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Papers by Andrzej Ambroziak

The paper presents an analysis of a membrane-hanging roof subjected to climatic loadings. Discuss... more The paper presents an analysis of a membrane-hanging roof subjected to climatic loadings. Discussion of the fundamental equations of the dense net model, used to describe the behaviour of coated woven fabric, and the concept of the climatic loadings is included.

Journal of Materials in Civil Engineering, 2015

The paper is focused on the comparison between uniaxial and biaxial laboratory test results for t... more The paper is focused on the comparison between uniaxial and biaxial laboratory test results for the polyester coated fabric. A short literature review concerning coated woven fabrics with emphasis on biaxial tensile tests is presented. A description of the polyester coated fabric under biaxial test by means of constitutive models and material parameter values is proposed. To establish the right values of the ultimate tensile strength flat and curved grips are tested.

Construction and Building Materials, 2015

The paper describes a method of laboratory tests necessary for identifying the mechanical propert... more The paper describes a method of laboratory tests necessary for identifying the mechanical properties of polyester coated fabrics named Precontraint 1202S with PVDF surface treatment. Two sets of initial material parameters for dense net model and orthotropic model are specified. Material parameters for Precontraint 1202S coated fabric are specified on the basis of the biaxial tensile tests for different load ratios. In order to observe a change of initial mechanical properties, the biaxial cyclic tests are carried out. Additionally, a short survey of literature concerning the coated woven fabrics description and numerical simulations is presented. This paper is also proposed as an introduction to the comprehensive investigation of the mechanical properties of coated woven fabrics.

The aim of the present paper is to propose a method of laboratory tests necessary for identificat... more The aim of the present paper is to propose a method of laboratory tests necessary for identification of non-linear elastic properties of the PVC-coated Panama fabric often used for hanging roofs. Two methods of describing the fabric's non-linear behaviour are investigated: piece-wise linear relations between stress and strain are assumed and the Murnaghan model of solid behaviour is applied. The material parameters are specified on the basis of uniaxial constant strain rate tensile tests in the warp and weft directions. Techniques based on the least squares methods are applied in the identification process.

The aim of the present paper is to propose a special kind of finite element procedure for dynamic... more The aim of the present paper is to propose a special kind of finite element procedure for dynamic and static analysis of civil engineering structures (e.g. trusses, beams, shells and spatial structures) including elasto-viscoplastic models. The Chaboche model with damage has been chosen from the wide range of available elasto-viscoplastic constitutive models for numerical calculations. The main advantage of the presented approach is the possibility of interference in subroutines and adjusting them to a particular problem (e.g. altering the form of constitutive equations). A userdefined UVSCPL subroutine has been proposed to introduce the elasto-viscoplastic model into the MSC.Marc system.

The aim of the paper is to propose an FE procedure for static and dynamic nonlinear analysis incl... more The aim of the paper is to propose an FE procedure for static and dynamic nonlinear analysis including elasto-viscoplastic constitutive equations of the Bodner-Partom model. Basic equations of the constitutive model are given with the flow graph used in the FE procedure. The proposed procedure has been applied in the MSC.Marc commercial system with a user-defined UVSCPL subroutine that enables application to a wide range of varied finite elements. A number of simple problems of static and dynamic analysis are presented to show the accuracy of this approach. The numerical simulations are compared with experiments to validate the proposed FE procedure. Keywords: elasto-viscoplastic constitutive model, Bodner-Partom, FEM tq409t-e/461 12 I 2006 BOP s.c., http://www.bop.com.pl 462 A. Ambroziak modified by Rubin and Bodner [7] to model strong non-proportional loading paths such as those experienced in corner turning tests and certain cases of inelastic buckling. A numerical method for the implementation of a micromechanical model capable of predicting the thermomechanical response of laminated metal matrix composites in the presence of damage development with the B-P model was developed by Lissenden and Herakovich [8]. In [9], Mahnken and Stein presented a unified strategy for identification of material parameters of the Chaboche [10], Bodner-Partom [3] and Steck [11] viscoplastic constitutive models from uniaxial tests. Several explicit integration algorithms with self-adaptive time integration strategies was developed and investigated by Arya [12] and applied to the Freed-Verrilli [13] and B-P viscoplastic models. The numerous computations performed showed that, for comparable accuracy, the efficiency of an integration algorithm depends significantly on the type of application. Zhang and Moore [14] used the B-P and the extended Kelvin models to describe the behaviour of high-density polyethylene. Foringer et al. [15] described fatigue life modelling of titanium-based MMCs (metal-matrix composites), on the examples of SCS-6/Timetal21s and SCS-6/Ti-15-3. Sansour and Kollmann [16] considered the theory and numerics of finite inelastic deformations. They employed evolution equations of the Bodner-Partom type with the concept of multiplicative decomposition of the deformation gradient and various numerical examples of finite strain deformations. Kroupa and Bartsch [17] investigated an improved formulation for the viscoplastic response of the Timetalt21S matrix. Their modifications to the Bodner-Partom constitutive equations improved flexibility in fitting a larger strain-rate range than previously available. The material parameters of the isotropic form of the Bodner-Partom model were found as functions of temperature for the eutectic solder by Skipor and Harren [18]. The resulting temperature-dependent viscoplastic description was implemented in an infinitesimal-strain, incrementally-linear finite element method. Sansour and Kollmann [19]

Journal of Materials in Civil Engineering

The paper is focused on the comparison between uniaxial and biaxial laboratory test results for t... more The paper is focused on the comparison between uniaxial and biaxial laboratory test results for the polyester coated fabric. A short literature review concerning coated woven fabrics with emphasis on biaxial tensile tests is presented. A description of the polyester coated fabric under biaxial test by means of constitutive models and material parameter values is proposed. To establish the right values of the ultimate tensile strength flat and curved grips are tested.

The aim of the present paper is to propose a method of laboratory tests to determine non-linear e... more The aim of the present paper is to propose a method of laboratory tests to determine non-linear elastic properties of coated Panama fabric. The material parameters are specified on the basis of uniaxial tensile tests in the warp and weft directions. Techniques based on the least squares' methods are used in the determination process. Reduction concepts of the strength parameters are proposed in order to take into account rheological effects in the fabric. Numerical applications to MSC.Marc, a commercial program, are presented. A user-defined HOOKLW subroutine is used to introduce the non-linear elastic properties of the PVC-coated fabric into the MSC.Marc system.

The hanging structures are the progressive kind of space structures. A great functionality of the... more The hanging structures are the progressive kind of space structures. A great functionality of these constructions consists in possibility of very big surfaces roofing with relatively restricted number of supports. Hanging roofs serves as hall roofs (amphitheatres, sports, exhibitions), also as airports, hangars etc. One of the most important conditions of their calculations is proper determination of changeable in time loads, among them the decisive role plays the wind loading. Wind loads are applied on a structure as the result of complex interaction between wind and the structure itself. This interaction can be classified by aerodynamic and aeroelastic effects . The present paper gives the literature review of the wind loading determining for hanging roofings.

The elasto-viscoplastic constitutive equations of the Chaboche model have been developed and modi... more The elasto-viscoplastic constitutive equations of the Chaboche model have been developed and modified many times. The aim of the present paper is to present the existing Chaboche model variants and describe its scientific and engineering applications. A compact review of literature on these applications is given, focussed on publications offering a wider and more comprehensive view of the elasto-viscoplastic Chaboche model.

This paper describes the numerical aspects of analysis of tensile structures including three prin... more This paper describes the numerical aspects of analysis of tensile structures including three principal types: membranes, cable-nets, pneumatic structures and combination of each other. In the first part, the base division and the survey of the form with examples are given. A brief historical perspective and development has been included too. In the next chapter of the article the problems of design and numerical analysis are presented. In the compact form the authors pay attention to the: shaping and form finding, selection of pretension forces in the initial configuration, the choice of constitutive models, the influence of boundary conditions and dynamic wind loads, the numerical tools of analysis' selection, the cutting pattern. Generally, these kinds of problems are the most common in the design processing of tension roofs. The note covers a summary discussion on these specify aspects with a lot of references to the literature in these interesting and developing branches of civil engineering.

Designing and construction of textile hanging roofs is the challenging subject for engineers. Thi... more Designing and construction of textile hanging roofs is the challenging subject for engineers. This type of structure needs geometrically and very often also physically non-linear calculations. Due to different behaviour of two families of threads (warp and weft), which during deformation can change the angle between their directions, they require special constitutive modelling. Also the loading of hanging roofs is very special. The wind loading should be taken as the following forces, and also its distribution on the roof surface is not unique. Also the snow loading (for permanent structures) can not be usually taken according the national standard. The authors present their experiences with the finite element calculation of hanging roofs at the example of the Forest Opera open area theatre in Sopot (Poland) new designed roofing.

This paper deals with the constitutive modelling and identification of coated woven fabrics prope... more This paper deals with the constitutive modelling and identification of coated woven fabrics properties. The authors give brief characterization of the constitutive models used for the material modelling and discuss in details the fundamental equations of the dense net model. The special identification method of the non-linear elastic properties of the coated fabric is presented. The material parameters are determined on the base of uniaxial tensile tests in the warp and weft directions. For the identification process, techniques using the least squares method are applied. Additionally, the results of the uniaxial tension tests are compared with biaxial tension tests.

Artykuł dotyczy konstrukcji membranowych wykonanych z tkanin technicznych. Autorzy zwracają uwagę... more Artykuł dotyczy konstrukcji membranowych wykonanych z tkanin technicznych. Autorzy zwracają uwagę na procedurę wykonywania testów laboratoryjnych niezbędnych do określenia nieliniowo-sprężystych właściwości tkanin technicznych. Parametry materiałowe wyznaczane są na podstawie testów jednoosiowego rozciągania. W procesie identyfikacji wykorzystano metodę najmniejszych kwadratów. Przedstawiono wyniki identyfikacji dla czterech tkanin technicznych. Omawiany jest także proces obliczeniowy nowoprojektowanego przekrycia Opery Leśnej w Sopocie. This paper describes the membrane structures made from technical woven fabric. The authors pay attention to the method of laboratory tests necessary for identification of non-linear elastic properties of the coated membrane fabrics. The material parameters are specified on the basis of the uniaxial tensile tests in the warp and weft directions. For the identification process the techniques based on the least squares methods are used. Results of iden...

The paper presents an analysis of a membrane-hanging roof subjected to climatic loadings. Discuss... more The paper presents an analysis of a membrane-hanging roof subjected to climatic loadings. Discussion of the fundamental equations of the dense net model, used to describe the behaviour of coated woven fabric, and the concept of the climatic loadings is included.

Journal of Materials in Civil Engineering, 2015

The paper is focused on the comparison between uniaxial and biaxial laboratory test results for t... more The paper is focused on the comparison between uniaxial and biaxial laboratory test results for the polyester coated fabric. A short literature review concerning coated woven fabrics with emphasis on biaxial tensile tests is presented. A description of the polyester coated fabric under biaxial test by means of constitutive models and material parameter values is proposed. To establish the right values of the ultimate tensile strength flat and curved grips are tested.

Construction and Building Materials, 2015

The paper describes a method of laboratory tests necessary for identifying the mechanical propert... more The paper describes a method of laboratory tests necessary for identifying the mechanical properties of polyester coated fabrics named Precontraint 1202S with PVDF surface treatment. Two sets of initial material parameters for dense net model and orthotropic model are specified. Material parameters for Precontraint 1202S coated fabric are specified on the basis of the biaxial tensile tests for different load ratios. In order to observe a change of initial mechanical properties, the biaxial cyclic tests are carried out. Additionally, a short survey of literature concerning the coated woven fabrics description and numerical simulations is presented. This paper is also proposed as an introduction to the comprehensive investigation of the mechanical properties of coated woven fabrics.

The aim of the present paper is to propose a method of laboratory tests necessary for identificat... more The aim of the present paper is to propose a method of laboratory tests necessary for identification of non-linear elastic properties of the PVC-coated Panama fabric often used for hanging roofs. Two methods of describing the fabric's non-linear behaviour are investigated: piece-wise linear relations between stress and strain are assumed and the Murnaghan model of solid behaviour is applied. The material parameters are specified on the basis of uniaxial constant strain rate tensile tests in the warp and weft directions. Techniques based on the least squares methods are applied in the identification process.

The aim of the present paper is to propose a special kind of finite element procedure for dynamic... more The aim of the present paper is to propose a special kind of finite element procedure for dynamic and static analysis of civil engineering structures (e.g. trusses, beams, shells and spatial structures) including elasto-viscoplastic models. The Chaboche model with damage has been chosen from the wide range of available elasto-viscoplastic constitutive models for numerical calculations. The main advantage of the presented approach is the possibility of interference in subroutines and adjusting them to a particular problem (e.g. altering the form of constitutive equations). A userdefined UVSCPL subroutine has been proposed to introduce the elasto-viscoplastic model into the MSC.Marc system.

The aim of the paper is to propose an FE procedure for static and dynamic nonlinear analysis incl... more The aim of the paper is to propose an FE procedure for static and dynamic nonlinear analysis including elasto-viscoplastic constitutive equations of the Bodner-Partom model. Basic equations of the constitutive model are given with the flow graph used in the FE procedure. The proposed procedure has been applied in the MSC.Marc commercial system with a user-defined UVSCPL subroutine that enables application to a wide range of varied finite elements. A number of simple problems of static and dynamic analysis are presented to show the accuracy of this approach. The numerical simulations are compared with experiments to validate the proposed FE procedure. Keywords: elasto-viscoplastic constitutive model, Bodner-Partom, FEM tq409t-e/461 12 I 2006 BOP s.c., http://www.bop.com.pl 462 A. Ambroziak modified by Rubin and Bodner [7] to model strong non-proportional loading paths such as those experienced in corner turning tests and certain cases of inelastic buckling. A numerical method for the implementation of a micromechanical model capable of predicting the thermomechanical response of laminated metal matrix composites in the presence of damage development with the B-P model was developed by Lissenden and Herakovich [8]. In [9], Mahnken and Stein presented a unified strategy for identification of material parameters of the Chaboche [10], Bodner-Partom [3] and Steck [11] viscoplastic constitutive models from uniaxial tests. Several explicit integration algorithms with self-adaptive time integration strategies was developed and investigated by Arya [12] and applied to the Freed-Verrilli [13] and B-P viscoplastic models. The numerous computations performed showed that, for comparable accuracy, the efficiency of an integration algorithm depends significantly on the type of application. Zhang and Moore [14] used the B-P and the extended Kelvin models to describe the behaviour of high-density polyethylene. Foringer et al. [15] described fatigue life modelling of titanium-based MMCs (metal-matrix composites), on the examples of SCS-6/Timetal21s and SCS-6/Ti-15-3. Sansour and Kollmann [16] considered the theory and numerics of finite inelastic deformations. They employed evolution equations of the Bodner-Partom type with the concept of multiplicative decomposition of the deformation gradient and various numerical examples of finite strain deformations. Kroupa and Bartsch [17] investigated an improved formulation for the viscoplastic response of the Timetalt21S matrix. Their modifications to the Bodner-Partom constitutive equations improved flexibility in fitting a larger strain-rate range than previously available. The material parameters of the isotropic form of the Bodner-Partom model were found as functions of temperature for the eutectic solder by Skipor and Harren [18]. The resulting temperature-dependent viscoplastic description was implemented in an infinitesimal-strain, incrementally-linear finite element method. Sansour and Kollmann [19]

Journal of Materials in Civil Engineering

The paper is focused on the comparison between uniaxial and biaxial laboratory test results for t... more The paper is focused on the comparison between uniaxial and biaxial laboratory test results for the polyester coated fabric. A short literature review concerning coated woven fabrics with emphasis on biaxial tensile tests is presented. A description of the polyester coated fabric under biaxial test by means of constitutive models and material parameter values is proposed. To establish the right values of the ultimate tensile strength flat and curved grips are tested.

The aim of the present paper is to propose a method of laboratory tests to determine non-linear e... more The aim of the present paper is to propose a method of laboratory tests to determine non-linear elastic properties of coated Panama fabric. The material parameters are specified on the basis of uniaxial tensile tests in the warp and weft directions. Techniques based on the least squares' methods are used in the determination process. Reduction concepts of the strength parameters are proposed in order to take into account rheological effects in the fabric. Numerical applications to MSC.Marc, a commercial program, are presented. A user-defined HOOKLW subroutine is used to introduce the non-linear elastic properties of the PVC-coated fabric into the MSC.Marc system.

The hanging structures are the progressive kind of space structures. A great functionality of the... more The hanging structures are the progressive kind of space structures. A great functionality of these constructions consists in possibility of very big surfaces roofing with relatively restricted number of supports. Hanging roofs serves as hall roofs (amphitheatres, sports, exhibitions), also as airports, hangars etc. One of the most important conditions of their calculations is proper determination of changeable in time loads, among them the decisive role plays the wind loading. Wind loads are applied on a structure as the result of complex interaction between wind and the structure itself. This interaction can be classified by aerodynamic and aeroelastic effects . The present paper gives the literature review of the wind loading determining for hanging roofings.

The elasto-viscoplastic constitutive equations of the Chaboche model have been developed and modi... more The elasto-viscoplastic constitutive equations of the Chaboche model have been developed and modified many times. The aim of the present paper is to present the existing Chaboche model variants and describe its scientific and engineering applications. A compact review of literature on these applications is given, focussed on publications offering a wider and more comprehensive view of the elasto-viscoplastic Chaboche model.

This paper describes the numerical aspects of analysis of tensile structures including three prin... more This paper describes the numerical aspects of analysis of tensile structures including three principal types: membranes, cable-nets, pneumatic structures and combination of each other. In the first part, the base division and the survey of the form with examples are given. A brief historical perspective and development has been included too. In the next chapter of the article the problems of design and numerical analysis are presented. In the compact form the authors pay attention to the: shaping and form finding, selection of pretension forces in the initial configuration, the choice of constitutive models, the influence of boundary conditions and dynamic wind loads, the numerical tools of analysis' selection, the cutting pattern. Generally, these kinds of problems are the most common in the design processing of tension roofs. The note covers a summary discussion on these specify aspects with a lot of references to the literature in these interesting and developing branches of civil engineering.

Designing and construction of textile hanging roofs is the challenging subject for engineers. Thi... more Designing and construction of textile hanging roofs is the challenging subject for engineers. This type of structure needs geometrically and very often also physically non-linear calculations. Due to different behaviour of two families of threads (warp and weft), which during deformation can change the angle between their directions, they require special constitutive modelling. Also the loading of hanging roofs is very special. The wind loading should be taken as the following forces, and also its distribution on the roof surface is not unique. Also the snow loading (for permanent structures) can not be usually taken according the national standard. The authors present their experiences with the finite element calculation of hanging roofs at the example of the Forest Opera open area theatre in Sopot (Poland) new designed roofing.

This paper deals with the constitutive modelling and identification of coated woven fabrics prope... more This paper deals with the constitutive modelling and identification of coated woven fabrics properties. The authors give brief characterization of the constitutive models used for the material modelling and discuss in details the fundamental equations of the dense net model. The special identification method of the non-linear elastic properties of the coated fabric is presented. The material parameters are determined on the base of uniaxial tensile tests in the warp and weft directions. For the identification process, techniques using the least squares method are applied. Additionally, the results of the uniaxial tension tests are compared with biaxial tension tests.

Artykuł dotyczy konstrukcji membranowych wykonanych z tkanin technicznych. Autorzy zwracają uwagę... more Artykuł dotyczy konstrukcji membranowych wykonanych z tkanin technicznych. Autorzy zwracają uwagę na procedurę wykonywania testów laboratoryjnych niezbędnych do określenia nieliniowo-sprężystych właściwości tkanin technicznych. Parametry materiałowe wyznaczane są na podstawie testów jednoosiowego rozciągania. W procesie identyfikacji wykorzystano metodę najmniejszych kwadratów. Przedstawiono wyniki identyfikacji dla czterech tkanin technicznych. Omawiany jest także proces obliczeniowy nowoprojektowanego przekrycia Opery Leśnej w Sopocie. This paper describes the membrane structures made from technical woven fabric. The authors pay attention to the method of laboratory tests necessary for identification of non-linear elastic properties of the coated membrane fabrics. The material parameters are specified on the basis of the uniaxial tensile tests in the warp and weft directions. For the identification process the techniques based on the least squares methods are used. Results of iden...