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Contribution à l'identification du comportement des matériaux à partir d'essais de micro-impact répétés

Abstract : The behavior law is an essential element of the mechanical characterization of materials. To identify the material behavior several experimental methods can be used such as (static traction, Hopkinson bars ...) that allow to obtain mechanical laws applied under well-defined conditions, i.e. on homogeneous and bulk materials. However, do to the rising cost of these tests and their specific sample geometry, their use is limited and does not allow to probe and measure all types of materials (like coatings or porous materials....). Moreover, a broad knowledge of their properties allows a more accurate simulation of their behavior in working process. Behavior laws appropriate for bulk material do not always fit to process modeling shot peening, due to surface deformation. The main objective of this study is to develop a simple, rapid method for identifying the local behavior of materials under dynamic conditions, in order to characterize surfaces under impact loading. An inverse method has been developed to identify the behavior of materials using a combination of numerical and experimental approaches of repeated impact tests. The behavior laws obtained by the inverse method must be further investigated due to missing comparison data in literature. A comparison with an analytical method based on the theory of indentation must be carried out for more accuracy. In order to validate the efficiency of the inverse method and the analytical method, numerical blind tests wereconducted, then applications on industrial and ideal materials have been carried out to determine the limits.
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  • HAL Id : tel-01875383, version 1

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Halim Al Baida. Contribution à l'identification du comportement des matériaux à partir d'essais de micro-impact répétés. Matériaux. Université de Technologie de Belfort-Montbeliard, 2015. Français. ⟨NNT : 2015BELF0274⟩. ⟨tel-01875383⟩

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