution to two problems: substantiation of the crack geometry during coalescence, and obtaining calculation formulas for estimating the stress intensity factors along a series of saddle-shaped contours. Based on the definition of stress intensity factors for contours modeling the gradual propagation of cracks in the coalescence zone using the finite elements method, the proposed model was tested to compare the calculated durability with experimental data.

Keywords

References

  1. Махненко В. И. Ресурс безопасной эксплуатации сварных соединений и узлов современных конструкций. – К.: Наукова думка, 2006. – 619 с.
  2. Альгин В.Б. Расчет мобильной техники: кинематика, динамика, ресурс. – Минск: Беларуская навука, 2014.– 271с.
  3. Пидгурский Н. Прогнозирование и обеспечение усталостной надежности несущих конструкций мобильных машин // Пидгурский Н., Рыбак Т., Сташкив Н., Попович П. / Международнен конгрес «Машиностротелни технологии» International congress “Mechanical engineering technologies’04” 2004, Varna, Bulgaria, Volume 6. – С.139 – 142.
  4. Myko la Pіdgurskyi, Yevgen Ripetskyi, and Ivan Pidgurskyi (2020). Research and simulation of load modes in the evaluation of mobile machines resource. AIP Conference Proceedings, 2020, 020064 (2018): 7p.
  5. Ted L. Anderson, Fracture Mechanics Fundamentals and Applications, Fourth ed., Boca Raton, CRC Press, 2017.
  6. Kai Lu, Yinsheng Li. Fatigue crack growth calculations for two adjacent surface cracks using combination rules in fitness-for-service codes / AIMS Materials Science, 2017, 4(2): 439-451.
  7. J.C. Newman, I.S. Raju An empirical stress-intensity factor equation for the surface crack. Engineering Fracture Mechanics. –Volume 15, Issues 1–2, 1981, 185 – 192.
  8. S. K. Patel, B. Dattaguru, K. Ramachandra, Multiple Interacting and Coalescing Semi-Elliptical Surface Cracks in Fatigue P. 1: FEA, SL, V. 3, N.1, (2010), 37 – 57.
  9. C.J. Bayley, R. Bell Parametric investigation into the coalescence of coplanar fatigue cracks, Int. J. of Fat., V. 21, I. 4, (1999), 355 – 360.
  10. B. Bezensek, J.W. Hancock, The re-characterisation of complex defects: Part I: Fatigue and ductile tearing, Eng. Fract. Mech. V. 71, I. 7 – 8, (2004), 981 – 1000.
  11. Pidgurskyi, M., Stashkiv, M., Pidgurskyi, І., Makar, A. (2020) Numerical investigation of stress intensity factors for surface cracks under coalescence. Procesy zmęczenia i mechanika pękania. Opole, 2020. – Vol. 536, 231 – 246.
  12. H.H. Lee. Finite Element Simulations with ANSYS Workbench 19, SDC Pub., 2019.

Article full text

Download PDF