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Bird strike is a severe high velocity impact load case for all forward-facing aircraft components and a major design driver due to the high energies and the strict safety requirements involved. This paper summarises an experimental and numerical study to design a bird strikeproof lightweight metallic Krueger flap as a high-lift device concept for a laminar wing leading edge of a single aisle short range aircraft. The whole design process was based on numerical optimisations for static load cases in combination with high velocity bird impact simulations, with the focus on accurate modelling of the fluid-like bird projectile, the plasticity of the aluminium material and the failure behaviour of the structural hinges and fastened joints.

Customer Papers

Engineers from wide ranges of industries face an ever increasing need to run virtual tests to simulate complex models for improving reliability as well as reducing product development time and costs. Abaqus Unified FEA is designed to tackle these challenges by producing high-quality realistic simulation solutions, while delivering high performance in productivity by utilizing efficient use of modern compute cluster available in High Performance Computing (HPC). This study presents the techniques and profiling results to further understand Abaqus dependencies on the CPUs, network, and the other underlying hardware and software components. The paper will review the effects by comparing various components using different simulation models on Abaqus.

Customer Papers

Deep excavation, widely used for underground constructions, is a very complex soil-structure interaction problem in geotechnical engineering. Its performance is influenced by the sophisticated soil behavior, complex retaining structures, and variable construction sequences. As the excavation goes deeper and larger in scale, challenges arise for both practical applications and research. Finite element analysis is an effective tool to study its mechanism, which can consider both geotechnical and structural aspects. It provides necessary information on the performance of deep excavations for design purpose, and can also be used to predict the behavior of deep excavation and provide guidance for the construction. The main issues involved with the finite element analysis of deep excavations include selecting appropriate constitutive models for soils and structures, the simulation of the construction procedure, and the modelling of the soil/structure interface. These issues are addressed in detail based on the use of Abaqus. The application of this procedure is demonstrated through a detailed analysis of a deep excavation case history. Results showed that the finite element analysis can capture the performance of the deep excavation satisfactorily.

Customer Papers

This paper deals with the design of a steel/aluminum tapped thread joint. The concept developed by Schneider (Schneider,2011) is used as the basis for assessment up to the occurrence of technical cracks. Crack propagation, up to component failure, is described with linear elastic fracture mechanics and using the finite element method (FEM). For the purpose of validating the concept, the calculated lives are compared with experimental tests.

Customer Papers

The aim of this paper is the implementation of a 3D fraction al viscoelastic constitutive law in a user material subroutine (UMAT) in the finite element software Abaqus. Essential to the implementation of the model is access to the strain history at each Gauss point of each element in a constructive manner. Details of the UMAT and comparison with some analytical results are presented in order to show that the fractional viscoelastic constitutive law has been successfully implemented.

Customer Papers

The problem of a fluid-driven (hydraulic) fracture propagating in a porous medium is studied using recently co-developed capabilities in SIMULIA Abaqus Standard (“Abaqus”) for fully-coupled simulation of hydraulic fracturing. The hydraulic fracturing simulation capabilities are validated against lab-scale experimental results. A Polyaxial Test Cell (PTC) is set up for controlled hydraulic fracturing in fabricated rock samples allowing different testing conditions of confining stress, injection rate, and rock and fluid properties. Two representative regimes of fracture propagation (toughness/storage and viscosity/leak-off) are selected to compare against numerical simulations carried out in Abaqus.

Customer Papers

The soil resistances in axial and lateral direction strongly affect the behavior of earthburied district heating pipes under variable operating temperatures. The state of knowledge regarding these resistance forces is summarized, and it is shown that almost no information exists regarding the cyclic effects on lateral soil resistances. However, for the safe design of a district heating network, the forces that soil can exert on the structure due to relative soil-pipe displacements are of particular interest. So, a numerical model has been developed, using the concept of hypoplasticity as an advanced constitutive model for noncohesive, granular materials.

Customer Papers

One of the significant challenges in oil wells is to maintain adequate structural and sealing capacities of casing and tubing connections. In particular, unconventional wells, such as thermal and HPHT wells, require elevated standards to evaluate structural integrity and sealability of tubular connections. This paper presents a Reliability Based Design & Assessment (RBDA) methodology that characterizes system safety using a quantitative estimate of reliability. This paper also presents an FEA example of a generic premium connections to demonstrate the use of the proposed methodology.

Customer Papers

The Virtual Factory (VF) can put composites manufacturing simulations in the hands of those who need them to invent new and innovative ways to capture the extraordinary benefits of these high performance products at an acceptable manufactured cost. “Crowd-sourcing” is the new way to drive innovation where contributions from organizations, large and small, are joined in the development of new products. The VF provides the user with simple browser access to powerful tools that simulate the actual steps and outcome conditions of a complex manufacturing process without the need to download and maintain software in the conventional manner. Learning to use uncertainty quantification (UQ) with manufacturing simulation tools will also be accomplished on the VF in order to allow for continuous learning and growth of the human talent required in composites manufacturing.

Customer Papers

High velocity perforation problem is taken as a benchmark to validate material plasticity and fracture models. 2024-T3(51) aluminum alloy is chosen as a reference material. Numerical simulations of a plate perforation using Johnson-Cook plasticity model with two sets of parameters, Johnson-Cook fracture criterion with one set of fitting parameters and pressure and Lode dependent ductile fracture criterion with three sets of material constants are performed into Abaqus/Explicit. Calibration of all the material constants is accomplished using results of quasistatic and high strain rate experiments.

Customer Papers

This research seeks to model and elucidate the physics of water impact of elastomeric spheres, including the mechanisms by which severe deformations enable spheres to skip off the free water surface. The interplay between solid mechanics and fluid mechanics, or fluid-structure interaction, is extremely rich and complicated for this physical phenomenon. This research and knowledge could lead to exciting applications such as the novelty products from Waboba Inc. Numerical simulations are performed in Abaqus/Explicit of a highly-compliant elastomeric sphere impacting a free surface of water using a Coupled Euler-Lagrangian (CEL) approach.

Customer Papers

A multidirectional, carbon fiber/epoxy, composite panel is subjected to a simulated lightning strike, within a finite element method framework, and the effect of material properties on the failure (delamination) response is investigated through a detailed numerical study. The numerical model of the composite panel consists of individual homogenized plies with userdefined, cohesive interface elements between them. Lightning strikes are simulated as an assumed combination of excessive heat and high pressure loadings. It is observed that the initiation and propagation of lightning-induced delamination is a significant function of the temperature dependency of interfacial fracture toughness.

Customer Papers

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