SIMULIA Resource Center

Today, numerous aeroelastic structures are deployed over a finite time period, such as flaps, spoilers, control surfaces, and wheel bay and bomb bay doors. These devices must be both divergence and flutter free. Current state-of-art simulations verify this by applying a quasi-steady assumption that does not require the system to physically deploy within the computations. That is, the structure is assumed elastic but does not possess the “large” motion associated with the device’s path of travel. While these simulations have strong technical merit, especially in the case where a structure is inadvertently locked in a partially deployed position, they are unable to capture all of the relevant physics.

Customer Papers

Composite materials based on thermoplastic matrix became a popular choice as a material for modern structures. Nevertheless, the manufacturing process of this type of materials have many technology parameters, which have to be determined before the first composite part is produced. The study of influence of all parameters on final quality of composite part by means of technological experiments are time and cost consuming. This makes engineers to study the way of the modeling of thermoplastic composite forming process. This research is dedicated to the modeling of thermoplastic material under different conditions.

Customer Papers

Fokker Landing Gear has a history in development of composite technology for landing gear applications. In order to successfully design and qualify composite landing gear parts it is essential to be able to reliably predict the mechanical and failure behavior of the composite material. Therefore the goal of this study was to develop, calibrate and validate a material model which can be used to reliably predict the failure behavior of fiber-reinforced composites. In the developed material model the fibers and resin are modelled as separate materials with their own specific material and failure behavior. The interaction between the fibers and resin is accounted for using a (proprietary) modified Mori-Tanaka approach.

Customer Papers

The latest generation of rotary steerable drilling systems make it possible to reach hydrocarbons located deeper and in more hostile environments than ever before. These systems give the directional driller, standing some 10,000ft above on the rig floor, the ability to steer the well path in real-time to reach the elusive ‘pay zone’. Rotary steerable drilling systems, which are located at the end of the drilling assemblies, are exposed to extreme conditions. In addition to temperatures in excess of 390°F and pressures up to 25,000 psi, they must also convey compressive and bending loads, torque and rotation to the drill bit from the surface, all while controlling the 3D trajectory of the wellbore.

Customer Papers

In the oil and gas industry, steam assisted gravity drainage (SAGD) is an operation where steam is injected into a reservoir to lower the viscosity of heavy oil to allow its production. The injection of steam leads to thermally induced stresses and pore pressure changes in the reservoir and its proximity. Although the pressure and temperature evolution can be modelled with reservoir simulators, they neglect the change of the stress field in relation to these properties, which can impact the stability of faults and fractures. These active faults and fractures, in turn, affect the fluid transport properties. In order to assess the potential for fault and fracture (re-)activation we created a model of a SAGD operation by coupling the outcome of a reservoir simulation to a 4D geomechanical finite-element model using Abaqus.

Customer Papers

This paper describes a new computational approach aimed at investigating the crack propagation inside smart structures equipped with surface bonded piezoelectric layers, when the electromechanical coupling due to piezoelectric phenomenon is exploited. The Abaqus code is used to perform a prediction of both the fracture mechanics and the coupled response of the structure, through a suitable connection between the two solution environments, being provided by the Isight tool. A preliminary analysis is shown and some significant results are proposed.

Customer Papers

This study presents a three-dimensional (3D) micromechanics-based nonlinear framework for the analysis of discontinuous long-fiber (DLF) thermoplastic composite materials and structures. The proposed material modeling framework is a nested micromechanical approach that explicitly recognizes the composite system within the cross-section of a DLF composite member. The overall modeling approach is able to predict both the elastic and nonlinear response of the composite material based on the in-situ properties and response of the fiber and matrix constituents. Coupon tests are used to calibrate the in-situ linear and nonlinear properties of the fiber and matrix.

Customer Papers

The University of Southern California Rocket Propulsion Laboratory (USCRPL) is developing a single stage sounding rocket that is intended to deliver a small electronics payload past the Kármán line at 100 km altitude. A full scale static firing of the solid fuel booster was required in order to obtain the necessary launch permits from the Federal Aviation Administration and Bureau of Land Management. Though successfully demonstrated in sub-scale static and flight testing, this entirely carbon composite combustion chamber experienced catastrophic failure during consecutive static firings. As part of the anomaly investigation into this ground test failure, the Composite Modeler for Abaqus/CAE was used to identify the root cause.

Customer Papers

Bolted joints are frequently used connections in many engineering systems, and crucial parts of the heat transfer path in structures. During the design phase, heat transfer across the joints must be modelled properly in order to determine the accurate temperature distribution on components. Usually in finite element models, perfect thermal contact between mating surfaces is assumed. However; this approach is inadequate and may bring on misleading results owing to the equality of temperature assumption between surfaces. In this study, transient conduction heat transfer through the bolted joints was modelled in Abaqus/CAE by defining gap conductance between the abutting surfaces.

Customer Papers

The cold rolling process is one of the most important in the metal industry. The strips produced by this process are used in different applications. The quality and shape control of these products are very important factors during the production process. It is well known that the strip shape is influenced by: the rolling speed, strip width, forces, rolls deflection, etc. This work considers modelling a 4 high cold rolling process and obtains the strip profile, with a static model using an arc contact with springs representing the whole model. This idealized model was developed to reduce the computational time of the dynamic model being used.

Customer Papers

Uni-directional glass fiber reinforced polymers play a central role in the task increasing the length of wind turbines blades and thereby lowering the cost of energy from wind turbine installations. During this, optimizing the mechanical performance regarding material stiffness, compression strength and fatigue performance is essential. Nevertheless, testing composites includes some challenges regarding stiffness determination using conventional strain gauges and achieving correct material failure unaffected by the gripping region during fatigue testing. Challenges, which in the present study, has been addressed using the finite element method. During this, a verification of experimental observations, a deeper understanding on the test coupon loading and thereby improved test methods has been achieved.

Customer Papers

: The buckling of axially compressed cylindrical shells is known to be sensitive to imperfections, as is the buckling of spherical shells under external pressure. Regarding these problems, a very slight imperfection can be the starting point from which local deformation is initiated and developed and, consequently, overall structural stability is lost. Therefore, it has been very difficult to pursue an analysis using the conventional approach, which is typically represented by the arc-length method. The methodology developed in our previous study demonstrates the applicability of the artificial damping method of Abaqus from which we can overcome the difficulty in performing the analysis due to local instability. This paper describes the application of the technique for the generation of singularities in large-deformed viscoelastic and elastoplastic cylindrical shells, which is expected to be utilized in the packaging of food, daily articles, and pharmaceuticals.

Customer Papers