SIMULIA Ressourcen-Center

This paper describes the behavior and subsequent constitutive modelling of a Hytrel thermoplastic elastomer (TPC-ET) for a so-called Jounce bumper, which is a part of the vehicle’s shock absorber system. This component is subjected to large deformations (up to 100% strain) with significant permanent set and loss of stiffness. The objective of the analysis is to predict the component behavior after cyclic loading to obtain the load-displacement response curve of the Jounce bumper in operational conditions. The possibilities and limitations of the hyper-elastic model, including permanent-set and Mullins’ effect are discussed and numerical results compared to the test data from an actual component.

Customer Papers

The SIMULIA Living Heart Human Model provides a unique testing environment where a pacemaker lead can be virtually inserted and mechanically deformed during the cardiac cycle. Once the mechanical deformation results are obtained, the long-term durability of the implant can be assessed. The virtual nature of the test provides a physiologically accurate methodology to test new and existing devices without exposing patients to un-necessary risk.

Tech Notes

The SIMULIA Living Heart Human Model provides a unique testing environment where a stent can be deployed virtually in coronary arteries and deformed mechanically during the cardiac cycle. Once the mechanical deformation results are obtained, the long-term durability of the stent can be assessed. The virtual nature of the test provides a physiologically accurate methodology to test new and existing devices without exposing patients to unnecessary risk.

Tech Notes

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White Papers

Using this model, natural fracture opening and shear slippage are investigated depending on horizontal stress contrast, adjoining fissure conductivity, and hydraulic-natural fracture intersection angle. Modeling results demonstrate the complexities of hydraulic fracture growth through the intersection with natural fracture such as selective branching and throttling at the intersection. Our fracturing simulation results agree with the analytical criteria for fracture crossing or arrest at the intersection.

Customer Papers

Excessive heat generation and retention in ultra-large dump truck tires is among the most common causes of tire failures in the surface mining industry. Accurate prediction of an operating tire temperature profile involves the use of advanced numerical models and solution schemes to mimic the complete elastomeric materials response to operating conditions. The internally generated heat in a tire is a function of its viscoelastic energy dissipation during rolling. Previous research studies have inaccurately predicted off-the-road (OTR) tire heat generation rates and temperatures by the use of linear viscoelasticity to approximate the rather nonlinear viscoelastic rubber material. This paper presents an accurate approach to predicting OTR tire temperature distributions taking into account the true mechanical response of the filled rubber compounds used in tires.

Customer Papers

Subsidence modeling is an important activity in the oil and gas industry, for the environmental and operational implications associated to this phenomenon. Abaqus/Standard has been used for many years in Eni as the main numerical simulator for studying the geomechanical behavior of reservoirs. The results of a large campaign of acquisition of subsidence monitoring data in conjunction with the advanced analysis of laboratory experiments have shown that, in some cases, an improved mechanical characterization can be tailored to better capture the complex behavior of the reservoir rock under the effect of underground fluid withdrawal.

Customer Papers

Material degradation and dynamic loadings are the main reasons for the damage in metals. Material degradation was caused by crack initiation and fatigue or dynamic loadings are the source for crack growth. The precise and realistic modeling of inelastic behavior of metals is crucial for solving several problems in engineering fields. To predict the initiation and growth of damage, there are several failure models & theories available presently. In this paper, progressive damage and failure material model using explicit finite element techniques are applied to predict the failure of aluminum alloy.

Customer Papers

The coupled Eulerian-Lagrangian (CEL) method in Abaqus/Explicit is essential in component design of head protection systems at BMW Group as it allows an accurate modeling of the gas behavior. However, due to the nature of the algorithm, the modeling of the contact between inflator gas and airbag membrane is a challenging task. Using conventional modeling techniques, two airbag membrane sections are not able to separate again, as soon as they come into contact, as the membrane elements are embedded into Eulerian cells entirely filled with inflator gas. The proposed modeling approach overcomes this severe contact issue and allows separation of the membranes after having been in contact. The method has successfully been applied for airbag deployment simulations within the development process at BMW Group.

Customer Papers

In the vehicle design, the interaction between road and vehicle is the main criteria in order to meet the durability, NVH (Noise Vibration and Harshness) & handling performance. Potholes in the road can cause damage to the wheel, suspension and chassis components. Pothole size and vehicle speed were the main factors for the damage. The larger pothole can cause severe damage or alignment issues. Based on the severity of the impact, damage will happen to the wheel rim and there will be a reduction in the air pressure inside the tire. In long-term, it will damage the suspension or steering components and it can also lead to premature tire wear and poor handling of the vehicle.

Customer Papers

Thermoplastic polymers show significant nonlinear viscoelastic behavior due to which, after removing the applied load, these materials have some viscoelastic recovery over time before permanent deformation or set occurs. In this work, Abaqus PRF model is used to predict this time dependent viscoelastic recovery. Unlike linear viscoelastic model in Abaqus, PRF model can predict the typical nonlinear viscoelastic behavior of thermoplastic materials. Two types of testing, stress relaxation and cyclic loading at three different strain levels, are used to calibrate the coefficients of PRF model. SIMULIA’s optimization tool Isight is used to optimize these coefficients. Using the optimized coefficients, the PRF model is able to predict the time dependent nonlinear viscoelastic recovery of thermoplastic polymers.

Customer Papers

This paper builds on previous undergraduate research done on the analysis of a baseball bunt. In that situation the bat was held stationary, while the ball was launched at a given velocity. In this research, the bat is allowed to swing with the swinging motion controlled by the user. The end result is a determination of the optimal position to hit a ball during a bat swing on an approaching ball as well as the optimal swing pattern. The ball’s exit velocity and direction is obtained after the impact with the bat. The results will not only show the direction the ball will travel, but how far it will travel as well.

Customer Papers

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