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E. Pieczyska

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Ayan Roy Chaudhuri

Indian Institute of Technology Kharagpur

Rutgers, The State University of New Jersey

University of Illinois at Urbana-Champaign

Kummara Venkata Krishnaiah

École Polytechnique de Montréal

CHANDRA S PERUGU

Indian Institute of Science

Susan Trolier-McKinstry

Penn State University

Edward Bormashenko

Ariel University

Heinz-Günter Brokmeier

Clausthal University of Technology

National Tsing Hua University

Cristina Mogosan

University of Medicine and Pharmacy "Iuliu Hatieganu" Cluj-Napoca

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Papers by E. Pieczyska

Nucleation, Development and Healing of Micro-Cracks in Shape Memory Polyurethane Subjected to Subsequent Tension Cycles

Polymers, Jul 6, 2024

Full-Field Deformation Study of Ti-25nb, Ti-25nb-0.3o And Ti-25nb-0.7o Shape Memory Alloys Using Digital Image Correlation

Measurement of temperature during simple dynamic shear

Proceedings of the 2002 International Conference on Quantitative InfraRed Thermography, 2002

This paper presents an application of infrared thermography to investigate the dynamic simple she... more This paper presents an application of infrared thermography to investigate the dynamic simple shear of sheets at high strain rates. The methodology of the simple shear deformation are described. Two methods of temperature measurements on the basis of infrared radiation detection were used in order to satisfy the conditions of dynamic investigation. The temperature accompanying the dynamic simple shear has been evaluated.

Charakterystyki mechaniczne i zmiany temperatury podczas prostego ścinania stali konstrukcyjnych

Mail Inquiry vs Personal Interview the Problem of Reliability and Non Response

SE, 1994

The increase of works in civil engineering in recent years, the security issue to the detriment o... more The increase of works in civil engineering in recent years, the security issue to the detriment of other items, such as financial, became overlooked. But that does not happen, putting users at risk, the Fire Department has as one of its duties indoctrinate on technical standards and act as responsible body on them. To evaluate the effectiveness of the Military Fire Department of Goiás in preventing accidents involving fire and panic in the cities of Goiânia and Aparecida de Goiânia, it was carried out data collection in the archives of the sections of the institution operating in this sector in the region. They were also conducted surveys with all professionals involved in the process of approval and release of the building certificate of conformity. With the collected and compiled data, it was proved the efficiency of service, since even with the increase in population, the increasing vertical integration and the apex of the works of civil engineering, the number of occurrences related to buildings had low growth compared with other evaluated items. Thus it is proven the efficiency of the service and shows how effective and necessary is prevention through the application of technical standards for fire safety and panic.

Monitoring for Non Industrial Private Forestry in Finland

FI, 2000

Sprzężenia termomechaniczne w deformowanej stali austenitycznej

Mechanical Anisotropy of Gum Metal Analyzed by Ultrasonic Measurements and Digital Image Correlation

Experimental investigation of mechanical anisotropy in a multifunctional beta titanium alloy Gum ... more Experimental investigation of mechanical anisotropy in a multifunctional beta titanium alloy Gum Metal under compression is reported. Non-destructive and destructive techniques were used to analyze unique mechanical behavior of the alloy. Structural characterization showed a strong <110> texture of Gum Metal, which is a result of cold-swaging applied during its fabrication [1]. Due to this kind of texture Gum Metal can be treated as transversally isotropic solid. Ultrasonic measurements determined elastic constants with high accuracy. A significant difference between Young’s moduli of the alloy calculated for parallel and perpendicular directions to the alloy swaging direction was demonstrated. Compression of Gum Metal cube samples with two orientations was conducted on a testing machine. Two perpendicular walls of each sample were monitored by two visible range cameras during the deformation process for further 2-dimensional digital image correlation (DIC) analysis. Strong me...

OS16-1-3 Subloop Deformation Behavior of TiNi Shape Memory Alloy under Stress-Controlled Condition

The Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics, 2007

The main characteristics which appear in shape memory alloys (SMAs) are the shape memory effect a... more The main characteristics which appear in shape memory alloys (SMAs) are the shape memory effect and superelasticity. In applications of SMAs, the thermomechanical properties of SMAs are most important. Creep and stress relaxation are induced due to the phase transformation in the subloop loading under the stress-controlled conditions. In order to design the SMA elements properly, it is important to understand the thermomechanical properties. In the present paper, the conditions for the nucleation and progress of the phase transformation in SMAs subjected to the subloop loadings are investigated under the stress-controlled conditions. The transformation-induced creep and stress relaxation and the thermomechanical neutral loading condition are discussed based on the transformation kinetics of the material.

Powder metallurgy technology of NiTi shape memory alloy

The European Physical Journal Special Topics, 2008

Page 1. Eur. Phys. J. Special Topics 158, 5965 (2008) c EDP Sciences, Springer-Verlag 2008 DOI: ... more

Thermomechanical study of cycling, relaxation, and creep sequences in polymers

Proceedings of the 2002 International Conference on Quantitative InfraRed Thermography, 2002

Specially designed experiments were performed to study the thermomechanical aspects of cycling, r... more Specially designed experiments were performed to study the thermomechanical aspects of cycling, relaxation, and creep in polymers. Sheet samples of the material were subjected to a special program of the tensile deformation in a testing machine. An infrared camera was used in order to measure the temperature changes of the sample surface during the deformation. The mechanical and the thermal characteristics were obtained both in elastic and plastic ranges of straining, as well as after the process.

OS08-2-2 Thermomechanical behavior of TiNi shape memory alloy during superelastic shear deformation

The Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics

Infrared imaging of TiNi shape memory alloy subjected to deformation at

The infrared imaging of stress-induced martensitic transformation occurring in TiNi shape memory ... more The infrared imaging of stress-induced martensitic transformation occurring in TiNi shape memory alloy subjected to deformation in various conditions has been presented. During the loading and unloading processes the mechanical parameters and the infrared radiation from the specimen surface have been continuously recorded by infrared camera. Basing on the obtained stress-strain curves and the elaborated temperature changes it was found that onset of the martensitic transformation appears at the end of the elastic part of the stress-strain curve, since a temperature increase was noticed there. The uniform temperature distribution observed there means that the initial transformation started at this stage is macroscopically homogeneous. It is followed by the martensitic intense transformation, related to the significant temperature increase. The more advanced transformation, the higher temperature changes. For the shape memory alloy pseudoelastic behavior the narrow bands of higher temperature are observed, manifesting localized Lüders-like deformation. For the shape memory effect behavior the process of transformation is much more homogeneous and characterized by uniform temperature distribution. Using a modern, sensitive and fast dynamic infrared camera enables to obtain new results of the start and development of the martensite forward and reverse transformation.

Thermomechanical investigation of martensite and reverse transformation in TiNi shape memory alloy

Abstract. Shape memory alloys are characterised by interesting properties, i.e. shape memory effe... more Abstract. Shape memory alloys are characterised by interesting properties, i.e. shape memory effect and pseudoelasticity, which enable their increasing application. Thermomechanical aspects of martensitic and reverse transformations in TiNi shape memory alloy subjected to tension tests were investigated. The stress-strain characteristics obtained during the tests were completed by the temperature characteristics. The tem-perature changes were calculated on the basis of thermograms determined by an infrared camera. Taking advantages from the infrared technique, the temperature distributions on the specimen’s surface were found. Heterogeneous temperature distributions, related to the nucleation and development of the new martensite phase, were registered and analysed. A significant temperature increase, up to 30 K, was registered during the martensitic transformation. The similar effects of the heterogeneous temperature distribution were observed during unloading, while the reverse tr...

SMA Thin Strip for Rotary-Driving Element

Abstract. If a shape-memory alloy (SMA) thin strip is applied as an element subjected to torsion,... more Abstract. If a shape-memory alloy (SMA) thin strip is applied as an element subjected to torsion, a rotary driving element with a simple mechanism can be developed. The torsion tests were carried out for the SMA thin strip. Torque and recovery torque, both increase in proportion to the angle of twist and temperature. The recoverable strain energy increases in proportion to temperature. The dissipated work decreases slightly with an increase in temperature. A means of opening and closing a door with an element driven by an SMA thin strip is demonstrated.

2002c, Thermomechanical study of cycling, relaxation and creep sequences in polymers

Specially designed experiments were performed to study the thermomechanical aspects of cycling, r... more Specially designed experiments were performed to study the thermomechanical aspects of cycling, relaxation, and creep in polymers. Sheet samples of the material were subjected to a special program of the tensile deformation in a testing machine. An infrared camera was used in order to measure the temperature changes of the sample surface during the deformation. The mechanical and the thermal characteristics were obtained both in elastic and plastic ranges of straining, as well as after the process.

TEMPERATURE ASSESSMENT OF TiNi SHAPE MEMORY ALLOY SUBJECTED TO COMPRESSION AT QUASISTATIC AND DYNAMIC STRAIN RATES

This work compares the thermomechanical behavior of TiNi shape memory alloy subjected to the comp... more This work compares the thermomechanical behavior of TiNi shape memory alloy subjected to the compression test performed under various strain rates. The mechanical characteristics of the material were elaborated. The specimen temperature changes related to the exothermic martensitic forward and endothermic reverse transformation were measured in a contact-less manner by a very fast and sensitive infrared camera. It has been found that in this experimental conditions the stress-induced transformation and reorientation processes occurred homogeneously, since the temperature distribution observed on the specimen surface was uniform. The obtained temperature variation depends on the strain rate applied. At the higher strain rate the higher temperature changes were obtained, because the heat flow to the surroundings was lower and the process was closer to adiabatic conditions. The temperature changes influence significantly the SMA stress-strain curves and their mechanical properties.

Analiza doświadczalna własciwości termomechanicznych stopów TiNi oraz poliuretanu z pamięcią ksztaltu

Stress-Induced Martensite Transformation in TiNi SMA - Experimental Estimation of Energy Balance

The last part of the equation, called piezocalorimetric effect, is neglected in the analysis, sin... more The last part of the equation, called piezocalorimetric effect, is neglected in the analysis, since its value is not significant. For example, for 39K, recorded for the highest strain rate 10s , is as follows:-10x10/K x 312K x 800MPa/ 6.45g/cm =0.38 [J/g]. So as average contribution, 0.19 [J/g]. Parameters of the martensite transformation; S S M A M c , , , γ were identified from tension test carried out on the TiNi shape memory alloy at three various temperatures with very low strain rate. As a result, it was found: 07 . 0 , 282 , 228 , / 62 . 5 = = = = γ K A K M K MPa c S S M . The value of

Gum Metal—unique properties and results of initial investigation of a new titanium alloy—extended paper

Initial results of effects of thermomechanical couplings in the β-Ti alloy, Gum Metal, subjected ... more Initial results of effects of thermomechanical couplings in the β-Ti alloy, Gum Metal, subjected to tension are presented. An MTS testing machine allows obtaining stress-strain curves with high accuracy, while fast and sensitive infrared camera allows estimating temperature changes of the sample during the deformation process. The obtained mechanical characteristics confirm an ultra-low elastic modulus and high strength of the Gum Metal. The infrared measurements enable to indicate average or maximum temperature change accompanying the alloy deformation process, to estimate thermoelastic effect, related to the yield point in solids, whereas the temperature distribution on the sample surface enables to investigate localisation effects, leading to the sample necking and rupture.

Nucleation, Development and Healing of Micro-Cracks in Shape Memory Polyurethane Subjected to Subsequent Tension Cycles

Polymers, Jul 6, 2024

Full-Field Deformation Study of Ti-25nb, Ti-25nb-0.3o And Ti-25nb-0.7o Shape Memory Alloys Using Digital Image Correlation

Measurement of temperature during simple dynamic shear

Proceedings of the 2002 International Conference on Quantitative InfraRed Thermography, 2002

This paper presents an application of infrared thermography to investigate the dynamic simple she... more This paper presents an application of infrared thermography to investigate the dynamic simple shear of sheets at high strain rates. The methodology of the simple shear deformation are described. Two methods of temperature measurements on the basis of infrared radiation detection were used in order to satisfy the conditions of dynamic investigation. The temperature accompanying the dynamic simple shear has been evaluated.

Charakterystyki mechaniczne i zmiany temperatury podczas prostego ścinania stali konstrukcyjnych

Mail Inquiry vs Personal Interview the Problem of Reliability and Non Response

SE, 1994

The increase of works in civil engineering in recent years, the security issue to the detriment o... more The increase of works in civil engineering in recent years, the security issue to the detriment of other items, such as financial, became overlooked. But that does not happen, putting users at risk, the Fire Department has as one of its duties indoctrinate on technical standards and act as responsible body on them. To evaluate the effectiveness of the Military Fire Department of Goiás in preventing accidents involving fire and panic in the cities of Goiânia and Aparecida de Goiânia, it was carried out data collection in the archives of the sections of the institution operating in this sector in the region. They were also conducted surveys with all professionals involved in the process of approval and release of the building certificate of conformity. With the collected and compiled data, it was proved the efficiency of service, since even with the increase in population, the increasing vertical integration and the apex of the works of civil engineering, the number of occurrences related to buildings had low growth compared with other evaluated items. Thus it is proven the efficiency of the service and shows how effective and necessary is prevention through the application of technical standards for fire safety and panic.

Monitoring for Non Industrial Private Forestry in Finland

FI, 2000

Sprzężenia termomechaniczne w deformowanej stali austenitycznej

Mechanical Anisotropy of Gum Metal Analyzed by Ultrasonic Measurements and Digital Image Correlation

Experimental investigation of mechanical anisotropy in a multifunctional beta titanium alloy Gum ... more Experimental investigation of mechanical anisotropy in a multifunctional beta titanium alloy Gum Metal under compression is reported. Non-destructive and destructive techniques were used to analyze unique mechanical behavior of the alloy. Structural characterization showed a strong <110> texture of Gum Metal, which is a result of cold-swaging applied during its fabrication [1]. Due to this kind of texture Gum Metal can be treated as transversally isotropic solid. Ultrasonic measurements determined elastic constants with high accuracy. A significant difference between Young’s moduli of the alloy calculated for parallel and perpendicular directions to the alloy swaging direction was demonstrated. Compression of Gum Metal cube samples with two orientations was conducted on a testing machine. Two perpendicular walls of each sample were monitored by two visible range cameras during the deformation process for further 2-dimensional digital image correlation (DIC) analysis. Strong me...

OS16-1-3 Subloop Deformation Behavior of TiNi Shape Memory Alloy under Stress-Controlled Condition

The Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics, 2007

The main characteristics which appear in shape memory alloys (SMAs) are the shape memory effect a... more The main characteristics which appear in shape memory alloys (SMAs) are the shape memory effect and superelasticity. In applications of SMAs, the thermomechanical properties of SMAs are most important. Creep and stress relaxation are induced due to the phase transformation in the subloop loading under the stress-controlled conditions. In order to design the SMA elements properly, it is important to understand the thermomechanical properties. In the present paper, the conditions for the nucleation and progress of the phase transformation in SMAs subjected to the subloop loadings are investigated under the stress-controlled conditions. The transformation-induced creep and stress relaxation and the thermomechanical neutral loading condition are discussed based on the transformation kinetics of the material.

Powder metallurgy technology of NiTi shape memory alloy

The European Physical Journal Special Topics, 2008

Page 1. Eur. Phys. J. Special Topics 158, 5965 (2008) c EDP Sciences, Springer-Verlag 2008 DOI: ... more

Thermomechanical study of cycling, relaxation, and creep sequences in polymers

Proceedings of the 2002 International Conference on Quantitative InfraRed Thermography, 2002

Specially designed experiments were performed to study the thermomechanical aspects of cycling, r... more Specially designed experiments were performed to study the thermomechanical aspects of cycling, relaxation, and creep in polymers. Sheet samples of the material were subjected to a special program of the tensile deformation in a testing machine. An infrared camera was used in order to measure the temperature changes of the sample surface during the deformation. The mechanical and the thermal characteristics were obtained both in elastic and plastic ranges of straining, as well as after the process.

OS08-2-2 Thermomechanical behavior of TiNi shape memory alloy during superelastic shear deformation

The Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics

Infrared imaging of TiNi shape memory alloy subjected to deformation at

The infrared imaging of stress-induced martensitic transformation occurring in TiNi shape memory ... more The infrared imaging of stress-induced martensitic transformation occurring in TiNi shape memory alloy subjected to deformation in various conditions has been presented. During the loading and unloading processes the mechanical parameters and the infrared radiation from the specimen surface have been continuously recorded by infrared camera. Basing on the obtained stress-strain curves and the elaborated temperature changes it was found that onset of the martensitic transformation appears at the end of the elastic part of the stress-strain curve, since a temperature increase was noticed there. The uniform temperature distribution observed there means that the initial transformation started at this stage is macroscopically homogeneous. It is followed by the martensitic intense transformation, related to the significant temperature increase. The more advanced transformation, the higher temperature changes. For the shape memory alloy pseudoelastic behavior the narrow bands of higher temperature are observed, manifesting localized Lüders-like deformation. For the shape memory effect behavior the process of transformation is much more homogeneous and characterized by uniform temperature distribution. Using a modern, sensitive and fast dynamic infrared camera enables to obtain new results of the start and development of the martensite forward and reverse transformation.

Thermomechanical investigation of martensite and reverse transformation in TiNi shape memory alloy

Abstract. Shape memory alloys are characterised by interesting properties, i.e. shape memory effe... more Abstract. Shape memory alloys are characterised by interesting properties, i.e. shape memory effect and pseudoelasticity, which enable their increasing application. Thermomechanical aspects of martensitic and reverse transformations in TiNi shape memory alloy subjected to tension tests were investigated. The stress-strain characteristics obtained during the tests were completed by the temperature characteristics. The tem-perature changes were calculated on the basis of thermograms determined by an infrared camera. Taking advantages from the infrared technique, the temperature distributions on the specimen’s surface were found. Heterogeneous temperature distributions, related to the nucleation and development of the new martensite phase, were registered and analysed. A significant temperature increase, up to 30 K, was registered during the martensitic transformation. The similar effects of the heterogeneous temperature distribution were observed during unloading, while the reverse tr...

SMA Thin Strip for Rotary-Driving Element

Abstract. If a shape-memory alloy (SMA) thin strip is applied as an element subjected to torsion,... more Abstract. If a shape-memory alloy (SMA) thin strip is applied as an element subjected to torsion, a rotary driving element with a simple mechanism can be developed. The torsion tests were carried out for the SMA thin strip. Torque and recovery torque, both increase in proportion to the angle of twist and temperature. The recoverable strain energy increases in proportion to temperature. The dissipated work decreases slightly with an increase in temperature. A means of opening and closing a door with an element driven by an SMA thin strip is demonstrated.

2002c, Thermomechanical study of cycling, relaxation and creep sequences in polymers

Specially designed experiments were performed to study the thermomechanical aspects of cycling, r... more Specially designed experiments were performed to study the thermomechanical aspects of cycling, relaxation, and creep in polymers. Sheet samples of the material were subjected to a special program of the tensile deformation in a testing machine. An infrared camera was used in order to measure the temperature changes of the sample surface during the deformation. The mechanical and the thermal characteristics were obtained both in elastic and plastic ranges of straining, as well as after the process.

TEMPERATURE ASSESSMENT OF TiNi SHAPE MEMORY ALLOY SUBJECTED TO COMPRESSION AT QUASISTATIC AND DYNAMIC STRAIN RATES

This work compares the thermomechanical behavior of TiNi shape memory alloy subjected to the comp... more This work compares the thermomechanical behavior of TiNi shape memory alloy subjected to the compression test performed under various strain rates. The mechanical characteristics of the material were elaborated. The specimen temperature changes related to the exothermic martensitic forward and endothermic reverse transformation were measured in a contact-less manner by a very fast and sensitive infrared camera. It has been found that in this experimental conditions the stress-induced transformation and reorientation processes occurred homogeneously, since the temperature distribution observed on the specimen surface was uniform. The obtained temperature variation depends on the strain rate applied. At the higher strain rate the higher temperature changes were obtained, because the heat flow to the surroundings was lower and the process was closer to adiabatic conditions. The temperature changes influence significantly the SMA stress-strain curves and their mechanical properties.

Analiza doświadczalna własciwości termomechanicznych stopów TiNi oraz poliuretanu z pamięcią ksztaltu

Stress-Induced Martensite Transformation in TiNi SMA - Experimental Estimation of Energy Balance

The last part of the equation, called piezocalorimetric effect, is neglected in the analysis, sin... more The last part of the equation, called piezocalorimetric effect, is neglected in the analysis, since its value is not significant. For example, for 39K, recorded for the highest strain rate 10s , is as follows:-10x10/K x 312K x 800MPa/ 6.45g/cm =0.38 [J/g]. So as average contribution, 0.19 [J/g]. Parameters of the martensite transformation; S S M A M c , , , γ were identified from tension test carried out on the TiNi shape memory alloy at three various temperatures with very low strain rate. As a result, it was found: 07 . 0 , 282 , 228 , / 62 . 5 = = = = γ K A K M K MPa c S S M . The value of

Gum Metal—unique properties and results of initial investigation of a new titanium alloy—extended paper

Initial results of effects of thermomechanical couplings in the β-Ti alloy, Gum Metal, subjected ... more Initial results of effects of thermomechanical couplings in the β-Ti alloy, Gum Metal, subjected to tension are presented. An MTS testing machine allows obtaining stress-strain curves with high accuracy, while fast and sensitive infrared camera allows estimating temperature changes of the sample during the deformation process. The obtained mechanical characteristics confirm an ultra-low elastic modulus and high strength of the Gum Metal. The infrared measurements enable to indicate average or maximum temperature change accompanying the alloy deformation process, to estimate thermoelastic effect, related to the yield point in solids, whereas the temperature distribution on the sample surface enables to investigate localisation effects, leading to the sample necking and rupture.