The Experts below are selected from a list of 34530 Experts worldwide ranked by ideXlab platform

Ivica Smojver - One of the best experts on this subject based on the ideXlab platform.

  • hybrid approach in bird strike damage prediction on aeronautical composite Structures
    Composite Structures, 2011
    Co-Authors: Darko Ivancevic, Ivica Smojver
    Abstract:

    This paper deals with the problem of numerical prediction of bird strike induced damage on aeronautical Structures. The problem of soft body impacts has been tackled by applying a hybrid Eulerian Lagrangian technique, thereby avoiding numerical difficulties associated with extensive mesh distortion. Eulerian modeling of the bird impactor resulted in a more realistic behavior of bird material during impact, which has lead to an enhanced response of the Impacted Structure. The work presented in this paper is focused on damage modeling in composite items of aeronautical Structures. The bird impactor model and damage modeling approaches have been validated by comparison with experimental gas gun results available in the open literature, while the complete damage prediction procedure has been demonstrated on a complex airplane flap Structure finite element model.

Darko Ivancevic - One of the best experts on this subject based on the ideXlab platform.

  • hybrid approach in bird strike damage prediction on aeronautical composite Structures
    Composite Structures, 2011
    Co-Authors: Darko Ivancevic, Ivica Smojver
    Abstract:

    This paper deals with the problem of numerical prediction of bird strike induced damage on aeronautical Structures. The problem of soft body impacts has been tackled by applying a hybrid Eulerian Lagrangian technique, thereby avoiding numerical difficulties associated with extensive mesh distortion. Eulerian modeling of the bird impactor resulted in a more realistic behavior of bird material during impact, which has lead to an enhanced response of the Impacted Structure. The work presented in this paper is focused on damage modeling in composite items of aeronautical Structures. The bird impactor model and damage modeling approaches have been validated by comparison with experimental gas gun results available in the open literature, while the complete damage prediction procedure has been demonstrated on a complex airplane flap Structure finite element model.

Jeanphilippe Ponthot - One of the best experts on this subject based on the ideXlab platform.

  • the particle finite element method for the numerical simulation of bird strike
    International Journal of Impact Engineering, 2017
    Co-Authors: Marco Lucio Cerquaglia, Geoffrey Deliege, Romain Boman, Luc Papeleux, Jeanphilippe Ponthot
    Abstract:

    Abstract The Particle Finite Element Method (PFEM) is evaluated in the context of the numerical simulation of bird strike events. To assess the possibilities of the method, theoretical analyses are initially performed based on the impact of a water jet on a rigid surface. Then, the influence of the geometry of a more realistic projectile is analyzed and the capability of the method to take into account separation and fragmentation is highlighted. Finally, the method is tested for impacts against deformable targets, using a partitioned algorithm with dynamic relaxation for the fluid-Structure interaction, combining the PFEM for the description of the bird with a non-linear Finite Element approach for the description of the Impacted Structure, which can undergo large plastic deformations. To assess the quality of the obtained results a series of numerical examples from the literature has been selected and used as a reference throughout the paper. Among the studies presented in this work also a novel numerical benchmark for the evaluation of bird impact simulations is proposed.

Francesco Di Caprio - One of the best experts on this subject based on the ideXlab platform.

  • crashworthiness of a composite wing section numerical investigation of the bird strike phenomenon by using a coupled eulerian lagrangian approach
    Journal of Materials Engineering and Performance, 2019
    Co-Authors: Salvatore Saputo, Andrea Sellitto, Francesco Di Caprio
    Abstract:

    Crashworthiness is defined as the capability of a Structure to guarantee its occupants safety during a crash event. In the present work, the crashworthiness of a composite wing section, subjected to a bird strike event, has been investigated. Indeed, the mechanical behavior of the Impacted wing section has been inspected by means of the FE code Abaqus/Explicit. The impact phenomenon has been numerically simulated with a coupled Eulerian–Lagrangian (CEL) approach. The Impacted Structure has been modeled considering a Lagrangian formulation, while a Eulerian one has been used to model the bird. Moreover, Eulerian–Lagrangian contacts are used for transfer the loads arising from the impact event to the Lagrangian Structure. The proposed numerical model, capable to take into account the matrix and fiber traction and compression damages, uses a 3D finite element approach to better predict the deformations and the damages onset and propagation during the impact event. The numerical results, in terms of structural deformation and damage onset and propagation, have been obtained by considering different impact locations and different impact angles.

Dai Zhen - One of the best experts on this subject based on the ideXlab platform.

  • Suggestion of the DLV dimensionless number system to represent the scaled behavior of Structures under impact loads
    'Springer Science and Business Media LLC', 2019
    Co-Authors: Wang Shuai, Xu Fei, Dai Zhen
    Abstract:

    A group of dimensionless numbers, termed DLV (Density-Length-Velocity) system, is put forward to represent the scaled behavior of Structures under impact loads. It is obtained by means of the Buckingham Pi theorem with an alternative basis. The distinct features of this group of dimensionless numbers are that it relates physical quantities of the Impacted Structure with essential basis of the Density, the Length and the Velocity, and thus it can represent the scaled influence of material property, geometry characteristic and velocity on the behavior of Structures. The newly 15 proposed dimensionless numbers reflect three advantages. (1) The intuitively clear physical significance of these dimensionless numbers, such as the ratios of force intensity, force, moment of inertia to the corresponding dynamic quantities, the Johnson's damage number Dn and Zhao's response number Rn etc. are naturally included. (2) The property of direct matching the dimensionless expression of response equations of dynamic problems with these dimensionless numbers through simple equation analysis; (3) The ability of addressing non-scaling problems for different materials and strain-rate-sensitive as well as the VSG (initial impact Velocity-dynamic flow Stress-impact mass G) system. Four classical impact models are used to verify the direct matching property and the non-scaling addressing ability of the DLV system by equation analysis. The results show that the proposed dimensionless number system is simple, clear and efficient, and we suggest using it to represent the scaled behavior of Structures under impact loads