Search results for: S. Tarafder

Items from 1 to 20 out of 79 results

article

Forming Limit Diagram Generation from In-Plane Uniaxial and Notch Tensile Test with Local Strain Measurement through Digital Image Correlation

S. K. Paul, S. Roy, S. Sivaprasad, S. Tarafder

Physical Mesomechanics > 2019 > 22 > 4 > 340-344

Requirement of forming limit curve appears indispensible for property check during formable sheet metal development cycle and quality control of formable sheet metal at production shop floor. In the present work, left side of the forming limit curve (uniaxial tensile to plane strain tensile) is experimentally determined from in-plane uniaxial and notch tensile test with local strain measurement through...

article

Orientation-dependent crack-tip blunting and crack propagation in a single crystal BCC iron

Surajit Kumar Paul, Sunil Kumar, S Tarafder

Bulletin of Materials Science > 2018 > 41 > 6 > 1-6

Atomistic simulations of cracks with four different orientations in body-centered cubic single crystal iron are presented using molecular dynamics. Crystal orientation has considerable effect on the activation and evolution of crack propagation mechanisms. The results reveal that (a) crack-tip blunting depends on the crystallographic orientation, (b) continuous generation of dislocations form crack...

article

Identification of Post-necking Tensile Stress–Strain Behavior of Steel Sheet: An Experimental Investigation Using Digital Image Correlation Technique

Surajit Kumar Paul, Satish Roy, S. Sivaprasad, H. N. Bar, more

Journal of Materials Engineering and Performance > 2018 > 27 > 11 > 5736-5743

The stress–strain behavior of sheet metal is commonly evaluated by tensile test. However, the true stress–strain curve is restricted up to uniform elongation of the material. Usually, after the uniform elongation of the material the true stress–strain is obtained by extrapolation. The present work demonstrates a procedure to find out the true tensile stress–strain curve of the steel sheet after necking...

article

A Simplified Procedure to Determine Post-necking True Stress–Strain Curve from Uniaxial Tensile Test of Round Metallic Specimen Using DIC

Surajit Kumar Paul, Satish Roy, S. Sivaprasad, S. Tarafder

Journal of Materials Engineering and Performance > 2018 > 27 > 9 > 4893-4899

Triaxial state of stress is usually generated in the necked zone because of neck geometry, and as a consequence proper correction of true tensile stress–strain curve after necking is mandatory. Various correction factors like Bridgman, Davidenkov and Spiridonova, Siebel and Schwaigere are available in the published literature to calculate true stress from mean axial stress. Similarly true strains...

article

High-Temperature Low-Cycle Fatigue Behavior in HAYNES 282: Influence of Initial Microstructure

K. Barat, M. Ghosh, S. Sivaprasad, Sujoy Kumar Kar, more

Metallurgical and Materials Transactions A > 2018 > 49 > 10 > 5211-5226

We present the low-cycle fatigue behavior of a new nickel-based superalloy in the temperature range of 650 °C to 760 °C. Two initial microstructures having different precipitate distribution has been chosen for this. Low-cycle fatigue behavior of these two microstructures has been characterized using mechanical parameters. These parameters include cyclic anisotropy, plastic strain accumulation and...

article

Effect of Strengthening Mechanism on Strain-Rate Related Tensile Properties of Low-Carbon Sheet Steels for Automotive Application

Anindya Das, Pinaki Biswas, S. Tarafder, D. Chakrabarti, more

Journal of Materials Engineering and Performance > 2018 > 27 > 7 > 3709-3722

In order to ensure crash resistance of the steels used in automotive components, the ensile deformation behavior needs to be studied and predicted not only under quasi-static condition, but also under dynamic loading rates. In the present study, tensile tests have been performed on four different automobile grade sheet steels, namely interstitial free steel, dual-phase 600 and 800, and a carbon manganese...

article

Comparative assessment of the fracture behaviour of micro-alloyed and API-5L X65 steels in simulated fuel grade ethanol environment

O.O. Joseph, C.A. Loto, S. Sivaprasad, J.A. Ajayi, more

Engineering Fracture Mechanics > 2018 > 189 > C > 1-12

In order to fully realize the benefit of pipeline and automotive materials in fuel ethanol applications, a comprehensive understanding of their fracture behaviour is essential. Very few studies have been undertaken on fracture of materials in stress corrosion environments. This paper presents a comparative assessment of the fracture toughness, tearing modulus and widths of stretch zones for API-5L...

article

Local Ratcheting Response in Dissimilar Metal Weld Joint: Characterization Through Digital Image Correlation Technique

Surajit Kumar Paul, Satish Roy, S. Sivaprasad, H. N. Bar, more

Journal of Materials Engineering and Performance > 2017 > 26 > 10 > 4953-4963

Ratcheting fatigue behavior of different alloys and their weld joints has been a topic of interest in the past few decades. However, little information is available about the ratcheting response in different zones, when a composite weld section is subjected to asymmetric loading cycle. This work aims at understanding the local ratcheting response in various zones of a dissimilar metal weld (DMW) joint...

article

Effect of loading conditions on nucleation of nano void and failure of nanocrystalline aluminum: An atomistic investigation

Surajit Kumar Paul, Sunil Kumar, S. Tarafder

Engineering Fracture Mechanics > 2017 > 176 > C > 257-262

Deformation mechanism, nano void nucleation and failure of nano crystalline aluminum are investigated for uniaxial, plane strain and equi biaxial loading conditions using atomistic simulation technique. Nano deformation twin formation is noticed for all three loading conditions. Grain boundary triple point is the site of nano void nucleation and the fracture mode is intergranular type. Early nano...

article

The Effect of Residual Stress on Fatigue crack growth rate in AISI 304LN Stainless Steel

Amit Prakash, H.N. Bar, S. Sivaprasad, S. Tarafder, more

Materials Today: Proceedings > 2017 > 4 > 2 Part A > 677-686

Fatigue crack growth rate (FCGR) was studied in SMAT- exposed AISI 304LN stainless steel. Compact Tension (CT) specimens were taken for this study. Specimens were exposed to SMAT at various exposure timefor generating varying compressive residual stresses and FCGR study was done on those specimens at R=-1. It was seen that exposure to SMAT, produced micro-cracks within the material that increased...

article

Influence of dynamic strain ageing on fracture behaviour and stretch zone formation of a reactor pressure vessel steel

Avik R. Das, Tamshuk Chowdhury, S. Sivaprasad, H. N. Bar, more

International Journal of Fracture > 2016 > 202 > 1 > 79-91

Fracture behaviour of a reactor pressure vessel steel has been studied under dynamic strain ageing (DSA) conditions. Severity of DSA is varied by changing both the loading rate and test temperature. Significant reduction in fracture toughness is noted at $$235\,{^{\circ }}\hbox {C}$$ 235 ∘ C , which is recovered with further increase of temperature at slow loading rate. DSA influence...

article

Comparative assessment of cyclic J-R curve determination by different methods in a pressure vessel steel

Tamshuk Chowdhury, S. Sivaprasad, H.N. Bar, S. Tarafder, more

Journal of Nuclear Materials > 2016 > 472 > Complete > 55-64

Cyclic J-R behaviour of a reactor pressure vessel steel using different methods available in literature has been examined to identify the best suitable method for cyclic fracture problems. Crack opening point was determined by moving average method. The η factor was experimentally determined for cyclic loading conditions and found to be similar to that of ASTM value. Analyses showed that adopting...

article

Testing and assessment of fatigue life prediction models for Indian PHWRs piping material under multi-axial load cycling

Punit Arora, Suneel K. Gupta, V. Bhasin, R.K. Singh, more

International Journal of Fatigue > 2016 > 85 > C > 98-113

In the present paper, experimental and analytical fatigue studies on primary piping material of Indian PHWRs, have been carried out under multi-axial loading with an aim to assess the adequacy of currently used fatigue life models based on ASME B&PV Sec-III procedure and plastic strain energy density. The experiments were conducted under axial, torsion and combined axial–torsion loading with different...

article

Strain rate effect on cyclic deformation behaviour of advanced ultra-supercritical boiler grade wrought Ni-based superalloy IN740H at 760°C

R.K. Singh, J.K. Sahu, S. Tarafder

Materials Science and Engineering: A > 2016 > 658 > C > 272-279

In order to understand the simultaneous operation of fatigue and creep mechanisms, strain rate (ε̇) effect on low cycle fatigue (LCF) behaviour of recently developed power plant grade wrought Ni-based superalloy IN740H was studied. Fatigue experiments were conducted in air, at 760°C at ε̇ values 10⁻², 10⁻³ and 10⁻⁴s⁻¹. The fatigue life significantly decreased at lower ε̇ values. Bilinear Coffin-Manson...

article

Stretch zone formation in cyclic fracture of 20MnMoNi55 pressure vessel steel

T. Chowdhury, S. Sivaprasad, H.N. Bar, S. Tarafder, more

Engineering Fracture Mechanics > 2015 > 148 > C > 60-72

Stretch zone formation during cyclic fracture in a nuclear pressure vessel steel has been examined. Cyclic fracture tests are carried out at different load ratios and incremental plastic displacements. Stretch zone features were manifested in local regions, however, their extent could be correlated to the test parameters employed. The mean stretch zone width decreased with R ratio and increased with...

article

Cyclic fracture behaviour of 20MnMoNi55 steel at room and elevated temperatures

T. Chowdhury, S. Sivaprasad, H. N. Bar, S. Tarafder, more

Fatigue & Fracture of Engineering Materials & Structures > 38 > 7 > 813 - 827

Cyclic fracture behaviour of 20MnMoNi55 steel has been evaluated at room temperature and elevated temperature of 300 °C. Fracture resistance at elevated temperature was found to be lower than that at room temperature. The deterioration in fracture resistance was due to dynamic strain ageing. Cyclic loading amplitude and frequency were also found to have an influence on fracture resistance. The features...

article

Ultrasonic quantification of high temperature cyclic damage in an advanced nickel based superalloy

Kaustav Barat, A. Metya, S. Sathpathy, S. Sivaprasad, more

Materials Science & Engineering A > 2015 > 625 > Complete > 194-204

Present paper discusses about a new methodology to quantify cyclic damage through ultrasonic measurement. Based on experimental results, correlations have been made between damage accumulated inside the material due to strain excursions and corresponding ultrasonic parameters. It has been proposed that based on the existing correlation between attenuation coefficient and number of cycles to failure,...

article

Incremental cyclic fracture behaviour of 20MnMoNi55 steel at room temperature

Tamshuk Chowdhury, S. Sivaprasad, H. N. Bar, S. Tarafder, more

International Journal of Fracture > 2015 > 192 > 1 > 117-132

Fracture behavior of low alloy steel 20MnMoNi55 has been evaluated under cyclic loading condition. Effect of unloading extent and degree of cycling on fracture resistance has been evaluated by varying load ratio $$(R)$$ ( R ) and incremental plastic displacement $$(\varDelta V)$$ ( Δ V ) . It is observed that the initiation fracture toughness and tearing modulus decreased significantly...

article

Development of new cyclic plasticity model for 304LN stainless steel through simulation and experimental investigation

N. Khutia, P.P. Dey, S. Sivaprasad, S. Tarafder

Mechanics of Materials > 2014 > 78 > Complete > 85-101

Cyclic plastic deformation characteristics of 304LN stainless steel material have been studied with two proposed cyclic plasticity models. Model MM-I has been proposed to improve the simulation of ratcheting phenomenon and model MM-II has the capability to simulate both cyclic hardening and softening characteristics of the material at various strain ranges. In the present paper, strain controlled...

article

Low-cyclic fatigue behavior of modified 9Cr–1Mo steel at elevated temperature

Krishna Guguloth, S. Sivaprasad, D. Chakrabarti, S. Tarafder

Materials Science & Engineering A > 2014 > 604 > Complete > 196-206

The low-cycle fatigue behavior of indigenously developed modified 9Cr–1Mo steel has been evaluated using a constant strain rate (1×10 ⁻³ s ⁻¹ ) at ambient temperature (25°C) and at elevated temperatures (500–600°C) over the strain amplitudes varying between ±0.7% and ±1.2%. Cyclic stress response showed a gradual softening regime that ended in a stress plateau until complete failure...

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INFONA - science communication portal

Search results for: S. Tarafder

Forming Limit Diagram Generation from In-Plane Uniaxial and Notch Tensile Test with Local Strain Measurement through Digital Image Correlation

Orientation-dependent crack-tip blunting and crack propagation in a single crystal BCC iron

Identification of Post-necking Tensile Stress–Strain Behavior of Steel Sheet: An Experimental Investigation Using Digital Image Correlation Technique

A Simplified Procedure to Determine Post-necking True Stress–Strain Curve from Uniaxial Tensile Test of Round Metallic Specimen Using DIC

High-Temperature Low-Cycle Fatigue Behavior in HAYNES 282: Influence of Initial Microstructure

Effect of Strengthening Mechanism on Strain-Rate Related Tensile Properties of Low-Carbon Sheet Steels for Automotive Application

Comparative assessment of the fracture behaviour of micro-alloyed and API-5L X65 steels in simulated fuel grade ethanol environment

Local Ratcheting Response in Dissimilar Metal Weld Joint: Characterization Through Digital Image Correlation Technique

Effect of loading conditions on nucleation of nano void and failure of nanocrystalline aluminum: An atomistic investigation

The Effect of Residual Stress on Fatigue crack growth rate in AISI 304LN Stainless Steel

Influence of dynamic strain ageing on fracture behaviour and stretch zone formation of a reactor pressure vessel steel

Comparative assessment of cyclic J-R curve determination by different methods in a pressure vessel steel

Testing and assessment of fatigue life prediction models for Indian PHWRs piping material under multi-axial load cycling

Strain rate effect on cyclic deformation behaviour of advanced ultra-supercritical boiler grade wrought Ni-based superalloy IN740H at 760°C

Stretch zone formation in cyclic fracture of 20MnMoNi55 pressure vessel steel

Cyclic fracture behaviour of 20MnMoNi55 steel at room and elevated temperatures

Ultrasonic quantification of high temperature cyclic damage in an advanced nickel based superalloy

Incremental cyclic fracture behaviour of 20MnMoNi55 steel at room temperature

Development of new cyclic plasticity model for 304LN stainless steel through simulation and experimental investigation

Low-cyclic fatigue behavior of modified 9Cr–1Mo steel at elevated temperature

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