Structural parameters influence on the inhomogeneous sample physical and mechanical properties under the compressive load

The additive technology main feature lies in a possibility to create heterogeneous products consisting of various materials or having different properties in their separate parts. Correct approach to designing the heterogeneous structures makes it possible to achieve not only a decrease in the product mass, but also to preserve its strength properties. However, loading such structures causes its local deformation, which could negatively affect physical and mechanical properties of the entire product. The paper considers porous cells manufactured by the layer-by-layer fusion. In this case, cubic samples were used with an ellipsoidal pore and different ellipticity angle. Three types of full-scale tests were carried out for each cell type. The first test was performed for uniaxial compression on a testing machine, the second - for uniaxial compression accompanied by the sample registration in an X-ray computer tomograph at the loading different stages. The sample in the third test was loaded until plastic deformation in the testing machine; after that the sample was registered in the X-ray computer tomograph. In each cell type, approximating curves were obtained for the elastic modulus, proportionality limit, lower and upper yield points, as well as for the structural parameters at each loading step. Under elastic deformations, mesoporosity chaotic distribution was observed, which significantly affected values ??of the elastic characteristics. That quantitatively affected the linear approximation determination coefficient of the Young’s modulus and the proportionality limit. However, obvious linear dependence of the ellipticity direction influence on the lower and upper yield points was observed under the plastic deformation.
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