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Item type:Publication, Access status: without files , Fatigue performance of aluminum alloy EN-AW 5083 cut edges produced by abrasive water jet and laser cutting(2023-04); ; ; ; Diniz e Castro, J.The application of aluminum alloys within the maritime industry is very common for hull structures of smaller vessels and lightweight constructions such as deck housings and other superstructure elements. Besides welded details, the geometry of cut-outs and openings within the structure leads to stress concentrations that could be considered critical for the fatigue behavior. These openings are in general cut by thermal processes or waterjets. In the recommendations and class regulations for fatigue design of cut edges made of aluminum alloys, the amount of available guidelines for these details is very limited. The recommendations by IIW include only one design category of cut edges for the nominal stress approach. In addition, no differentiation is made regarding cutting techniques and qualities, as it is done for steel, as well as not for edge treatments such as grinding. This paper describes the fatigue testing of different specimen series cut out by laser and abrasive water jet (AWJ). All specimen bodies are made out of aluminum alloy EN-AW5083 plate material with a thickness of 4 or 5 mm.Publicationtype: Conference Paper31 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Impact tests in pure and aerated waterImpact loads due to slamming or ditching are an important issue in marine and aircraft engineering. Accordingly, many experimental, theoretical and numerical investigations have been performed. The paper reports the build-up of a test rig, which was designed to study vertical guided motion impact tests, and the results of an experimental study on impact loads into pure and aerated water. Attention is given to the loads experienced by a rigid circular-cylinder section (diameter=0.2 m, length=0.5 m) during guided, constant-speed impact. The investigations involve a variety of entry speeds up to 3m/s and gas-content levels. The obtained data offers a basis for an analysis of the sensitivity of the impact loads on the gas content. Fair compliance with literature reported experimental and theoretical results - using e.g. von Kármán or Wagner theories - has been obtained for pure water impact loads. For impact tests in aerated water, a significant reduction of the measured pressure peaks becomes apparent. Finally, the paper illustrates the feed back of the experimental results into an impact-load model, taking the fluid compressibility into account.Publicationtype: Conference Paper173 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Zweiter Interdisziplinärer Workshop Maritime Systeme : aktuelle Ergebnisse aus laufenden Promotionsprojekten an der TUHH(Forschungsschwerpunkt Maritime Systeme der TUHH, 2010); ; ; ; Proceedings of the Second Interdisciplinary Workshop Maritime SystemsPublicationtype: Conference Proceedings1168 611