Publications & Posters

2010 - 2011

• Daneshpour, S.; Dyck, J.; Ventzke, V.; Huber, N.: Crack retardation mechanism due to overload in base material and laser welds of Al alloys. International Journal of Fatigue xxx (2011) pp. xxx–xxx.
• Schnubel, D.; Huber, N.: The influence of crack face contact on the prediction of fatigue crack propagation in residual stress fields . Engineering Fracture Mechanics Vol. xxx, pp. xxx-xxx. doi: 10.1016/j.engfracmech.2011.12.008
• Vaidya, W. V.; Staron, P.; Horstmann, M.: Fatigue crack propagation into the residual stress field along and perpendicular to laser beam butt-weld in aluminium alloy AA6056. Fatigue & Fracture of Engineering Materials & Structures. Vol. xxx pp. xxx-xxx. doi: 10.1111/j.1460-2695.2011.01631.x.
• Staron, P.; Fischer, T.; Lippmann, T.; Stark, A.; Daneshpour, S.; Schnubel, D.; Uhlmann, E.; Gerstenberger, R.; Camin, B.; Reimers, W.; Eidenberger, E.; Clemens, H.; Huber, N.; Schreyer, A.: In Situ Experiments with Synchrotron High-Energy X-Rays and Neutrons. Advanced Engineering Matarials, 2011, Volume 13, Issue 8, pp. 658-663. doi: 10.1002/adem.201000297.
• Daneshpour, S.; Dyck, J.; Ventzke, V.; Huber, N.: Crack retardation mechanism due to overload in base material and laser welds of Al alloys. International Journal of Fatigue, (2011). doi:10.1016/j.ijfatigue.2011.07.010.
• Uz, M. V.; Chen, Y. J.; Huber, N.: Fatigue life improvement of metallic aerosapace structures via crenallations. 26^th ICAF Symposium, Montréal, 1–3 June 2011
• Schnubel, D.; Möller, M.; Huber, N.: Boundary condition identification for structural welding simulation via artificial neural networks . In Proccedings of the 3rd International Workshop on Thermal Forming and Welding Distortion IWOTE. Bremen 6-7April 2011.
• Daneshpour, S.; Koçak, M.; Riekehr, S.; Staron, P.; Martinson, P.: Residual stress and fatigue analyses of laser spot welded joints. Mathematical Modelling of Weld Phenomena 9, ISBN 978-3-85125-127-2, Technische Universität Graz- Austria, 2010, pp. 727-743.
• Daneshpour, S.; Dyck, J.; Ventzke, V.; Huber, N. : Mechanisms of crack retardation due to overload in Al-alloy laser welds. Fatigue Damage of Structural Materials (FDSM VIII), 19-24 Sept. 2010, Hyannis, USA.
• Vaidya, W. V.; Horstmann, M.; Ventzke, V.; Petrovski, B.; Koçak, M.; Tempus, G.: Improving interfacial properties of a laser beam welded dissimilar joint of aluminium AA6056 and titanium Ti6Al4V for aeronautical applications. Journal of Materials Science (2010) 45, Number 22, pp. 6242-6254. doi 10.1007/s10853-010-4719.
• Schnubel, D.; Staron, P.; Koçak, M.; Huber, N.: Mechanical Tensioning - An Approach to Control Residual Stresses and Distortions of Laser Welded Aluminium Skin-Stringer Joints. In European Conference on Materials and Structures in Aerospace EUCOMAS 2010, 7-8 June 2010.
• Ventzke, V.; Brokmeier, H.-G.; Merhof, P.; Koçak, M.: Microstructural characterization of friction welded TiAl-Ti6Al4V hybrid joints. Solid State Phenomena, Vol. 160 (2010), pp. 319-326, Trans. Tech, Publications, Switzerland, doi:10.4028/www.scientific.net/SSP.160.319.
• Vaidya, W. V.; Horstmann, M.; Angamuthu, K.; Koçak, M.: Parametric (Non)-Variance of the Mid-Regime Fatigue Crack Propagation in an Aluminium Alloy AA6056-T6. MP Materials Testing - Materials and Components Technology and Application, Volume: 52, Issue 5, pp. 300-305.
• Vaidya, W. V.; Horstmann, M.; Angamuthu, K.; Koçak, M.: Utilising COD(max) as an Indirect Fatigue Crack Length Measurement Parameter for M(T) Specimens of an Airframe Aluminium Alloy AA6056. MP Materials Testing - Materials and Components Technology and Application, Vol. 52 (2010), Issue 11-12, pp. 771-777.

 2005 - 2009

• Daneshpour, S.; Kocak, M.; Langlade, S.; Horstmann, M.: Effect of overload on fatigue crack retardation of aerospace Al-alloy laser welds using crack-tip plasticity analysis. In: International Journal of Fatigue. Vol. 31 (2009) 10, 1603 - 1612.   DOI:10.1016/j.ijfatigue.2009.04.005
• Daneshpour, S.; Riekehr, S.; Kocak, M.; Gerritsen, C.H.J.: Mechanical and fatigue behaviour of laser and resistance spot welds in advanced high strength steels. In: Science and Technology of Welding and Joining. Vol. 14 (2009) 1, 20 - 25.
• Martinson, P.; Daneshpour, S.; Kocak, M.; Riekehr, S.; Staron, P.: Residual stress analysis of laser spot welding of steel sheets. In: Materials and Design. Vol. 30 (2009) 9, 3351 - 3359. DOI:10.1016/j.matdes.2009.03.041
• Uz, M.-V.; Kocak, M.; Lemaitre, F.; Ehrstroem, J.-E.; Kempa, S.; Bron, F.: Improvement of damage tolerance of laser beam welded stiffened panels for airframes via local engineering. In: International Journal of Fatigue. Vol. 31 (2009) 5, 916 - 926.  
• Vaidya, M.V.; Horstmann, M.; Ventzke, V.; Petrovski, B.; Kocak, M.; Kocik, R.; Tempus, G.: Structure-property investigations on a laser beam welded dissimilar joint of aluminium AA6056 and titanium Ti6Al4V for aeronautical applications, Part I: Local gradients in microstructure, hardness and strength. In: Materialwissenschaft und Werkstofftechnik. Vol. 40 (2009) 8, 623 - 633.
• Vaidya, M.V.; Horstmann, M.; Ventzke, V.; Petrovski, B.; Kocak, M.; Kocik, R.; Tempus, G.: Structure-property investigations on a laser beam welded dissimilar joint of aluminium AA6056 and titanium Ti6Al4V for aeronautical applications, Part II: Resistance to fatigue crack propagation and fracture. In: Materialwissenschaft und Werkstofftechnik. Vol. 40 (2009) 10, 769 - 779.
• Coelho, R.S.; Kostka, A.; Pinto, H.; Riekehr, S.; Kocak, M.; Pyzalla, A.R.: Microstructure and mechanical properties of magnesium alloy AZ31B laser beam welds. In: Materials Science and Engineering A. Vol. 485 (2008) 1-2, 20 - 30.
• Alexandrov, S.; Kocak, M.: Limit load analysis of strength undermatched welded T-joints under bending. In: Fatigue and Fracture of Engineering Materials and Structures. Vol. 30 Oxford: Blackwell, (2007) 4, 351 - 355.
• Daneshpour, S.; Riekehr, S.; Kocak, M.; Ventzke, V.; Koruk, A.I.: Failure behaviour of laser spot welds of TRIP800 steel sheets under coach–peel loading. In: Science and Technology of Welding and Joining. Vol. 12 London: Maney, (2007) 6, 508 - 515.
• E. Seib, M. Koçak, V. Zu: Fracture Analysis of Thin-Walled Laser Beam and Friction Stir Welded Al-alloys using FITNET FFS Procedure, Int. Conf. FITNET 2006, 17-19 May 2006, Amsterdam.
• W.V Vaidya, M. Horstmann, E. Seib, K. Toksoy, M. Kocak: Assessment of Fracture and Fatigue Crack Propagation of Laser Beam and Friction Stir Welded Aluminium and Magnesium Alloys. In: Advanced Engineering Materials 2006, 8, No. 5, pp. 399-406.
• FS Bayraktar, P. Staron, M. Koçak, A. Schreyer: Residual Stress Analysis of Laser Welded Aluminium T-Joints Using Neutron Diffraction. In: Materials Science Forum Vols, 524-525 (2006) pp. 419-424.
• E. Seib, M. Koçak: Fracture Analysis of Strength Undermatched Welds of Thin-walled Aluminium Structures using FITNET Procedure. In: Welding in the World, November/December 2005, pp. 58-69.

• Improvement of Damage Tolerance of Laser Beam Welded Aerospace Structures via Local Engineering
• Reibschweißen der γ -TiAl-Feingusslegierung Ti-47Al-3.5(Mn+Cr+Nb)-0.8(B+Si)