The Finite Element Method for Frame Structure with Fuzzy Elastic Connections

The connections of frame structure elements at a node are ofen an elastic connection between hinged and rigid.In this paper,the stiffness matrix and the loading transfer matrix of frame element with turn elastic connections is deduced,the cross shear effect has been taken into consideration simultaneously.The stiffness matrices of some bar elements,such as both ends of the bar are hinged or rigid and one end is hinged but the other is rigid,are special cases of the stiffness matrices presented in this paper.After pointing out that the elastic coefficient at a node of a bar element with elastic joint is really a fuzzy quantity,the fuzzy stiffness matrix of the bar element is obtained,and a solution to structural fuzzy finite element equilibrium equations is presented.The fuzzy solution obtained from above is not only containing the solution of ordinary finite element method but also providing some additional informations with practical value.[WT5HZ]     

Structural optimization design of the electric motorcycle frame

In order to analyze the performance of the electric motorcycle frame structure under working condition of vibration and reduce its weight,the transient finite element analysis model is developed with the theory of transient dynamics,and frame dynamic strength is calculated to obtain the maximum stress and stress distribution of frame under the working condition. On that basis,we establish the optimum model with the target function of the frame’s weight based on the optimal module of Hyperworks,and make optimization design of the frame under intensity and rigidity constraint conditions. The theory analysis and experimental results indicate that the frame has surplus strength and the value of safety factor is high under working condition of vibration ,and the strength of the optimized frame meets the requirements of safety and manufacturing process,meanwhile,the weight of frame is reduced by 12.1%,which shows that the optimization method is reliable and effective for the design of the structure of the frame.     

Section Optimization Design of Steel-Concrete Continuous Composite Beams Based on the Finite Element Method

This paper introduces the efficient computer aided design method to optimize the section of steel-concrete continuous composite beams by combining FEM for structure analysis with optimization arithmetic and an efficient shearing force link model of steel-concrete composite beams.The authors established a finite element analysis model,optimization parameter model,optimization mathematics model of steel-concrete continuous composite beams and programs analysis file and optimization control file by using the ANSYS parameter design language. The optimum of the steel-concrete continuous composite beams section is obtained after computing and the optimization result indicates that this method is efficient in optimizing the section of steel-concrete continuous composite beams.So it could be applied extensively in the steel-concrete continuous composite beams section optimization design.     

forming process planning and technology realization of the monoblock break beam frame

In order to meet the performance demands of train lorry, a die forging drawing method based on structure features analysis was proposed to form the L A break beam frame. The finite element method was used to simulate a series of die forging processes and the drawing processes with different parameters. The optimum cross section shape of the performing die was obtained from these simulation results. It is found that local back flow of the metal is the primary cause of necking defects in drawing. Furthermore, the best drawing speed is determined to be from 87 mm/s to 96 mm/s. The results of trial manufacturing and product detection indicate that employing a die forging drawing process to form the monobloc break beam frame is feasible.     

Dynamic Constitutive Model of Steel Fiber Reinforced Concrete and Its Finite Element Method

Taking the split Hopkinson pressure bar(SHPB) test data as training samples, an implicit dynamic constitutive model of steel fiber reinforced concrete(SFRC) was proposed with the improved BP neural network program. On the basis of ABAQUS/Explicit, a user defined material subroutine VUMAT was compiled with FORTRAN language, embedding with the neural network constitutive model into finite element calculation. With SFRC structure＇s response under impact load as case study, it is shown that the constructed constitutive model and its finite element method are effective.     

Using the Finite Element Method to Predict the Dispersed Shrinkage and Hot Tearing of the Pump Shell Castings

This paper has simulated numerically the 2D temperature field and stress field of main circle pump shell steel castings of nuclear power plant by finite element method,predicts the dispersed shrinkage,shrindage and hot hearing.The real dissecting pouring castings had the same results as the numerical simulation.At the same time the authors evaluat the molding design of the pump shell castings.     

Analysis and Design of Stigmata Upsetting Die

Upsetting, a typical hot deformation process, is simulated by using rigid-viscoplastic finite-element method, its instantaneous stress distribution over the interface between the die and workpiece being derived for the finishing upsetting stage. Based on these computations and in conjunction with elastic finite element method,die strength is then analysized. An optimization design for prestressed die inserts is adopted to decrease pressure being applied to the working surface of upsetting die,and in turn,to prolong its service life.     

Design calculation and finite element simulation analysis of stranded wire helical springs

The spatial structure of single wire is analyzed based on the forming process of stranded wire helical springs. Additionally,three parameters are derived from the existing foundation,including distribution circle radius of strand,spiral parameter of single wire and track scanning parameter. The aided design method of stranded wire helical springs based on feature scanning is put forward in which the centerline model of single wire can be obtained through one scanning step and the modeling method is given based on PROE code. The simulation analysis for spring in loading is performed by using ABAQUS code based on the calculation results. The finite element analysis results show the stress-strain ability of wire and the stress distribution of the section. The affects of loading rate on vibration of coils is also found.The results can make up for the deficiency of existing methods and give more beneficial assistance for production processing and performance test of the stranded wire helical springs.