Deformation and Stress Analysis of Cold Sprayed Al-Al2O3 Composite Coating on Magnesium Alloy under Different Stress States
In order to study the mechanical response of cold sprayed Al-Al2O3 composite coatings on magnesium alloys under different stress states,the fixed-point pressing model,tensile model and friction model(the mass fractions of Al2O3 are 0%,15%,30%,45%respectively)of Al-Al2O3 composite coatings on AZ31B magnesium alloys are constructed using ABAQUS finite element software.The randomness of particles appearing in the cold spray experiment is characterized accordingly,and stress distribution and its type of the coating are analyzed under different stress states,in order to obtain the potential failure mechanism of the composite coating and the relationship between the stress under different stress(tension,compression,friction)states.The research shows that under three different stress conditions,the stress concentration phenomenon is located at or near the edge of Al2O3 particles,and the stress reaches the maximum value near the minimum radius of curvature,but different stresses will lead to different types of stress.After friction,the residual stress of the outermost layer of the coating is tensile stress,the subsurface layer is compressive stress,and the lowermost layer of the coating is tensile stress,and the average residual tensile stress of the outermost layer increases with the increase of Al2O3 content.The research results of this paper can provide theoretical guidance for coating design and material selection,and also provide reference for related application fields.
cold spraycomposite coatingstress concentrationfinite element
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