SIMULIA Ressourcen-Center

An FE study of the behaviour of concrete blocks compressed against rubber sheets was conducted. The results were compared to experimental tests of the same assembly reported in the literature. It was found that tensile stresses developed within the concrete due to non-uniform compression of the rubber and were likely to have been the cause of failure of the concrete except where the rubber sheet was very thin or absent. The effect disappeared if contact between the rubber and concrete was frictionless.

Customer Papers

In this paper, two issues are addressed. First, for given material (fixed Young’s modulus), what is the transition point (D/t) for plastic (yield strength) collapse to elastic collapse? How does the transition point change with the yield strength? A pipe with a thin section of length L is supported by thicker sections at both ends. It is known that the thin section with a large D/t, the shorter the L, the higher the collapse pressure. The question is how short (L/D) must the pipe be to prevent elastic collapse, or in other words, for a given D/t, what is the transition point (L/D)? The transition curves obtained provide useful guidelines for tubular product design and testing when collapse is a concern.

Customer Papers

The shot peen forming is a cold work deformation process consisting of treating the surface of a work piece with a stream of round shots (usually made of steel) with high enough energy to deform plastically the surface. This plastic deformation causes compressive residual stresses under the surface that are able to create a curvature on the component. This process is increasingly being used to create smooth curvatures in large pieces, for example, in the manufacturing of aerodynamic panels in the aeronautic sector.

Customer Papers

The radiation noise simulation of a rolling tire is presented. Here we consider only radiation noise caused by structural vibration excited by tread pattern. The simulation consists of three parts, i.e. quasi-static rolling simulation using a tire model having tread pattern, frequency response analysis of a rolling tire model having longitudinal grooves and acoustic simulation surrounding the second tire model. Each part is conducted sequentially using Abaqus/Standard.

Customer Papers

XFEM, Extended Finite Element Method, can accurately predict fracture failure. The Army would like to use XFEM in many areas to prevent fracture failures as part of the design process. Problems of interest include drop tests, concrete penetration, gun launch, recoil, and interaction of gun supports with ground. These problems have loads that are dynamic and multi-directional. The geometry often requires millions of degrees of freedom for accuracy. Explicit codes are generally used to capture the complicated system response as a function of time.

Customer Papers

Abaqus has been used for many years in eni as the main stress/strain simulator for studying the geomechanical behaviour of reservoirs both at field and well scale. In the work presented in this paper, the new capabilities developed in Abaqus/CAE are applied with reference to a field scale geomechanical study performed on a realistic test case. As shown in the example application, the capabilities developed in Abaqus/CAE are particularly suitable for reservoir geomechanical simulations, and allow one to perform accurate analyses that overcome the limitations of the previous workflow and simultaneously provide significant automation.

Customer Papers

This paper describes the development of knitted fabric models for finite element analysis to simulate the large deformation behavior of garments and their clothing pressure distribution on the human body. In this study, for the modeling of cloth materials, two analytical approaches are investigated: a rebar layer model combined with isotropic hyperelastic shell elements and an anisotropic hyperelastic material model with a polyconvex strain energy function defined by the UMAT user-subroutine.

Customer Papers

As the maximum speed of bullet trains continues to increase, overheating and thermal deformation/stress on brake systems are going to be critical for emergency stops. Precise prediction of the maximum temperature is needed for the design of brake systems, especially for both discs and linings, where how to handle the high speed spinning of discs is the point of the heat/structure coupled analyses. Abaqus provides couple of potential methods but each one had critical shortcomings. The authors investigated the feasibility of a new method; Abaqus/Explicit using ‘rigid bodies with temperature degrees of freedom’ for fully coupled thermal analysis. Temperature of both discs and linings was successfully analyzed over the whole time span of an emergency braking event with practical computation time.

Customer Papers

In this paper, three kinds of nonlinear static analyses and three kinds of dynamic analyses were carried out on a thin shell structure which showed obvious buckling in experiments. While no buckling deformation mode was observed in any of the static analyses, the buckling deformation mode observed in the experiment was precisely simulated throughout the buckling event without any geometric imperfection in all the dynamic analyses. In addition, the critical stroke and reaction force of the buckling in the dynamic analyses were in good agreement with the experimental results. Parametric analyses results will be presented and discussed.

Customer Papers

Expandable sand screens are a sand control system which is used to control the ingress of solids, in oil and gas reservoirs in weak and unconsolidated formations. The filtration media is typically sized to the largest 10% of the formation grain size distribution. As a consequence of this some fine solids are often produced. This has a beneficial effect in that it cleans the near wellbore of fine solids which have a tendency to plug the formations. However, in high rate gas wells there may be the possibility of erosion on the inside of the filter media part of the ESS in the transition area between expanded and non-expanded sections of the screen. To reduce the chances of this happening, the addition of thin sacrificial plates were installed over the critical area.

Customer Papers

In this paper the interface between Abaqus and OpenFOAM is described in the context of a case study of a thermal stress analysis of a coolant tank. The generated interface extracts the pressure, wall temperature and convection coefficient distribution from the OpenFOAM analysis and maps the mechanical and thermal loads over the structural ABAQUS FE-model. This interface allows the engineering team to carry out the thermal stress structural development with an accurate thermal and mechanical load prediction based on CFD analysis without compromising the development cost.

Customer Papers

A numerical procedure for optimization of a coronary stent geometry using three dimensional analysis techniques is presented. The objective of the optimization analyses is to maximize the long term durability (fatigue-safety), while keeping acute structural safety (plastic strains) below a given threshold. The expanded and crimped radial stiffness, as well as diametrical expansion recoil output quantities of each optimization simulation are also monitored. The software used during the optimization process consists of HEEDS, an optimization software package developed by Red Cedar Technology, coupled to Abaqus/Explicit.

Customer Papers