GOOD PUBLISHING PRACTICES. PNAS offers quick turn-around times: the initial decision is taken in about 40 days; the average time between acceptance and publication online is one month; and the average time between submission and publication (including the print edition) is less than 6 months.PNAS papers can be freely accessed 6 months after publication, and many other types of. Guide to Using PNAS One andTwo Column Journal Styles Welcome to the use of PNASone and PNAStwo, the LATEX style files for typesetting articles to appear in the Proceedings of the NationalAcademy of Sciences of the United States ofAmerica. PNASone.cls produces one column articles, while PNAStwo.cls produces two column articles.
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Lattice/cell structures have relatively high characteristics of rigidity and strength, excellent thermal insulation properties, energy absorption characteristics, and high fatigue resistance. The use of this type of structure in engine part construction opens up new opportunities for advanced aviation applications. However, the deformation behavior of porous and metallic structures differs significantly from that of conventional homogeneous materials. Samples with cellular and porous structures are themselves designs. Therefore, procedures for strength testing and interpretation of experimental results for cellular and porous structures differ from those for samples derived from homogeneous materials. The criteria for determining the properties of cellular structures include density, stiffness, ability to accumulate energy, etc. These parameters depend on the configuration of the cells, the size of each cell, and the thickness of the connecting elements. Mechanical properties of cellular structures can be established experimentally and confirmed numerically. Special cellular specimens have been designed for uniaxial tensile, bending, compression, shear, and low-cycle fatigue testing. Several variants of cell structures with relative densities ranging from 13 to 45% were considered. Specifically, the present study examined the stress-strain states of cell structures from brands 'CobaltChrome MP1' powder compositions obtained by laser synthesis on an industrial 3D printer Concept Laser M2 Cusing Single Laser 400W. Numerical simulations of the tests were carried out by the finite element method. Then, the most rational cellular structures in terms of mass and strength were established on the basis of both real and numerical experiments.