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Papers by Barbara Pintucchi
XII Convegno Nazionale L’Ingegneria Sismica in Italia ANIDIS 2007, 2007
Procedia Structural Integrity, 2018
During their operation, modern aircraft engine components are subjected to increasingly demanding... more During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data.
Journal of Vibration and Control, 2011
There are many studies on vibrations of moving belts originated from automotive belt drives. Thes... more There are many studies on vibrations of moving belts originated from automotive belt drives. These studies, however, mainly consider the nonlinear effect of the transversal vibration of the belt under transversal excitation without considering the coupling effect between the transversal and longitudinal vibrations under longitudinal excitation. In this paper, a nonlinear model is built for a standing tensioned belt periodically excited longitudinally at one end with a known amplitude and frequency and with the other end clamped, which allows for coupling between the periodic longitudinal excitation and transversal vibration. The nonlinear system is solved using the Analog Equation Method. The two coupled nonlinear hyperbolic differential equations of the system are reduced to two uncoupled linear equations pertaining to the longitudinal and transverse deformation of a substitute beam with unit longitudinal and bending stiffness, respectively. The reduced equations are under a fictit...
Procedia Structural Integrity
AIP Conference Proceedings, 2022
IOP Conference Series: Materials Science and Engineering, 2018
Earthquakes represent huge risks for cultural heritage. Although there is a large literature abou... more Earthquakes represent huge risks for cultural heritage. Although there is a large literature about prevention on historical buildings, the seismic assessment on collections and exhibition designs is usually underestimated. "RESIMUS" long running project involves different knowledge and fields; its goal is to prevent seismic damages to museum collections and artefacts, combining both museographical solutions and anti-seismic methods. This contribution focuses on the "Fontana di Giunone", designed in 1555 by Bartolomeo Ammannati and currently kept at the Museo Nazionale del Bargello. The museographical and historical researches have been combined with the seismic performance of the reconstructed Fountain. In this paper the first results provided by the seismic analysis of this artefact are shown. A 3D structural model has been set, based on the three dimensional digital model provided by an detailed laser scanner survey. An elastic dynamic analysis has been performed, by representing the seismic input through an ensemble of seven ground motions expressing the seismic hazard of the area. The analysis has provided the seismic response of the sculptures, evidencing its sensitivity to the dynamic properties of the considered ground motions.
Lecture Notes in Civil Engineering, 2020
Key Engineering Materials, 2019
Within the framework of structural dynamics, the article deals with the problem ofdetermining at ... more Within the framework of structural dynamics, the article deals with the problem ofdetermining at a given moment the probability density function of certain quantities of interest,based on the uncertainties about the initial data, the structure characteristics and the applied loads.The proposed method uses the so-called principle of preservation of probability, and leads towriting a linear partial differential equation for any quantity whose probability density function hasto be determined.
Meccanica, 2019
The article deals with materials with a constraint on the stress, which must belong to a closed a... more The article deals with materials with a constraint on the stress, which must belong to a closed and convex subset of the space of the second order tensors, called stress range. With particular reference to the case of polyhedral stress ranges, the nonlinear elastic constitutive model and the elastoplastic one are compared to each other and a new ''mixed model'' is proposed. The latter may be appropriate in some cases, e.g. for materials unable to withstand traction. The constitutive models, implemented in the finite element code Mady, are applied to some case studies, and some results are compared with those obtained through the Ansys code.
Key Engineering Materials, 2017
This paper deals with non linear elastic materials for which not all the stresses are admis-sible... more This paper deals with non linear elastic materials for which not all the stresses are admis-sible but only those which belong to the stress range, i.e. a closed and convex subset of the spaceof all symmetric tensors. The constitutive equation that has been formulated and explicitly solved issufficiently general to include, besides the so-called masonry-like materials, many others whose stressrange is obtained experimentally or is theoretically defined. The model, implemented into the finiteelement code MADY, has been used to analyze a masonry panel under a bi-directional monotonicallyincremental load and the obtained numerical results have been discussed.
Meccanica, 2017
In the paper, a hyperelastic material with limited tensile and compressive strength is considered... more In the paper, a hyperelastic material with limited tensile and compressive strength is considered. In addition, the maximum value of the tangential component of the stress that can be attained on each plane depends on the intensity of the normal component. Previously formulated for the plane case, the constitutive equation of this material is now extended to three-dimensional bodies, constituting henceforth a generalization of the well-known model of masonrylike materials. The proposed constitutive law has been implemented in the finite element code MADY and has been applied to the study of masonry panels under different load conditions.
Meccanica
The paper presents a method for determining the evolution of the cumulative distribution function... more The paper presents a method for determining the evolution of the cumulative distribution function of random processes which are encountered in the study of dynamic systems with some uncertainties in the characterizing parameters. It is proved that these distribution functions are the solution of a partial differential equation, whose coefficients can be determined once the dynamic system has been solved, and whose numerical solution can be obtained with the finite difference method. Two simple problems are solved here both explicitly and numerically, then the obtained results are compared with each other.
Numerical Modeling of Masonry and Historical Structures, 2019
Abstract Due to the effects of aging and their seismic vulnerability, old masonry structures have... more Abstract Due to the effects of aging and their seismic vulnerability, old masonry structures have often been seriously damage and thus are in need of repair and strengthening. As a response to the challenges involved in conserving these structures, today fiber-reinforced plastic (FRP) composites offer an advantageous solution to restore and reinforce many masonry buildings and monuments. Although the seismic performance of FRP-strengthened masonry appears to be promising, there is still a need for investigations aimed at clarifying their dynamic responses, verifying the effectiveness of various design solutions, and identifying the most suitable ones in a given circumstance. Within this framework, numerical simulations can provide useful indications, but they must also be corroborated by experimental tests.
Developments in the Built Environment, 2022
XII Convegno Nazionale L’Ingegneria Sismica in Italia ANIDIS 2007, 2007
Procedia Structural Integrity, 2018
During their operation, modern aircraft engine components are subjected to increasingly demanding... more During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data.
Journal of Vibration and Control, 2011
There are many studies on vibrations of moving belts originated from automotive belt drives. Thes... more There are many studies on vibrations of moving belts originated from automotive belt drives. These studies, however, mainly consider the nonlinear effect of the transversal vibration of the belt under transversal excitation without considering the coupling effect between the transversal and longitudinal vibrations under longitudinal excitation. In this paper, a nonlinear model is built for a standing tensioned belt periodically excited longitudinally at one end with a known amplitude and frequency and with the other end clamped, which allows for coupling between the periodic longitudinal excitation and transversal vibration. The nonlinear system is solved using the Analog Equation Method. The two coupled nonlinear hyperbolic differential equations of the system are reduced to two uncoupled linear equations pertaining to the longitudinal and transverse deformation of a substitute beam with unit longitudinal and bending stiffness, respectively. The reduced equations are under a fictit...
Procedia Structural Integrity
AIP Conference Proceedings, 2022
IOP Conference Series: Materials Science and Engineering, 2018
Earthquakes represent huge risks for cultural heritage. Although there is a large literature abou... more Earthquakes represent huge risks for cultural heritage. Although there is a large literature about prevention on historical buildings, the seismic assessment on collections and exhibition designs is usually underestimated. "RESIMUS" long running project involves different knowledge and fields; its goal is to prevent seismic damages to museum collections and artefacts, combining both museographical solutions and anti-seismic methods. This contribution focuses on the "Fontana di Giunone", designed in 1555 by Bartolomeo Ammannati and currently kept at the Museo Nazionale del Bargello. The museographical and historical researches have been combined with the seismic performance of the reconstructed Fountain. In this paper the first results provided by the seismic analysis of this artefact are shown. A 3D structural model has been set, based on the three dimensional digital model provided by an detailed laser scanner survey. An elastic dynamic analysis has been performed, by representing the seismic input through an ensemble of seven ground motions expressing the seismic hazard of the area. The analysis has provided the seismic response of the sculptures, evidencing its sensitivity to the dynamic properties of the considered ground motions.
Lecture Notes in Civil Engineering, 2020
Key Engineering Materials, 2019
Within the framework of structural dynamics, the article deals with the problem ofdetermining at ... more Within the framework of structural dynamics, the article deals with the problem ofdetermining at a given moment the probability density function of certain quantities of interest,based on the uncertainties about the initial data, the structure characteristics and the applied loads.The proposed method uses the so-called principle of preservation of probability, and leads towriting a linear partial differential equation for any quantity whose probability density function hasto be determined.
Meccanica, 2019
The article deals with materials with a constraint on the stress, which must belong to a closed a... more The article deals with materials with a constraint on the stress, which must belong to a closed and convex subset of the space of the second order tensors, called stress range. With particular reference to the case of polyhedral stress ranges, the nonlinear elastic constitutive model and the elastoplastic one are compared to each other and a new ''mixed model'' is proposed. The latter may be appropriate in some cases, e.g. for materials unable to withstand traction. The constitutive models, implemented in the finite element code Mady, are applied to some case studies, and some results are compared with those obtained through the Ansys code.
Key Engineering Materials, 2017
This paper deals with non linear elastic materials for which not all the stresses are admis-sible... more This paper deals with non linear elastic materials for which not all the stresses are admis-sible but only those which belong to the stress range, i.e. a closed and convex subset of the spaceof all symmetric tensors. The constitutive equation that has been formulated and explicitly solved issufficiently general to include, besides the so-called masonry-like materials, many others whose stressrange is obtained experimentally or is theoretically defined. The model, implemented into the finiteelement code MADY, has been used to analyze a masonry panel under a bi-directional monotonicallyincremental load and the obtained numerical results have been discussed.
Meccanica, 2017
In the paper, a hyperelastic material with limited tensile and compressive strength is considered... more In the paper, a hyperelastic material with limited tensile and compressive strength is considered. In addition, the maximum value of the tangential component of the stress that can be attained on each plane depends on the intensity of the normal component. Previously formulated for the plane case, the constitutive equation of this material is now extended to three-dimensional bodies, constituting henceforth a generalization of the well-known model of masonrylike materials. The proposed constitutive law has been implemented in the finite element code MADY and has been applied to the study of masonry panels under different load conditions.
Meccanica
The paper presents a method for determining the evolution of the cumulative distribution function... more The paper presents a method for determining the evolution of the cumulative distribution function of random processes which are encountered in the study of dynamic systems with some uncertainties in the characterizing parameters. It is proved that these distribution functions are the solution of a partial differential equation, whose coefficients can be determined once the dynamic system has been solved, and whose numerical solution can be obtained with the finite difference method. Two simple problems are solved here both explicitly and numerically, then the obtained results are compared with each other.
Numerical Modeling of Masonry and Historical Structures, 2019
Abstract Due to the effects of aging and their seismic vulnerability, old masonry structures have... more Abstract Due to the effects of aging and their seismic vulnerability, old masonry structures have often been seriously damage and thus are in need of repair and strengthening. As a response to the challenges involved in conserving these structures, today fiber-reinforced plastic (FRP) composites offer an advantageous solution to restore and reinforce many masonry buildings and monuments. Although the seismic performance of FRP-strengthened masonry appears to be promising, there is still a need for investigations aimed at clarifying their dynamic responses, verifying the effectiveness of various design solutions, and identifying the most suitable ones in a given circumstance. Within this framework, numerical simulations can provide useful indications, but they must also be corroborated by experimental tests.
Developments in the Built Environment, 2022