Continuum mechanics fatigue model : Fatigue limits for out-of-phase combinations of normal and shear stress
(2026) 8th International Conference on Structural Integrity and Durability, ICSID 2025 In Procedia Structural Integrity 82. p.112-118- Abstract
The continuum mechanics fatigue model operates on state variables that are continuous in time, unlike cycle-counting-based methods that rely on deconstructing stress histories into a set of distinct cycles. This way, the continuum-based approach provides a modeling framework that, in principle, can handle arbitrary stress histories. Despite its successful application for a wide range of problems, the current formulations cannot fully capture the complexities of out-of-phase loading. The present work investigates this issue in further detail by considering cyclic stress histories induced by combinations of bending and torsion with various phase differences for infinite fatigue lifetimes. For mild steel, hard steel and duraluminum... (More)
The continuum mechanics fatigue model operates on state variables that are continuous in time, unlike cycle-counting-based methods that rely on deconstructing stress histories into a set of distinct cycles. This way, the continuum-based approach provides a modeling framework that, in principle, can handle arbitrary stress histories. Despite its successful application for a wide range of problems, the current formulations cannot fully capture the complexities of out-of-phase loading. The present work investigates this issue in further detail by considering cyclic stress histories induced by combinations of bending and torsion with various phase differences for infinite fatigue lifetimes. For mild steel, hard steel and duraluminum subjected to certain combinations of shear stress and normal stress with phase differences of 90 degrees, the model will overestimate the fatigue limit for some stress combinations. For a brittle cast iron, the observed fatigue limits are well captured when applying a generalized format that takes into account the effect of the shear stress fatigue limit.
(Less)
- author
- Tveit, Sigbjørn ; Ottosen, Niels Saabye LU and Reyes, Aase
- organization
- publishing date
- 2026
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- Continuum mechanics fatigue model, high-cycle fatigue, multiaxial, out-of-phase
- host publication
- Procedia Structural Integrity
- series title
- Procedia Structural Integrity
- volume
- 82
- pages
- 7 pages
- conference name
- 8th International Conference on Structural Integrity and Durability, ICSID 2025
- conference location
- Dubrovnik, Croatia
- conference dates
- 2025-09-16 - 2025-09-27
- external identifiers
-
- scopus:105039118384
- ISSN
- 2452-3216
- DOI
- 10.1016/j.prostr.2026.04.018
- language
- English
- LU publication?
- yes
- id
- afe37f0d-99e8-49b7-84ee-f094b59115d3
- date added to LUP
- 2026-07-10 13:49:39
- date last changed
- 2026-07-10 13:49:39
@inproceedings{afe37f0d-99e8-49b7-84ee-f094b59115d3,
abstract = {{<p>The continuum mechanics fatigue model operates on state variables that are continuous in time, unlike cycle-counting-based methods that rely on deconstructing stress histories into a set of distinct cycles. This way, the continuum-based approach provides a modeling framework that, in principle, can handle arbitrary stress histories. Despite its successful application for a wide range of problems, the current formulations cannot fully capture the complexities of out-of-phase loading. The present work investigates this issue in further detail by considering cyclic stress histories induced by combinations of bending and torsion with various phase differences for infinite fatigue lifetimes. For mild steel, hard steel and duraluminum subjected to certain combinations of shear stress and normal stress with phase differences of 90 degrees, the model will overestimate the fatigue limit for some stress combinations. For a brittle cast iron, the observed fatigue limits are well captured when applying a generalized format that takes into account the effect of the shear stress fatigue limit.</p>}},
author = {{Tveit, Sigbjørn and Ottosen, Niels Saabye and Reyes, Aase}},
booktitle = {{Procedia Structural Integrity}},
issn = {{2452-3216}},
keywords = {{Continuum mechanics fatigue model; high-cycle fatigue; multiaxial; out-of-phase}},
language = {{eng}},
pages = {{112--118}},
series = {{Procedia Structural Integrity}},
title = {{Continuum mechanics fatigue model : Fatigue limits for out-of-phase combinations of normal and shear stress}},
url = {{http://dx.doi.org/10.1016/j.prostr.2026.04.018}},
doi = {{10.1016/j.prostr.2026.04.018}},
volume = {{82}},
year = {{2026}},
}