Fast prediction of the fatigue behavior of short-fiber-reinforced thermoplastics based on heat build-up measurements: application to heterogeneous cases
| Autor: | Leonell Serrano, Pierre Charrier, Gilles Robert, Yann Marco, Vincent Le Saux |
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| Přispěvatelé: | École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne), Institut de Recherche Dupuy de Lôme (IRDL), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Centre National de la Recherche Scientifique (CNRS), Solvay, Trelleborg Modyn, Trelleborg, Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université de Bretagne Sud (UBS) |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Field (physics) Short-fiber-reinforced thermoplastics General Physics and Astronomy 02 engineering and technology [SPI]Engineering Sciences [physics] 0203 mechanical engineering Thermal medicine General Materials Science Fatigue Structural material business.industry Stiffness Structural engineering Dissipation 021001 nanoscience & nanotechnology 020303 mechanical engineering & transports Thermal measurements Local analysis Mechanics of Materials medicine.symptom 0210 nano-technology business Energy (signal processing) Vibration fatigue |
| Zdroj: | Continuum Mechanics and Thermodynamics Continuum Mechanics and Thermodynamics, Springer Verlag, 2017, 29 (5), pp.1113-1133. ⟨10.1007/s00161-017-0561-2⟩ |
| ISSN: | 1432-0959 0935-1175 |
| Popis: | International audience; Short-fiber-reinforced thermoplastics components for structural applications are usually very complex parts as stiffeners, ribs and thickness variations are used to compensate the quite low material intrinsic stiffness. These complex geometries induce complex local mechanical fields but also complex microstructures due to the injection process. Accounting for these two aspects is crucial for the design in regard to fatigue of these parts, especially for automotive industry. The aim of this paper is to challenge an energetic approach, defined to evaluate quickly the fatigue lifetime, on three different heterogeneous cases: a classic dog-bone sample with a skin-core microstructure and two structural samples representative of the thickness variations observed for industrial components. First, a method to evaluate dissipated energy fields from thermal measurements is described and is applied to the three samples in order to relate the cyclic loading amplitude to the fields of cyclic dissipated energy. Then, a local analysis is detailed in order to link the energy dissipated at the failure location to the fatigue lifetime and to predict the fatigue curve from the thermomechanical response of one single sample. The predictions obtained for the three cases are compared successfully to the Wöhler curves obtained with classic fatigue tests. Finally, a discussion is proposed to compare results for the three samples in terms of dissipation fields and fatigue lifetime. This comparison illustrates that, if the approach is leading to a very relevant diagnosis on each case, the dissipated energy field is not giving a straightforward access to the lifetime cartography as the relation between fatigue failure and dissipated energy seems to be dependent on the local mechanical and microstructural state. |
| Databáze: | OpenAIRE |
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