Surajit Kumar Paul
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View article: Parametrizing the Hubble function instead of dark energy: Many possibilities
Parametrizing the Hubble function instead of dark energy: Many possibilities Open
In the present article, we propose a very simple parametrization of the Hubble function without parametrizing the dark components of the Universe. One of the novelties of the parametrization is that it may include a wide variety of the cos…
View article: Interacting dark energy after DESI DR2: a challenge for $Λ$CDM paradigm?
Interacting dark energy after DESI DR2: a challenge for $Λ$CDM paradigm? Open
We investigate the scenario of interacting dark energy through a detailed confrontation with various observational datasets. We quantify the interaction in a general way, through the deviation from the standard scaling of the dark matter e…
View article: Artificial neural network-based prediction of complete forming limit curves for steel in sheet metal forming
Artificial neural network-based prediction of complete forming limit curves for steel in sheet metal forming Open
Forming Limit Curve (FLC) is crucial for predicting material formability and preventing defects in the sheet metal forming industry. Traditionally, FLCs are determined through Nakajima and Marciniak tests, which assess the material's respo…
View article: A review on cyclic hardening and softening behavior of alloys
A review on cyclic hardening and softening behavior of alloys Open
Cyclic hardening and softening are vital aspects of the cyclic plastic deformation behaviour in alloys, and accurately predicting these responses is crucial for stress analysis in engineering components via finite element analysis. Cyclic …
View article: Significant Enhancement of Strength–Ductility Synergy of a Cost‐Effective Eutectic High‐Entropy Alloy via Strain‐Partition Engineering
Significant Enhancement of Strength–Ductility Synergy of a Cost‐Effective Eutectic High‐Entropy Alloy via Strain‐Partition Engineering Open
Although eutectic high‐entropy alloys (EHEAs) enjoy superior mechanical properties, their compositional chemistry suffers from the presence of costly alloying elements. To overcome this drawback, developing cobalt‐free, cost‐effective EHEA…
View article: Effect of Surface Roughness on the Friction Moment in a Lubricated Deep Groove Ball Bearing
Effect of Surface Roughness on the Friction Moment in a Lubricated Deep Groove Ball Bearing Open
Deep groove ball bearings (DGBBs) are extensively utilized in industrial machinery, mechanical systems, and household appliances due to their simple design, low maintenance, and ability to operate at high speeds. A critical issue in the pe…
View article: Cyclic deformation response of annealed low-carbon steel: Insights from ratcheting and LCF experiments
Cyclic deformation response of annealed low-carbon steel: Insights from ratcheting and LCF experiments Open
Low cycle fatigue (LCF) and ratcheting experiments were carried out on annealed low-carbon steel at room temperature within a laboratory environment, utilising stress and strain control modes. The annealed low-carbon steel consistently dem…
View article: The fatigue crack growth behavior of hydrogenated 9Cr‐1Mo steel: An experimental and numerical study
The fatigue crack growth behavior of hydrogenated 9Cr‐1Mo steel: An experimental and numerical study Open
This research investigates the fatigue crack evolution in P91 steel through experiments and extended finite element method (XFEM) simulation for as‐received and hydrogenated conditions. Hydrogen pre‐charging is performed using a constant c…
View article: Effect of central hole edge preparation, coefficient of friction and spring-back on hole expansion ratio of automotive steels
Effect of central hole edge preparation, coefficient of friction and spring-back on hole expansion ratio of automotive steels Open
The influence of the central hole-edge condition on the hole expansion ratio (HER) of four automotive-grade steel sheets is experimentally investigated in this work. The punched hole shows inferior HER for all selected automotive-grade ste…
View article: Influence of pre-strain on tensile response of extra deep drawing (EDD) steel under varying strain rates and crash performance
Influence of pre-strain on tensile response of extra deep drawing (EDD) steel under varying strain rates and crash performance Open
This study explores the impact of pre-strain on the uniaxial tensile stress-strain behavior of extra deep drawing (EDD) steel at varying strain rates. The EDD steel blanks were subjected to a uniaxial pre-strain of 15 % in either the trans…
View article: Local strain evolution and microstructural characterisation of hydrogen-induced damage at different strain rates in dual phase (DP 780) steel
Local strain evolution and microstructural characterisation of hydrogen-induced damage at different strain rates in dual phase (DP 780) steel Open
Effect of strain rate on the damage behaviour of hydrogen (H)-charged dual phase (DP 780) steel via the in-situ digital image correlation (DIC) technique is investigated in this work. Since stress concentration sites like notches are commo…
View article: A cyclic plastic zone size-based defect tolerant design approach to predict the fatigue life of additively manufactured alloys
A cyclic plastic zone size-based defect tolerant design approach to predict the fatigue life of additively manufactured alloys Open
The primary obstacles to utilizing additively manufactured metallic alloys in industry are their inadequate ductility and manufacturing imperfections. Defects in the alloys can result in stress concentration, which can further deteriorate …
View article: Effect of forming strain on low cycle, high cycle and notch fatigue performance of automotive grade dual phase steels: A review
Effect of forming strain on low cycle, high cycle and notch fatigue performance of automotive grade dual phase steels: A review Open
In many engineering structural applications, including car body structures, sheet metal formed components are used. A systematic investigation of the impact of forming strain on fatigue life is necessary for an accurate prediction of a for…
View article: Image Restoration Quality Measurement using Noise Filters
Image Restoration Quality Measurement using Noise Filters Open
The aim of this project is to implement different features of image restoration. We consider a vectorised picture and take pictures of it with our mobile for two configurations, the first lit by natural light, the second without the light.…
View article: Deciphering the ultra-steep-spectrum diffuse radio sources discovered in the cool-core cluster Abell 980
Deciphering the ultra-steep-spectrum diffuse radio sources discovered in the cool-core cluster Abell 980 Open
Clusters of galaxies are excellent laboratories for studying recurring nuclear activity in galactic nuclei since their hot gaseous medium can vastly prolong the detectability of their radio lobes via better confinement. We report here a mu…
View article: Controlling factors of forming limit curve: A review
Controlling factors of forming limit curve: A review Open
Sheet metal forming industry widely adopted the forming limit curve (FLC) as a limiting criterion in sheet metal forming. Regardless of its commercial importance, controlling factors of FLC are not systematically investigated up to date. T…
View article: Effect of martensite volume fraction on cyclic plastic deformation behavior of dual phase steel: micromechanics simulation study
Effect of martensite volume fraction on cyclic plastic deformation behavior of dual phase steel: micromechanics simulation study Open
The cyclic plastic deformation of an archetypal microstructure dual phase steels has been examined via micromechanics modelling based on representative volume elements technique. The dual phase steel has soft ferrite – matrix with hard mar…
View article: A critical review of experimental aspects in ratcheting fatigue: microstructure to specimen to component
A critical review of experimental aspects in ratcheting fatigue: microstructure to specimen to component Open
In the past three decades ratcheting fatigue has attracted lots of research interest. Ratcheting can be defined as the directional progressive accumulation of plastic deformation of a material when it is subjected to a primary load along w…