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The flexural property and its synergistic mechanism of multibody molded beetle elytron plates

Science China(Technological Sciences) 2020年第5期63卷 768-776页

作者： YU XinDi ZHANG XiaoMing CHEN JinXiang ZHAO CaiQi ZHAO TiDong FU YaQin School of Civil Engineering Southeast UniversityNanjing 211189China College of Materials and Textiles Zhejiang Sci-Tech UniversityHangzhou 310018China

To improve the applications of beetle elytron plates(BEPs,which are biomimetic sandwich plates inspired by beetle elytra),the flexural performance and its synergistic mechanism of multibody molded BEPs were investigated via cantilever testing and finite element method(FEM).The results are summarized as follows.(1)Although debonding damage causes failure of the multibody molded BEPs and honeycomb plate and the reasonable range of trabecular size for BEPs is narrow,both the optimal loading capacity per mass and failure deformation of the BEPs are over two times those of the honeycomb plate.(2)A flexural synergistic mechanism is revealed in the trabecular-honeycomb core structure of BEPs;this mechanism causes the maximum deformation of core structure to gradually transfer from the honeycomb wall to the trabeculae with the increase inη(the ratio of the trabecular radius to the distance between the center points of two trabeculae),which means the different stretching behaviors in these core structures.(3)Unlike the compressive mechanism of BEPs,by controlling and balancing the deformation degrees of the trabeculae and honeycomb walls,the flexural mechanism achieves a minimum core deformation and an optimal flexural *** results suggest a qualitative relationship between the deformation behavior of trabecular-honeycomb core structure and bending performance of the whole BEP,and provide a solid foundation for subsequent research and the considerable application potential of this biomimetic sandwich structure in many fields.

关键词： beetle elytra BEP biomimetic structure sandwich structure honeycomb plate flexural property

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Morphologies evolution and mechanical behaviors of SiC nanowires reinforced C/(PyC-SiC)_(n)multilayered matrix composites

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Journal of Materials Science & Technology 2022年第1期96卷 190-198页

作者： Xinfa Tian Hejun Li Xiaohong Shi Hongjiao Lin Ningning Yan Tao Feng State Key Laboratory of Solidification Processing Carbon/Carbon Composites Research CenterNorthwestern Polytechnical UniversityXi’an 710072China School of Mechanics Civil Engineering&ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China

SiC nanowires reinforced C/(PyC-SiC)_(n)multilayered matrix composites(SM-CS for short)were prepared by combined with sol-gel and chemical vapor infiltration(CVI)***,(PyC-Si OC);multilayered structure was formed by cycles of impregnation and *** SiOC was transformed into SiC by heat-treatment,and(PyC-SiC)_(n)multilayered structure would be *** the same time,the PyC layer which was designed as the outmost layer could decrease gas supersaturation to form in-situ tubular SiC nanowires on the surface of multilayered *** results of three-point bending test showed that the maximum force of SM-CS composites was increased by the number of cycles of the preparation process,which were up to enhanced by 74.38%compared with C/C composite *** fracture surface showed that the improvement was due to the multiscale reinforcing system of(PyC-SiC)_(n)multilayered structure and SiC *** structure can protect carbon fibers and release stress concentration by induction of *** the mechanical interlocking effect of SiC nanowires could reinforce bonding force of the remaining matrix.

关键词： C/C Multilayered structure SiC nanowires flexural property

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Microstructure and Mechanical Properties of Tortoise Carapace Structure Bio-Inspired Hybrid Composite

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Acta Metallurgica Sinica(English Letters) 2018年第9期31卷 945-952页

作者： Bao-Shuai Han Yan-Jin Xu En-Yu Guo Tao Jing Hong-Liang Hou Liang-Shun Luo AVIC Manufacturing Technology Institute BeijingBeijing 100024China School of Materials Science and Engineering HarbinInstitute of TechnologyHarbin 150001China School of Materials Science and Engineering DalianUniversity of TechnologyDalian 116024China School of Materials Science and Engineering TsinghuaUniversityBeijing 100084China

A turtle carapace bio-inspired Ti matrix hybrid composite was successfully fabricated in this work. This composite incorporates two parts： the Ti-Al intermetallic multilayered composite and continuous SiC fibers-reinforced Ti matrix composite. In the Ti-Al intermetallic multilayered composite part, a series of Ti-Al intermetallics compounds, including Ti3Al, TiAl, TiAl2 and TiAl3, were formed between the Ti layers. In the continuous SiC fibers-reinforced Ti matrix composite part, SiC fibers and Ti matrix were found to be bonded well through weak interface reaction. flexural strength of this material reached 1.21 ±0.16 GPa, measured by three-point bending test. The deformation features suggest that the hierarchical structure combining ductile Ti layers/matrix with brittle high-strength Ti-Al intermetallics layers/SiC fibers can effectively enhance the mechanical properties of the bio-inspired hybrid composite.

关键词： Bio-inspired composite Hierarchical structure Cracks propagation flexural property

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Study of microstructure and flexural properties of microcellular acrylonitrile-butadiene-styrene nanocomposite foams: experimental results

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Applied Mathematics and Mechanics(English Edition) 2015年第4期36卷 487-498页

作者： A.MOHYEDDIN A.FEREIDOON I.TARAGHI Department of Mechanical Engineering Parand BranchIslamic Azad University Department of Mechanical Engineering Semnan University

In this paper, acrylonitrile-butadiene-styrene （ABS） nanocomposite foams are produced using carbon dioxide through the solid-state batch process. Microcellular closed-cell foams are produced with the relative density ranging from 0.38 to 0.97. The effects of the processing conditions on the density, morphology, and flexural properties of ABS and its nanocomposite foams are studied. It is found that nanoclay particles, as nucleating sites, play an important role in reducing the size of cells and increasing their number in the unit volume of foamed polymer, as well as increasing the flexural modulus of foam through reinforcing its matrix.

关键词： acrylonitrile-butadiene-styrene (ABS) polymer-clay nanocomposite mi-crocellular foam flexural property

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Preparation and flexural properties of biomimetic laminated boards made from starch and maize stalk fiber

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International Journal of Agricultural and Biological Engineering 2009年第2期2卷 24-31页

作者： Zhang Fu Wu Na Tong Jin Zhou Jiang Yang Xin Ma Yunhai Chen Donghui Sun Jiyu College of Vehicle and Motive Power Engineering Henan University of Science and TechnologyLuoyang 471003China Department of Automotive Engineering Shandong Jiaotong UniversityJinan 250023China Key Laboratory of Terrain-Machine Bionics Engineering(Ministry of Education China)and College of Biological and Agricultural EngineeringJilin University at Nanling CampusChangchun 130025China College of Mechanical and Electrical Engineering Hebei Agricultural UniversityBaoding 071001China

In this study,maize stalk tegument separated from the maize pith was crushed to obtain the *** cross-linking maize starch adhesives considering four main factors(water content,gelatinization temperature,NaOH as gelatinization agent and Na2B4O7·10H2O as cross-linking agent)with three levels were prepared based on an orthogonal test scheme L9(34)in order to increase the water-resisting property and the bonding strength of the common maize starch *** bonding properties of maize starch adhesives were characterized using shearing strength under compression *** models of fiber reinforced composites were established according to the microstructure analysis of the four species of insects’elytra including Protaetia orentalis,Copris ochus Motschulsky,Anoplophora chinensis and Cytister bengalensis Aube,which will provide the biomimetic models for the biomimetic laminated *** maize stalk fiber biomimetic laminated boards were prepared based on the structural models of the elytra *** flexural strength and flexural elastic modulus of the biomimetic boards were *** results showed that the flexural strengths of the single layer jute fiber,-reinforced maize stalk fiber boards and the dual layer jute fiber reinforced maize stalk fiber boards are higher than those of the common maize stalk fiber boards and the other three groups of jute fiber hybrid reinforced stalk fiber boards because of the biomimetic laminated design.

关键词： maize stalk biomimetic elytra starch laminated board flexural property

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