SIMULIA Ressourcen-Center

During finite element analysis (FEA) of downhole tools, the fluid load acting on the tool chassis and completion system, such as hydrostatic pressure, reservoir pressure, or applied wellbore pressure, is simply represented by uniform static pressure. This approximation of fluid load has been shown to be effective and accurate enough for many applications and is widely accepted. However, this fluid load representation can be problematic in terms of trapped fluid because the pressure from trapped fluid, which is typically confined between seals in a closed or confined volume, changes with deformation or deflection caused by applied pressure or by axial tensile or compressive loads on surrounding structures.

Customer Papers

Simulations contain assumptions and uncertainties that a designer must evaluate to obtain a measure of accuracy. The assumptions of the product design can be differentiated from the ones for the solver and material model through the use of a mid-stage validation. An open loop validation uses a controlled test on a standardized part to compare results from a simulation to the physical experiment. From the validation, confidence in the material model and solver is gained. In this study, the material properties of a polypropylene are tested to characterize for an *ELASTIC *PLASTIC model in ABAQUS. A validation of a quasi-static three-point bending experiment of a parallel ribbed plate is then performed and simulated. A comparison of the strain fields resulting from the complex stress state on the face of the ribs obtained by digital image correlation (DIC) vs. simulation is used to quantify the simulation's fidelity.

Customer Papers

This paper showcases the capabilities of Abaqus explicit solver to simulate and solve problems involving huge plastic deformation due to caulking process. Caulking is a mechanical joining process achieved by plastically deforming a material in order to hold another material. This method is in research phase and being examined by engineers at Daimler and University of Erlangen-Nuremberg (Germany). This technique is mainly used in Permanent Magnet motors to hold the magnets in the rotor stacks. The objective of the simulation is to find optimum tool geometry, depth of tool penetration and location of penetration for caulking process. The process involves huge plastic deformation and is successfully simulated using Abaqus Explicit. This illustrates the effectiveness of numerical simulations, helping the designers in reducing the need for actual test bench with numerous high cost fabricated hardware setup and thereby saving huge R &D cost and time.

Customer Papers

The critical value of pressure drawdown (CVPDD) is a key parameter for controlling the production rate for most of the wells in weak sand formations and depends on the form of completion used, particularly in cases of high-pressure/high-temperature (HP/HT). This paper presents a simplified three-dimensional (3D) calculation of CVPDD on the basis of maximum plastic strain for a given well in offshore Gulf of Mexico. A fully-coupled, poro-elastoplastic model was adopted to simulate the porous flow that occurred simultaneously with matrix inelastic deformation. A submodeling technique was adopted to address the discrepancy between the scale of the oil field and that of the wellbore section.

Customer Papers

EXXONMOBIL ENERGY, PROCESS & UTILITIES

Tech Notes

In this work, a numerical-experimental study aimed to better understand the loading rate and damage mechanisms involved on the carried tube, as well as the local deformation response of the full scale component when loaded under real loads are presented.

Customer Papers

Abaqus/Explicit is a well-established and widely used FEM solver for crash and pedestrian safety simulations. However, due to the large number of degrees of freedom, simulation time is still a limiting factor especially in context of structural optimization. In typical crash simulation, a large portion of the model undergoes only elastic deformation. Hence, model order reduction (MOR) methods can bring a significant decrease in the computational time. While Abaqus/Standard already offers several reduction methods, MOR is currently not applicable for Abaqus/Explicit. The purpose of this work is to enable MOR for explicit finite element models by use of superelements. Reduced mass and stiffness matrices are generated by Abaqus/Standard and transferred to the explicit solver through a VUEL subroutine.

Customer Papers

ADMEDES LIFE SCIENCES

Tech Notes

Sequencing and amplification of DNA involves a precisely controlled thermal incubation cycle. Upscaling of traditional thermocyclers can be problematic due to nonuniformities induced across large incubation plates. Multiple chip profiles are studied to compare edge effects and promote uniform thermal histories across the incubation plate. Thermal performance is evaluated via steady-state heating within Abaqus/Standard. Transient cooling is modeled via Abaqus co-simulation by coupling thermal and fluid models.

Customer Papers

Transcatheter aortic valve implantation of fibrin-based tissue engineered heart valves with a tubular leaflet construct have been developed as an alternative to invasive traditional surgical heart valve implantation, but currently need reinforcement to withstand pressures found in the aortic position. To increase valve strength, a PET textile reinforcement has been introduced to the fibrin scaffold. However, care must be taken when using a textile reinforcement. Increasing reinforcement may increase the strength, but also increases stiffness which can interfere with the functionality of the valve, prohibiting full valve closure. In order to predict the behavior of the valve, improve design, and eventually optimize valve performance by tailoring the textile reinforcement, a 4-tiered hierarchical multi-scale modelling framework has been created.

Customer Papers

The Medical device industry is a highly regulated industry with patient safety being paramount. Ensuring the highest quality and patient safety demands that the device performs as desired from the time it is manufactured, through the shelf life of the product, and during use. Plastics used in medical devices can undergo degradation in mechanical properties over time during the product shelf life depending on the design of the device. It is therefore important to take this aspect of plastic behavior into account during material selection and device design. Plastics under constant load for long periods of time exhibit creep deformations. Testing devices for creep can be a lengthy process often leading to delay in design iterations to yield the optimum design and subsequently time to market.

Customer Papers

Being able to visualize blood flow in leaving heart helps to understand heart diseases and define strategy for surgical intervention. The ideal simulation should be performed on a specific patient heart model (individual geometry) to correctly asses the specific cardiac problem and predict possible treatment. In this paper two approaches is presented for simulating blood flow using numerical CFD approach: simulation based on the SIMULIA Living Heart FE Model and simulation based on dynamic 3D heart model obtained from a 3D MRI/MRT scanner. The CFD simulation is performed in both cases using FlowVision CFD code. Both approaches provide a better understanding of the blood flow during a cardiac cycle.

Customer Papers

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