SIMULIA Ressourcen-Center

This paper is concerned with optimization of the design of a turbine blade curved fir-tree root and rim by integrating a knowledge of computer aided optimization (CAO) and finite element analysis (FEA). The optimization software Isight and FEA software Abaqus are applied in an effort to optimize the shape of the curved fir-tree root of a given turbine blade. Several critical geometrical features such as the radius of root centerline, (x, y) coordinate of center point of the centerline, and distances from blade center to leading and trailing edge of the platform, are taken as design variables and the maximum equivalent stress of root and rim as objective function.

Customer Papers

Product development engineers often use simulation to evaluate the performance of a single design - a part or a system - characterized by a specific CAD representation, specific input data, and materials properties. This paper is focused on CAD and CAE workflow integration for the design of a Gas Turbine vane. The model of the complete process, implemented in the SEE-Fiper environment and involving all the calculation tools, is described.

Customer Papers

The design phase for offshore rigid pipelines can be lengthy and demanding. A significant number of engineering hours can be burned before the various analyses attain target results. The assessment of the lateral buckling phenomenon is one aspect of the pipeline design that requires numerous finite element simulations. The purpose of such simulations is to determine if the pipeline has a genuine tendency for lateral buckling and, if so, whether control of the buckling behavior is required to ensure that the pipeline stresses and strains are within allowable limits.

Customer Papers

In order to secure the A350 structural test campaign, the Virtual Full Scale Test project (ViFST) was launched to predict more accurately the behaviour of the aircraft, especially to better handle nonlinear effects (large displacements, plasticity, contact ...). The project covers most of the aircraft structure and brings together teams from 5 countries (Germany, England, Spain, India and France). The presentation will focus on the central model, which is composed of the central fuselage and the two wings. This is the largest model of the project (68 millions of variables). The presentation will detail the particular challenges overcome by Airbus and Simulia teams.

Customer Papers

The French CEA, together with EDF and the IAEA, recently organised an international benchmark to evaluate the ability to model the mechanical behaviour of a typical nuclear reinforced concrete structure subjected to seismic demands. The paper presents the conclusions of the pre-test exercise, as well as some observations from additional simulations conducted after the experimental results were made available.

Customer Papers

Containers (bottles) made of polymers are exposed to manifold loads during their life cycle. They are open or sealed as well as empty or filled. Depending on the mentioned conditions a container behaves different under loading. This effect can be observed in everyday life. Imagine opening a shaken plastic bottle filled with a carbonated beverage. Abaqus provides simulation methods for completely filled containers with either a pneumatic or a hydraulic fluid. Real containers barely are totally filled with a hydraulic fluid. In general there is always a so called head space filled with gas (pneumatic fluid). This paper presents two methods for modelling the two-phase system (liquid and gas) inside a partly filled container using a fluid cavity instead of meshing the volume inside the container.

Customer Papers

The main topic of the paper is to show the validation of the Coupled EulerianLagrangian (CEL) analysis technique applied to Newtonian fluid dynamics simulations described by an equation of state (EOS) suggested by Mie-Grüneisen. The model is driven only by body forces through cavity filling. This implementation allows to obtain free surfaces profile, splash droplet formation, velocity field, instantaneous pressure at the contact points between solid and fluid, as well as in solid parts, stresses and strains, all at the same time. The free surface validation obtained in the fluid is made through comparisons with radiographs obtained experimentally.

Customer Papers

The present paper shows the development of an efficient, fast and reliable optimizer for composite and metallic parts of lightweight structures. The algorithm aims at identifying the optimal configuration of different structural parts concerning thickness, fibre orientation, number of plies, etc. This leads to mass savings and also a decrease of the development time in the structural dimensioning phase. Due to the limited applicability of classical optimization algorithms like gradient based or evolutionary methods in case of large Finite Element models with a high number of design variables, a novel approach is presented where the optimization problem is tackled by a heuristic adaption procedure on element level.

Customer Papers

Higher Efficiency by Optimization - Integrating Simulation-based Structural Optimization into the Product Development Process

White Papers

A method development program of testing and simulations was carried out to develop bird impact NLFEA capabilities of composite sandwich damage prediction and bird dispersion after penetration of the primary layer using Abaqus Explicit. Curved composite honeycomb panels (referred to as J-Nose) representing typical composite wing Fixed Leading Edge (FLE) structure were subjected to bird strike to generate data for method validation. The test campaign was tailored to produce various levels of damage and modes of failure; from minor localized core/skin damage to panel perforation. In all tests high speed video were installed to capture the behavior of the structure during the impact.

Customer Papers

The developed procedures show how to consider the anisotropic mechanical behavior of injection molded short-fiber-reinforced plastics parts in FE analysis. It is shown how the existing information, which is provided by injection molding simulation software, can be processed and transferred into mechanical simulation models. The procedure is outlined with practical applications.

Customer Papers

Among the numerous advantages of CFRP laminated structures there are some drawbacks, such as the high sensitivity in terms of impact loading. Particularly low-velocity impacts result in non-visible and barely-visible impact damage respectively. The threedimensional state of stress in the impact zone leads to matrix cracking and delamination inside the composite laminate and possibly to fibre failure for higher impact energies. It can be very difficult to detect such damage by visual inspection, and additionally, in most cases a significant reduction of strength and stiffness can be expected. To improve the damage tolerance a rubber layer, named KRAIBON , is integrated in the composite layup of cylindrical carbon/epoxy tubular specimens.

Customer Papers

Together with our sister brand GEOVIA, we will be hosting a series...

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This article was originally published in the December 2017 issue of SIMULIA Community...

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