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A modal approach to identify fatigue damage in threaded connections of large scale tubular structures in a resonant bending test rig Universiteit Gent
The current work aims at using a modal approach to detect fatigue damage of threaded connections in large scale tubular structures. A full scale resonant bending fatigue test rig has been developed to test at first a plain pipe with notches. Two kinds of vibration testing are used for fatigue crack detection. Forced vibration tests (input-output) are performed before and after the fatigue test, in which input signals from forced excitation as ...
Dynamic 3D optical measurement system for the characterisation of the behaviour of a pipe in a resonant bending test rig Universiteit Gent
In this paper the dynamic behaviour of a pipe in a resonant bending fatigue test rig is investigated. This kind of test rig is used for full scale testing of pipeline joints such as girth welds and threaded connections. In order to optimize the test conditions in such a test rig, accurate knowledge of its dynamic behaviour is necessary. This dynamic behaviour is first evaluated theoretically using a semi-analytical model to study the effects of ...
Design of a four-point bend test for ultra-low cycle fatigue of pipelines under inelastic bending Universiteit Gent
This master thesis is situated in the research domain dealing with the ductile failure of pipelines under extreme loading conditions. It is part of an umbrella research aiming to develop innovative experimental and computational methodologies to simulate fracture of steel structural elements under ultralow cycle fatigue. The focus of this study is on steel pipeline applications. The objective of this thesis is to design a large-scale four-point ...
Comparison between new developed test method (using DMA) and the existing one for measurement of the bending force of monofilaments Universiteit Gent
The measurement of the bending force of monofilaments used in synthetic sport fields, which determines the quality and the performance in long terms, is still a main discussion on the world of artificial turf. This leads to the need of having précised results of the bending force measured and having the possibility of doing it on different conditions. A new test method has been developed by modifying the DMA equipment in order to use it for ...
Dynamic 3D optical measurement system for the characterisation of the behaviour of a pipe in a resonant bending test rig KU Leuven
In this paper the dynamic behaviour of a pipe in a resonant bending fatigue test rig is investigated. This kind of test rig is used for full scale testing of pipeline joints such as girth welds and threaded connections. In order to optimize the test conditions in such a test rig, accurate knowledge of its dynamic behaviour is necessary. This dynamic behaviour is first evaluated theoretically using a semi-analytical model to study the effects of ...
A modal approach to identify fatigue damage in threaded connections of large scale tubular structures in a resonant bending test rig KU Leuven
The current work aims at using a modal approach to detect fatigue damage of threaded connections in large scale tubular structures. A full scale resonant bending fatigue test rig has been developed to test at first a plain pipe with notches. Two kinds of vibration testing are used for fatigue crack detection. Forced vibration tests (input-output) are performed before and after the fatigue test, in which input signals from forced excitation as ...
Evaluation of Fatigue Behavior of Lead-Free Solder Joints in Four-Point Bending Test by Finite-Element Modeling KU Leuven
Fatigue performance of solder joints in four-point bending test is evaluated by finite-element modeling. A simplified modeling technique is implemented in order to focus on the behavior of the critical solder joint. The fatigue life is estimated by taking into account the creep behavior of the solder joints and the utilization of Morrow’s fatigue model. Fatigue life curves are generated for room temperature and two elevated temperatures with the ...
Effect of 4-point bending test procedure on crack propagation in thin film stacks KU Leuven
An in-depth study of 4-point bending (4PB) test method had been conducted in order to determine the influence of test parameters on measured critical energy release rate Gc and fracture location. Force loading speed proved to have an influence not only on measured Gc values, but also on quality of force–displacement curve plateau, as did the loading pin distance. While the 4PB technique is used to determine the adhesion strength of a material, a ...
Finite Element Modeling of Solder Joint Fatigue in Four-Point Bending Test KU Leuven
In this study, the fatigue performance of solder joints in four point bending test was evaluated by a novel finite-element modeling method. A simplified modeling technique was implemented in order to focus on the behavior of the critical solder joint. The fatigue life was estimated by taking into account the creep behavior of solder joints. Morrow's fatigue model was utilized to determine the fatigue life. The results were compared with the ...