Aleksander Karolczuk - Academia.edu (original) (raw)

Uploads

Papers by Aleksander Karolczuk

Research paper thumbnail of S2.0 S0142112323002773 main

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Wpływ obróbki cieplnej na wartość naprężeń resztkowych w bimetalu stal-tytan wyznaczonych metodą nawiercania

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Analysis of the fatigue life of metal composites with a layer of zirconium alloy

MATEC Web of Conferences, 2021

Methods of joining dissimilar materials gain interest and attention of highly demanding branches ... more Methods of joining dissimilar materials gain interest and attention of highly demanding branches of modern engineering. Acquiring high-quality bond between steel and titanium or zirconium alloys is perceived as especially advantageous in terms of high strength and corrosion resistance. In the present paper results of fatigue tests performed on five different metal composites produced in the process of explosive welding has been gathered. All tested materials were manufactured by a collision of zirconium flyer plates with base plates made of steel or steel-titanium bimetal. Fatigue tests have been conducted under uniaxial force-controlled tension-compression conditions with a constant amplitude of load applied parallelly to bonding interface. The analysis includes the residual stresses measured by the hole-drilling strain gauge method in the flyer plates and the applied stresses calculated by three different models. A description of the initiation and propagation of cracks developing...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Estimation of fatigue life under uniaxial random loading with zero and non-zero mean value by means of the strain energy density parameter

Archive of Mechanical Engineering, 2006

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Trwałość zmęczeniowa stali 18G2A przy cyklicznym i losowym nieproporcjonalnym zginaniu ze skręcaniem w ujęciu nielokalnym

Systems: Journal of Transdisciplinary Systems Science, 2003

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fatigue Life Assessment of Structural Component with a Non-uniform Stress Distribution Based on a Probabilistic Approach

A probabilistic approach is developed to take into account the stress gradient effect on fatigue ... more A probabilistic approach is developed to take into account the stress gradient effect on fatigue life for structural metallic component. This approach is based on the weakest link concept that determines, for a given lifetime, the probability distribution of the fatigue strength. The new concept determines the probability that the fatigue life N will be smaller than a specific fatigue life Ni. This new concept allows calculating fatigue life and its scatter for any arbitrary loading level. A Weibull type probability distribution is used in the proposal, its parameters become functions of local equivalent stresses whatever the stress level. The proposed approach was applied to calculate the number of cycles to crack initiation for a failure probability of 5%, 63% and 95%. The calculated lifetimes were compared with lifetimes obtained from experiments carried out on notched cruciform and round specimens, made of two different steels, under constant amplitude loading. Introduction Effe...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nielokalne metody obliczeń zmęczeniowych

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Identification of elliptic rotors based on image analysis

ABSTRACT The paper presents the subsequent steps of the digital image analysis of the tooth ellip... more ABSTRACT The paper presents the subsequent steps of the digital image analysis of the tooth elliptic rotor. The tooth elliptic rotors are main parts of the designed transmission with variable ratio. The geometric properties of the rotors are very important for proper functioning of the transmission and should be measured. The performed image analysis allows measurement of geometric features which are non-measurable, in reasonable time, by other techniques. Special attention is paid to error measurement assessment. The obtained results show that in spite of measurement problems some geometric features were verified.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fatigue failure analysis of three-layer Zr–Ti/Zr–Steel composite plates: an insight into the evolution of cracks initiated at the interfaces

Initiation and evolution of fatigue cracks at the interfaces in three-layer Zr–Ti/Zr–Steel compos... more Initiation and evolution of fatigue cracks at the interfaces in three-layer Zr–Ti/Zr–Steel composites is herein examined by in situ optical microscopy for the first time. Specimens cut out from three composite plates comprising Zr 700, Ti Gr. 1, and P265GH steel layers have been subjected to uniaxial fatigue cyclic loading. It is found that mechanical property mismatch between layers and defects at the interfaces can reduce the fatigue life of composite plates. An insight into the evolution of cracks initiated at the interfaces reveals that (1) most of the cracks grow into adjacent layers along two distinct planes, and (2) these cracks could lead to the fatigue failure of composites. One of these planes coincides with the adiabatic shear band orientation found in Ti Gr. 1 and Zr 700 layers. The interfaces in multilayer metallic composite could have excellent fatigue strength depending on their structural properties.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Validating the Methods to Process the Stress Path in Multiaxial High-Cycle Fatigue Criteria

Materials

The paper discusses one of the key features in the multiaxial fatigue strength evaluation—the pro... more The paper discusses one of the key features in the multiaxial fatigue strength evaluation—the procedure in which the stress path is analyzed to provide relevant measures of parameters required by multiaxial criteria. The selection of this procedure affects the complete equivalent stress derived for any multiaxial load combinations. Three major concepts—the minimum circumscribed circle, minimum circumscribed ellipse, and moment of inertia methods—are described. Analytical solutions of their evaluation for multiaxial stress state with components described by harmonic functions are provided. The concepts are validated on available experimental data when included into six different multiaxial fatigue strength criteria. The results show that the moment of inertia results in too conservative results. Differences between both methods of circumscribed entities are much smaller. There are indications however that the minimum circumscribed ellipse solution works better for critical plane crit...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fatigue failure probability estimation of the 7075-T651 aluminum alloy under multiaxial loading based on the life-dependent material parameters concept

International Journal of Fatigue

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Validation of the weakest link approach and the proposed Weibull based probability distribution of failure for fatigue design of steel welded joints

Engineering Failure Analysis

Abstract The paper describes validation process of a proposed application of the weakest link con... more Abstract The paper describes validation process of a proposed application of the weakest link concept to fatigue life evaluation of steel welded joints. The weakest link concept was used to evaluate failure probability and the resulting fatigue lives of typical welded joints under the constant amplitude uniaxial loading. The validation of this approach involved comparison between the modeling results and experimental results. Investigation concerned butt- and double T-joints manufactured from three steel grades, the latter of which being of two thicknesses. Two assumptions for the approach have been tested: (i) applicability to joints of different geometry and (ii) ability to predict the effect of decreased fatigue life in joints with higher plate thickness. The results revealed appreciable effect of geometry on cumulative distribution function of failure, changing the kurtosis of failure distribution.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application of the Gaussian process for fatigue life prediction under multiaxial loading

Mechanical Systems and Signal Processing, 2022

Fatigue life prediction with failure probability estimation for materials subjected to multiaxial... more Fatigue life prediction with failure probability estimation for materials subjected to multiaxial loading is an important task in engineering design because it reduces the financial cost by eliminating expensive experimental tests. Owing to the complex deterioration mechanisms of fatigue failure, existing fatigue life prediction models are of the empirical or semi-empirical type, and their applicability is limited to validating the loading condition and material. Improper selection of the fatigue model could result in non-conservative life prediction with high financial and catastrophic consequences. To solve this problem, an innovative approach based on the Gaussian process for fatigue life prediction under multiaxial loading is presented. The inherent features of the Gaussian process predispose its application to fatigue life prediction under multiaxial loading as an efficient and practical approach to avoid the problem in selecting adequate semi-empirical parametric fatigue models. The model was validated on two sets of experimental data obtained by fatigue testing of S355N steel and 2124 T851 aluminum alloy under uniaxial and multiaxial loadings. In the model training process, only data obtained under uniaxial and pure torsion cyclic loadings were applied. Owing to the implemented physics-based input data, which are related to the stress components acting on the critical plane of crack initiation, the model accurately predicted the fatigue lives of the two tested materials by implementing the squared exponential covariance function. In addition, the fatigue lives were also computed using four parametric fatigue strength criteria (Crossland, Matake, Carpinteri et al., and Papuga-Růžička models). The best results obtained by the parametric models exhibited a lower fatigue prediction performance than the results using the Gaussian process-based model.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Influence of Impact Velocity on the Residual Stress, Tensile Strength, and Structural Properties of an Explosively Welded Composite Plate

Materials

This study aimed to analyze the effect of the impact velocity of a Zr 700 flyer plate explosively... more This study aimed to analyze the effect of the impact velocity of a Zr 700 flyer plate explosively welded to a Ti Gr. 1/P265GH bimetallic composite on the residual stress formation, structural properties, and tensile strength. The residual stresses were determined by the orbital hole-drilling strain-gauge method in a surface layer of Zr 700 in as-received and as-welded conditions. The analysis of the tensile test results based on a force parallel to interfaces was used to propose a model for predicting the yield force of composite plates. Compressive residual stresses found in the initial state of the Zr 700 plate were transformed to tensile stresses on the surface layer of the welded Zr 700 plate. A higher impact velocity resulted in higher tensile stresses in the Zr 700 surface layer. To increase the resistance of the composite plate to stress-based corrosion cracking, a lower value of impact velocity is recommended in the welding process.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application of life-dependent material parameters to lifetime calculation under multiaxial constant- and variable-amplitude loading

International Journal of Fatigue

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Validation of multiaxial fatigue criteria application to lifetime calculation of S355 steel under cyclic bending-torsion loading

Procedia Structural Integrity

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application of Life-Dependent Material Parameters to Fatigue Life Prediction under Multiaxial and Non-Zero Mean Loading

Materials

This study presents the life-dependent material parameters concept as applied to several well-kno... more This study presents the life-dependent material parameters concept as applied to several well-known fatigue models for the purpose of life prediction under multiaxial and non-zero mean loading. The necessity of replacing the fixed material parameters with life-dependent parameters is demonstrated. The aim of the research here is verification of the life-dependent material parameters concept when applied to multiaxial fatigue loading with non-zero mean stress. The verification is performed with new experimental fatigue test results on a 7075-T651 aluminium alloy and S355 steel subjected to multiaxial cyclic bending and torsion loading under stress ratios equal to R = −0.5 and 0.0, respectively. The received results exhibit the significant effect of the non-zero mean value of shear stress on the fatigue life of S355 steel. The prediction of fatigue life was improved when using the life-dependent material parameters compared to the fixed material parameters.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Progress in fatigue life calculation by implementing life-dependent material parameters in multiaxial fatigue criteria

International Journal of Fatigue

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Rozkład naprężeń w krzyżowym złączu spawanym z uwzględnieniem rzeczywistego kształtu spoiny

Przegląd Spawalnictwa - Welding Technology Review

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Porównanie energetycznego modelu wyznaczania trwałości zmęczeniowej złączy spawanych z zaleceniami międzynarodowymi

Przegląd Spawalnictwa - Welding Technology Review

Bookmarks Related papers MentionsView impact

Research paper thumbnail of S2.0 S0142112323002773 main

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Wpływ obróbki cieplnej na wartość naprężeń resztkowych w bimetalu stal-tytan wyznaczonych metodą nawiercania

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Analysis of the fatigue life of metal composites with a layer of zirconium alloy

MATEC Web of Conferences, 2021

Methods of joining dissimilar materials gain interest and attention of highly demanding branches ... more Methods of joining dissimilar materials gain interest and attention of highly demanding branches of modern engineering. Acquiring high-quality bond between steel and titanium or zirconium alloys is perceived as especially advantageous in terms of high strength and corrosion resistance. In the present paper results of fatigue tests performed on five different metal composites produced in the process of explosive welding has been gathered. All tested materials were manufactured by a collision of zirconium flyer plates with base plates made of steel or steel-titanium bimetal. Fatigue tests have been conducted under uniaxial force-controlled tension-compression conditions with a constant amplitude of load applied parallelly to bonding interface. The analysis includes the residual stresses measured by the hole-drilling strain gauge method in the flyer plates and the applied stresses calculated by three different models. A description of the initiation and propagation of cracks developing...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Estimation of fatigue life under uniaxial random loading with zero and non-zero mean value by means of the strain energy density parameter

Archive of Mechanical Engineering, 2006

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Trwałość zmęczeniowa stali 18G2A przy cyklicznym i losowym nieproporcjonalnym zginaniu ze skręcaniem w ujęciu nielokalnym

Systems: Journal of Transdisciplinary Systems Science, 2003

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fatigue Life Assessment of Structural Component with a Non-uniform Stress Distribution Based on a Probabilistic Approach

A probabilistic approach is developed to take into account the stress gradient effect on fatigue ... more A probabilistic approach is developed to take into account the stress gradient effect on fatigue life for structural metallic component. This approach is based on the weakest link concept that determines, for a given lifetime, the probability distribution of the fatigue strength. The new concept determines the probability that the fatigue life N will be smaller than a specific fatigue life Ni. This new concept allows calculating fatigue life and its scatter for any arbitrary loading level. A Weibull type probability distribution is used in the proposal, its parameters become functions of local equivalent stresses whatever the stress level. The proposed approach was applied to calculate the number of cycles to crack initiation for a failure probability of 5%, 63% and 95%. The calculated lifetimes were compared with lifetimes obtained from experiments carried out on notched cruciform and round specimens, made of two different steels, under constant amplitude loading. Introduction Effe...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nielokalne metody obliczeń zmęczeniowych

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Identification of elliptic rotors based on image analysis

ABSTRACT The paper presents the subsequent steps of the digital image analysis of the tooth ellip... more ABSTRACT The paper presents the subsequent steps of the digital image analysis of the tooth elliptic rotor. The tooth elliptic rotors are main parts of the designed transmission with variable ratio. The geometric properties of the rotors are very important for proper functioning of the transmission and should be measured. The performed image analysis allows measurement of geometric features which are non-measurable, in reasonable time, by other techniques. Special attention is paid to error measurement assessment. The obtained results show that in spite of measurement problems some geometric features were verified.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fatigue failure analysis of three-layer Zr–Ti/Zr–Steel composite plates: an insight into the evolution of cracks initiated at the interfaces

Initiation and evolution of fatigue cracks at the interfaces in three-layer Zr–Ti/Zr–Steel compos... more Initiation and evolution of fatigue cracks at the interfaces in three-layer Zr–Ti/Zr–Steel composites is herein examined by in situ optical microscopy for the first time. Specimens cut out from three composite plates comprising Zr 700, Ti Gr. 1, and P265GH steel layers have been subjected to uniaxial fatigue cyclic loading. It is found that mechanical property mismatch between layers and defects at the interfaces can reduce the fatigue life of composite plates. An insight into the evolution of cracks initiated at the interfaces reveals that (1) most of the cracks grow into adjacent layers along two distinct planes, and (2) these cracks could lead to the fatigue failure of composites. One of these planes coincides with the adiabatic shear band orientation found in Ti Gr. 1 and Zr 700 layers. The interfaces in multilayer metallic composite could have excellent fatigue strength depending on their structural properties.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Validating the Methods to Process the Stress Path in Multiaxial High-Cycle Fatigue Criteria

Materials

The paper discusses one of the key features in the multiaxial fatigue strength evaluation—the pro... more The paper discusses one of the key features in the multiaxial fatigue strength evaluation—the procedure in which the stress path is analyzed to provide relevant measures of parameters required by multiaxial criteria. The selection of this procedure affects the complete equivalent stress derived for any multiaxial load combinations. Three major concepts—the minimum circumscribed circle, minimum circumscribed ellipse, and moment of inertia methods—are described. Analytical solutions of their evaluation for multiaxial stress state with components described by harmonic functions are provided. The concepts are validated on available experimental data when included into six different multiaxial fatigue strength criteria. The results show that the moment of inertia results in too conservative results. Differences between both methods of circumscribed entities are much smaller. There are indications however that the minimum circumscribed ellipse solution works better for critical plane crit...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fatigue failure probability estimation of the 7075-T651 aluminum alloy under multiaxial loading based on the life-dependent material parameters concept

International Journal of Fatigue

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Validation of the weakest link approach and the proposed Weibull based probability distribution of failure for fatigue design of steel welded joints

Engineering Failure Analysis

Abstract The paper describes validation process of a proposed application of the weakest link con... more Abstract The paper describes validation process of a proposed application of the weakest link concept to fatigue life evaluation of steel welded joints. The weakest link concept was used to evaluate failure probability and the resulting fatigue lives of typical welded joints under the constant amplitude uniaxial loading. The validation of this approach involved comparison between the modeling results and experimental results. Investigation concerned butt- and double T-joints manufactured from three steel grades, the latter of which being of two thicknesses. Two assumptions for the approach have been tested: (i) applicability to joints of different geometry and (ii) ability to predict the effect of decreased fatigue life in joints with higher plate thickness. The results revealed appreciable effect of geometry on cumulative distribution function of failure, changing the kurtosis of failure distribution.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application of the Gaussian process for fatigue life prediction under multiaxial loading

Mechanical Systems and Signal Processing, 2022

Fatigue life prediction with failure probability estimation for materials subjected to multiaxial... more Fatigue life prediction with failure probability estimation for materials subjected to multiaxial loading is an important task in engineering design because it reduces the financial cost by eliminating expensive experimental tests. Owing to the complex deterioration mechanisms of fatigue failure, existing fatigue life prediction models are of the empirical or semi-empirical type, and their applicability is limited to validating the loading condition and material. Improper selection of the fatigue model could result in non-conservative life prediction with high financial and catastrophic consequences. To solve this problem, an innovative approach based on the Gaussian process for fatigue life prediction under multiaxial loading is presented. The inherent features of the Gaussian process predispose its application to fatigue life prediction under multiaxial loading as an efficient and practical approach to avoid the problem in selecting adequate semi-empirical parametric fatigue models. The model was validated on two sets of experimental data obtained by fatigue testing of S355N steel and 2124 T851 aluminum alloy under uniaxial and multiaxial loadings. In the model training process, only data obtained under uniaxial and pure torsion cyclic loadings were applied. Owing to the implemented physics-based input data, which are related to the stress components acting on the critical plane of crack initiation, the model accurately predicted the fatigue lives of the two tested materials by implementing the squared exponential covariance function. In addition, the fatigue lives were also computed using four parametric fatigue strength criteria (Crossland, Matake, Carpinteri et al., and Papuga-Růžička models). The best results obtained by the parametric models exhibited a lower fatigue prediction performance than the results using the Gaussian process-based model.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Influence of Impact Velocity on the Residual Stress, Tensile Strength, and Structural Properties of an Explosively Welded Composite Plate

Materials

This study aimed to analyze the effect of the impact velocity of a Zr 700 flyer plate explosively... more This study aimed to analyze the effect of the impact velocity of a Zr 700 flyer plate explosively welded to a Ti Gr. 1/P265GH bimetallic composite on the residual stress formation, structural properties, and tensile strength. The residual stresses were determined by the orbital hole-drilling strain-gauge method in a surface layer of Zr 700 in as-received and as-welded conditions. The analysis of the tensile test results based on a force parallel to interfaces was used to propose a model for predicting the yield force of composite plates. Compressive residual stresses found in the initial state of the Zr 700 plate were transformed to tensile stresses on the surface layer of the welded Zr 700 plate. A higher impact velocity resulted in higher tensile stresses in the Zr 700 surface layer. To increase the resistance of the composite plate to stress-based corrosion cracking, a lower value of impact velocity is recommended in the welding process.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application of life-dependent material parameters to lifetime calculation under multiaxial constant- and variable-amplitude loading

International Journal of Fatigue

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Validation of multiaxial fatigue criteria application to lifetime calculation of S355 steel under cyclic bending-torsion loading

Procedia Structural Integrity

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application of Life-Dependent Material Parameters to Fatigue Life Prediction under Multiaxial and Non-Zero Mean Loading

Materials

This study presents the life-dependent material parameters concept as applied to several well-kno... more This study presents the life-dependent material parameters concept as applied to several well-known fatigue models for the purpose of life prediction under multiaxial and non-zero mean loading. The necessity of replacing the fixed material parameters with life-dependent parameters is demonstrated. The aim of the research here is verification of the life-dependent material parameters concept when applied to multiaxial fatigue loading with non-zero mean stress. The verification is performed with new experimental fatigue test results on a 7075-T651 aluminium alloy and S355 steel subjected to multiaxial cyclic bending and torsion loading under stress ratios equal to R = −0.5 and 0.0, respectively. The received results exhibit the significant effect of the non-zero mean value of shear stress on the fatigue life of S355 steel. The prediction of fatigue life was improved when using the life-dependent material parameters compared to the fixed material parameters.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Progress in fatigue life calculation by implementing life-dependent material parameters in multiaxial fatigue criteria

International Journal of Fatigue

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Rozkład naprężeń w krzyżowym złączu spawanym z uwzględnieniem rzeczywistego kształtu spoiny

Przegląd Spawalnictwa - Welding Technology Review

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Porównanie energetycznego modelu wyznaczania trwałości zmęczeniowej złączy spawanych z zaleceniami międzynarodowymi

Przegląd Spawalnictwa - Welding Technology Review

Bookmarks Related papers MentionsView impact