The fatigue life estimate by the LEFM concept of the tube joints exposed to axial load

• Autorzy: Djoković J. M. , Nikolić R. R. , Bujňák J. , Hadzima B.
• Języki publikacji: EN

Abstrakty

EN

In the tube joints the crack growth usually appears along the weld’s edge, i.e. at the spot where the chord and the brace are connected. The semi-elliptical crack the most frequently develops from the initial flaw that originated during the welding. The abrupt change in the material’s structure and response to loading are increasing the normal stresses in the lateral tube at certain spots around the crossing of the main and lateral tubes, producing the “hot spot” stress. Sensitivity to fatigue depends on combination of the cyclic loading, initial defects, environmental influences and the “hot spot” stresses which are the result of the tube walls bending during the loading of the structure. The principles of the Linear Elastic Fracture Mechanics (LEFM) are applied in this paper to analysis of the crack propagation behavior of a thin tube joints. Influence of various parameters was investigated individually and independently, and the share of the fatigue crack growth and subsequently the working life of the welded joint were estimated.

Słowa kluczowe

EN

tube joints; fatigue life; LEFM; Paris' law

PL

złącza rurowe; trwałość zmęczeniowa; LEFM; prawo paryskie

• Wydawca: Komisja Inżynierii Budowlanej Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Roczniki Inżynierii Budowlanej
• Rocznik: 2017
• Tom: z. 17
• Strony: 35--41
• Opis fizyczny: Bibliogr. 9. poz., rys., wykr.

Twórcy

autor

Djoković J. M.

• University of Belgrade, Technical Faculty of Bor, Bor, Serbia

autor

Nikolić R. R.

• University of Žilina, Research Center, Žilina, Slovakia
• University of Kragujevac, Faculty of Engineering, Kragujevac, Serbia

autor

Bujňák J.

• University of Žilina, Faculty of Civil Engineering, Žilina, Slovakia

autor

Hadzima B.

• University of Žilina, Research Center, Žilina, Slovakia

Bibliografia

• [1] Atzori, B., Lazzarin, P., Tovo, R.: From the local stress approach to fracture mechanics: a comprehensive evaluation of the fatigue strength of welded joints, Fatigue and Fracture of Engineering Materials and Structures, 22 (1999), 369-382.
• [2] Motarjemi, A.K., Kokabi, A.H., Ziaie, A., Manteghi, S., Burdekin, F.M.: Comparison of the stress intensity factor of T and cruciform welded joints with different main and attachment plate thickness, Engineering Fracture Mechanics, 65 (2000), 55-66.
• [3] Lee, C.H., Chang, K.H., Jang, G.C., Lee, C.Y.: Effect of weld geometry on the fatigue life of non-load-carrying fillet welded cruciform joints, Engineering Failure Analysis, 16 (2009), 849-855.
• [4] Baik, B., Yamada, K., Ishikawa, T.: Fatigue crack propagation analysis for welded joint subjected to bending, International Journal of Fatigue, 33 (2011), 746-758.
• [5] Chattopadhyay, A., Glinka, G., El-Zein, M., Qian, J., Formas, R.: Stress analysis and fatigue of welded structures, Welding in the World, 55, 7-8, (2011), 2-21.
• [6] Shen W., Choo, Y.S.: Stress intensity factor for a tubular T-joint with grouted chord, Engineering Structures, 35 (2011), 37-47.
• [7] Carpinteri, A., Ronchei, C., Vantadori, S.: Stress intensity factors and fatigue growth of surface cracks in notched shells and round bars: two decades of research work, Fatigue and Fracture of Engineering Materials and Structures, 36 (2013), 1164-1177.
• [8] Hobbacher, A.: Stress intensity factors of welded joints, Engineering Fracture Mechanics, 46 (1993), 173-182.
• [9] Paris, P., Erdogan, F.: A Critical Analysis of Crack Propagation Laws, Journal of Basic Engineering, D85 (1963), 528-534.

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).