Elastic-plastic behaviour of welded joints during loading and unloading of pressure vessels

Sedmak, Simon; Algool, Mahdi; Sedmak, Aleksandar; Tatić, Uroš; Džindo, Emina

doi:10.1016/j.prostr.2016.06.442

Cited by 6 publications

(4 citation statements)

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“…55 By all means, Mladen was the father of computational mechanics in exYu, including CFM. [56][57][58][59] Anyhow, after all these efforts and developments, singular elements gradually lost their utmost importance, mainly because of an alternative way to calculate fracture mechanics parameters, eg, to use virtual crack extension for J-integral calculations, 60,61 providing useful results even with coarse meshes, as well as because they were unable to simulate crack growth. Another important alternative, using regular elements, is separated into 3 groups 52 :…”

Section: Numerical Simulation Of Linear Elastic and Elastic-plastic F...mentioning

confidence: 99%

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Computational fracture mechanics: An overview from early efforts to recent achievements

Sedmak

2018

Fatigue Fract Eng Mat Struct

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An overview of the state of the art of computational fracture mechanics is presented, starting from early efforts and going all the way up to recent achievements. Some specific aspects of linear elastic and elastic plastic fracture mechanics problems have been discussed, including the fact that even for a static loading, numerical simulation is not a simple task because of complex geometries, material nonlinearity, and heterogeneity, and especially if crack growth is considered. Therefore, micromechanical modelling of elastic‐plastic crack growth is presented as new and promising approach to overcome some of the shortages of traditional approach. Besides static loading, couple of other important practical problems are tackled, like fatigue crack growth, with remaining life in the focus of investigation, using the empirical laws for crack growth rates. Numerical simulation of fatigue crack growth is inherently complex both because of complex material damage processes and lack of sound theoretical basis to define them. Therefore, combination of theoretical, experimental, and numerical approach is presented here to get reliable and efficient estimation of life under fatigue loading.

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Section: Numerical Simulation Of Linear Elastic and Elastic-plastic F...mentioning

confidence: 99%

“…His doctoral thesis on thin plate isoparametric finite element booked him 1 of just 16 places in the First World Congress on Computational Fracture Mechanics . By all means, Mladen was the father of computational mechanics in exYu, including CFM …”

Section: Numerical Simulation Of Linear Elastic and Elastic‐plastic F...mentioning

confidence: 99%

Computational fracture mechanics: An overview from early efforts to recent achievements

Sedmak

2018

Fatigue Fract Eng Mat Struct

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“…3 and 4, maximal residual (plastic) strain is 0.24% (strain gauges 27) in welded joint LS4. Proportional behaviour during the second stage of testing can be observed, whereas unusual "loop" behaviour has been recorded in the third stage, as explained in [14].…”

Section: Prototype Testingmentioning

confidence: 88%

Structural Integrity Assessment of Welded Pipeline Designed with Reduced Safety

Jeremić¹,

Sedmak

Petrovski³

et al. 2020

Teh. vjesn.

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The main goal of this paper was to assess the integrity of welded joints in the main pipeline of the reversible hydropower plant "Bajina Bašta". Japanese steel Sumiten 80P (SM 80P) was used as the parent material. European recommendation for pipeline safety factor is equal to 1.7 and this value was used for calculations of the RHPP "Bajina Bašta", whereas the value recommended by Japanese standards is 2.1. A relatively small safety factor, which is different from the Japanese recommendation (since the material itself is Japanese), represented one of the main reasons for a detailed investigation of the pipeline structural integrity and safety, using the prototype. In the case of pressure vessels, the welded joint is a location of stress concentration, which can act in the same way as residual stresses. Assessment of prototype test results is possible to perform based on stress and strain calculations of vessels with ideal geometry. For this reason, the solution for thin-walled vessels is given, both in elastic and elastic-plastic areas. Numerous tests were performed in order to obtain a reliability assessment necessary for the construction of the pipeline, since the consequences of potential failure would be disastrous in this case. A numerical simulation, based on the experimentally determined mechanical properties of the material used, was also performed in order to obtain the stress/strain distribution. These results were then compared to the experimentally obtained ones, and it was concluded that there is a good level of compliance between numerical and experimental results.

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“…Later on, this approach was named the structural integrity [25]. Although this issue was a topic of a number of papers decades ago, only recently some of the most intriguing results have been explained in detail by using the finite element method for precise analysis of the stress-strain state, both for the prototype [26][27][28] and for tensile panels with large and small cracks, as shown in [29,30] for the BM. Here, the attention is focused on some new numerical results for the WM and observations on crack tip fields and constraint effects due to undermatching and crack size effects, obtained by comparison with the previous results for the BM.…”

Section: Introductionmentioning

confidence: 99%

Crack Size and Undermatching Effects on Fracture Behavior of a Welded Joint

et al. 2023

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Crack size and undermatching effects on fracture behavior of undermatched welded joints are presented and analyzed. Experimental and numerical analysis of the fracture behavior of high-strength low-alloyed (HSLA) steel welded joints with so-called small and large crack in undermatched weld metal and the base metal was performed, as a part of more extensive research previously conducted. J integral was determined by direct measurement using special instrumentation including strain gauges and a CMOD measuring device. Numerical analysis was performed by 3D finite element method (FEM) with different tensile properties in BM and WM. Results of J-CMOD curves evaluation for SUMITEN SM 80P HSLA steel and its weld metal (WM) are presented and analyzed for small and large cracks in tensile panels. This paper is focused on some new numerical results and observations on crack tip fields and constraint effects of undermatching and crack size keeping in mind previously performed experiments on the full-scale prototype. In this way, a unique combined approach of experimental investigation on the full-scale proto-type and tensile panels, as well as numerical investigation on mismatching and crack size effects, is achieved.

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Elastic-plastic behaviour of welded joints during loading and unloading of pressure vessels

Cited by 6 publications

References 1 publication

Computational fracture mechanics: An overview from early efforts to recent achievements

Computational fracture mechanics: An overview from early efforts to recent achievements

Structural Integrity Assessment of Welded Pipeline Designed with Reduced Safety

Crack Size and Undermatching Effects on Fracture Behavior of a Welded Joint

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