Sensitivity of the macroscopic response of elastic microstructures to the insertion of inclusions

• Autores: Giusti, Sebastian Miguel; Novotny, Antonio A.; De Souza Neto, Eduardo Alberto
• Año de publicación: 2010
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: MULTI-SCALE MODELLING; SENSITIVITY ANALYSIS; SYNTHESIS OF MICROSTRUCTURES; TOPOLOGICAL DERIVATIVE
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

This paper proposes an exact analytical formula for the topological sensitivity of the macroscopic response of elastic microstructures to the insertion of circular inclusions. The macroscopic response is assumed to be predicted by a well-established multi-scale constitutive theory where the macroscopic strain and stress tensors are defined as volume averages of their microscopic counterpart fields over a representative volume element (RVE) of material. The proposed formula-a symmetric fourth-order tensor field over the RVE domain-is a topological derivative which measures how the macroscopic elasticity tensor changes when an infinitesimal circular elastic inclusion is introduced within the RVE. In the limits, when the inclusion/matrix phase contrast ratio tends to zero and infinity, the sensitivities to the insertion of a hole and a rigid inclusion, respectively, are rigorously obtained. The derivation relies on the topological asymptotic analysis of the predicted macroscopic elasticity and is presented in detail. The derived fundamental formula is of interest to many areas of applied and computational mechanics. To illustrate its potential applicability, a simple finite element-based example is presented where the topological derivative information is used to automatically generate a bi-material microstructure to meet pre-specified macroscopic properties.
Fil: Giusti, Sebastian Miguel. Laboratorio Nacional de Computación Científica; Brasil. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Novotny, Antonio A.. Laboratorio Nacional de Computación Científica; Brasil
Fil: De Souza Neto, Eduardo Alberto. Swansea University; Reino Unido