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A detailed Finite Element Analysis (FEA) was carried out to evaluate the seal and the initial conclusion was that it required complete re-design. In this work, analysis and interpretation was used to establish the modelling method for the seal. The FEA model that was developed for seal optimisation contained elasto-plastic material response, frictional contact modelling, advanced pressure field application and thermal modelling. To maintain sealing contact pressure, the seal has to overcome differential radial movement between the vessel and the end cap during pressure loading. The optimisation process developed a novel profiled seal contact that reduced contact stresses by 48%, eliminating seat damage occurring during pressure loadings.

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The importance of the rule of simulation at a conceptual design stage is pointed out recently. The methodology using multi-objective design optimization and data mining, which is called MODE (Multi-Objective Design Exploration), is helpful to find out design knowledge. In this study, we show that the design knowledge found by MODE is fruitful for decision making at a conceptual design stage of real world example i.e. contour design of a fuel efficient tire. Our procedure of MODE consists of nonlinear FEA to predict tire performance, evolutional computation to get desirable solutions including Pareto solution, and data mining to find out design knowledge. SOM (Self-Organizing Map) and decision tree are used to obtain appropriate design variables and their threshold.

Customer Papers

At times, oil and gas wells require workover operations to repair or replace corroded downhole equipment. During these maintenance operations, a single hole may be required to allow kill fluids to be circulated to maintain well control. Traditionally, the hole would be made via explosives and mechanical hole-punching methods, which frequently fail to perforate. To improve these operations, slickline-deployed electro-mechanical downhole power unit perforating tools were developed by a major oilfield engineering company and successfully applied in the field for perforating 41⁄2-in. size, J-55 grade steel tubing.

Customer Papers

Advanced composite materials are being used in an increasing number of gas turbine engine products where their unique combination of properties such as low density, high strength and fatigue resistance help to increase performance. High temperature composites are currently being investigated in many components of gas turbines where load and high temperature capability are critical. Development of efficient, accurate modeling methodologies is critical. This presentation focuses on two methods to create a plylevel finite element model using the integrated Dassault Systèmes (DS) product suite. This includes CATIA Composites Part Design, Composites Link, and Composites Modeler for Abaqus and Abaqus.

Customer Papers

In tube hydroforming process, the load path which is the relation between axial feed and internal pressure plays a major role in deciding the quality of hydro formed components. This study demonstrates how to arrive at optimal load path curve to achieve maximum bulge height keeping thickness reduction within limit and ensuring that the component does not get tear off during the manufacturing process. The hydroforming process is simulated using explicit dynamic procedure in structural simulation application. The DOE process is defined using simulation process modeling, to identify optimum load path. 3DEXPERIENCE platform works as an effective integration and automation platform for such studies.

Customer Papers

Accurately simulating the blast wave associated with an accidental explosion is extremely valuable in assessing the structural response and potential failure modes of critical process equipment such as storage tanks, piping, or pressure vessels in chemical and petrochemical facilities. Furthermore, assessing the potential damage from a blast wave can provide valuable information about protecting structures from external explosions and developing designs that improve blast damage mitigation. This paper discusses the underlying theory and examines the practical application of multiple finite element based explicit computational techniques for simulating the load acting on a structure due to a chemical explosion.

Customer Papers

Advanced non-linear and vulnerability analyses are used today to support all phases of Airbus aircraft structures, especially the design and certification phases, by providing an understanding and an ever better prediction level of structural behavior. On the A350XWB program, numerical predictions have become key to ensuring a risk free major static test campaign. In the coming years, with the increased number of flying aircraft, the use of numerical capabilities will also grow to help resolve or prevent potential in-service issues. This paper presents an overview of selected ADVANS achievements reached so far and perspectives of the future.

Customer Papers

Real life mechanical failures can be predominantly attributed to three factors: uncertainty in magnitude and character of loads, insufficient consideration to in-service behavior of material, unreasonable assumptions in design. FEA Simulation can provide valuable inputs to avoid risk of failures. Realistic material modeling has an important role in this regards. In Practical engineering analysis, modeling material damage through degradation of Elastic modulus is one of the effective techniques. Using relevant amongst several theories, constitutive equations and empirical formulations characterizing this phenomenon, creates a plausibly realistic FE Model. However these models are approximate, not generically applicable and are not mathematically well posed.

Customer Papers

The Coupling-Eulerian-Lagrange (CEL) method used in Abaqus/Explicit allows fluids to interact with solid structure. Interdisciplinary studies in FEM, combined with CFD simulation, have a great performance in the automotive industry - for cockpit and airbag development, especially in the early stage of the airbag deployment. The CEL methods help to get a more realistic airbag unfolding, by injecting inflator gas into the airbag chambers. Compared with the common Abaqus Uniform-Pressure-Method (UPM), the CEL method delivers a more precise airbag deployment. This is necessary for an easier interpretation of load levels, outgoing from the inflator gas pressure on surrounding components, like the headliner or the airbag-cover.

Customer Papers

Periodic boundary conditions (PBC) are a set of boundary conditions that can be used to simulate a large system (i.e. bulk material) simply by modeling a finite Representive Volume Element (RVE). PBC has been favored among many researchers and practicing engineers in the study of various materials. Unfortunately it remains vague on how PBC should be applied properly in FEA packages such as Abaqus. In this article, we explicitly show the detailed procedures one could easily follow to define PBC in Abaqus through a simple example which is given in the forms of input file. A robust Matlab script which can be used to pair a large number of randomly distributed nodes on two opposite surfaces of a 3D RVE is also supplied to facilitate easy application of PBC.

Customer Papers

In this study we aim to assess the performance of Abaqus/CFD in modeling hemodynamics using the FDA Benchmark Nozzle model. The Nozzle model consists of a tube with a straight section, followed by a conical section, a section with reduced tube diameter and a section with a sudden expansion in tube diameter. The device was designed to include accelerating flow, decelerating flow, variations in shear stress and velocities, and recirculating flow, all of which may be present in a medical device and relate to blood damage. In this study we have used pure hex mesh as well as the steady state solver introduced recently to solve both laminar and turbulent flow problems and compared the results with published experimental data.

Customer Papers

During the qualification of a manufacturing technique, radiographic inspection revealed porosity in and around a weld. It was hypothesised that the cause of this porosity was associated with a previous manufacturing hot rolling procedure rather than an issue associated with the welding technique itself. The analysis demonstrated a mechanistic root cause of the initial porosity found during the radiography and this was substantiated by good correlation with a number of controlled manufacturing experiments. The sensitivity analysis helped to identify the key parameters to control during the hot rolling procedure. Further to this, the assessment improved the understanding of the procedure and helped to identify improvements for Non-Destructive Examination (NDE) by bounding the potential extent of the concern

Customer Papers