Searched for: subject%3A%22Welds%22
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Deul, M.L. (author), van Lieshout, P. (author), Werter, N.P.M. (author)
An accurate fatigue life prediction is vital for the effectiveness and safety of a ship structure. The fatigue limit state is typically governing and con servatism is included to provide for a safe design. On the other side, minimizing conservatism is favourable, for reasons of cost, stability and payload (i.e. weight). The fatigue life...
conference paper 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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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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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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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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Weimer, P. (author), Bouroullec, R. (author), van den Berg, A.A. (author), Lapinski, T.G. (author), Roesink, J.G. (author), Adson, J. (author)
The Mensa and Thunder Horse intraslope minibasins in southcentralMississippi Canyon, northern deep-water Gulf ofMexico, had a linked structural evolution from the Early Cretaceous through the late Miocene. Analysis of the two minibasins illustrates the complexities of deep-water sedimentation and salt tectonics in intraslope minibasins. This...
article 2017
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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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den Bakker, A.J. (author), Werkhoven, R.J. (author), Sillekens, W.H. (author), Katgerman, L. (author)
Longitudinal weld seams are an intrinsic feature in hollow extrusions produced with porthole dies. As these joins occur along the entire extruded length, it is desirable that these weld seams have a minimal impact on the structural integrity of the extrudate. In particular, defects associated with weld seam formation should be avoided. In this...
article 2014
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van Es, S.H.J. (author), Kolstein, M.H. (author), Pijpers, R.J.M. (author), Bijlaard, F.S.K. (author)
Weld improvement techniques are aimed at reducing the notch effects of welds and generally focus on two aspects: a change of geometry of the weld toe and a change of the weld residual stresses. In this paper, fatigue tests are discussed, performed on butt welded specimens in steel grades ranging from S460 to S1100 in the TIG-dressed condition....
article 2013
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Maljaars, J. (author), Lukić, M. (author), Soetens, F. (author)
The fatigue behaviour of aluminium shows not only many similarities, but also some differences with the fatigue behaviour of steel. There exist separate Eurocodes for the fatigue design of steel and of aluminium structures, EN1993-1-9 and EN1999-1-3, respectively. The latter standard was developed after the draft version of the first one was...
article 2013
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Maljaars, J. (author), Pijpers, R.J.M. (author)
A number of orthotropic deck structures of existing bridges are suffering from fatigue cracks. Maintenance of these deck structures may consist of regular inspections and repair of detected cracks. The usual fatigue design life procedure for aswelded structures based on S-N curves is not feasible for determining the remaining fatigue life after...
conference paper 2013
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van Es, S.H.J. (author), Kolstein, M.H. (author), Pijpers, R.J.M. (author), Bijlaard, F.S.K. (author)
This paper presents the results of extensive measurements on weld toe geometry of as-welded and TIG-dressed butt welded connections in high strength steels S460, S690 and very high strength steels S890 and S1100. Descriptions of the measurement techniques and data analysis are presented. Four weld toe parameters have been formulated to...
article 2013
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Pijpers, R. (author), Kolstein, H. (author), Bijlaard, F. (author)
An effective application of Very High Strength Steels (VHSS) can be expected in truss-like structures, typically made of hollow sections. Improved design of VHSS truss structures could incorporate the application of cast joints, since an appropriate design of cast joints limits the stress concentrations in the joint and welds are shifted out of...
conference paper 2013
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Zhang, J. (author), Drinkwater, B.W. (author), Wilcox, P.D. (author), Hunter, A.J. (author)
The quality of an ultrasonic array image, especially for anisotropic material, depends on accurate information about acoustic properties. Inaccuracy of acoustic properties causes image degradation, e.g., blurring, errors in locating of reflectors and introduction of artifacts. In this paper, for an anisotropic austenitic steel weld, an autofocus...
conference paper 2012
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Sibillano, T. (author), Ancona, A. (author), Rizzi, D. (author), Mezzapesa, F. (author), Konuk, A.R. (author), Aarts, R.G.K.M. (author), Huis in 't Veld, A.J. (author), Lugara, P.M. (author)
In-process monitoring and feedback control are fundamental actions for stable and good quality laser welding process. In particular, penetration depth is one of the most critical features to be monitored. In this research, overlap welding of stainless steel is investigated to stably reproduce a fixed penetration depth using both CO2 and Nd:YAG...
conference paper 2012
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Konuk, A.R. (author), Aarts, R.G.K.M. (author), Huis in 't Veld, A.J. (author), Sibillano, T. (author), Rizzi, D. (author), Ancona, A. (author)
Recent developments in laser joining show the applicability of spectral analysis of the plasma plume emission to monitor and control the quality of weld. The analysis of the complete spectra makes it possible to measure specific emission lines which reveal information about the welding process. The subsequent estimation of the electron...
conference paper 2011
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Hegeman, J.B.J. (author), Luzginova, N.V. (author), Jong, M. (author), Groeneveld, H.D. (author), Borsboom, A. (author), Stuivinga, M.E.C. (author), van der Laan, J.G. (author)
The mechanical properties of two explosively formed saddle shaped 60 mm thick plates of 316L(N)-IG steel with and without an electron beam weld have been investigated. Two different conditions have been characterized: (1) Reference condition and (2) ITER relevant condition. The reference material exhibits consistent results for both plates,...
article 2011
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Pijpers, R.J.M. (author)
doctoral thesis 2011
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den Bakker, A.J. (author), Werkhoven, R.J. (author), Sillekens, W.H. (author), Katgerman, L. (author), TNO Industrie en Techniek (author)
Longitudinal weld seams are an intrinsic feature in hollow extrusions produced with porthole dies. The formation of longitudinal weld seams is a solid bonding process, controlled by the local conditions in the extrusion die. Being the weakest areas within the extrusion cross section, it is desirable to achieve adequate properties of these weld...
conference paper 2010
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