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- Johansson, Göran, 1975, et al.
(författare)
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Parameter identification and modeling of large ratcheting strains in carbon steel
- 2006
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Ingår i: Computers and Structures. ; 84, s. 1002-1011
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Tidskriftsartikel (refereegranskat)abstract
- In this paper the parameter identification procedure of a materialmodel for large multiaxial ratcheting strains, as proposed inJohansson et al., (2005), Int J Plasticity 21, 955-980, is demonstrated.In particular, experimental data for uniaxial and biaxialratcheting of carbon steel are considered. The biaxialexperimental data are from Jiang and Sehitoglu, (1994), Int J Plasticity10, 579-608. The material parameters are identified by means ofoptimization algorithms, and a sensitivity analysis is performed.
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| 3. |
- Ahlström, Johan, 1969, et al.
(författare)
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Fatigue behaviour of rail steel - a comparison between strain and stress controlled loading
- 2005
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Ingår i: Wear. - : Elsevier BV. - 0043-1648. ; 258:7-8, s. 1187-1193
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Tidskriftsartikel (refereegranskat)abstract
- Strain and stress-controlled fatigue testing of rail material UIC grade 900A has been performed. The tests were carried out in uniaxial, constant amplitude push-pull loading on polished test bars. Strain-controlled experiments were performed at 0.4, 0.6 and 1.0% total strain amplitude. Two identical tests at each strain level were made and the results show very little spread:
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| 6. |
- Ahlström, Johan, 1969, et al.
(författare)
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Modified Railway Wheel Steels: Production and Evaluation of Mechanical Properties with Emphasis on Low-Cycle Fatigue Behavior
- 2009
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Ingår i: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. - : Springer Science and Business Media LLC. - 1073-5623. ; 40A:7, s. 1557-1567
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Tidskriftsartikel (refereegranskat)abstract
- Railway wheels are exposed to high mechanical and thermal loads. The objective of this study has been to develop wheels that are more resistant to damage from these loads. Fourteen different materials have been produced in the form of full-scale railway wheels. Parameters that have been varied include the chemical composition, production processes, and heat treatment. The materials have been investigated microstructurally and by hardness, tensile, and impact toughness testing. In addition, the low-cycle fatigue (LCF) behavior has been characterized at room temperature and at subzero temperatures. The results indicate improvement in microstructure and mechanical properties for some materials and it is probable that these materials would endure better in service. © The Minerals, Metals & Materials Society and ASM International 2009.
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