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1.
An approach to consider the arterial residual stresses in modelling of a patient-specific artery
Janez Urevc, Miroslav Halilovič, Milan Brumen, Boris Štok, 2016, original scientific article

Abstract: In this work, the residual stress state of a human common carotid artery is predicted using the so-called thermomecha- nical analogy approach. The purpose of the approach is to enable consistent mapping of residual stresses and the respec- tive configuration from a circular arterial segment to a patient-specific arterial geometry. This is achieved by applying proper volumetric dilatations to the actual arterial stress-free in vivo geometry, which makes use of the analogy that states that the bending stresses can be obtained on an equivalent manner by applying proper thermal dilatations. The common carotid artery data are obtained in vivo from a healthy 28-year-old man using non-invasive methods. The pre- dicted residual stresses of the common carotid artery are in good quantitative agreement with the data from prior work in this field. The approach is validated by predicting the common carotid artery zero-stress state configuration, where a sector-like (cut-open) state is obtained. With this approach, it is thus possible to predict the residual stresses as well as the configuration of patient-specific arterial geometry without the need to model its cut-open zero-stress configuration.
Keywords: patient-specific artery, common carotid artery, residual stresses, arterial zero-stress state, thermomechanics, finite element method
Published in DKUM: 12.07.2017; Views: 951; Downloads: 332
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2.
Suitability of heat treatment for crack resistance of material in the connection part of heavy transporter for liquid slag
Tomaž Vuherer, Ljubica Milović, Milorad Zrilić, Ivan Samardžić, Vladimir Gliha, 2013, short scientific article

Abstract: The post weld heat treatment (PWHT) was used to reduce the level of the residual stresses and increase of the crack resistance of the materal in the cnnection part. The article presents the results of the residual stress measurements immediately after welding and after the stress relaxation by the PWHT.
Keywords: weld, heat treatment, residual stress, stress relaxation, crack resistance
Published in DKUM: 03.07.2017; Views: 1880; Downloads: 87
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3.
Influence of vibrations on residual stresses distribution in welded joints
Ivan Samardžić, Tomaž Vuherer, Dejan Marić, Pejo Konjatić, 2015, original scientific article

Abstract: This paper presents research experience related to implementation of vibrations on residual stress relief with the equipment for treatment by vibration method. The paper provides explanation of effects achieved by vibration method when implemented during welding, and elaborates advantages and disadvantages of that method applied after welding process. In order to present effects of vibration on solid structures, there was experimental analysis performed and compared with heat treatment.
Keywords: welding, vibrations, residual stress, heat treatment
Published in DKUM: 03.07.2017; Views: 783; Downloads: 104
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4.
Fatigue crack initiation from microstructurally small Vickers indentations
Tomaž Vuherer, Andrej Godina, Zijah Burzić, Vladimir Gliha, 2007, original scientific article

Abstract: The resistivity of coarse grain steel against crack initiation in the presence of micro defects is discussed. Samples of material with martensitic microstructure were prepared by adequate thermal treatment. Microstructurally small Vickers indentations were used as an artificial micro defect. The compressive residual stresses are due to the irreversibility of plastic deformation. The moment of indenting enables to prepare samples with and without effects of residual stresses. The stress level for crack initiation depends on the actual indentation size. The location of initiated cracks is affected by the presence and character of residual stresses.
Keywords: welded joints, micro defect, coarse grain HAZ, crack initiation, crack growth, stress concentration, fatigue limit, Vickers, residual stresses
Published in DKUM: 03.07.2017; Views: 1010; Downloads: 101
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5.
Proposal of new Pipe-Ring specimen for fracture mechanics
Darko Damjanović, Dražan Kozak, Nenad Gubeljak, Vlado Tropša, 2016, published scientific conference contribution

Keywords: residual stress, pipe, hoop stress, incremental hole drilling method, splitting method, tensile test, F - CMOD, PRS, PRNB, SENB
Published in DKUM: 12.08.2016; Views: 983; Downloads: 221
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6.
Effect of vibration on weld metal hardness and toughness
Bogdan Pučko, Vladimir Gliha, 2005, original scientific article

Abstract: Vibration of welded parts is usually applied to achieve effects similar to thermal stress relief. With vibration, it is not only residual stresses that are affected. Using two different welding processes, the influence of vibration on hardness and toughness of the weld was measured. For each weldingprocess, two series of Charpy specimens were made over the temperature range from -60 to +20°C. The only difference between the two series was in performing welding with or without vibration. Slight differences in weld metalhardness were observed. Toughness measurements show an increase in impacttoughness and a significant increase in fracture toughness in samples which were vibrated during welding.
Keywords: welding, welded joints, residual stresses, vibrational stress relief, hardness, toughness, steel
Published in DKUM: 01.06.2012; Views: 2002; Downloads: 87
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