An Analysis of the Tvergaard Parameters at Low Initial Stress Triaxiality for S235JR Steel

Kossakowski, P.

doi:10.2478/pomr-2014-0046

Cited by 10 publications

(9 citation statements)

References 17 publications

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“…They are similar but slightly higher than the typical value, i.e. f F = 0.667, used for many metals, including the steel considered in this paper [3,17,18]. The obtained results are also higher than those reported in many studies concerning the GTN material model, i.e.…”

Section: Resultscontrasting

confidence: 50%

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Experimental determination of the void volume fraction for S235JR steel at failure in the range of high stress triaxialities

Kossakowski

2017

Archives of Metallurgy and Materials

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This paper is concerned with the critical void volume fraction fF representing the size of microdefects in a material at the time of failure. The parameter is one of the constants of the Gurson-Tvergaard-Needleman (GTN) material model that need to be determined while modelling material failure processes. In this paper, an original experimental method is proposed to determine the values of fF. The material studied was S235JR steel. After tensile tests, the void volume fraction was measured at the fracture surface using an advanced technique of quantitative image analysis The material was subjected to high initial stress triaxialities T0 ranging from 0.556 to 1.345. The failure processes in S235JR steel were analysed taking into account the influence of the state of stress.

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Section: Resultscontrasting

confidence: 50%

“…Its value differs depending on the material structure and the state of stress. Generally, f F is determined by combining experimental and numerical methods [11][12][13][14][15]; the other GTN parameters are defined in a similar way [3,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of the void volume fraction for S235JR steel at failure in the range of high stress triaxialities

Kossakowski

2017

Archives of Metallurgy and Materials

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“…Fatigue is accompanied by the cracking phenomenon, which generates high stress concentrations around the discontinuity in the material structure. Fracture is observed in many structural materials, including steels [2][3][4]. For steel structures, brittle fracture is extremely dangerous [5], thus it is essential to prevent it.…”

Section: Introductionmentioning

confidence: 99%

Failure of the overhead crane runway

2019

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The paper reports a failure of the overhead crane runway. Failures of this type often occur in industrial buildings that have been in operation for a long period of time. The reasons are dynamic, fatigue-related phenomena in crane operations, and also design and structural errors. An important issue is also the presence of geometric notches, which promote the formation of fatigue cracks, accelerating the process of degradation of the structure. Visual inspection of the overhead crane runways revealed loosening and failure of rail – beam connections, and also substantial horizontal and vertical displacements of the rails. Additionally, geodetic measurements of rail arrangement were taken. They indicated the exceeding of permissible deviations for rails spacing and vertical arrangement stated in the relevant standards. The runway damages resulted from dynamic character of the loads applied. In some cases, high crane travel speed and acceleration produced impact forces that affected the runway structure. Vertical and horizontal deformation of rails was an additional source of impact in the crane runs. Another contributing factor was inappropriate design of rails and beams fastening, and also insufficient number of rail dilatations. A repair program was proposed which involved the use of additional rail fastenings and dilatations.

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“…There are multiple studies concerning GTN parameters for many metals, but it is still necessary to analyse and determine them for structural steel used in construction, eg. [20][21][22][23][24], due to a lack of data for many basic grades.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Void Volume Fraction for S235JR Steel at Failure for Low Initial Stress Triaxiality

Kossakowski

2018

Archives of Civil Engineering

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This paper deals with problems of failure mechanisms of S235JR structural steel. One of the fundamental parameters of the Gurson-Tvergaard-Needleman damage mechanics-based material model is considered in order to describe the behaviour of the material at the plastic range. The analysis was performed on the void volume fraction fF determined at failure of S235JR steel. The case of low initial stress triaxiality η = 1/3 was taken into consideration. Different from the most popular methods such as curve-fitting, the experimental method based on the digital image analysis of the fracture surface of S235JR steel is proposed in order to determine the critical parameter fF.

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An Analysis of the Tvergaard Parameters at Low Initial Stress Triaxiality for S235JR Steel

Abstract: ABSTRACT

Cited by 10 publications

References 17 publications

Experimental determination of the void volume fraction for S235JR steel at failure in the range of high stress triaxialities

Experimental determination of the void volume fraction for S235JR steel at failure in the range of high stress triaxialities

Failure of the overhead crane runway

Analysis of the Void Volume Fraction for S235JR Steel at Failure for Low Initial Stress Triaxiality

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