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Computational design for 4D printing of topology optimized multi-material active composites

npj Computational Materials 2023年第1期9卷 2342-2350页

作者： Darsh.n Ath.narayanarao romaric prod’h.n Dominique Chamoret h.Jerry Qi Mahdi Bodaghi Jean-Claude André Frédéric Demoly ICB UMR 6303 CnRS Univ.Bourgogne Franche-ComtéUTBM90010 BelfortFrance The George W.Woodruff School of Mech.nical Engineering Georgia Institute of TechnologyAtlantaGA 30332USA Department of Engineering School of Science and TechnologyNottingham Trent UniversityNottingham NG118NSUK LRGP UMR 7274 CnRS University of LorraineNancyFrance

Recent efforts on design for four-dimensional(4D)printing have considered the spatial arrangement of smart materials and energy *** development of multifunctional structures and their desired mech.nical/actuation performances require tackling 4D printing from a multi-material design *** the materials distributions there is an opportunity to increase the spectrum of design concepts with computational *** main goal being to achieve the“best”distribution of material properties in a voxelized structure,a computational framework that consists of a finite element analysis-based evolutionary algorithm is *** fuses the advantages of optimizing both the materials distribution and material layout with.n a design space via topology optimization to solve the inverse design problem of finding an optimal design to achieve a target shape ch.nge by integrating void *** results demonstrate the efficacy of the proposed method in providing a highly capable tool for the design of 4D-printed active composites.

关键词： composites printing topology

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Comparing the Effectiveness of Coatings on Carbide andCermet Cutting Tool Inserts

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Journal of Materials Science & Technology 1995年第4期11卷 269-275页

作者： K.h. W.Seah M.Rahman and C.h.Lee (Dept. of Mech. & prod. Eng., national University of Singapore, 10 Kent Ridge Crescent, Singapore 0511 T.n.Goh (Dept. of Ind. & Sys. Eng., national University of Singapore, 10 Kent Ridge Crescent, Singapore 0511) national Univ of Singapore Singapore

A series of metal cutting experiments was performed on a CnC lathe to evaluate the performance of various coatings on different tool substrates. The workpiece material was plain medium carbon steel and the cutting tool materials were carbide and cermet inserts coated with various single as well as multilayer coatings. Mach.ning was done under various cutting conditions of speed and feed-rate, and for various durations of Cutting. The output parameters studied were the cutting forces (axial, radial and tangential), the surface roughness of the workpiece, as well as the tool wear (crater and flank wear). From these results, the performances of the various cutting inserts are evaluated and compared. Results show that cutting forces are significantly lower wh.n using coated cermets th.n wh.n using coated carbides although different coatings on the same substrate also result in different cutting forces. however, there is less difference in the surface roughness of the finished workpiece for the various coatings and substrates.

关键词： Tool Comparing the Effectiveness of Coatings on Carbide andCermet Cutting Tool Inserts

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