SIMULIA リソース・センター

A finite element model is developed to investigate the instantaneous as well as long-term (time-dependant) structural response of a pre-loaded torsional spring. Torsional springs belong to a class of spiral springs that are commonly made out of Elgiloy - an alloy of Cobalt, Chromium, Nickel and Iron. Elgiloy has very high yield strength, and is commonly used as a spring material in clocks. The research involves development of a detailed component-level model, using Abaqus/Standard, to investigate the instantaneous static moment-rotation response, and the longterm stress relaxation response of the spring system, along with, understanding the sensitivity of this response on the various design parameters.

Customer Papers

ABAQUS/Explicit, combining with general contact, connector elements, distributedmemory processing (DMP), and digital signal processing (DSP) techniques, has a unique strength in solving some of the large quasi-static problems which involve large number of sliding contact pairs, highly nonlinear structural behavior. In this paper, a case is presented to show the successful application of ABAQUS/Explicit to solve the real-world problem in multi-ply girder truss load distribution testing. The model predicted ply-to-ply load transfer rates agree well with the test results. The calibrated model can be used for taking the place of some expensive lab tests, and it can be also used for evaluation of many design variations more efficiently.

Customer Papers

Many engine components in large medium-speed diesel engines are subject to cyclic loading. In many cases constant amplitude loading in the high-cycle range is assumed, hence it is customary to design for an infinite lifetime. Many engine components have a complex geometry, and that is why, particularly in locations of stress concentrations, a multiaxial stress state will prevail. It will be of utmost importance, already in the design stage, to make a rigorous fatigue damage evaluation on the results from the finite element analysis. For this purpose an in-house post-processing program has been written in the C++ programming language.

Customer Papers

The fatigue life of power train components can be improved dramatically by finding crack initiation points with suitable software tools and optimization of the critical areas. With increasing capacities of computers the prediction of the fatigue life for components by numerical methods gets more and more important. The modern virtual development process is able to include many physical effects to enable realistic analyses. The presentation deals with an application on a piston of the software ABAQUS and the Sehitoglu’s TMF method to access the thermo mechanical fatigue life due to transient temperature distributions.

Customer Papers

One of the many powerful capabilities of Abaqus is its ability to easily model a structure embedded inside of a host structure. This technique has been used to analyze an RFID chip and helical antenna embedded in a rubber patch for use in tire applications. The main objective of the analysis of the chip/antenna/patch assembly was to determine the stress concentration in the antenna caused by its interaction with the relatively rigid chip. In the course of conducting this analysis, a high degree of sensitivity was observed in the interaction between the embedded helical antenna and the host rubber patch. This paper will show how adequate refinement of the host structure becomes crucial if accurate results are to be obtained with the embedded element technique.

Customer Papers

The development of technical polymers in recent years has led to a rapidly increasing number of industrial applications utilising these materials. Not only does the use of polymeric materials as an alternative to metals reduce weight, it also allows for highly complex designs to be realised in terms of both size and functionality. In fact, numerous contemporary product designs would either not be feasible or financially justifiable without the use of polymeric materials. The automotive industry has successfully been using polymers for over twenty years as a means of reducing cost and weight.

Customer Papers

This paper is about a new methodology in which a system level structural analysis of a suspension system has been integrated in the mechanical development environment. The mechanical characteristics of the suspension are taken into account by the multibody model whereas the structural characteristics of the different members are taken into account by the corresponding structural models. In order to solve the system level model a non-linear finite element solver, such as Abaqus, has been used. This integrated development environment has been verified and tuned during the 8C Competizione project, the Alfa Romeo’s high-class sport car. Hereafter this innovative methodology is presented.

Customer Papers

New standards like prEN15227 and the TSI Highspeed prescribe the validation process for the crashworthiness of railway vehicles. Stadler Rail has introduced ABAQUS as explicit solver to simulate the design collision scenarios required: train against identical train at a closing speed of 36 km/h, train against 80-ton-freight wagon at a closing speed of 36 km/h, and train against a large deformable obstacle (representing a truck) at a closing speed of 110 km/h. The large deformable obstacle is defined in the standard by prescribing a load-deflection curve for the collision of a rigid sphere of a three-meter diameter against the obstacle. Suitable material laws in ABAQUS have enabled to achieve the required stiffness behavior for the deformable obstacle.

Customer Papers

Genetic algorithms have become one of successful tools in design and topology optimization. The optimization module based on genetic algorithms was developed and employed in Abaqus/CAE by GUI and kernel scripting. The new module extends advanced functionality of Abaqus/CAE allowing to perform optimization directly in Abaqus Unified FEA product suite from SIMULIA. Significant improvement in evolving into optimal solution can be achieved when genetic algorithms are combined with neural networks which one can train by running Abaqus jobs, and substantially improve the efficiency of computations. In the paper the shape optimization problem of a tooth implant will be presented and discussed in detail.

Customer Papers

This paper presents a computational framework that employs elastic-plastic-failure finite element analysis (FEA) tools to predict dynamic forces, deformations and puncture resistance of railroad tank car heads in impact events. First, computational sensitivity to analysis code, analysis type, element type, element size, through-the-thickness characteristics and element integration scheme is studied for elastic-plastic analyses. Second, the progressive damage and failure modeling for ductile metals is employed to estimate the puncture resistance of a tank car head.

Customer Papers

Due to the limitation of computer capacity and the soften of the material constitution, the nonlinear dynamic earthquake analyses of skyscrapers are not practical in engineer’s desktop, and even in the research area they are still open problems. Utilizing ABAQUS’s unique combination of implicit and explicit technologies and capable of solving large problem efficiently, the author solves the problem elegantly and practically. In the analysis model, all members and shear-walls are modeled by plastic zone model, and large deflection effects are taking into account.

Customer Papers

Notwithstanding the increasing demand for polymeric materials in an extraordinary variety of applications, the engineers have often only limited tools suitable for the design of parts made of polymers, both in terms of mathematical models and reliable material data, which together constitute the basis for a finite-elements based design. In order to predict the polymer creep behaviour, this paper proposes a solution based on artificial neural networks, where the experimental creep curves are used to determine the parameters of a neural network which is then simply implemented in an Abaqus user subroutine.

Customer Papers