Papers by Keyword: Finite Element (FE) Simulation

Abstract: Two structural schemes of the Hong Kong-Zhuhai-Macau Immersed Tunnel were compared. In Scheme 1, the prestressed reinforcing bars were to be cut off after installation. And in Scheme 2, the prestressed reinforcing bars will be kept there as they were after installation. A finite element model for sections E12~E15 was built by using the finite element software PLAXIS with consideration to the construction process and different loading conditions to analyze both schemes. The calculation results show that they both meet the design requirements.

Abstract: The seismic performance of RC frame beam-column joints was analyzed by using ANSYS in the paper. Firstly, reasonable finite element models were established by comparing the result of numerical simulation to experiment. Thus the seismic performance of concrete frame joints strengthened by Sprayed FRP was studied, and influence on the seismic performance by different thickness, length of Sprayed FRP, and different axial pressure ratio of column were analyzed in the paper too. Studies showed that reinforcing the concrete frame joints with Sprayed FRP is effective.

Abstract: There are many uncertainty factors which can influence the carrier pile design and construction, some of them can lead the deformation characteristic of carrier pile more complex, especially the carrier pile shape parameter. Based on the on-site testing results and the finite element simulation conclusion, the paper studied the effects of shape parameter on deformation characteristics of the carrier pile from the aspect of bottom head size, pile diameter size, gravel soil zone size, etc. The research found that increase the size of the bottom head and the size gravel soil zone can reduce the amount of deformation to a certain extent; the effect of pile diameter size increase on reducing the deformation is not obvious.

Abstract: The technical and economic feasibility of high strength low alloy structural steel is analyzed used in highway semi-rigid guardrail. In principle of improving safety performance and reducing cost, a kind of high strength low alloy structural steel guardrail is designed. Through the finite element simulation method, the safety performance of this guardrail structure is validated to satisfy the grade-A conditions (160kJ kinetic energy). Compared with the guardrail of same protection level made of ordinary carbon structural steel, high strength low alloy structural steel guardrail can reduce the probability of penetrating when the accident vehicle impact the guardrail and decrease the accident damage, the steel consumption is above 20% lower and the construction cost can be saved as well, thus, remarkable economic and social benefits can be obtained.

Abstract: Based on a modified form of Archard’s wear theory, significant data were obtained using the finite element analysis code DEFORM during the process of warm extrusion, including instantaneous interface temperature, sliding velocity, and interface pressure distribution of every node. From the acquired data, the wear of the punch, the temperature–wear coefficient curve, temperature–wear depth curve, and temperature–hardness curve were acquired. The results show that the maximum wear occurred in the front working tape of the punch. The results are in agreement with actual conditions, and therefore, lay a foundation for forecasting die life and optimizing die cavity profiles using this method.

Abstract: Springback is a main problem in sheet metal rubber bladder forming that influences the geometric accuracy of a part. In this paper, springback distribution of a certain aircraft part is analyzed by finite element simulation and verified the accuracy of relevant equations. The aircraft part is divided into six convex flanging areas for analysis, several technological parameters are taken into consider, and the results of simulation and equation calculation are well agreed, the influence of a joggle is also discussed.

Abstract: Plane-strain tension and shear tests were carried out for a fully annealed AA1050 sheet. The tests were simulated numerically with a commercial finite element method (FEM) code using an anisotropic plasticity model including the Yld2004-18p yield function, the associated flow rule and isotropic hardening. The advanced yield function was calibrated by three different methods: using uniaxial tension data combined with FC-Taylor model predictions of the equibiaxial yield stress and r-value, using 201 virtual yield points in stress space, and using a combination of experimental data and virtual yield points (i.e., a hybrid method). The virtual stress points at yielding were provided by the recently proposed Alamel model with the so-called Type III relaxation (Alamel Type III model). FEM simulations of the tests were then made with parameters of Yld2004-18p identified by these three methods. Predicted force-displacement curves were compared to the experimental data, and the accuracy of the parameter identification methods for Yld2004-18p was evaluated based on these comparisons.

Abstract: Commonly used visualisation methods for observing material flow during extrusion are either labor intensive, prone to loss of the tracer pattern or subject to different flow behaviour than occurs in practice. A novel visualisation method using a copper mesh inlay and computer tomography was developed and used to visualise the flow behaviour of partially extruded EN AW-6082 aluminum billets. In parallel with the physical experiments, a finite element (FE) model was developed and compared with the experiments. The material flow was readily observable from the computer tomography images and the FE model data closely matched the experimental results.

Abstract: The inchworm-driven actuator is an important type of piezo-driven actuators, which has high loading capacity, large motion range and high motion accuracy but involves complex structures, control and motion processes. In this paper, an inchworm type piezo-driven rotary actuator was introduced. Static and modal analyses of key units of the rotary actuator such as the clamping unit and the driving unit were carried out by finite element simulations to ensure that key units of the rotary actuator have enough strength and good dynamic characteristics. These simulation results will be helpful to improve structure design of the inchworm actuator.

Abstract: Splitting spinning is a special spinning processing method which is different from the common spinning and powerful spinning. According to the forming step can be divided into splitting process and shaping process. It analyzed splitting spinning process of deformation behavior by the elastic plastic finite element method of 2024 aluminum alloy, it determined the largest area of deformation and stress concentration region in the deformation process of the deformation, at the same time, it proposed the adaptive grid technique in splitting spinning simulation process, and selected quality amplification factor carefully.