Damage quantification in aluminium alloys using in situ tensile tests in X-ray tomography |
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Authors: | Eric Maire Suxia Zhou Jerome Adrien Marco Dimichiel |
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Affiliation: | aUniversite de Lyon, INSA-Lyon, MATEIS CNRS UMR5510, 7 Avenue Jean Capelle, F-69621 Villeurbanne, France;bEngineering Research Center of Structure Reliability and Operation Measurement Technology of Rail Guided Vehicles, Ministry of Education, School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044, China;cEuropean Synchrotron Radiation Facility, ID15 Beam Line, 6 rue Jules Horowitz, 38000 Grenoble, France |
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Abstract: | This paper presents results obtained using in situ tensile experiments allowing the observation of damage nucleation, growth and coalescence. Three different aluminium alloys (2024, 7449 and 5754) exhibiting various mechanical properties were chosen to produce a wide data base. Smooth and notched axisymetric samples were cut out of the raw materials to introduce different levels of initial stress triaxiality using the geometry of the samples. In the different cases, the damage steps (initiation, growth and coalescence) were clearly visualised during interrupted and continuous in situ tensile tests in synchrotron X-ray tomography. The imaging was performed with a voxel size of 1.6 μm. The X-ray tomography method also gives a precise image of the outer shape of the sample and its change during deformation can then be analysed. This allows to calculate precisely the true strain vs true stress curve and also an approximation of the stress triaxiality using the Bridgman formula. The results show that damage can be visualised but also quantified precisely in the different cases in terms of nucleation and growth, coalescence being also evident in the results but still hard to quantify so far. Finally, a previously developed model for damage growth during ductile straining based on the Rice and Tracey approach can be fitted to the results. |
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Keywords: | Tension test Synchrotron radiation X-ray tomography Aluminium alloys Fracture |
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