Centre de ressources SIMULIA

When performing material testing usually global measurements are used for the calculation of material strains. Especially, when high strain rates of more than 100 1/s are examined those data are often unreliable. Within this paper the recently at EDAG introduced optical measuring system is presented and the identification of material parameters is explained. The comparison of experimental and numerical component test data of an automotive door trim demonstrates the advantages of such a system.

Customer Papers

Due to concerns over particle generation in conventional metal-on-polyethylene hip bearings used in total hip arthroplasty, interest in advanced low-wear bearing alternatives such as ceramic-on-ceramic couples has reemerged. While ceramics demonstrate excellent compressive strength, the brittle nature of the material reduces tensile strength, possibly leading to catastrophic fracture when loads exceed material limits. Impingement between the femoral neck and acetabular liner gives rise to areas of extreme transient stress concentration, which have been clinically linked to fracture. This work presents methodology for the investigation of 3D ceramic fracture initiation/propagation using Abaqus’ co-simulation and extended finite element modeling capability.

Customer Papers

Computational modeling of stents can provide insight into critical locations (high stress/strain regions), help with design iterations/optimization, and reduce the need for bench-top testing. This study focuses on the developmental efforts to create a material model that can capture the mechanical response of poly-L-lactide, the backbone of Abbott Vascular’s ABSORB Bioresorbable Vascular Scaffold.

Customer Papers

The state of the current automotive or heavy duty industries is changing rapidly, especially with the recent recession still in mind or to some extend still looming. In such an environment the competitiveness of a company is tested on every step. Engineering-based companies have to re-define their strategies, what means engineering to them.

Customer Papers

An irradiated graphite material UMAT subroutine models the through life behaviour of the core components, but the whole core structure is so large with many interactions that an ABAQUS model would normally put excessive demands on computational resources. However this difficulty has been overcome by making use of superelements and parallel programming.

Customer Papers

A person specific drop foot brace was simulated in the commercial finite element code Abaqus.The geometry was imported from a 3D optical scan of the actual surface and modeled as a composite material layup defined in a local discrete material coordinate system. The finite element model was used in order to model the stance phase in a normal walking. The material choice is a challenging task giving flexibility to the brace together with sufficiently stiffness and fatigue strength. The simulation has been compared with measurements from a strain gauge mounted foot brace tested in use. Based on simulations, a large number of expensive trial and error iterations can be avoided. Simulations show a strong geometry interaction with the loading of the material.

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

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

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

During the exploitation of a reservoir the displacements occurring in the near wellbore areas may induce mechanical actions on the well completions, including the steel casing and the cemented annulus, bringing to instability and failure of the well structure, with strong impacts on the economics of the field. The evaluation of the well completion integrity in the long-term is therefore a critical issue in the design phase.

Customer Papers

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

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