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Title: Analysis of Sandwich Shells with Metallic Foam Cores based on the Uniaxial Tensile Test

Abstract

On this work, the authors present the development and evaluation of an innovative system able to perform reliable panels of sandwich sheets with metallic foam cores for industrial applications, especially in automotive and aeronautical industries. This work is divided into two parts; in the first part the mathematical model used to describe the behavior of sandwich shells with metal cores form is presented and some numerical examples are presented. In the second part of this work, the numerical results are validated using the experimental results obtained from the mechanical experiments. Using the isotropic hardening crushable foam constitutive model, available on ABAQUS, a set of different mechanical tests were simulated. The isotropic hardening model available uses a yield surface that is an ellipse centered at the origin in the p-q stress plane. Using this constitutive model, the uniaxial tensile test for this material was simulated, and a comparison with the experimental results was made.

Authors:
; ; ;  [1];  [2];  [3]
  1. IDMEC-FEUP, Rua Dr. Roberto Frias, 4200-465, Porto (Portugal)
  2. INEGI, Rua Dr. Roberto Frias, 4200-465, Porto (Portugal)
  3. Universidade de Aveiro, Campus Universitario de Santiago, 3810-193, Aveiro (Portugal)
Publication Date:
OSTI Identifier:
21516707
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1353; Journal Issue: 1; Conference: ESAFORM 2011: 14. international ESAFORM conference on material forming, Belfast, Northern Ireland (United Kingdom), 27-29 Apr 2011; Other Information: DOI: 10.1063/1.3589685; (c) 2011 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; COMPARATIVE EVALUATIONS; HARDENING; MECHANICAL TESTS; POROUS MATERIALS; SIMULATION; STRESSES; SURFACES; ELEMENTS; EVALUATION; MATERIALS; MATERIALS TESTING; METALS; TESTING

Citation Formats

Mata, H., Fernandes, A. A., Parente, M. P. L., Jorge, R. Natal, Santos, A., and Valente, R. A. F. Analysis of Sandwich Shells with Metallic Foam Cores based on the Uniaxial Tensile Test. United States: N. p., 2011. Web. doi:10.1063/1.3589685.
Mata, H., Fernandes, A. A., Parente, M. P. L., Jorge, R. Natal, Santos, A., & Valente, R. A. F. Analysis of Sandwich Shells with Metallic Foam Cores based on the Uniaxial Tensile Test. United States. doi:10.1063/1.3589685.
Mata, H., Fernandes, A. A., Parente, M. P. L., Jorge, R. Natal, Santos, A., and Valente, R. A. F. 2011. "Analysis of Sandwich Shells with Metallic Foam Cores based on the Uniaxial Tensile Test". United States. doi:10.1063/1.3589685.
@article{osti_21516707,
title = {Analysis of Sandwich Shells with Metallic Foam Cores based on the Uniaxial Tensile Test},
author = {Mata, H. and Fernandes, A. A. and Parente, M. P. L. and Jorge, R. Natal and Santos, A. and Valente, R. A. F.},
abstractNote = {On this work, the authors present the development and evaluation of an innovative system able to perform reliable panels of sandwich sheets with metallic foam cores for industrial applications, especially in automotive and aeronautical industries. This work is divided into two parts; in the first part the mathematical model used to describe the behavior of sandwich shells with metal cores form is presented and some numerical examples are presented. In the second part of this work, the numerical results are validated using the experimental results obtained from the mechanical experiments. Using the isotropic hardening crushable foam constitutive model, available on ABAQUS, a set of different mechanical tests were simulated. The isotropic hardening model available uses a yield surface that is an ellipse centered at the origin in the p-q stress plane. Using this constitutive model, the uniaxial tensile test for this material was simulated, and a comparison with the experimental results was made.},
doi = {10.1063/1.3589685},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1353,
place = {United States},
year = 2011,
month = 5
}
  • Metallic sandwich panels composed of two face sheets and cores with low relative density have lightweight characteristics and various static and dynamic load bearing functions. To predict the forming characteristics, performance, and formability of these structured materials, full 3D modeling and analysis involving tremendous computational time and memory are required. Some constitutive continuum models including homogenization approaches to solve these problems have limitations with respect to the prediction of local buckling of face sheets and inner structures. In this work, a computationally efficient FE-analysis method incorporating a virtual equivalent projected model that enables the simulation of local buckling modes ismore » newly introduced for analysis of metallic sandwich panels. Two-dimensional models using the projected shapes of 3D structures have the same equivalent elastic-plastic properties with original geometries that have anisotropic stiffness, yield strength, and hardening function. The sizes and isotropic properties of the virtual equivalent projected model have been estimated analytically with the same equivalent properties and face buckling strength of the full model. The 3-point bending processes with quasi-two-dimensional loads and boundary conditions are simulated to establish the validity of the proposed method. The deformed shapes and load-displacement curves of the virtual equivalent projected model are found to be almost the same as those of a full three-dimensional FE-analysis while reducing computational time drastically.« less
  • This method covers the determination of shear properties of sandwich constructions associated with shear distortion of planes parallel to the edge plane of the sandwich. It covers the determination of shear strength parallel to the plane of the sandwich, and the shearing modulus associated with strains in a plane normal to the facings. The test may be conducted on core materials in which case facings are not bonded to the core and loading plates are bonded directly to the core. The dimensions and conditioning of the specimens, procedure of the testing and calculations of results are described.
  • World-wide vehicles safety experts agree that significant further reductions in fatalities and injuries can be achieved as a result of the use of new lightweight and energy absorbing materials. On this work, the authors present the development and evaluation of an innovative system able to perform reliable panels of sandwich sheets with metallic foam cores for industrial applications. The mathematical model used to describe the behavior of sandwich shells with metal cores foam is presented and some numerical examples are presented. In order to validate those results mechanical experiments are carried out. Using the crushable foam constitutive model, available onmore » ABAQUS, a set of different mechanical tests were simulated. There are two variants of this model available on ABAQUS: the volumetric hardening model and the isotropic hardening model. As a first approximation we chose the isotropic hardening variant. The isotropic hardening model available uses a yield surface that is an ellipse centered at the origin in the p-q stress plane. Based on this constitutive model for the foam, numerical simulations of the tensile and bulge test will be conducted. The numerical results will be validated using the data obtained from the experimental results.« less
  • These methods cover determination of the compressive properties of sandwich cores. These properties are usually determined for design purposes, in a direction normal to the plane of facings as the core would be placed in a structural sandwich construction. The test procedures pertain to compression in this direction in particular, but also can be applied with possible minor variations to determining compressive properties in other directions. Two test methods are described as follows: method A provides complete deformation data, and; method B, an alternative method, measures crushing strength only.
  • Squeeze casting was used for processing two new types of composites: pure Al matrix composites reinforced with fibers of Inconel 601, and AS13 (Al-12% Si) matrix composites reinforced with fibers of Inconel 601 or stainless steel 316L. The fibers are continuous with a diameter of 12 {micro}m and their volume fraction in the composites varied from 20 to 80%. The processing conditions were such that no trace of interfacial reaction compound or of matrix precipitate resulting from the dissolution of elements of the fibers could be detected. The quality of the process was attested by Young`s modulus and electrical conductivitymore » measurements. Tensile tests were carried out from room temperature up to 300 C. The composites with the pure Al matrix present a remarkable tensile ductility. They thus constitute convenient materials for assessing continuum plasticity models for composites. Properties of composites with the AS13 matrix are much affected by interface adhesion strength.« less