Aleksandar-Saša Milaković

Aleksandar-Saša Milaković
Technische Universität Hamburg | TUHH · Institute of Ship Structural Design and Analysis

Master of Science

About

20
Publications
6,832
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200
Citations
Introduction
Skills and Expertise

Publications

Publications (20)
Article
Full-text available
Fatigue strength of welded joints is typically independent of the parent material static strength; however, there are two exceptions from this rule—post-weld treated joints and high-quality joints. The reason for both is the absence of sharp weld transitions. Thus, fatigue life is not fully governed by fatigue crack propagation but also by fatigue...
Article
The problem of typical stress-based fatigue assessment methods is that additional influencing factors like temperature effects do not directly influence the respective stress and can thus only be incorporated via modification factors. The stress averaging approach is expected to account for effects that influence the support around notches via the...
Conference Paper
Ships and offshore structures operating in Artic regions face specific challenges such as ice loads and seasonal low temperatures. In order to meet these extreme environmental requirements, the effect of temperature on material behaviour needs to be considered. It is well known that static material properties (yield strength, fracture toughness etc...
Preprint
Full-text available
Several studies have found significant increase in the fatigue strength of welded joints of structural steels at sub-zero temperatures. This study addresses the research by investigating the applicability of local fatigue assessment methods to welded joints exposed to sub-zero temperatures. For this purpose, fatigue test results of two fillet weld...
Article
Several studies have found significant increase in the fatigue strength of welded joints of structural steels at sub-zero temperatures. This study addresses the research by investigating the applicability of local fatigue assessment methods to welded joints exposed to sub-zero temperatures. For this purpose, fatigue test results of two fillet weld...
Article
Full-text available
Notches, local stress raisers within structural components, are one of the most important locations for fatigue crack initiation. It is well known that fatigue is governed by the effective stresses in the vicinity of notches. Within this study, differences in prediction accuracy between different types of theory of critical distance methods, that i...
Article
Full-text available
Computational methods for predicting ship speed profile in a complex ice field have traditionally relied on mechanistic simulations. However, such methods have difficulties capturing the entire complexity of ship–ice interaction process due to the incomplete understanding of the underlying physical phenomena. Therefore, data-driven approaches have...
Conference Paper
Due to increasing trend of building offshore wind turbines (OWTs) in seas at high latitudes where seasonal sea ice occurs, novel methods for design of such structures are needed. Specifically, the effect of ice-induced vibrations (IIVs) on fatigue life of the structures is currently poorly understood. Therefore, the goal of this paper is to analyze...
Article
Several definitions of equivalent ice thickness for simplification of complex ice cover are found in the literature. However, their systematic analysis is currently absent. Therefore, this paper reviews different definitions and validates them against a high-fidelity ice transit simulator, determining the most accurate one, with an average error of...
Conference Paper
Die Kiele moderner Hochleistungs-Segelyachten sind stark beanspruchte kritische Teile der Rumpfstruktur. Solche Kiele werden entweder aus dicken Stahlplatten gefräst oder sind geschweißte Hohlprofile aus hochfestem Stahl. Während die Schwingfestigkeit des Ausgangsmaterials linear mit der Streckgrenze des Materials zunimmt, ist sie nach dem Schweiße...
Article
When calculating equivalent-volume ice thickness along a vessel's projected route for the purpose of ice resistance estimation, information on both undeformed ice (level ice) and deformed ice (mainly ridges) is needed. Level ice information can be obtained from egg code-based ice charts in form of World Meteorological Organization (WMO) ice thickne...
Article
The Northern Sea Route (NSR) has received increased international attention during the recent years as an alternative transit corridor for shipping between Europe and East Asia. In 2015, the project "Feasibility and Reliability of Shipping on the Northern Sea Route and Modeling of an Arctic Marine Transportation & Logistics System" was established...
Article
Shipping in ice-covered regions has gained high attention within recent years. Analogous to weather routing, the occurrence of ice in a seaway affects the selection of the optimal route with respect to the travel time or fuel consumption. The shorter, direct path between two points—which may lead through an ice-covered area—may require a reduction...
Conference Paper
Shipping in ice covered regions has gained high attention within recent years. Analogous to weather routing, the occurrence of ice in a seaway affects the selection of the optimal route with respect to the travel time or fuel consumption. The shorter, direct path between two points — which may lead through an ice covered area — may require a reduct...
Conference Paper
As the global demand for energy is increasing, oil and gas exploration is moving further north to more remote areas. Offshore activity in these areas is challenging. Arctic-specific environmental conditions, long distances from onshore facilities and general lack of infrastructure are some of the challenges faced. Therefore, new and more robust sol...
Conference Paper
The Russian Federation attempts to foster the Northern Sea Route (NSR) as a transport alternative to the current Suez Canal Route (SCR). Therefore, this paper seeks to identify under which conditions the use of the NSR is economically feasible. To evaluate this in a realistic way it is essential to take the significant uncertainty of input variable...
Conference Paper
Due to a constantly increasing global energy demand on one side, and depletion of available hydrocarbon resources on another, a continuous search for new reserves of hydrocarbons is required (BP Energy Outlook 2035 [1]). Having in mind that estimated 22% of the world’s undiscovered petroleum is located in the Arctic, 84% of which is projected to be...
Article
Full-text available
Transport of oil from Russian Arctic ports to Western markets was insignificant prior to 2002. In 2002, there was a major surge, with 5 million tonnes delivered westwards through the Barents Sea. By 2004, this had increased to 12 million tonnes. Since then, annual volumes have been on levels between 9 and 15 million tonnes. In the near future, the...
Article
Climate changes and recent discoveries of hydrocarbon resources in the High North have strongly influenced research and development activities in arctic marine and offshore industries, resulting in new design approaches, methods and tools. These are, however, usually not readily available and rarely appear as a full ship design package, which lead...

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Projects

Project (1)
Project
This research project seeks to investigate the fatigue strength of welded steel of ship and offshore structures at sub-zero temperatures. For this purpose the material behavior of base materials and welded structures are analysed at temperatures down to -50°C by means of tensile, fracture toughness and S-N testing. Based on the results state-of-the-art fatigue assessment methods will be checked and if need updated. The research is focused on the following objectives: 1. To test the static and dynamic material properties for different structural details and material strengths at temperatures from room temperature to -50°C 2. Numerically simulation of the material behavior based on the test results 3. Verification of state-of-the-art fatigue assessment methods for welded structures at low temperatures like nominal stress, structural stress, notch stress and strain energy density methods