SIMULIA 리소스 센터

A UMATHT user subroutine was developed in Abaqus to combine a non-isothermal dual crystallization kinetics model with a statistical melting model in order to describe the simultaneous solidification/re-melting behavior of 3D printed parts during the Extrusion Deposition (ED) process. This subroutine is described in detail. Results indicate that crystallization behavior is significant and strongly dependent on the utilized polymer. As an outlook, the interaction with a second UMAT user subroutine that will be employed to predict residual stresses and deformations is explained.

Customer Papers

Lattice structures bear many desirable characteristics from design standpoints, such as stable designs with large network of structural members, desirable weight characteristics, custom mechanical behavior and porous nature that could facilitate bone and tissue growth on medical implants. To efficiently optimize the structure of lattices, we can use Tosca structure to vary the lattices thickness to reach certain design objectives. However, the radii in Tosca are associated with beams which are not optimal to have a smooth stress transition on connected nodes.

Customer Papers

In order to support challenging requirements for space science missions, NASA and its industry partners are turning to deployable thin-film structures. A good example is the sunshield for the James Webb Space Telescope (JWST). The sunshield provides the necessary screening from external light and heat sources required to ensure proper functioning of the telescope. It is comprised of multiple layers of very thin (0.001-0.002 inch) Kapton film and has a deployed planform area roughly equivalent to a tennis court. In order to fit within the launch vehicle payload envelope of course this large-area structure must be stowed in a folded configuration then deployed to full plan-form once on orbit.

Customer Papers

The second half of the twentieth century has ushered in new advancements in the field of architectural and civil engineering. One such material that is increasing being put to novel uses in building structures is architectural glass. Even though glass has been used in building facades since a very long time, the complexity of modern structures demands use of powerful design and analysis tools to achieve the desired goals. The current paper discusses one such application of insulated glass in a serpentine all-glass wall at the base of a building in Dallas, TX. The challenge in designing the glass to the required standards of safety come from the fact that each piece of glass is different and is warped to achieve an organic contour.

Customer Papers

This report synthesizes the results of a Finite Element Analysis (FEA) modeling the Asiana Airlines Flight 214 crash, at San Francisco International Airport (SFO). The goal was to reproduce the movement of the aircraft and to validate how truthfully the method of FEA could represent the real crash dynamically. At first, only rigid elements were used to represent the model with the purpose of using the maximum number of rigid elements in order to save processing time. Secondly, a combination of rigid and deformable elements were used, in order to find the weak spots during impact. Thirdly, cohesive elements were introduced at the weak spots, located at the turbine, tail and wheels, in order to model part separation during impact.

Customer Papers

The objective of this study was to investigate the use of composite as an alternative in the aircraft wing and thus help to reduce the weight of the plane. In general, the composite material is used in the aviation industry to reduce the overall weight as much as possible in order to improve aircraft maneuver performance, decrease aircraft manufacturing and operational costs while keeping the stress levels under a certain value (static or fatigue allowable). The wing structure is design in CATIA V5, and the skin of wing is applied with CATIA composite design. Then the model is exported to Abaqus to calculate, simulate and optimize.

Customer Papers

This paper will illustrate a SIMULIA SEE process involving Abaqus/Explicit in order to perform an automatic complex sequence of virtual drop test on the packaging of gas hobs. The virtual drop process is intended to be used by the designers without specific knowledge of the explicit dynamic simulations and it involves automatic mesh of the packaging CAD geometries. The Isight virtual drop process enables the design of innovative packaging, it supports the introduction of new materials in the packaging technologies reducing the time to market within the usual try&fix of the physical testing. The process has been designed flexible enough to address the meaningful library of the gas hob product line shapes and material. Some numerical versus physical test validation will be shown.

Customer Papers

Lattice structures bear many desirable characteristics from design standpoints, such as stable designs with large network of structural members, desirable weight characteristics, custom mechanical behavior and porous nature that could facilitate bone and tissue growth on medical implants. To efficiently optimize the structure of lattices, we can use Tosca structure to vary the lattices thickness to reach certain design objectives. However, the radii in Tosca are associated with beams which are not optimal to have a smooth stress transition on connected nodes.

Customer Papers

Components within missile systems are vulnerable to performance degradation as a result of heat and vibrations generated by neighboring components. Conventional methods to alleviate this degradation include installing passive vibration-damping materials, adding material to shift resonance frequencies and adding heat sinks to removed unwanted heat. All of these approaches add parasitic weight to the system. Topology optimization methods are well established analysis tools that are used to determine an optimal material distribution of a design space, subject to a performance constraint, for a given set of loads and boundary conditions; making them ideal for tailoring the thermal and frequency response of missile components and associated structures without adding parasitic weight.

Customer Papers

In the development of any new high explosive ammunition, often, the most intricate and problematic component is the fuzing system. Primary purpose of the fuze is to function with the bursting charge in a munition at a specified time and place. The fuze must include a Safety and Arming Device (SAD or S&A mechanism) to ensure that the ammunition may only switch into the armed state following exposure to firing forces and after reaching a safe distance from the muzzle. S&A mechanisms are often mechanical and operate using clockwork escapement mechanisms, similar to those found in wrist watches but in a less sophisticated manner.

Customer Papers

This paper is related to using Finite Element Analysis to analyze the motion of a hockey stick hitting a puck. The end result is a determination of the optimal position to hit the puck during the stick swing on the stationary puck as well as the optimal swing pattern. The puck’s exit velocity and direction is obtained after the impact with the stick. The results will not only show the direction the ball will travel, but how far it will travel as well. The stresses on the hockey stick are also determined for each impact. For simulation purposes the puck was designed to have material properties similar to that of the official puck used in National Hockey League. The stick was also designed to have two rigid grips, to mimic two hands.

Customer Papers

Plane Wave Normal Incidence Model Construction

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안녕하세요 다쏘시스템코리아 SIMULIA 브랜드팀입니다.​​이번 포스팅은 ALE adaptive meshing을 활용한 Self-piercing riveting 해석을 소개해 드리겠습니다.​Abaqus의 adaptive meshing 기술은 Lagrangian

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