PSI - Issue 48

Đorđe Đurđević et al. / Procedia Structural Integrity 48 (2023) 88 –95 Đurđević et al / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 15. Representation of experimental results for connecting lug U – stress field

5. Conclusion This paper presents results of stress and strain tests of structural elements with geometric discontinuities. Finite element method (FEM), as a numerical method, and the digital image correlation method, as an experiment, were used for tests. A static calculation was performed using FEM. Obtained stress values are practically equal in both software packages, „KOMIPS“ and „ABAQUS“, which proves that a good selection of the finite element mesh was made. The chosen mesh was used for the numerical analysis of the lug, which was later experimentally tested, with the same load. Stress values obtained by numerical analysis and experimental testing of connecting lug are given in Table 2. It can be seen that the values differ by only about 4%. Therefore, numerical results were verified by experimental testing.

Table 2. Comparative analysis of obtained stresses

Designation of con. lug

FEM Analysis  /MPa

Experiment  /MPa

U

248

259

It is shown here how the strain and equivalent stress can be reduced if material is removed. By drilling seven holes instead of three, the stress value was reduced by 10%. The conclusions obtained by examining this type of structures can be included in the process of designing new similar structures. The knowledges gained during the realization of this work can be directly applied to identify the behavior of real structures in their working conditions. References Antoni N., Gaisne F., 2011. Analytical modelling for static stress analysis of pin-loaded with bush fitting. Journal of Applied Mathematical Modelling 35, 1-21. Shi G., Shi Y., Wang Y., Bradford M., 2008. A. Numerical simulation of steel pretensioned bolted end - plate connections of different types and details. Engineering Structures 30, 2677-2686. Shun-Peng Z., Wen-Long Y., Jose A. F. O. C., Abilio M. P. J., Qingyuan W., 2022. Stress gradient effect in metal fatigue: Review and solution. Journal of Theoretical and Applied Fracture Mechanics 121, 103513 Bajić D., Momčilović N., Maneski T., Balać M., Kozak D., Ćulafić S., Numerical and experimental determination of stress conce ntration factor for a pipe branch model. Technical Gazzete. 24, 687 -692. Đurđević Đ., Đurđević A., Anđelić N., Petrović A., 2021. Numerical – experimental determination of stress and deformation stste in connection lugs. Structural integrity and life 21, 169-172. Maneski, T., 1998. Computer model ling and structure, In: Monography, Faculty of Mechanical Engineering, Belgrade. Software KOMIPS, Faculty of Mechanical Engineering, Belgrade Sedmak A.et al. 2012. Digital image correlation in experimental mechanical analysis. Structural integrity and lif e 12, 39- 42. Software ARAMIS, GOM, Germany