Searched for: subject:"Cracks"
(1 - 20 of 68)

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Orlic, B. (author), Moghadam, A. (author), Brunner, L. (author), van Unen, M. (author), Wójcicki, A. (author), Bobek, K. (author), van der Valk, K. (author), Wollenweber, J. (author)
Well leakage risk is a key concern for the safety and economics of geological CO2 storage. Maintaining the integrity of annulus cement in the wellbore during the lifetime of well is of paramount importance. Cement properties and the stress state in cement at the downhole conditions are however uncertain and difficult, if at all possible, to...
conference paper 2021
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Dekker, R. (author), van der Meer, F.P. (author), Maljaars, J. (author), Sluys, L.J. (author)
This study presents calibration and validation of a cohesive extended finite element model for fatigue crack propagation in ductile materials. The approach relies on a separation between plasticity around the crack tip and fatigue crack growth at the crack tip such that the influence of plasticity on fatigue driving forces is predicted. This...
article 2021
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Slot, H.M. (author), Nicoreac, M. (author), Maljaars, J. (author)
Rolled steel plates and sections are often applied in structures in such a way that the principal load direction corresponds with the rolling direction. Examples are beams, arches, or pylons of bridges, supporting beams of ship decks, and the main elements of crane structures. However, some types of structure are subjected to a multiaxial stress...
article 2020
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Leonetti, D. (author), Maljaars, J. (author), Snijder, H.H. (author)
article 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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Simons, E.C. (author), Weerheijm, J. (author), Toussaint, G. (author), Sluys, L.J. (author)
In this study, the impact of a steel spherical projectile on an alumina ceramic is considered. New experimental and numerical results are presented and analysed. Numerical results are obtained using the Finite Element Method and the upgraded viscosity regularized Johnson-Holmquist-2 constitutive model to describe the ceramic material behaviour....
article 2020
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Dragt, R.C. (author), Hengeveld, S.T. (author), Maljaars, J. (author)
Load sequence effects in fatigue crack growth, such as retardation and acceleration due to a large overload (OL) and underload (UL), can dramatically change the (remaining) fatigue life. These effects can be determined using analytical and numerical tools, often trading accuracy for a steep increase in required calculation time. This paper...
article 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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Pijpers, R.J.M. (author), Verdenius, S.A. (author), Abspoel-Bukman, L.M. (author), Maljaars, J. (author)
This experimental study considers load sequence effects in fatigue crack growth in coupon specimens and in element specimens. The coupon specimens were standard edge crack configurations cyclically loaded under four point bending on base metal and welds, whereas the element specimens were full-scale axially loaded tubular joints. Whereas load...
article 2020
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Presvyri, S. (author), Yang, Y. (author), Hendriks, M. (author), Visser, J. (author), Hordijk, D. (author)
With the recent developments in modelling the shear behaviour of reinforcement concrete (RC) members without transverse reinforcement, the contribution of aggregate interlock has been more and more recognized as one of the critical components in the shear resistance of RC members. This paper presents a study on the aggregate interlock action...
conference paper 2019
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Dekker, R. (author), van der Meer, F.P. (author), Maljaars, J. (author), Sluys, L.J. (author)
Structures are subjected to cyclic loads that can vary in direction and magnitude, causing constant amplitude mode I simulations to be too simplistic. This study presents a new approach for fatigue crack propagation in ductile materials that can capture mixed-mode loading and overloading. The extended finite element method is used to deal with...
article 2019
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Oliveira, C.C.N. (author), Rochedo, P.R.R. (author), Bhardwaj, R. (author), Worrell, E. (author), Szklo, A. (author)
The urgency with which the world economy needs to be decarbonized could lead to the emergence of regions with the capacity to produce renewable feedstock such as biomass. The competitiveness of these regions could result from their ability to produce high value-added chemicals at the lowest cost. The biomass embodied in a chemical product could...
article 2019
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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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Dragt, R.C. (author), Hengeveld, S.T. (author), Maljaars, J. (author)
Measurements at Offshore Wind Turbine (OWT) substructures show that typical loading patterns include overloads, underloads, and shifts in mean stress cycles, due to the everchanging wind direction. These events follow each other in time and are further expressed as load sequences. Load sequences may affect the fatigue life. A novel model...
conference paper 2018
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Atli-Veltin, B. (author)
The main objective of the experimental study detailed in this paper is to investigate the performance of fully recyclable, lightweight, low-cost, thermoplastic Polypropylene (PP) composite tapes at low temperatures. Coupons made of [±45] and [0/90] laminates are subjected to tensile and 3-point bending tests at room temperature as well as at ...
article 2018
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Rikken, M. (author), Pijpers, R.J.M. (author), Slot, H.M. (author), Maljaars, J. (author)
This study examines residual stresses in bead-on-plate welded specimens in transverse direction over the thickness of the plate, using a combination of experimental and numerical procedures. Dilatometer and tensile tests were used to determine the phase transition temperatures with associated volumetric strains and the stressstrain relationships...
article 2018
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Hakouk, K. (author), Klotz, M. (author), Di Geronimo, E. (author), Ranieri, V. (author), Pieterse, J.A.Z. (author), Aranda Almansa, G. (author), Steele, A.M. (author), Thorpe, S. (author)
The conversion of hydrocarbons contained in product gas from medium-temperature biomass gasification into syngas is a crucial step to improve the overall process energy efficiency of biofuel production. Catalytic steam reforming is an attractive option; however, deactivation by tar and carbon deposition is one of the main challenges of steam...
article 2018
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Haffinger, P. (author), Jedari Eyvazi, F. (author), Steeghs, P. (author), Doulgeris, P. (author), Gisolf, D. (author), Verschuur, E. (author)
In the context of carbon capture and storage (CCS), quantitative estimation of injected CO2 is of vital importance to verify if the process occurs without any leakage. From a geophysical perspective this is challenging as a CO2 plume has a severe imprint on seismic data. While this makes delineation of the plume rather straightforward, for...
conference paper 2018
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Pahlavan, P.L. (author), Zhang, F. (author), Blacquière, G. (author), Yang, Y. (author), Hordijk, D. (author)
Interaction of ultrasonic waves with partially-closed surface-breaking cracks in concrete structures has been studied. Measurements have been conducted on a reinforced concrete beam containing various mechanical-load-induced cracks and compared with the baseline measurements at those locations. Influence of crack width, incident angle of waves...
article 2018
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Courage, W.M.G. (author), Nicoreac, M.P. (author), Kempker, P.L. (author)
For offshore wind turbines (OWT’s) environmental and accessibility conditions make inspection and maintenance costly. Hence the potential of cost reduction when the planning of these actions can be optimized. Taking uncertainties into account, a risk based concept is adopted in which probabilities of failure and its consequences are balanced...
conference paper 2017
Searched for: subject:"Cracks"
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