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Cornelissen, R. (author), Maljaars, J. (author), Hofmeyer, H. (author)Curved aluminium extrusions are applied in a wide range of industrial applications. Because extrusions are initially straight, an additional process is required to curve the product. Undesired wrinkling of the plate part at the inner radius is frequently observed during the curving process. Wrinkling has already been extensively studied for the...article 2021
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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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Leonetti, D. (author), Maljaars, J. (author), Pasquarelli, G. (author), Brando, G. (author)Hot-riveted connections have been widely used in the past for metallic bridges, of which a large part is still in service, making relevant the assessment of their fatigue life. Previous studies have shown that the fatigue behavior of hot-riveted connections depends on many factors; among these, the residual tensile force in the rivets that...article 2020
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Leonetti, D. (author), Maljaars, J. (author), Snijder, H.H. (author)This paper presents a probabilistic fatigue life prediction model for welded details subjected to variable amplitude random loading, using the nominal stress approach. The proposed model makes use of CA S-N curves in combination with the relative damage rule which allows to globally account for load interaction effects, and the damage limit...article 2020
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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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den Otter, C. (author), Maljaars, J. (author)Bolted connections are applied in many aluminium structures. Stainless steel bolts are often preferred over carbon steel bolts in aluminium connections to prevent galvanic corrosion. However, current design standards and guidelines do not allow for using preloaded stainless steel bolts in slip resistant connections, mainly because of a lack of...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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Maljaars, J. (author)Fatigue verification of bridge structures requires information on the loads induced by heavy vehicles, which can be obtained from weigh in motion measurement (WIM) systems. The current fatigue load models applied in Europe are based on traffic load measurements in 1986. This paper evaluates the appropriateness of these models for today’s traffic...article 2020
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- Leonetti, D. (author), Maljaars, J. (author), Snijder, H.H. (author) article 2020
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Leonetti, D. (author), Snijder, H.H. (author), Maljaars, J. (author)This present paper concerns the application of probabilistic fatigue life prediction models based on S–N curves aiming at the estimation of the safety level for a nonload carrying cruciform joint. The safety level is expressed in terms of the reliability index as a function of the number of applied cycles. Estimating the reliability of a...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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Xu, Q. (author), Hofmeyer, H. (author), Maljaars, J. (author)A multi-scale approach is proposed to simulate the fire resistance of panels used in façades of buildings: Using existing models, fire is modelled by CFD, its effects in the façade found via a thermodynamical model. Then a thermomechanical model predicts the mechanical behaviour, using linear elastic springs for the connections holding the...conference paper 2019
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de Boer, J.G.G.M. (author), Hofmeyer, H. (author), Maljaars, J. (author), van Herpen, R.A.P. (author)A self-supporting sandwich panel facade system under fire is studied. First, a thermomechanical FE model, which comprises the complete facade system, and incorporates material degradation and geometrical nonlinear behaviour except for the insulation material and connections, is loaded by a fire temperature curve. Eurocode design rules then...article 2019
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Annan, R. (author), Bechtold, M. (author), Friedrich, H. (author), Maljaars, J. (author), Misiek, Th. (author), Paschen, M. (author)During the ongoing revision of EN 1993-1-11 “Design of structures with tension components” theconference paper 2019
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Manders, W. (author), Maljaars, J. (author), Belin, B. (author), Lukic, M. (author)The strength and stability of aluminium structures are expected to be determined with formulas from the design standards for aluminium structures. In Europe, the latter are represented by Eurocode 9. In case structural components are made of hollow sections, widely used in the aluminium built environment, Eurocode 9 does not provide design rules...article 2019
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Hashemi, B. (author), Maljaars, J. (author), Snijder, H.H. (author)In order to design structural details of bridges for fatigue, the current version of the Eurocode for steel structures recommends partial factors for fatigue resistance based on the consequences of failure and on the maintenance method. The safe-life method is used for details where local formation of cracks could rapidly lead to failure or for...conference paper 2019
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Nagy, W. (author), de Backer, H. (author), Thierens, G. (author), Blontrock, H. (author), van Bogaert, P. (author), Reynaert, K. (author), Maljaars, J. (author)Orthotropic Steel Decks (OSDs) are widely used in long span bridges because of their extremely light weight when compared to their load carrying capacity. These deck types typically consist of a grillage of closed trapezoidal longitudinal stiffeners and transverse web stiffeners, welded to a deck plate. As a result, fatigue problems occur due to...conference paper 2019
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Leonetti, D. (author), Snijder, H.H. (author), Maljaars, J. (author)Two basic procedures are currently available to determine the critical condition of a flawed structure, at which unstable crack extension may occur. The first method based on elastic-plastic fracture mechanics is accurate but requires a time consuming elastic-plastic finite element analysis. The second method estimates the critical condition...conference paper 2019
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Leonetti, D. (author), Maljaars, J. (author), Snijder, H.H. (author)Before bolts were invented, hot-riveting was employed as technological process to produce built-up structural members of steel structures. Nowadays, these structures being still in service and susceptible to fatigue failure,they need to be assessed for their remaining service life. To estimate the fatigue life distribution of riveted connections...article 2019