SIMULIA 리소스 센터

Friction stir welding is used to fabricate the NASA Ares I rocket upper stage fuel tank. The friction stir plug weld fills the hole left when the stir weld tool is removed. NASA engineers want to examine fracture conditions in the plug weld due to possible imperfections to assure safety and reliability. An automated and parametric crack mesh generator is needed to quickly and easily examine numerous cases. The plug weld crack meshing approach and its reliance on Abaqus for analysis is discussed, and crack mesh basics are reviewed. The choice of crack shape and 39 additional geometric and mesh control parameters, such as the plug diameter, transverse weld sizes, and plug bevel angle affect how the crack mesh is created.

Customer Papers

In the production of aerospace engine components, metal cutting processes are characterized by a strong demand for increased productivity that does not compromise the high quality of the product. In aerospace machining applications on hard-cut materials like: nickel based alloys, titanium alloys, etc, it is fundamental to keep under control the local cutting zone phenomena in order to assure the final product quality. The machining process design development can be summarized by the following steps: definition and verification of the Part Program (PP) through dedicated CAD–CAM software applications, post processing of the produced PP, CNC machine simulation and physical tryout.

Customer Papers

Under contract from Wright-Patterson AFB (WPAFB), ATA Engineering, Inc., (ATA) has performed a study of “snap-through buckling” of a panel on a hypersonic vehicle under the influence of fluctuating pressures. Snap-through occurs when the elastic stiffness of the structure is cancelled by the effects of compressive stress within the structure. If this effect causes the structure to suddenly displace a large amount in a direction normal to the load direction then it is classical bifurcation buckling. If there is a sudden large movement in the direction of the loading it is snap-through buckling.

Customer Papers

Currently, the typical Isight user is a specialist in process integration, optimization and creation of complex processes. He can create complex processes with different external programmes quickly and has a good knowledge of data structure, interfaces and useful control scripts. If some problems appear, the expert user with his experience can react and solve the problem very quickly. By contrast, non-expert users need much more time to build or customise the same complex processes and to solve occurring problems. Therefore, there is a clear barrier for non-expert users to work on complex processes with Isight.

Customer Papers

Suspension rubber bushingsin full vehicle models are usually represented with nonlinear spring elements. However, when bushings are preloaded or deformed in diagonal direction, the spring element models tend to express inaccurate movement. In this paper, suspension rubber bushings are modeled with solid finite elements. We established a technique enabling to evaluate the nonlinear large deformation behavior ofrubber bushings. This modeling technique is also able to improve simulation accuracy compared to the conventional modeling technique.

Customer Papers

This paper shows how multiple analysis techniques converge in Abaqus/Standard to produce simulation-driven design of restrained PVC pipe joints. PVC is known to exhibit viscoelastic behavior as it approaches its glassy transition temperature. This is used to produce pipe sockets by heating and forming them over a mandrel. A type of pipe joint which is becoming very successful includes other elements such as special seals made or rubber and steel, and restraint mechanisms made of ductile iron, which remain trapped inside the socket when it cools. At room temperature, elastic-plastic behavior of PVC dominates. As the restraint mechanism grips a spigot inserted in the socket, the pipe is indented by sharp teeth, causing severe plastic strain and mesh distortion. This makes a good case for an Adaptive Langragian-Eulerian domain.

Customer Papers

This paper describes the use of an Isight-based system called intelligent Decision Advisor (iDA) in the composite layer lay-up optimization problem. iDA is a frontend interface developed to use Isight’s powerful explorative methods to achieve established design objectives. In this study, iDA is used to manage several hundreds of variables, and to improve the shape and positions, the orientation and the thickness of the composite plies and stack sequence of an existing wing pylon design of AleniaAermacchi. This process directly drives the design toward an immediate manufacturability with optimized stiffness, weight and cost. Finally the implications regarding the management of the whole simulation process, its multi-disciplinary aspects and its advantages to the company will be discussed.

Customer Papers

Empowering lean teams to deliver on ambitious time-to-market schedules

White Papers

Reliability of portable devices becomes a serious issue as complexity of the devices grows and miniaturization trend continues. In case of dynamic applications durability against impact on hard surfaces is a standard requirement for mobile electronic devices, verified in drop tests. Computer Aided Engineering (CAE) methods and tools are used as means to accelerate the overall design cycle and to reduce time to market. In case of drop test simulations it is an important task to assess quality of simulation models and effect of different input parameters on results. This paper describes first results of a research project on development of an automated procedure of sensitivity analysis and robustness evaluation of product level simulation models used for drop test simulation.

Customer Papers

Developing the ability to predict density distribution, monotonic plasticity, damage and the cyclic damage progression is imperative for the design of Powder Metallurgy (PM) components that will experience overloads during in-service life due to impacts, rough ground, and crash environments. In this paper, mathematical-based models for PM manufacturing process are developed, validated and implemented in user material subroutines VUMAT and UMAT to model the compaction and sintering processes.

Customer Papers

Seahorses (belonging to the genus Hippocampus) and pipehorses are unique among fishes in being armed with robust body plates instead of scales, and in being able to bend their tail ventrally for use as a prehensile appendage. They lack a powerful caudal fin, making them very slow swimmers, which can hardly escape predatory fish. However, they have survived millions of years of natural selection, yielding a very well camouflaged fish with a highly specialized caudal skeleton.

Customer Papers

Snow traction is an important tire performance parameter for product applications in markets where snow is present for several months during the year. It is very difficult to perform multiple tests because proving grounds and consistent test conditions are available only for limited periods of time and due to prototyping and test expense. This paper deals with the simulation aspects of the snow traction test using Abaqus.

Customer Papers