SIMULIA リソース・センター

The Vernay VernaFlo flow controls are custom-designed fluid flow management devices used in a wide range of applications and systems where consistent, reliable operation is essential. Elastomeric rubber components in these devices deform under the influence of upstream variations in fluid pressure. These deformations adjust the orifice diameter and help maintain a constant downstream flow rate. In this Technology Brief the performance of a custom VernaFlo device is evaluated using the fully coupled fluid-structure interaction solution provided by the Abaqus co-simulation capability. The effects of cavitation on the flow are considered. The computational results compare favorably to available experimental data.

Solution Briefs

In this Technology Brief, a co-simulation approach using Abaqus and Dymola is used to achieve a realistic systemlevel simulation of an ABS. The tire, wheel, brake caliper mechanism, and road are simulated with a detailed Abaqus finite element model while the brake system control algorithm and hydraulics and are simulated with Dymola.

Solution Briefs

Abaqus/Explicit offers a sophisticated coupled EulerianLagrangian (CEL) technique that can be used to simulate dynamic gas flow in the airbag. The flow-based CEL method offers a more realistic prediction of airbag shape and pressure distribution during all stages of deployment.

Solution Briefs

This technology brief illustrates typical mode-based noise, vibration, and harshness (NVH) analyses of a full automobile model using the Abaqus product suite. Abaqus/AMS, the automatic multi-level substructuring eigensolver, is used to compute the eigensolution. A steady-state dynamic analysis is then performed in Abaqus/Standard. The significant performance benefit of using Abaqus/AMS and the SIMbased linear dynamics architecture will be demonstrated for uncoupled structural and coupled structural-acoustic analyses.

Solution Briefs

Stadler Rail, an emerging European railway manufacturer, has been using ABAQUS for the structural evaluation of car body shells and bogie frames since 2003. The finite element models derived for quasi-static analyses of the primary load carrying structures can be directly used for explicit analyses of the crashworthiness behavior. Standards like EN15227 or the FRA waiver regulations in the RSAC ETF I report of FRA prescribe special collision scenarios for which the survival zone of the passengers and the engineer have to be proven. Comparisons between explicit analysis results and dynamic testing have shown that the crash behavior of the structures has been successfully captured.

Customer Papers

The Biofidelic Rear Impact Dummy (BioRID-II) hardware model has been developed to measure automotive seat and head restraint system performance in low-speed rear end crashes. It has also been used to further the understanding of whiplash injuries. This technology brief focuses on the Abaqus BioRID-II finite element model, which has been developed in cooperation with the German Association for Research in Automobile Technology FAT. The capabilities of the model will be described, and a comparison with experimental data is shown.

Solution Briefs

A wide range of loading conditions must be considered in the design of a tire. Computational simulations of a quasistatic, steady-state dynamic and nonlinear transient dynamic nature must be completed. In addition, the complexity and size of typical tire models highlight the need for efficient solution techniques.

Solution Briefs

Abaqus/CAE includes modeling and postprocessing capabilities for fracture mechanics analyses. These features provide interactive access to the contour integral fracture mechanics technology in Abaqus/Standard. Several fracture-specific tools are available, such as those for creating seam cracks, defining singularities, selecting the crack front and crack tip, defining q-vectors or normals to the crack front, and creating focused meshes. With these tools models can be created to estimate J-integrals, stress intensity factors, and crack propagation directions. In this technology brief a standardized compact tension specimen is modeled, and J-integral results are compared with those generated from applicable American Society for Testing and Materials (ASTM) standards and from a laboratory testing method. It is shown that Abaqus results are in very close conformance with the experimental results.

Solution Briefs

Linear-elastic fracture mechanics on the basis of advanced tools in FEM calculation (XFEM, contour integral) enable rapid and realistic evaluation of the fracture growth. This results in new possibilities, for example, for the derivation of testing intervals (damage tolerance analysis, contour integral) and for the carrying out of damage analyses. Using an industrial example, procedures and results of the Abaqus-supported determination of stress intensity factors will be explained. Considerations for the calculation of the fracture course with a dominant strain-induced load will be discussed.

Customer Papers

Maximizing gain while minimizing the possibility of feedback requires an optimal choice of design parameters. In this Technology Brief, we outline how Abaqus/Standard and Isight can be combined in a process to optimize the vibro-acoustic characteristics of hearing instruments.

Solution Briefs

Construction of earthen dams entails sequential placement and compaction of soil layers and the subsequent fill -up of the embanked reservoir. In the design of earthen dams, two potentially critical events must be considered: the rapid emptying (or drawdown) of the reservoir and the dynamic loading of an earthquake. The possibility of dam failure in these situations depends on the respective build -up and dissipation of the fluid pore pressure in the soil.

Solution Briefs

Assessing the strength of soil slopes and investigating the means for increasing their safety against failure are crucial in construction projects involving large soil masses. Slope stability analyses have traditionally been performed using a limit state approach. However, any presence of reinforcement or local heterogeneity necessitates the use of numerical techniques such as finite element analysis. Abaqus/Standard can be used for modeling reinforced soils and can thus help geotechnical engineers in determining optimal reinforcement sizes and placement configurations. Abaqus/Explicit can be used for modeling the failure as well as the movement of dislodged soil masses.

Solution Briefs