1. Determining the life cycle of bolts using a local approach and the Dang Van criterion
- Author
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Jean Guillot, Michel Chaussumier, Alain Daidié, Youssef Fares, Laboratoire de Génie Mécanique de Toulouse (LGMT), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)
- Subjects
Engineering ,Cyclic stress ,fatigue life ,[SPI.MECA.MSMECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph] ,02 engineering and technology ,Thread (computing) ,0203 mechanical engineering ,General Materials Science ,multiaxial fatigue ,Gauss–Seidel method ,bolt ,business.industry ,Mechanical Engineering ,Fatigue testing ,Structural engineering ,Dang Van criterion ,021001 nanoscience & nanotechnology ,Fatigue limit ,020303 mechanical engineering & transports ,Mean stress ,[SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph] ,Mechanics of Materials ,Axial load ,Stress conditions ,0210 nano-technology ,business - Abstract
International audience; The fatigue behaviour of bolts under axial load has always been considered from the component point of view for which fatigue limit is usually taken equal to 50 MPa, and few results are available to designers for limited lifetimes. Here, we take up this problem from a material point of view using a local approach. For each case of fatigue testing, using finite‐element (FE) model of the bolt, we determine the stabilized local stress at the root of the first thread in contact with the nut. To characterize bolt behaviour with these numerical results, we use Dang Van multiaxial fatigue criterion for which we extend application to the medium fatigue life. These results can be correlated with the experimental numbers of cycles to failure to determine material parameters of the generalized criterion. Using statistical Gauss method, we can make lifetime predictions for any level of risk of failure. In addition, we propose an analytical model to rapidly determine the local stress condition from nominal loading data (mean stress and alternating stress). This model dispenses us from a new modelling if the bolt is stressed in the same manner as the bolts used for behaviour characterization. Using this model and the generalized criterion, it is extremely easy to make lifetime predictions whatever the risk considered.
- Published
- 2006
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