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Multi-scale study of mechanical behaviour of two-phase materials during large deformation and ductile damage

Abstract : The thesis is dedicated to the study of elasto-plastic behavior of multiphase polycrystalline materials and ductile damage at different scales. The microscopic heterogeneities have important influence on the macroscopic mechanical behavior of materials. Ductile damage is still difficult to measure at small scales. The following issues are the main topic involved in this thesis: 1. The evolution of mechanical behavior in phases and groups of grains, under external load until fracture.2. The influence of intrinsic heterogeneity on the macroscopic behavior of two-phase materials.3. The influence of necking and ductile damage, on the behavior of grains with different orientation families.4. The indirect measurement of ductile damage at small scales by diffraction. To answer these questions, duplex steels and two-phase titanium are tested. The diffraction method is used to perform in situ measurements during tensile test until fracture. Predictions are carried out by an elasto-plastic self-consistent model, in which ductile damage have been integrated. Experimental data on different scales are compared with these predictions. In addition, nano-indentation tests are carried out to study the evolution of phases’ mechanical properties along the neck until fracture edge. Microscopic images were also taken in order to observe the fracture surfaces of studied materials
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Submitted on : Thursday, October 15, 2020 - 7:35:07 PM
Last modification on : Friday, October 16, 2020 - 3:29:26 AM

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  • HAL Id : tel-02968552, version 1

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Yuchen Zhao. Multi-scale study of mechanical behaviour of two-phase materials during large deformation and ductile damage. Materials and structures in mechanics [physics.class-ph]. Université de Technologie de Troyes, 2017. English. ⟨NNT : 2017TROY0018⟩. ⟨tel-02968552⟩

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