Numerical Test of Crack Propagation Path in Asphalt Beam Using Coupled Extended Finite Element with Field Variable Method
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Based on extended finite element coupled with field variable method, fatigue damage numerical test of three point-bending beam with initial notch has been made to predict crack propagation path, numerical results showed : under the fatigue loading with 200Hz, and amplitude is 20KN, length of crack expanding was the biggest and crack grew as some angles with the initial crack during the first loading, crack propagated parallel to the initial angle during the other loading cycle. These results can fit the experiment very well. Using Fortran, A new user subroutine named USDFILD (User subroutine to redefine field variables at a material point) was also provided on the platform of ABAQUS, which can modal the change of physic material with time. This user subroutine can also import fatigue characterize of material into the model.Keywords:
Subroutine
Fortran
The finite element model for the monocoque bus / coach body frame is built in ANSYS software with shell and beam elements, and the finite element model is validated by stress test. The stiffness and strength analysis are carried out in typical working conditions of bend, torsion and torsion with brake. Modal analysis is performed, which lays the foundation for subsequent transient response analysis.
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For the purpose of analyzing the nonlinear viscoelasticity with damage for solid rocket motor(SRM) grain,based on a 3-D nonlinear viscoelastic constitutive model with damage evolution,the incremental finite element form was derived with numerical integral arithmetic and the stress updating methods were presented in an increment according to numerical iteration methods of Newton-Raphson by solving these nonlinear equations.The corresponding material subroutine was developed with Fortran code based on secondary development of Abaqus software.Moreover,the present numerical method and subroutine were verified through analytical solutions of typical examples.Cases study indicates that the finite element solutions with material subroutine is in good agreement with the analytical ones and keeps high accuracy.The methods and subroutine,which have been proved to be of validity in this study,may be applied to structural analysis for practical SRM grain.
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Fortran
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It's forces under the joint working conditions in bending and torsion stress are analyzed by finite element analysis soft ware ANSYS.While the truck is running on the bumpy road.the causes of the sub-frames' fatigue crack is identified,and its structure is improved and optimized.This analysis method provides important reference for the structure design and improving of the truck's frame,which working in mining and other wild places.
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This paper brings to view a new passive approach regarding the reduction of the flexible carbody vertical bending vibration of railway vehicles via two anti-bending bars fixed onto the longitudinal beams of a carbody underframe. The anti-bending bars operate as elastic elements limiting the rotation of the carbody cross-sections and thus increasing the bending carbody frequency. The anti-bending bars are dimensioned so that the frequency of the first bending mode of the carbody to be convenient in terms of ride comfort. The effectiveness in the use of the anti-bending bars is proven by the lowering of the vibration level and improvement of the vehicle ride comfort.
Limiting
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Subroutine
Fortran
Position (finance)
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Taking an in-service jacket platform as an example,this paper studies the simplified fatigue analysis method for the skirt pile sleeve(which is a complex non-tubular joint structure) of a jacket platform subjected to wave load.SACS software was used for global structural analysis for the jacket platform under multi-directional wave loads,the load case set and loads and boundary conditions needed in the simplified FEM fatigue analysis were chosen,then ALGOR software was used to build a finite element model and perform finite element analysis.After stress output post-processing,the fatigue analysis results were obtained.This simplified fatigue analysis method and its analytical results were recognized by DNV,that means the simplified fatigue analysis method is effective and can be used in fatigue design for the non-tubular joint structure of an offshore jacket.
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According to the structural characteristics of the girder of the bridge crane,a finite element mechanical model of the girder of 30t bridge crane is built with ANSYS,and the finite element analysis of the structure is carried out.On the basis of the finite element analysis,the optimized mathematical model of the girder is established,and the structural optimization design is completed in ANSYS with satisfactory results.The study offers beneficial references for the structural design of the girder of the bridge crane.
Bridge (graph theory)
Girder bridge
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A finite element method for determining structural displacements resulting from electrostatic forces
A finite element approach has been developed to help solve the problem of structural displacement due to forces from electrostatic attraction. The method can be applied to typical MEMS structures such as diaphragms, beams, etc. where the charge carrying surfaces can be approximated as nearly parallel. The user subroutine capability of the commercially available ABAQUS finite element code is used. This capability allows a non-uniform, position dependent, load to be applied at each integration point during the stress/displacement analysis. The load value is determined by a user written FORTRAN subroutine.< >
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Fortran
Position (finance)
Code (set theory)
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Displacement method
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This article presents the results of the computer simulations of a four-point bending test of a concrete single-edge notched beam. In this publication, the authors compared the X-FEM method of simulating the crack in the Abaqus FEA system. The paper also contains the results obtained with the Abaqus subroutine recently developed by the authors, used for defining the direction of the crack and the failure criterion. The publication explains the way of working of this algorithm. The described calculations show that computer analysis gives unrealistic results in terms of the destructive force. SEN-beam is an interesting laboratory test in which a lot of factors influence the results. It is especially important to study what phenomena occur in the final phase of the study, when the crack tip is near the opposite side.
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