SIMULIA 리소스 센터

The paper present results obtained using Abaqus/Explicit software for predicting the impact damage and failure response of various aircraft structures under high velocity impact loadings. Two types of problems are considered. The first concern the crash simulation of a generic airplane fuselage section and the second concern study of bird strike on typical wing leading edge using both metallic and composite structure. In the case of an aircraft fuselage hitting the ground, both vertical crash test and steep glide slope crash conditions are considered. The main objective was then to develop a methodology for performing such fast transient dynamic simulation tests and to determine in each case the residual velocity as well the various deformation modes associated with particular loading and crash conditions.

Customer Papers

Each year companies spend millions of dollars for developing new products with high quality and reliability. Highly reliable products require longer test times to verify, and usually takes a few iteration of design-test-fix cycle. Development time can be minimized by (1) doing accelerated testing (ALT) and (2) reducing the design-test-fix cycle by developing methods to predict and test for reliability in simulation environment. Finite element modeling and analysis provides an excellent alternative in evaluating designs to improve on reliability. In this paper, a probabilistic simulation methodology is proposed using a combination of simulation modeling and statistical techniques to predict and improve the drop reliability of a product under repeated random loading.

Customer Papers

Dynamic excitation due to a pipe break can cause pipe to abruptly displace and hit the components, instrumentation and equipment nearby. In order to minimize the extensive damage caused by such pipe whips, different types of restraints and supports are designed for the pipelines. Here, structural dynamic behaviour of pipelines is studied with finite element method. A relatively short pipe line section with one bend and one restraint and rigidly fixed from its other end is chosen as a test case. The usability of different types of elements provided by Abaqus code in modelling the pipe, restraint and adjacent civil structure is tested.

Customer Papers

Over the past couple of decades, standard test methods and material models have existed for rubber-like materials. These materials were classified under the category of Hyperelastic materials. Well established physical test methods and computational procedures exist for the characterization of the material behavior in tension, compression, shear volumetric response, tear strength etc. In this paper, we make an attempt to demonstrate the use of such standard test methods and the applicability of such test data for performing finite element analyses of complex nonlinear problems using Abaqus. Our goal is to demonstrate the effective use of standard physical test data to model multi-axial loading situations and fracture of hyperelastic materials through tear tests and indentation test simulations.

Customer Papers

A simulation is needed to investigate the heat generation on a rubber section of a wheel which is running at a constant speed. In parallel with this loading case a rig test was carried out to verify the finite element analysis. For analysis point of view a traditional way is to use the Lagrangian approach in which the mesh is used to discretize the structure (both materials and mesh are spatially fixed) and many revolutions are typically required to obtain the state of interest to the analyst, this approach is prohibitively expensive and cumbersome. Abaqus provides an approach based on the Eulerian theory in which the finite element mesh of the wheel does not rotate, instead the materials flow through the mesh.

Customer Papers

Nonlinear analysis using Riks method is suitable for predicting buckling, post-buckling, or collapse of certain types of structures, materials, or loading conditions, where linear or eigenvalue method will become inadequate or incapable, especially when nonlinear material, such as plasticity, is present, or post-buckling behavior is of interest. These structures usually undergo finite deformations due to complicated loadings or material plasticity before buckling actually occurs, which changes system matrices, and thus, makes the eigenvalue analysis inaccurate, difficult, or even impossible to perform. This study intends to demonstrate the use of Riks method in the nonlinear analysis of buckling and post-buckling behaviors of a flexible structure under bending and compressive loads.

Customer Papers

Transient dynamic simulations gain importance in the automotive industry and modern fatigue postprocessors are apt to evaluate the fatigue damage. However, additional insight into a structure’s behaviour may be obtained from observing the displacements. Displacement patterns are important for design engineers in order to improve the structure. With proportional static loads it is trivial to display and understand the displacements, but the displacements in dynamic simulations are often very complicated. This paper describes a novel method for visualising the transient displacements of mode-based analyses. Based on the modal displacements a new simple, yet fatigue equivalent, modal displacement is computed and visualized instead.

Customer Papers

Hybrid III dummies are among the most frequently used dummies in both industry and academia for vehicle crash safety. Abaqus is one of most widely applied finite element codes in the world. To meet the needs of crash safety analysis and to exploit the potential of the Abaqus/Explicit code, a family of HIII dummies, including HII 50th male, 5th female and 95th male dummies, were developed at FTSS in collaboration with Simulia and BMW. This paper describes in detail the development of the HIII dummies with specific reference to the HIII 50th dummy.

Customer Papers

The ability to accurately model welding processes in order to predict residual stresses and distortions is becoming increasingly important in the engineering industry. Abaqus can be used to model the welding process but this has been found to be considerably time consuming and requires a large number of assumptions to be made. Virtual Fabrication Technology is an analysis software suite that is designed to allow Abaqus to accurately model complex welding procedures. It was developed by the Battelle Memorial Institute in conjunction with Caterpillar Incorporated in the USA. The software is centred on a Graphical User Interface that is used to assign welding paths, parameters and material properties to FE models that have been imported from Abaqus/CAE.

Customer Papers

For inclusion of inertia effects of moving fluid columns or strings into structural mechanics simulations, a combined finite-element modelling scheme is proposed in ABAQUS. The concept has been realized in the form of user subroutines (UEL) of beam type. These can be coupled to existing standard (e.g., Euler-Bernoulli or Timoshenko) elements . The proposed Coriolis elements can be applied for, e.g., prediction of loads from high-speed flows and phase shifts of oscillating fluid-conveying pipe systems with arbitrary complex designs. The modelling scheme also allows a flexible coupling to shell or solid finite-element models.

Customer Papers

The objective of this work was to minimize the mass of a mechanism for locking aircraft landing gear doors whilst ensuring stresses did not exceed the material allowable stress. A typical metallic locking mechanism comprises a frame attached to the aircraft structure and supporting a number of linkages through pivot pins. These linkages transfer translational motion of a hydraulic actuator into rotation of a hook, which engages with the door. The structure was modelled with Abaqus/Standard as a non-linear static analysis involving contact, but with no material or geometric non-linearity.

Customer Papers