SIMULIA Ressourcen-Center

To replace missing teeth with dental implants is a common and clinically proven treatment option. However, there are still several complications with this kind of treatment. Besides biological complications like periimplantitis, the most common technical complication is loosening or fracture of the screw which is mainly due to fatigue. The purpose of this investigation is to appraise a ranking of the fatigue behavior of six different implant systems by finite element method (FEM) simulations in order to figure out the "worst case" implant system for the fatigue testing according to ISO standard 14801. The simulations were conducted according to the guidance of the US Food and Drug Association (FDA) "Reporting of Computational Modeling Studies in Medical Device Submissions".

Customer Papers

The SIMULIA Living Heart Human Model (LHHM) is a platform to study various heart diseases and to evaluate the effectiveness of various devices. While previous studies have shown that LHHM‐based simulations can be used for early‐stage effectiveness assessments of devices, such as an annuloplasty ring, more thorough assessments and optimization of device function require a more rigorous framework. In this study, we focus on such a framework for Mitral Valve (MV) function. This study demonstrates that the Living Heart Human Model can be used as a platform to better understand cardiac functioning of healthy hearts, which then allows the potential to introduce disease states, and to simulate effectiveness of potential treatment options in increasingly rigorous manners.

Customer Papers

In daily practice, the identification of the mechanical pathogenesis of foot diseases mostly relies on observation, patient history, clinical assessment, medical imaging, and in rare cases on gait analysis. Based on the results of this plethora of tests, orthopaedic surgeons use a variety of treatments with respect to clinical guidelines to restore and maintain proper bony alignment and muscle balance. Despite improvement of clinical and radiographic parameters, a growing body of evidence finds that one-type-surgery-suits-all approach does not ensure a restoration of function. Inter-subject anatomical heterogeneity, the complexity of the foot and the inability to assess the internal foot loading conditions preclude one-type-surgery-suits-all approach.

Customer Papers

As additive manufacturing (AM) evolves to become a more viable production solution in terms of cost, quality, and time, the need for predictive simulation of the process grows as well. After testing several commercial offerings to see how well they could predict deformation of various parts, Abaqus was found to be the most promising option and chosen for a more in depth analysis. The scope of this particular project was to examine the effects of certain simulation choices – from basics (mesh, time stepping, element type) to unique AM convergence techniques (full/partial activation, expansion time constant, follow deformation, etc.). Hundreds of simulations were run in Abaqus with various permutations and the resulting response on the final deformation and stress state was tracked.

Customer Papers

Prestressed concrete crossties have become an important component of the railroad track structure as loading demands have been increasing. However, several premature failure patterns of concrete crossties, including the splitting/bursting failure, are of concern to the railroad community owing to their adverse effect on track integrity and safety. Previous studies demonstrated that small-scale pretensioned concrete prisms had excellent correlations with concrete ties in the bond performance, and similar prisms are being used to establish the splitting/bursting performance of concrete ties. This parametric study focuses on characterizing the splitting/bursting damage of prestressed concrete prisms during the de-tensioning process with respect to the design parameters of the prisms and the concrete release strengths.

Customer Papers

Mold Cooling channel design directly impacts the cooling efficiency, temperature uniformity, and cycle time, and is also one of the key factors which influences the overall quality of injection molded plastic products. In this paper, we describe a project involving the mold cooling design optimization for the Impeller of a HVAC blower unit. Conventional cooling channel design is compared and contrasted with a conformal cooling channel design. Conventional cooling channels have straight-line channels which can easily be drilled. However, with increasing complexity of plastic part designs, these conventional channels are too inefficient and can result in long cycle times or worse inferior part quality by increasing part warpage.

Customer Papers

Generally, an automatic transmission is composed of various components in a complicated manner, and each component is subjected to various loads. Among them, the planetary gear, which is an essential component of the automatic transmission, has a particularly complicated structure. Simple models are often used for endurance analysis to evaluate specific parts of a gear set, because it takes a lot of time and resources to construct a system analysis model and perform FEM analysis. However, this approach is sometimes inconsistent with actual phenomena due to excessive boundary conditions and simplified loading conditions. This study compares the process and results between the simplification model for the 'carrier' part of the planetary gear set and the system model including the gear set.

Customer Papers

In the hyper-competitive environment of the automotive industry, engineers are constantly looking for ways to improve the quality, durability and performances of their engines. Traditional shape optimization is a great solution for design improvements in later product development stages by minimizing stress or strain. Indeed, stress reduction often leads to a significant increase in durability, but stress peaks, as identified by static analysis, may differ largely from areas of maximum damage. Therefore, fatigue life simulation should always be included in the optimization loop, if the location of maximum damage and maximum stress are not matching.

Customer Papers

This paper showcases the applications of Abaqus/Explicit to the R&D of flexible plastic packaging films and products that Bemis Company is currently engaging to, particularly in the areas of liquid pouch packaging and thermoforming of medical device packages. The pouch burst strength was analyzed using the shell element with fluid cavity technique and it was found that the material ductility affected the pouch failure modes or locations. The pouch liquid filling and drop impact performance was modeled with the smoothed particle hydrodynamics (SPH) method, which revealed that upon impact from a drop height of 4 to 5 feet the deformation rate in the pouch was on the level of or over a hundred per second.

Customer Papers

Transcranial Electrical Stimulation (tES) is a noninvasive neuromodulation technique wherein low intensity electrical current is applied to the head via scalp-mounted electrodes. Transcranial Direct Current Stimulation (tDCS, a form of tES) is increasingly being used in the treatment of several neurological and psychiatric disorders such as stroke recovery, depression, and schizophrenia. However, tDCS-induced electrical current patterns in the brain show marked inter-individual variation due to underlying differences in brain morphology and choice of treatment protocol. It is therefore difficult to predict the clinical outcome of tDCS treatment in a particular subject.

Customer Papers

For a cost and time efficient virtual development process three main objectives can be identified: Minimize the turnaround time, maximize the throughput, and minimize license and hardware costs. Beside the fact, that these are contrary objectives, optimizing the model to reduce the runtime helps for every objective.

Customer Papers

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