Search results for: S. Sivaprasad

Items from 1 to 20 out of 93 results

article

Low‐cycle fatigue of IN 718: Effect of waveform

Kaustav Barat, S. Sivaprasad, Sujoy Kumar Kar, Soumitra Tarafder

Fatigue & Fracture of Engineering Materials & Structures > 42 > 12 > 2823 - 2843

The influence of various strain waveforms on the low‐cycle fatigue of IN 718 tested at 650°C has been investigated. The straining paths are accompanied by dwell‐induced creep component(s) or unequal strain distribution in different portions of cycles reducing strength of material. The investigation intends to clarify mainly mechanistic aspects of relaxation‐fatigue interaction. Features of time‐dependent...

article

Vulnerabilities in diabetic eye screening for children and young people in England

Maria C. Ibanez‐Bruron, Ameenat L. Solebo, Phillippa M. Cumberland, Jugnoo S. Rahi, more

Pediatric Diabetes > 20 > 7 > 932 - 940

Background Children and young people (CYP) living with diabetes require integrated child‐centered care. We hypothesized that suboptimal uptake to diabetic retinopathy screening in CYP may be partly related to the degree of services integration. We investigated the structure of the current pediatric diabetic eye care pathway and associations between service‐level characteristics and screening uptake...

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

Correction to: State of Grain Boundary Misorientation Due to Multiaxiality in Austenitic Stainless Steel

Rima Dey, Anindya Das, Soumitro Tarafder, S. Sivaprasad

Metallurgical and Materials Transactions A > 2019 > 50 > 5 > 2554-2554

This correction reflects an update to the authors’ affiliation.

article

The unmet need for better risk stratification of non‐proliferative diabetic retinopathy

S. Sivaprasad, E. Pearce

Diabetic Medicine > 36 > 4 > 424 - 433

Diabetic retinopathy is a common microvascular complication of diabetes and remains one of the leading causes of preventable blindness in working‐age people. Non‐proliferative diabetic retinopathy is the earliest stage of diabetic retinopathy and is typically asymptomatic. Currently, the severity of diabetic retinopathy is assessed using semi‐quantitative grading systems based on the presence or absence...

article

Environmentally Friendly Electricity Can Come From Municipal Waste

K. S. Sivaprasad, Surendra Saxena

Natural Gas & Electricity > 35 > 6 > 8 - 16

The conversion of millions of tons of municipal solid waste (MSW) to electricity is very important for our environment and industrial sectors.

article

A noninterventional study to monitor patients with diabetic macular oedema starting treatment with ranibizumab (POLARIS)

Jana Stefanickova, Jose Cunha‐Vaz, Michael Ulbig, Ian Pearce, more

Acta Ophthalmologica > 96 > 8 > e942 - e949

Purpose Antivascular endothelial growth factor agents are increasingly used in diabetic macular oedema (DME); however, there are few studies exploring their use in DME in real‐world settings. Methods POLARIS was a noninterventional, multicentre study to monitor 12‐month outcomes in patients starting ranibizumab treatment in routine practices. The primary outcome was mean change in visual acuity...

article

State of Grain Boundary Misorientation Due to Multiaxiality in Austenitic Stainless Steel

Rima Dey, Anindya Das, Soumitro Tarafder, S. Sivaprasad

Metallurgical and Materials Transactions A > 2019 > 50 > 1 > 47-51

Electron backscatter diffraction was used to study grain character under multiaxiality. Nonproportional loading conditions employing a triangular and sinusoidal wavepath resulted in higher low-angle grain boundaries in austenitic stainless steel. Contrastingly, significant martensitic transformation resulted from nonproportional cycling for the trapezoidal path, leading to increased medium-angle grain...

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

Starlike functions associated with exponential function and the lemniscate of Bernoulli

Kanika Khatter, V. Ravichandran, S. Sivaprasad Kumar

Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales.... > 2019 > 113 > 1 > 233-253

Let f be the function defined on the open unit disk, with $$f(0)=0=f'(0)-1$$ f ( 0 ) = 0 = f ′ ( 0 ) - 1 , satisfying the subordinations $$zf'(z)/f(z)\prec \alpha + (1-\alpha )e^{z}$$ z f ′ ( z ) / f ( z ) ≺ α + ( 1 - α ) e z or $$zf'(z)/f(z)\prec \alpha + (1-\alpha )\sqrt{1+ z}$$ z f ′ ( z ) / f ( z ) ≺ α + ( 1 - α ) 1 + z respectively, where $$0\le...

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

Comparative study on the effect of NaNO2 in corrosion inhibition of micro-alloyed and API-5L X65 steels in E20 simulated FGE

O.O. Joseph, S. Sivaprasad, O.S.I. Fayomi

Energy Procedia > 2017 > 119 > C > 953-960

The effect of sodium nitrite (NaNO₂) in the corrosion inhibition of micro-alloyed and API-5L X65 steels in E20 simulated fuel grade ethanol (SFGE) have been investigated via gravimetric method and morphological examination. While NaNO₂ addition may positively slow down corrosion rate, its concentration within the tested range of 0.2 – 1.0 g/L plays an insignificant role in improving the corrosion...

article

Energy absorption behaviour of different grades of steel sheets using a strain rate dependent constitutive model

Pundan K. Singh, Anindya Das, S. Sivaprasad, Pinaki Biswas, more

Thin-Walled Structures > 2017 > 111 > C > 9-18

This study is concerned with the numerical prediction of energy absorption behaviour of different grades of steel sheet. Typical square crush tube is studied owing to its similarity with various automotive structural components useful in crash events. An attempt has been made to characterize the materials for high strain rate behaviour (0.001–800/s) and use a strain rate dependent constitutive model...

article

Micromechanisms of deformation in dual phase steels at high strain rates

Anindya Das, Mainak Ghosh, Soumitra Tarafder, S. Sivaprasad, more

Materials Science and Engineering: A > 2017 > 680 > C > 249-258

The effect of strain rate (0.001–800/s) on two commercial ferrite-martensite dual phase steels (DP600 and DP800), having different martensite contents (10.2% and 33.2%, respectively) were investigated. Microstructures of the deformed samples have been studied to understand the influence of strain rate on the micro-mechanisms of deformation in dual phase steels. The observations reveal that the volume...

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

Effect of Loading Variations on Damage of SA333 C-Mn Steel

A. Chakrabarty, N. Khutia, H.N. Bar, P.P. Dey, more

Materials Today: Proceedings > 2017 > 4 > 2 Part A > 415-423

The mechanical properties of SA333 C-Mn Steel after fracture under diverse loading conditions have been investigated for further evaluation of damage. Miniature tensile specimens are machined by wire-EDM from the gauge portion of the failed specimens which were subjected to in phase and out of phase multiaxial loading and pure axial loading. From the experiment, it is observed that yield stress and...

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Search results for: S. Sivaprasad

Low‐cycle fatigue of IN 718: Effect of waveform

Vulnerabilities in diabetic eye screening for children and young people in England

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

Correction to: State of Grain Boundary Misorientation Due to Multiaxiality in Austenitic Stainless Steel

The unmet need for better risk stratification of non‐proliferative diabetic retinopathy

Environmentally Friendly Electricity Can Come From Municipal Waste

A noninterventional study to monitor patients with diabetic macular oedema starting treatment with ranibizumab (POLARIS)

State of Grain Boundary Misorientation Due to Multiaxiality in Austenitic Stainless Steel

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

Starlike functions associated with exponential function and the lemniscate of Bernoulli

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

Comparative study on the effect of NaNO2 in corrosion inhibition of micro-alloyed and API-5L X65 steels in E20 simulated FGE

Energy absorption behaviour of different grades of steel sheets using a strain rate dependent constitutive model

Micromechanisms of deformation in dual phase steels at high strain rates

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

Effect of Loading Variations on Damage of SA333 C-Mn Steel

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