Experiments for the Quantification of the Initial Stress State in UIC Parabolic Leaf Springs

• Type: Article in International Conference Proceedings Book
• Date: 2023

Authors

Gomes V.M.G. (Author) Other; M. J. Marques (Author) FEUP; Miguel Figueiredo (Author) FEUP; Correia J.A.F.O. (Author) FEUP; Batista A.C. (Author) Other; Rui Calçada (Author) FEUP; Abilio M P De Jesus (Author) FEUP

Conference proceedings International

Title: Procedia Structural Integrity

Pages: 142-148

2nd International Symposium on Risk Analysis and Safety of Complex Structures and Components, IRAS 2023

Belgrade, 2 April 2023 through 4 April 2023

Indexing

Scopus - 0 Citations

Other information

Authenticus ID: P-00Y-YCT

DOI: 10.1016/j.prostr.2023.07.140

Abstract (EN): Parabolic leaf springs applied in freight wagons are standardized by the International Union of Railways, UIC. According to the UIC, parabolic leaf springs must be stress peened after quenching and tempering in order to produce a compressive stress state on the surface to improve the fatigue strength. After heat and mechanical treatments, spring leaves are assembled. Due to distinct curvature radius of spring leaves, they are pre-stressed, introducing another type of initial stress state in the spring leaves. In order to quantify the initial stress state in UIC parabolic leaf springs, two types of experiments are performed. The stress relief method and the X-ray diffraction method are performed to analyze the assembling stresses and residual stresses by stress shot peening respectively. The superposition method is considered to estimate a corrected fatigue limit encompassing the material fatigue limit and the effect of the initial stress state. The results revealed that increases in the fatigue limit above 50% can be achieved.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6