Application of a semianalytical strain assessment and multiaxial fatigue analysis to compare rolling contact fatigue in twin-disk and full-scale wheel/rail contact conditions
Artikel i vetenskaplig tidskrift, 2021

A semianalytical model is introduced to assess rolling contact fatigue problems in railway applications. The constitutive law is based on the nonlinear kinematic and isotropic hardening model of Chaboche–Lemaitre, which allows the cyclic elastoplastic strain under the contact surface to be evaluated. The much higher computational effectiveness in comparison with finite element (FE) analyses is quantified. The Dang Van multiaxial fatigue criterion is implemented to evaluate the rolling contact fatigue in the subsurface elastic region where cracking is relatively rare but more dangerous than surface cracks. The influence of the presence of sulfides in the wheel matrix in decreasing fatigue strength is also assessed by means of Murakami's approach. The model is used to compare conditions under small-scale twin-disk experiments to full-scale wheel/rail contact conditions. It is found that, for the same Hertzian pressure, the small-scale contact is more conservative in that it causes a deeper plasticized layer as compared with the elliptical full-scale contact. In the investigated cases, crack initiation is also not expected according to Dang Van criterion in neither of the studied contact conditions.

semianalytical model (SAM)

fatigue limit

finite element models (FEM)

shakedown

ratcheting

multiaxial fatigue

Författare

Nicola Zani

Universita degli Studi di Brescia

Magnus Ekh

Chalmers, Industri- och materialvetenskap, Material- och beräkningsmekanik

Anders Ekberg

Chalmers, Mekanik och maritima vetenskaper, Dynamik

Angelo Mazzù

Universita degli Studi di Brescia

Fatigue and Fracture of Engineering Materials and Structures

8756-758X (ISSN) 1460-2695 (eISSN)

Vol. In Press

Ämneskategorier

Teknisk mekanik

Annan materialteknik

Farkostteknik

DOI

10.1111/ffe.13595

Mer information

Senast uppdaterat

2021-11-10