Centro de recursos de SIMULIA

For clinicians and medical device manufacturers, in-vitro and in-vivo testing of the knee are important methods for evaluating treatment techniques. However, numerical models that can provide much of the same information will become of more service and are a new focus of the modeling community. A continued effort has centered on specimen-specific anatomical and functional models, in terms of both geometry and mechanical properties of the tissue constituents. Here, a specimen-specific model of the knee is presented that includes the femur, tibia, and four main ligaments. Solid models based on CT and MR scans of a human knee joint were meshed in Patran and assembled for solving in Abaqus 6.7-1.

Customer Papers

The deviatoric response of the Marlow model in Abaqusis defined by test data from a single mode of deformation. For example, the model can be defined with uniaxial tension data or uniaxial compression data but not with both (except in very limited cases involving 1-D elements). The fact that the Marlow model depends only on the first strain invariant causes the limitation. This paper shows that the Marlow model in Abaqus is a special case of a hyperelastic potential function which involves the first and second strain invariants. The extended Marlow model is defined by uniaxial tension and equibiaxial tension data.

Customer Papers

Oblique elastic impact of spheres and the related case for cylinders have been studied cases for many years in simulations of systems with loose supports, such as heat exchanger tubesupport interaction, as well as granular flows and robotic task modeling. The problem is a relative simple one in the class of transient frictional contact problems in that the stresses away from the contact zone are typically neglected. The available continuum model solutions from literature show some very interesting features. For near normal angles of incidence, these solutions combine a Hertzian contact stress solution in the normal direction with a partial-slip shear stress distribution in the tangential direction, in which a central portion of the contact zone is sticking while the coincident points of the outer annulus slide relative to one another.

Customer Papers

High precision reduction gears are composed of many cranks and gears which are in high stress contact through bearings. In order to precisely evaluate stresses in critical components, an attempt was made to analyze a complete model of a high precision reduction gear taking into account the contact conditions between the parts. Using the latest contact analysis function of ABAQUS 6.6, a 650,000 element model with 190 contact surfaces was successfully analyzed in under 24 hours. The results revealed the exact stress distribution in each part based on the local deformation of the components. This achievement could be a breakthrough for rational design and satisfy the growing demand for higher durability under higher load within limited space.

Customer Papers

Demands for state-of-the-art product developments are stronger than ever. Nowadays all industries are subject to accelerating changes in production and development and increasing aggressive competition. Complex demands can be fulfilled by applying simulation (ABAQUS) and optimization technologies (TOSCA) in an early phase of the virtual product development process. Product cycles have to become shorter by an increasing product complexity. This paper will describe the usage of automatic structural optimization methods within an early design phase of the development process for modern combustion engines used by FEV.

Customer Papers

Embossing of polymeric films destined for usage in the personal care marketplace is an industrial process that produces a very fine pattern, barely discernible to the naked eye, yet has a significant influence on some market-driven properties; more bulk, a soft and smooth touch, reduced crinkling noise and lower gloss. However this comes at a cost to the mechanical properties such as stiffness and ultimate strength capability. The paper discusses the computational approach, presents results of simulations performed in Abaqus/Explicit for an example 16 micron film and compares to experimentally measured values.

Customer Papers

There is increasing interest in the use of organic matrix composite materials in aerospace, as it is commonly stated that composite materials show good fatigue properties. This is rather difficult to quantify. Fatigue testing to obtain a S/N curve or a Range-Mean diagram for a composite material is fraught with difficulties; test specimens are prone to significant manufacture variation and it is time consuming to get data for high fatigue life. It is recognized that microcracks exist in composite components that would normally be considered “undamaged”. It has also been found that such cracks show evidence of crack growth during fatigue testing, although such growth is tiny in the length scale of the component.

Customer Papers

Thermal technologies are widely used for the heavy oil recovery. The thermal processes usually consist of some variation of Cyclic Steam Stimulation (CSS), steam flood or Steam Assisted Gravity Drainage (SAGD). These thermal recovery applications have experienced numerous well casing failures around the world, often resulting in loss of wellbore integrity, lost production and added costs. The primary casing failure mechanisms include casing connection leakage and/or parting due to excessive casing strain and wellbore serviceability difficulties due to large casing deformation associated with casing buckling and shear.

Customer Papers

Mine scale finite element simulations are now a key design and planning tool for some of the world’s largest and most challenging open pit and deep underground mining projects. Models with more than ten million degrees of freedom are regularly used for forecasting and probabilistic analysis of Life-of-Mine scenarios. These simulations, sometimes analysing decades of the extraction and continuing deformation of complex infrastructure, are run in less than a day on the Abaqus/Explicit parallel solver using 32 CPUs. The speed and benefits of high-similitude analysis has allowed Abaqus simulation to become more commonplace, and in some cases to be considered a requirement for sufficient analysis of high-value mine developments.

Customer Papers

This paper describes a study of a BMW front seat model in low speed rear crash configuration using a finite element (FE) BioRID-II dummy developed by Simulia. The dummy was a preproduction version 1.9, without officially proved correlation of moments and rotations by FAT. In order to validate this FE model, hardware low speed tests have been performed. Furthermore an overview concerning the influence of the friction between dummy and seat, the influence of backset and the importance of the dummy position is presented.

Customer Papers

The automotive and heavy-duty industry (off- and on-highway) requirements for emission, noise and fuel reduction and control have become more stringent. Based on the complexity of the system with its involved components and operating environment a new approach needed to be developed to meet the new demands. Today it is almost given that CAE plays the central role in engineering development, not only does it offer the potential for shorter development cycles and reduced costs but it also offers the potential to optimise complex systems and demonstrate component and system limitations.

Customer Papers

Considered by the automotive industry as a good solution to bond car body parts together, structural adhesives must be integrated in the early design process of vehicles, hence in the finite element analysis. A first difficulty when modeling structural adhesives comes from their complex mechanical pressure-dependent behaviour as well as their load-dependent strength. These aspects make them impossible to describe by classical material constitutive models such as von Mises or exponent Drucker-Prager, in the general case.

Customer Papers