open access publication

Article, 2024

Misalignment factors to affect the fatigue of welded load-carrying joints

International Journal of Fatigue, ISSN 0142-1123, 1879-3452, Volume 178, Page 107996, 10.1016/j.ijfatigue.2023.107996

Contributors

Soligo, Marco [1] Campagnolo, Alberto 0000-0001-8685-6210 [1] Meneghetti, Giovanni 0000-0002-4212-2618 [1] Yıldırım, Halid Can 0000-0003-2040-120X (Corresponding author) [2]

Affiliations

  1. [1] University of Padua
    2. [NORA names: Italy; Europe, EU; OECD];
  2. [2] Aarhus University
    3. [NORA names: AU Aarhus University; University; Denmark; Europe, EU; Nordic; OECD]

Abstract

To assess the effects of misalignment on the weld fatigue, we present experimental fatigue test results of load- carrying cruciform joints which are subjected to axial variable amplitude loading. The welds were produced from steel AH36 grade and fatigue strength improved by high-frequently mechanical impact treatment. We identify several misalignment factors affecting the fatigue by considering the real and reference welded joint geometries. Our methodology includes proposals for the empirical calibration functions and local stress analyses by using the Structural Hot Spot Stress, Effective Notch Stress and Peak Stress Method. Additionally, we apply our methodology to other sixteen data sets which are extracted from the literature for load-carrying cruciform and butt welded joints subjected to constant amplitude loading. Finally, we present the resultant calibration functions with respect to corresponding fatigue test data.

Keywords

amplitude loading, analysis, butt-welded joints, calibration, calibration function, constant amplitude loading, cruciform, cruciform joints, data, data sets, effect, effect of misalignment, effective notch stress, empirical calibration function, experimental fatigue test results, factors, fatigue, fatigue strength, fatigue test data, fatigue test results, function, geometry, grade, high-frequency mechanical impact treatment, hot spot stress, impact treatment, joint geometry, joints, literature, load, load-carrying cruciform, load-carrying joints, local stress analysis, method, methodology, misalignment, misalignment factor, notch stress, peak, peak stress method, proposal, results, sets, steel, strength, stress, stress analysis, stress method, structural hot spot stress, structure, test data, test results, treatment, variable amplitude loading, weld fatigue, weld joint geometry, welding

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