Fatigue Crack Characteristics in Gradient Predeformed Pearlitic Steel under Multiaxial Loading
Artikel i vetenskaplig tidskrift, 2024

Rolling contact fatigue of railway rails not only severely deforms the surface material near the rail head, but also induces an anisotropy in the mechanical behavior due to work hardening and alignment of the microstructure along the shear direction. Cracks typically initiate in this region and propagate along the aligned microstructure. The fatigue behavior of rails is evaluated under uniaxial loading in the undeformed material state. However, this is not representative of the contact loading condition and material performance after years of service. Herein, the nonproportional multiaxial fatigue of as-received and biaxially predeformed pearlitic rail steel R260 is investigated. Four material states are investigated, corresponding to the microstructure found at different depths from the severely deformed surface material at the rail head. A starting notch is machined by electrical discharge machining to control crack initiation and allow for comparable surface crack propagation measurements. The crack path is found to be strongly influenced by the degree of predeformation while the early surface crack propagation rate is found to be similar for all material states.

fatigue crack propagation

pearlitic steel

multiaxial fatigue

axial–torsion

large plastic deformation

Författare

Daniel Gren

Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial

Johan Ahlström

Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial

Magnus Ekh

Chalmers, Industri- och materialvetenskap, Material- och beräkningsmekanik

Advanced Engineering Materials

1438-1656 (ISSN) 1527-2648 (eISSN)

Vol. 26 19 2400950

Driving research and innovation to push Europe's rail system forward (IN2TRACK3)

Europeiska kommissionen (EU) (EC/H2020/101012456), 2021-01-01 -- 2023-12-31.

Trafikverket (2021/19114), 2021-01-01 -- 2023-12-31.

Styrkeområden

Transport

Materialvetenskap

Ämneskategorier

Teknisk mekanik

Beräkningsmatematik

Annan materialteknik

Metallurgi och metalliska material

Fundament

Grundläggande vetenskaper

DOI

10.1002/adem.202400950

Mer information

Senast uppdaterat

2024-12-10