Andrea Panteghini

Andrea Panteghini
Università degli Studi di Brescia | UNIBS · Department of Civil Engineering, Architecture, Land, Environment and Mathematics

Ph.D.

About

34
Publications
41,385
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
551
Citations
Citations since 2016
19 Research Items
483 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Introduction
Andrea Panteghini currently works at the Department of Civil Engineering, Architecture, Land, Environment and Mathematics, Università degli Studi di Brescia. Andrea does research in Computational Mechanics, Geotechnics, Materials Engineering and Civil Engineering.
Additional affiliations
November 2011 - present
Università degli Studi di Brescia
Position
  • Professor (Assistant)

Publications

Publications (34)
Article
Full-text available
The paper presents a new tension failure criterion which generalizes the so-called Galileo-Rankine formulation. The criterion can be used as a component of the so-called perfectly no-tension model for masonry and cements as well as for establishing a tension cut-off in complex constitutive models for soils, granular materials and powders. The crite...
Article
Under small strains and rotations, we apply a phenomenological higher-order theory of distortion gradient plasticity to the torsion problem, here assumed as a paradigmatic benchmark of small-scale plasticity. Peculiar of the studied theory, proposed about ten years ago by Morton E. Gurtin, is the constitutive inclusion of the plastic spin, affectin...
Article
Full-text available
In this paper, it is mathematically demonstrated that classical yield and failure criteria such as Tresca, von Mises, Drucker–Prager, Mohr–Coulomb, Matsuoka–Nakai and Lade–Duncan are all defined by the same equation. This can be seen as one of the three solutions of a cubic equation of the principal stresses and suggests that all such criteria belo...
Article
We consider work-conjugate Gradient Plasticity (GP) theories involving both energetic and dissipative higher-order contributions. We show that the conceptually most straightforward Finite Element (FE) implementation, in which the displacement components and the relevant plastic distortion contributions are employed as nodal degrees of freedom, lead...
Article
The Cosserat continuum is very effective in regularizing the ill-posed governing equations of the Cauchy/Maxwell continuum. An elasto-plastic constitutive model for the linear formulation of the Cosserat continuum is here presented, which features non-associated flow, hardening/softening behaviour and multiple yield and plastic potential surfaces,...
Article
A Finite Element (FE) procedure based on a fully implicit backward Euler pre-dictor/corrector scheme for the Cosserat continuum is here presented. The integration algorithm is suitable for yield and plastic potential surfaces with general shape in the deviatoric plane. The key element of the integration scheme is the spectral decomposition of the s...
Preprint
The Cosserat continuum is used in this paper to regularize the ill-posed governing equations of the Cauchy/Maxwell continuum. Most available constitutive models adopt yield and plastic potential surfaces with a circular deviatoric section. This is a too crude an approximation which hinders the application of the Cosserat continuum into practice, pa...
Preprint
A Finite Element procedure based on a full implicit backward Euler predictor/corrector scheme for the Cosserat continuum is here presented. Since this is based on invariants of the stress and couple stress tensors and on the spectral decomposition of the former, considerable benefits are achieved. The integration requires the solution of a single e...
Article
This work presents an efficient procedure to predict the sound reduction index (SRI) of a flat panel of arbitrary internal complexity starting from numerical finite element (FE) simulations. This hybrid analytical-FE procedure allows to perform narrow band calculations considering fluid coupling up to high frequencies. The exciting sound field is s...
Article
In this contribution we show that the distortion gradient plasticity recently proposed by our group, characterised by a higher-order plastic potential leading to reliable predictions under non-proportional loading, can predict experimental data of literature on the cyclic torsion of copper wires of diameter ranging from 18 to 42 micrometres. To rea...
Article
We propose a plastic potential for higher-order (HO) phenomenological strain gradient plasticity, predicting reliable size-dependent response for general loading histories. By constructing the free energy density as a sum of quadratic plastic strain gradient contributions that each transition into linear terms at different threshold values, we show...
Article
The need for high energy density and micro-scaled power sources is pushing researchers and industries towards the development of three-dimensional architecture micro-batteries and structural batteries. In this perspective, solid polymer electrolytes (SPEs) represents an appealing alternative to conventional (liquid) electrolyte. Due to their intrin...
Article
Hypo-elastic relations are often adopted to simulate the recoverable non-linear behaviour of soils within elasto-plastic constitutive models. In reality they are unable to reproduce the elastic, i.e. recoverable, response of materials, hence they introduce severe inconsistencies in models based on the decomposition of the total strain tensor into i...
Article
This study focuses on a lightweight syntactic foam constituted by an epoxy matrix filled with polydispersed Glass Microballoons (GMs) up to 0.75 volume fraction. We present experimental results on hydrostatic loading which demonstrate the possibility of different failure modes depending on whether the surface of the composite is painted/coated or n...
Article
We focus on Gurtin's gradient plasticity (GP) theory adopting Nye's tensor as primal higher-order (HO) kinematic variable, contributing to the free energy. In the absence of other HO kinematic variables, this framework is characterised by kinematic HO boundary conditions (BCs) which admit discontinuity in some components of the plastic distortion....
Article
Yield and plastic potential surfaces are often affected by problems related to con-vexity. One such problem is encountered when the yield surface that bounds the elastic domain is itself convex; however, convexity is lost when the surface expands to pass through stress points outside the current elastic domain. In this paper, a technique is propose...
Article
This paper presents a new yield function, defined in terms of stress invariants and suitable for isotropic geomaterials. It is a generalization of that of the Modified Cam-Clay model and as such it retains all the mathematical advantages of the original formulation which are particularly convenient for the numerical integration of the constitutive...
Article
Syntactic foams are lightweight composite materials that find extensive application as core materials for sandwich panels in marine and aerospace structures. While several models have been proposed to analyze the elastic response and failure of these composites at small strain rates, the understanding of syntactic foam behavior at high strain rates...
Article
This paper presents an approach to use the method of characteristics in plane strain problems with failure criteria other than the Mohr–Coulomb and Tresca. Although the method is of general validity, an instance of application is presented for the evaluation of the vertical plastic collapse load of a rigid shallow strip footing resting on a purely...
Article
We further develop and improve a structural theory recently proposed by our group, with the aim of determining the simplest kinematics which allows the accurate modelling of any plane sandwich beam in the linear elastic regime. The model builds on Yu-Krajcinovic zig-zag warping, in which each layer, of arbitrary thickness and modulus, is allowed to...
Article
This work is concerned with particulate composites filled with hollow spherical inclusions, i.e., syntactic foams. We aim at the micromechanical evaluation of the effective uniaxial compressive strength for the most relevant case of glass inclusions of wall thickness of few micrometers (microballoons) filling a thermoset matrix. We develop a three-...
Article
We propose a micromechanical model for the quasi-brittle failure of syntactic foams subject to uniaxial compression. We focus on a failure characterised by shear bands inclined of about 45 degrees with respect to the loading axis, often observed in thermoset polymers filled with glass microballoons. Our objective is to develop a three-dimensional F...
Article
An analytical solution for the estimation of the drawing force requested to perform a three dimensional drawing of a rectangular plate is presented. It has been developed using the limit analysis technique, on the basis of a three-dimensional velocity field, under the main assumptions of constant friction and perfect plasticity. To overcome the lim...
Article
The influence of the shape of the plastic potential in the deviatoric plane on plane strain collapse is investigated. The most commonly employed elastic-perfect plastic models are considered, which adopt well-known failure criteria for defining the yield and plastic potential surfaces, namely the von Mises, the Drucker–Prager, the Tresca, the Mohr–...
Article
This paper presents a reformulation of the original Matsuoka–Nakai criterion for overcoming the limitations which make its use in a stress point algorithm problematic. In fact, its graphical representation in the principal stress space is not convex as it comprises more branches, plotting also in negative octants, and it does not increase monotonic...
Article
Full-text available
This paper presents a novel formulation for defining soil failure. It plots in the principal stress space as a surface with the shape ranging between an approximation of the Matsuoka–Nakai and of the Mohr–Coulomb criteria depending on the value of a single parameter. The new function can be used as a replacement of the original equations of these w...
Article
Full-text available
We aim at understanding the multislip behaviour of metals subject to irreversible deformations at small-scale. By focussing on the simple shear of a constrained single-crystal strip, we show that discrete Dislocation Dynamics (DD) simulations predict a strong latent hardening size effect, with smaller being stronger in the range [1.5 micron, 6 micr...
Article
A Gurson-based constitutive model is presented, which includes non-linear mixed isotropic–kinematic hardening and creep, and allows the analysis of problems involving arbitrarily large plastic strains. This model was developed with the main objective of allowing, on the basis of a single set of material parameters, the numerical simulation of all t...
Article
Full-text available
Improved analytical solutions developed to design and optimize cold wire drawing processes are proposed. They account for strain-hardening, which could be accounted for, in the equations usually adopted in the engineering practice, only in a semi-empirical way. All the new proposed solutions can be expressed in terms of the coefficient of friction...
Article
Residual stress profiles in a cold drawn steel wire are calculated by means of a Finite Element technique. Since the wire points are subjected, during drawing, to a non-monotonic loading path, an accurate description of cyclic plasticity is essential, in these analyses. It is demonstrated that the commonly adopted assumption of isotropic hardening...
Article
The acoustic design of rooms for listening to music or recording is a very difficult subject: in order to improve the acoustic performance of these confined rooms, it may be necessary to absorb noise energy; sometimes all audible frequencies of the spectrum, sometimes at some specific frequencies. The design is especially difficult at low frequenci...
Article
This work illustrates an engineering approach for the analysis of plywood/fibreglass perforated panels, to be used for the linearisation of the frequency response of medium size rooms below 200Hz. The sound absorption coefficient of these panels is computed, by means of coupled acoustical/structural finite element (FEM) analyses, as a function of t...
Article
Perforated panels can be used as devices for the selective acoustic correction of rooms. Unlike panels made by porous materials, they work principally at low and middle frequency, and are acoustically inert at high frequency. For this reason, their main application is for the correction of modal resonances of rooms. Perforated panels consist of one...

Network

Cited By

Projects

Projects (6)
Archived project
The goal of this scientific research is the development of constitutive models for metals subject to large deformations, which allow the simulation of metal forming processes using the Finite Element method. The objective of these simulations in engineering practice is twice. Firstly, using parametric analyses, one will design a productive process that minimizes the costs. Secondly, especially for cold processes, one can simulate (and the optimize) the mechanical properties of the produced pieces. Especially for this scope, it is fundamental both the correct reproduction of the residual stress profiles in the work pieces, and the accurate modeling of the material mechanical behavior, usually subject during the process to severe loading? unloading cycles with very large plastic strains, difficult to be correctly reproduced numerically. Finally, these constitutive models should allow the simulation of defects (such as chevron cracks or surface defects) in the work pieces, due for example to wrong combinations of design parameters.
Archived project
This research project is focused on the development of analytical tools for the estimation of the force to cold draw wires or rectangular plates. These analytical models must take into account the different combination of die geometries, area reduction, and the friction conditions. Such models are very important to the design of drawing metal forming processes. In fact, even if the numerical analyses are probably the most powerful tool today available to optimize metal forming processes, the design of a real industrial process involves parametric analyses, which require a single numerical simulation for each combination of the process parameters. For this reason, analytical models, allowing (at least) an initial design of the process, are very important. Moreover, it should be noted that the most adopted design procedures of metal forming processes in the engineering practice are still based on the limit analysis technique. The developed analytical solutions are based on the limit analysis techniques.
Project
We aim at developing structural models to accurately predict the stress state in sandwich beams under flexure, for any reliable relative stiffness between the layers, and subject to “severe boundary conditions”, including loading on a specific skin coupled with constraints realised, on certain cross-sections, on the opposite skin only. We apply our modelling approach also to concrete-timber beams warped by midlayer slip.