Study On Flexural Behavior Of Integrated Material By Corn Stalk Recombined Material Beam Members

The development of the construction industry leads to the rise of wood structure buildings,which increases the demand for wood.There is a shortage of wood resources in China.Relying on imported wood will waste a lot of money,and the large use of wood does not conform to the concept of green sustainable development in China.According to the production technology of glued wood,integrated material by Corn Stalk Recombined Material,a new type of substitute wood material,has emerged.It has the advantages of high density,high wear resistance,high strength,good stability,good plasticity and moth resistance.In order to make integrated material by Corn Stalk Recombined Material be extended to practical engineering,it is necessary to study the mechanical properties of different components.In this paper,integrated material by Corn Stalk Recombined Material bending specimens are taken as the research object,and the bending performance of beam specimens with different integration modes is compared by ABAQUS finite element simulation and test,and the influence of different integration modes on the mechanical properties of the specimens and the bending failure mechanism are analyzed.Firstly,the bending simulation of integrated material by Corn Stalk Recombined Material beam is carried out by ABAQUS finite element simulation software,and the stress cloud diagram,load displacement curve,load strain relationship curve and strain change curve along the section height are analyzed.During the initial loading process,the load displacement and load strain curves show a linear growth;With the increase of load,the vertical displacement in the middle of the span increases faster.In the later stage of loading,the slope of load displacement curve and load-strain curve decreases,showing a nonlinear growth.The strain of each point along the section height increases proportionally to the neutral axis.The maximum stress value of the whole loading process is located in the pure bending section in the middle of the span.The bearing capacity of vertical integration is the best.Secondly,the test scheme,preparation,instrument and process of integrated material by Corn Stalk Recombined Material beam are described.Then,the bending performance of integrated material by Corn Stalk Recombined Material beam specimens under three different integration modes is studied,and the load displacement curve,load strain relationship curve and strain change curve along the section height are drawn and analyzed,The bending deformation and failure mechanism of integrated material by Corn Stalk Recombined Material beam specimens are revealed.The test results show that the brittle failure occurs in the specimen,and the sound of fiber fracture occurs in the late stage of failure,and the failure position is in the pure bending section in the middle span;In the early stage of loading,from the analysis of load displacement curve and load strain relationship curve,the displacement and strain increase with the load in a positive proportion,but in the later stage they increase nonlinearly;Through the analysis of the strain curve along the height of the section,it is found that the curve is approximately linear,and the specimen basically conforms to the plane section assumption;In terms of bearing capacity,the vertical integration mode increased by 37.55% and 68.88% compared with the horizontal integration mode and combined integration mode.The results show that the bending resistance of the beam specimens in vertical integration mode integrated material by Corn Stalk Recombined Material is the best.Finally,the results of bending test and Simulation of integrated material by Corn Stalk Recombined Material beam are compared,and the results show that the two are in good agreement.The results show that the anisotropic method can simulate the bending performance of integrated material by Corn Stalk Recombined Material beam specimen better,and puts forward the appropriate constitutive model according to the assumption of plane section,and then deduces the formula of bending bearing capacity of integrated material by Corn Stalk Recombined Material beam.