Centro de recursos de SIMULIA

The immense reciprocating energy transfer in a connecting rod leads to durability concerns in an automotive engine design. The resulting cyclical compressive and tensile stresses derive from the dynamics initiated by the mass inertial forces, the combustion compressive forces, and the resulting reaction forces. Three vital components to this analysis are the effective pressure in the cylinder, crankshaft dynamics and the connecting rod dynamics. Using validated data of effective combustion pressure and the corresponding crankshaft dynamics, the connecting rod load dynamics were obtained. These loads are robustly interacting with the connecting rod through the contact of journals and bearings.

Customer Papers

: In end milling, cutting forces and residual stresses need to be precisely predicted in order to improve the quality of the workpiece. Numerical simulation has however not been very successful using the Lagrangian formulation in Finite Element Analysis. This is partly because there is no satisfactory and accurate separation criterion used in the modelling procedure. The results are found to be highly sensitive to the separation criterion used. End milling process simulation by the use of the Finite Element Method was investigated in this paper with an Arbitrary Lagrangian Formulation (ALE).

Customer Papers

The fire resistance of steel framed multi story buildings and their ability to withstand exposure to fully developed fire conditions without the need for all structural members to be protected with insulating material (passive fire protection) has received significant attention in recent years. This has been based around determining patterns of partial passive fire protection in accordance with sound fire engineering procedures that will ensure satisfactory performance in severe fires. A suitable procedure is the Slab Panel Method (SPM), which has been developed from a programme of small and large scale experimental testing under both Standard Fire and natural fire conditions, in conjunction with implicit and quasi-static explicit simulations.

Customer Papers

This paper presents the finite element modelling of a conical stockpile using Abaqus. The effect of construction history was realized by simulating the progressive formation of the conical pile. This was achieved by discretising the final geometry of the stockpile into multiple conical layers and then activating each layer sequentially. The effects of the elastic and plastic parameters were explored. The results show that a pressure dip may or may not be predicted depending on the constitutive model and the values for the model parameters. The study also shows that modelling the conical pile in one single step does not produce the pressure dip. It further shows that the central pressure dip is predicted using a relatively small number of layers and the magnitude of the dip is not sensitive to increasing number of layers, which is in contrast with one previous study.

Customer Papers

In this study we compare various way of quantifying high cycle radial fatigue behavior in a percutaneous Mitral repair device using Goodman methods. In order to provide an improved representation of the tissue-device interaction, we use an Ogden hyperelastic model to simulate the native vessel with parameters obtained from pressure-diameter test data of human cadaver heart coronary tissue, and published data presented in previous work. We also examine how the computed peak tensile strains at the surface of this device differ from the values computed at integration points in the 3D and the same integration point values extrapolated to the nodal points and averaged over adjacent elements.

Customer Papers

In the UK, conventional fossil fired plant is operated flexibly, some has now operated in excess of 5,000 starts and there has been an increase in the occurrence of crack initiation and propagation in a variety of components and from a variety of features. Rotor geometries are relatively easily meshed by sweeping, this paper extends the method to use a C3D10 tetrahedral global model applicable to conventional power generation plant. Tetrahedral mesh is controlled using the external face mesh with little control of the ‘internal’ mesh. In this paper the solid is partitioned to ensure a fine and even mesh around the crack tip and at the driven nodes.

Customer Papers

This paper presents a methodology for analyzing well deformation under the thaw subsidence loading. The well evaluation methodology includes several analysis programs in sequence, such as wellbore hydraulic and heat transfer analysis, to determine the heat input to the permafrost interval due to the production of hydrocarbons; geothermal analysis, to estimate the extent of the permafrost thaw; geomechanical and soil deformation analysis, to calculate the thaw-induced soil stress and movement; and casing-formation interaction analysis, to evaluate the impact of thaw subsidence on the potential deformations and mechanical and hydraulic integrity of well casing systems. The presented methodology is recommended for optimizing well completion designs to minimize the well failure potentials.

Customer Papers

The Army is developing new grenades with sensors instead of explosives. A grid of 40- mm grenades will be fired from conventional M16 rifles. The projectiles must survive gun launch and impact. After impact, soldiers will get a real-time ‘picture’ of a local area. Signals from the onboard sensors will be processed on a hand-held computer that captures the activity within the grenade web.

Customer Papers

Hydroplaning is a dynamic phenomenon the tire undergoes while rolling on a wet road, when water penetrates under footprint, causing a progressive reduction of the contact patch at increasing rolling speed, thus affecting car/passengers safety. In this paper Abaqus application is shown to different tread pattern geometries with the aim to assess FEA model robustness; more specifically, effects of speed and pattern geometry have been investigated. Simple laminar fluid cases (from literature) have been also simulated for sake of basic assessment of the CEL methodology.

Customer Papers

For high strength carbon fiber reinforced polymers, the design criteria are often specified by the compression strength of the composite materials component. This is due to the fact that the compression strength of unidirectional composites is as low as 50 to 60 percent of the tensile strength. One important compressive failure mode in composite is kink-band formation which for a great deal is governed by the waviness of the fibers and the yielding properties of the matrix material. Therefore, in order to make proper simulation of the failure modes in composites, it is necessary to take these effects into account. One approach is to model the actual fiber/matrix system using a micromechanical based finite element model.

Customer Papers

Numerical methods applicable to the tibia bone and soft tissue biomechanics of an ACL reconstructed knee are presented in this paper. The aim is to achieve a better understanding of the mechanics of an ACL reconstructed knee. The paper describes the methodology applied in the development of an anatomically detailed three-dimensional ACL reconstructed knee model for finite element analysis from medical image data obtained from a CT scan. Density segmentation techniques are used to geometrically define the knee bone structure and the encapsulated soft tissues configuration. Linear and non-linear elastic constitutive material models are implemented to mechanically characterize the behaviour of the biological materials. Preliminary numerical results for the model qualitative evaluation are presented.

Customer Papers