Abstract
Structural integrity of aircraft, nuclear power plants, space rockets, ships, automotive structures, biomedical devices, and many other applications, is a major design purpose and concerns various components subjected to cyclic loads for which fatigue is generally the dominant factor leading to its failure. The fatigue damage cumulation phenomenon is a process which may lead to cracks initiation and possibly to the structure failure under the action of variables stresses cycles. The mechanical components are generally subjected to multiaxial stress states. Taking into account this stress states triaxiality generally deals with multiaxial fatigue criteria. They are suitable tools for assessing the material fatigue resistance against periodical stress states, especially when they are multiaxial. The study carried out in this paper aims to analyze the fatigue behaviour of pre-stressed bolts involved in a so-called tee-stub bolted assembly that is subjected to variable loads. A multiaxial fatigue post-processing tool using two multiaxial fatigue approaches (integral approach and critical plan approach) is developed and implemented on Matlab software in order to assess the bolt fatigue damage and then its fatigue life through an iterative process. The tool is validated by fatigue test results on bolted assemblies found in the literature, which are additionally compared with those obtained by standards (Eurocode, VDI). A parametric study on the tee-stub is then performed.
Highlights
Metal structures essentially consists of a set of elements such as columns and beams
We performed a parametric study to analyze the respective influences upon the bolt fatigue behaviour of the preload, of the bolt location and of the tee-stub thickness
From the comparison of experimental and numerical lifetimes, it can be stated that the iterative multiaxial fatigue life calculation procedure that we have implemented allows a fairly good prediction of fatigue life when the stress states are fairly calculated and the fatigue properties of the material well identified
Summary
Metal structures essentially consists of a set of elements such as columns and beams. To ensure the correct transmission of forces between these elements, links are made between components according to different methods as bolting. In order to clearly understand the fatigue behaviour of bolted connections, a tee-stub where bolts are submitted to a pretension force is numerically studied by the use of Finite Element Model on Salome-Meca software. A fatigue post-treatment tool is implemented on Matlab software and uses two multiaxial fatigue approaches. It allows to assess the fatigue damage and the fatigue life of material or structures under multiaxial constant amplitude cyclic stress states. We performed a parametric study to analyze the respective influences upon the bolt fatigue behaviour of the preload, of the bolt location and of the tee-stub thickness
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