Compression Performance Of Pineapple Leaf Fiber Reinforced Lattice Cylinder

Natural fibers have some advantages,such as abundant,green,biodegradable,which has attracted the attention of people.And a new research direction for scholars is that natural fibers are used as structural material.The design of lattice structure contains material design,structural design and functional design simultaneously,so lattice structure is considered to be one of the most prospective new materials.The view of this paper is to achieve the combination of material design and structural design.So pineapple leaf fibers reinforced lattice cylinder structure is fabricated.In this paper,preparation technology of pineapple leaf fibers reinforced lattice cylinder structure is explored at first,and performance parameter of pineapple leaf fibers reinforced composite is tested;after that,the compression property of pineapple leaf fibers reinforced lattice structure is explored by experimental test,theoretical analysis and finite element analysis,and lattice cylinder structure is optimized by finite element model;then the effects of unit cell configuration and cylinder layers on the compression performance of pineapple leaf fiber reinforced lattice structure are explored;at last,pineapple leaf fiber/glass fiber reinforced lattice cylinder with sandwich ribs is manufactured with different combination forms of pineapple leaf fiber and glass fiber,and the compression property of lattice cylinder with sandwich ribs is explored.For the preparation process of pineapple leaf fiber reinforced lattice cylinder,the design of cylinder structure is made at first,which contains configuration design and dimensional design;after that,wood mold is manufactured according to the design dimension parameters of lattice cylinder;silicon rubber mold is fabricated by using rigid wood mold;finally,lattice cylinder structure is made using filament winding method.For the performance of pineapple leaf fiber reinforced composite,fiberboard composite is manufactured at first,and the tensile performance of fiberboard is tested to obtain the tensile elastic constants of pineapple leaf fiber reinforced composite;after that,pineapple leaf fiber ribs are made,and the compression performance of fiber ribs are tested to obtain the compressive modulus and compressive strength of pineapple leaf fiber reinforced composite.Experimental test method,theoretical model and finite element model are adopted to analysis the compression performance of pineapple leaf fiber reinforced lattice cylinder.Experimental results show that the main failure forms of lattice cylinder structure focus on the delamination and fracture of circular rib segments adjacent to the crossover;the bonding force between pineapple leaf fibers and phenol formaldehyde resin contains physical bonding and chemical bonding,which can be seen by FTIR spectra;the predicted failure parts of lattice structure by finite element model is similar to experimental phenomena,and the ultimate bearing capacities of lattice cylinders by test are 73-84%of predictive value,which shows the validity of finite element analysis;for axial displacement of lattice cylinder,the predictive values of finite element model and theoretical model are similar and are 77-96%of experimental values.After confirming the feasibility of finite element model,an orthogonal experiment is designed,and finite element model is used to analyze some parameters of pineapple leaf fiber reinforced lattice cylinder structure,which can help to explore the primary and secondary sequence of different factors under a certain condition,and optimize structural design.For the effect of unit cell configuration on the compression performance of pineapple leaf fiber reinforced lattice cylinder structure,3 different configurations of lattice cylinder are designed at first,which are stretching dominated small triangle(type I),bending dominated diamond(type II)and stretching dominated big triangle(type III)respectively.The performances of lattice cylinders are analyzed and studied by axial compressive test and finite element model.The results show that the design of type I structure is the most reasonable;type II and type III structures occur global buckling in the process of carrying load.For the effect of cylinder layers on the compression performance of pineapple leaf fiber reinforced lattice structure,3 different layers of lattice cylinder are designed at first,which are 3 layers,4 layers and 5 layers respectively.The performances of lattice cylinders are analyzed and studied by axial compressive test and finite element model.The results show that the mechanical properties of lattice cylinders with 3 layers and 4 layers have been well exerted;the property of lattice cylinders with 5 layers is not fully exerted because of the poor quality of the top and bottom surfaces.For the compression performance analysis of pineapple leaf fiber/glass fiber reinforced lattice cylinder with sandwich ribs,3 different combination forms of lattice structure are designed at first,namely structure(PG)_n,PGP and GPG,where P and G represent pineapple leaf fiber and glass fiber respectively.The mechanical properties of lattice cylinder with sandwich ribs are analyzed and studied by axial compressive test,and the results show that the failure parts of(PG)_n,PGP and GPG lattice cylinders with sandwich ribs focus on circumferential and helical ribs adjacent to the crossover;in compression resistance perspective,compared with structure PGP and GPG,the superiority of structure(PG)_n is smaller;in lightweight and high strength perspective,the property of PGP lattice cylinder is best,the GPG lattice cylinders’takes second place,and(PG)_n is the worst.Pineapple leaf fiber reinforced lattice cylinder structure is lightweight and high strength,acceptable specific strength/stiffness,and functional material can be put into the connected space of lattice cylinder,so the structure can be used in construction,civil and other fields,for example,floor.Pineapple leaf fiber reinforced lattice cylinder structure can carry load as structure all by itself,and it can also be designed again as an infrastructure.Parallel to the cylinder’s axial direction,when the outside of cylinder is added faces,grid stiffened structure can be manufactured;parallel to the cylinder’s axial direction,when the inside and outside of cylinder are added faces,lattice sandwich structure can be manufactured;normal to the cylinder’s axial direction,when the top and bottom surfaces of cylinder are added faces,hierarchical sandwich structure can be manufactured.The exploration on mechanical property of pineapple leaf fiber reinforced lattice cylinder structure can guide the research and application on biomass-based lattice structure.