ABSTRACT In order to enhance the quality and mechanical properties of 3D printing carbon fiber reinforced composite (CFRP) workpiece, this paper prepares 3D printing CFRP laminates by proposing a layered coherent composite scanning path, and carries out orthogonal tests and single factor tests to disclose the effects of different process parameters (i.e., layer thickness, first layer thickness, nozzle temperature and printing speed) on the mechanical performance of the CFRP workpieces. Moreover, The grey relation analysis method is used to analyze the multi-objective parameters of the orthogonal tests results and the process parameters of 3D printing CFRP are optimized based on the tests results. The research results show that the process parameters of 3D printed CFRP can be ranked as delamination thickness, nozzle temperature, first layer thickness and printing speed, in descending order of the impact on the mechanical property of the CFRP laminates. the optimal process parameters for 3D printing include a layer thickness of 0.25 mm, a first layer thickness e of 0.2 mm, a nozzle temperature of 180°C, and printing speed of 45 mm/s. Under this parameter combination, the tensile strength, bending strength, and the interlaminar shear strength (ILSS) of the samples are 52.77 MPa, 276.63 MPa and 38.56 Mpa respectively, and the grey correlation degree increased to 0.845. D (CFRP workpiece path i.e., ie i (i.e. workpieces Moreover multiobjective multi objective 025 0 25 mm 02 2 0. 180C C 180 180°C 4 mms s mm/s combination ILSS (ILSS 5277 52 77 52.7 27663 276 63 276.6 3856 38 56 38.5 respectively 0845 845 0.845 i.e. (i.e 18 527 5 7 52. 2766 27 6 276. 385 3 38. 084 84 0.84 i.e 1 08 8 0.8

ABSTRACT Carbon fiber reinforced aluminum laminates (CARALL) are often subjected to bending loads in actual working conditions, resulting in some imperceptible intra-layer or inter-layer damages, such as matrix cracking, fiber fracture and inter-layer delamination, which degrade the mechanical properties of the structure. In this paper, the bending performance and damage mechanism of CARALL are tested and simulated by finite element simulation. Firstly, the mechanical properties are analyzed by three-point bending test, and the fracture morphology of the specimen after failure is photographed by scanning electron microscope, and the failure damage state from the microscopic perspective is analyzed. Secondly, the VUMAT subroutine with built-in three-dimensional Hashin criterion is introduced into ababqus. By comparing the finite element simulation and experimental results, the rationality and accuracy of using VUMAT subroutine to predict the failure behavior of Al-CFRP-Al laminates are verified. The results show that during the bending failure process, the aluminum alloy layer suffered local damage, and the carbon fiber layer suffered a large area of damage. The layer near the indenter was subjected to large stress concentration during bending, resulting in intensified interlayer interaction and serious damage. The crack began to expand downward along the stress and gradually became smaller as it expanded. The research results provide basic data reference for the bending performance and damage mechanism of fiber metal laminates (FMLs), and have important engineering application value for the optimization design of related structures. (CARALL conditions intralayer intra inter damages cracking delamination structure paper Firstly threepoint three point test microscope Secondly builtin built threedimensional dimensional ababqus AlCFRPAl Al CFRP verified process expanded FMLs, FMLs , (FMLs) structures (FMLs

Abstract Gestational diabetes mellitus (GDM) is highly prevalent worldwide, with an estimated 10-15% percent of pregnancies affected. Increasing evidence indicates that functional food ingredients (FFIs) may help relieve GDM via multiple mechanisms, such as eliminating free radicals, downregulating inflammation, promoting insulin secretion and signaling, targeting hepatic gluconeogenesis and glycogen storage metabolism, and regulating the intestinal microflora. In this article, the effects of functional food ingredients on GDM and the possible underlying mechanisms of action are reviewed. This review provides reference information that can be useful for the development of novel functional supplements for the control of GDM.