Work

Fatigue strength assessment of welded steel fasteners using structural stress concept with consideration of the mounting pre-load

Year: 2025

Type: article

Abstract: The document presents a comprehensive investigation into the fatigue strength assessment of welded fasteners, specifically bolts and nuts, used in various engineering applications. A fatigue strength assessment approach using a structural stress concept is established, accounting for the influence of mounting pre-loads and residual stresses from the welding process. With the developed approach, the fatigue strength of all investigated variants can be assessed with a scatter of 1:2. The experimental investigations showed that an early decrease in pre-load forces negatively affects the fatigue strength. While pre-load forces can enhance fatigue strength, a reduction in pre-load during service loading must be avoided to ensure a safe life.

Source: Welding in the World

DOI: 10.1007/s40194-025-02018-1

Authors: A. Jöckel, J. Baumgartner, B. Möller, M. Timmermann, H. T. Beier, P. Yadegari

Institutions: Fraunhofer Institute for Structural Durability and System Reliability, Technische Universität Darmstadt

Language: English

Topic: Engineering Structural Analysis Methods

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,290

Funder: Fraunhofer-Gesellschaft