Searched for: subject%3A%22Fracture%22
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Maljaars, J. (author), Rozsas, A. (author), Walters, C.L. (author), Slot, H.M. (author)
The failure assessment line (FAL) describes the interaction between plastic failure and fracture of flawed steel components subjected to tension or bending. This paper quantifies the model uncertainty of the FAL as provided in the internationally used British Standard BS 7910:2019 by comparing the assessment with the actual failure load of 82...
article 2022
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Jiang, Q. (author), Bertolo, V.M. (author), Popovich, V.A. (author), Sietsma, J. (author), Walters, C.L. (author)
Thick section S690 QT steel is modelled with a modified multibarrier model that is based on the weakest-link mechanism. Segregation bands are modelled as discrete layers which have different grain size, yield properties, and local fracture parameters from outside of the bands. The results show that embrittlement from segregation bands can only...
article 2022
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Leonetti, D. (author), Maljaars, J. (author), Snijder, B. (author)
Probabilistic fatigue life prediction models of welded steel joints are often used to estimate the level of safety, which is given in terms of the probability of failure or the reliability index as a function of the applied load cycles. Prediction models based on fracture mechanics allow taking into account the effect of inspections on the...
conference paper 2021
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Wassing, B.B.T. (author), Candela, T.G.G. (author), Osinga, S. (author), Peters, E. (author), Buijze, L. (author), Fokker, P.A. (author), van Wees, J.D.A.M. (author)
This paper describes and deploys a workflow to assess the evolution of seismicity associated to injection of cold fluids close to a fault. We employ a coupled numerical thermo-hydro-mechanical simulator to simulate the evolution of pressures, temperatures and stress on the fault. Adopting rate-and-state seismicity theory we assess induced...
article 2021
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Jiang, Q. (author), Bertolo, V.M. (author), Popovich, V.A. (author), Sietsma, J. (author), Walters, C.L. (author)
Macroscale cleavage fracture toughness of high strength steels is strongly related to the fracture of hard microstructural inclusions. Therefore, an accu rate determination of the local stress on these inclu sions based on the matrix stress is necessary for the statistical modelling of macroscale cleavage fracture. This paper presents analytical...
article 2021
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Bertolo, V.M. (author), Jiang, Q. (author), Walters, C.L. (author), Pupovich, V.A. (author)
One of the main challenges in applying thick-section high-strength steels (HSS) at arctic condition in offshore and maritime industry is to maintain a sufficient level of toughness to prevent brittle failure. An aspect that requires special attention is the through-thickness microstructural variation which may result in different local...
conference paper 2020
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Heidari, H. (author)
Considerable work has been done on the modelling of fracture and necking for accidents in the maritime and offshore industry, but very little has been done to find the crack orientation during this failure. Such information will be required in future analyses which use the eXtended Finite Element Method (XFEM), rather than the element deletion...
conference paper 2020
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Maljaars, J. (author), Tang, L. (author)
Crack closure effects during fatigue crack growth have been studied by many researchers with the finite element method, but appears difficult to accurately predict. Although quantification of crack closure may be a bridge too far, finite element models may help explaining observations from tests and give insight into trends. This paper studies...
article 2020
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Leonetti, D. (author), Maljaars, J. (author), Snijder, H.H. (author)
article 2020
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Coppejans, O.J. (author), Walters, C.L. (author)
Measurement of the fracture toughness of steel is important for the assurance of the safety of ships and offshore structures, especially when these structures are made of thick sections and/ or applied in cold environments. One key factor that will affect the determination of the fracture toughness is a pop-in, which is a short event in which...
conference paper 2019
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Park, S.J. (author), Lee, K. (author), Choung, J. (author), Walters, C.L. (author)
This study deals with ductile fracture prediction of a marine steel using new damage functions. The stress triaxiality and Lode angle are known to be governing parameters on the ductile fracture. Recent research has reported that loading path is also one of the important parameters. A three-dimensional fracture strain surface for EH36 steel was...
article 2018
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Maljaars, J. (author), Bonet, E. (author), Pijpers, P.J.M. (author)
Steel orthotropic decks in bridges and ferries have shown to be prone to fatigue cracking. A typical fatigue crack observed in these structures initiates at the root of the weld between the deck plate and stringer and grows into the deck plate. Due to limited fatigue test data available and the deviating characteristics of this type of crack as...
article 2018
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van Es, S. (author), Slot, H. (author), Steenbergen, H. (author), Maljaars, J. (author), Pijpers, R. (author)
In Memoriam of Prof. Dr. Bernt Johansson. The use of high-strength steels (HSS, 460 < fy ≤ 700 MPa) and particularly very high-strength steels (VHSS, fy > 700 MPa) is limited in steel structures in civil and offshore engineering. This is due to a lack of experience in structures made of these materials and a lack of understanding of the...
article 2018
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Fan, J.T. (author), Weerheijm, J. (author), Sluys, L.J. (author)
The deformation-to-fracture evolution of aflexible polymer material under high-strain-rate compressive loadingconducted by a split Hopkinson pressure bar (SHPB) setup was investigated. Representative tests were carriedout at different strain rate levels, followed by the characterization of dynamic damage after each test. Craze andcrack patterns...
article 2018
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Candela, T. (author), Wassing, B. (author), Heege, J.T. (author), Buijze, L. (author)
The sustainability of geothermal fields is based on a paradox. On one side, fractures are targeted on heat-flow improvement, and on the other side, the same fractures are avoided because of induced seismicity risk. In this context, we developed analytical approaches for estimating (1) thermo–poro-elastic stresses in a fractured geothermal system...
article 2018
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Leonetti, D. (author), Hashemi, B. (author), Allaix, D.L. (author), Maljaars, J. (author)
This paper investigates the differences in the predicted fatigue life of transverse butt weld joints and cover-plated beams considering statistically based fitting methods on fatigue test data and comparing the results with the S-N relation proposed in international standards. The test data fitting are performed by employing the Least Square...
conference paper 2017
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Voormeeren, L.O. (author), van der Meer, F.P. (author), Maljaars, J. (author), Sluys, L.J. (author)
The last decade has seen a growing interest in cohesive zone models for fatigue applications. These cohesive zone models often suffer from a lack of generality and applying them typically requires calibrating a large number of model-specific parameters. To improve on these issues a new method has been proposed in this paper based on the Thick...
article 2017
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Copppejans, O.J. (author), Walters, C.L. (author)
The local approach to modelling ductile tearing is a useful technique to give insight into fracture mechanics. However, applications of the local approach have been stymied by the high cost of finding the parameters that characterize it because of the number of specimens and expensive post-processing that the testing requires. In this paper, a...
conference paper 2017
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Hashemi, B. (author), Maljaars, J. (author), Leonetti, D. (author), Snijder, H.H. (author)
Reliability analysis is a crucial phase in assessing the safety status of new and existing structures. One of its applications is to predict the fatigue life of fatigue prone details. Two models are used to formulate the fatigue limit state: S-N curves in combination with Palmgren-Miner damage accumulation rule and linear elastic fracture...
article 2017
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Antropov, A. (author), Lavrov, A. (author), Orlic, B. (author)
Cap-rock integrity is of paramount importance during injection and subsequent long-term storage of CO2 in the subsurface. Preexisting (natural) and man-induced fractures in the cap rock represent potential flow paths out of the storage formation. In this study, a first-order semi-analytical model of flow through a vertical fracture penetrating...
conference paper 2017
Searched for: subject%3A%22Fracture%22
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