Search results for: Sudhanshu S. Singh

Items from 1 to 20 out of 28 results

article

Microstructural characterization and mechanical property prediction of a polymer matrix composite by X-ray synchrotron tomography and spatial correlation functions

Somya Singh, Hechao Li, Sudhanshu S. Singh, Jason Williams, more

SN Applied Sciences > 2019 > 1 > 10 > 1-14

Polymer matrix composites have become increasingly popular due to their ability of achieving high stiffness and strength without sacrificing desirable ductility. In the present work, we investigate the mechanical properties of borosilicate glass spheres reinforced polypropylene matrix composites with varying volume fractions of the glass spheres, using both tensile tests and nanoindentation measurements...

article

Study of Static Recrystallization Behavior of a Mg-6Al-3Sn Alloy

Gaurav Gaurav, R. Sarvesha, Sudhanshu S. Singh, Rajesh Prasad, more

Journal of Materials Engineering and Performance > 2019 > 28 > 6 > 3468-3477

In this study, the static recrystallization behavior of cold-rolled Mg-6Al-3Sn alloy has been studied during annealing in the temperature range of 200-400 °C. The role of Mg₁₇Al₁₂ precipitation during recrystallization is discerned. A significant drop in the grain size has been reported post-recrystallization. The results suggest that the recrystallization predominately started at the prior grain...

article

Dissolution Kinetics of Mg₁₇Al₁₂ Eutectic Phase and Its Effect on Corrosion Behavior of As-Cast AZ80 Magnesium Alloy

Kondababu Kadali, Dhananjay Dubey, R. Sarvesha, Harikrishna Kancharla, more

JOM > 2019 > 71 > 7 > 2209-2218

Mg₁₇Al₁₂ eutectic phase strongly affects the mechanical and corrosion properties of AZ80 magnesium alloy. In this study, the dissolution kinetics of Mg₁₇Al₁₂ phase was evaluated at 420°C. The dissolution was found to follow the Johnson–Mehl–Avrami–Kolmogorov (JMAK) model with time exponent (n) of ~ 0.61, suggesting a decrease in the rate of dissolution of Mg₁₇Al₁₂ with time due to enrichment of aluminum...

article

In situ tensile testing of tin (Sn) whiskers in a focused ion beam (FIB)/scanning electron microscope (SEM)

Renuka Vallabhaneni, Ehsan Izadi, Carl R. Mayer, C. Shashank Kaira, more

Microelectronics Reliability > 2017 > 79 > C > 314-320

Tin and tin-alloyed electroplated films are known to be susceptible to whisker growth under a range of conditions, many of which result in the generation of compressive stresses in the film. Compressive stress is considered to be one of the primary causes for whisker nucleation and growth. While extensive investigations have been performed on whisker growth, there have been few studies on the mechanical...

article

Probing Novel Microstructural Evolution Mechanisms in Aluminum Alloys Using 4D Nanoscale Characterization

C. Shashank Kaira, V. De Andrade, Sudhanshu S. Singh, C. Kantzos, more

Advanced Materials > 29 > 41 > n/a - n/a

Dispersions of nanoscale precipitates in metallic alloys have been known to play a key role in strengthening, by increasing their strain hardenability and providing resistance to deformation. Although these phenomena have been extensively investigated in the last century, the traditional approaches employed in the past have not rendered an authoritative microstructural understanding in such materials...

article

In Situ X-ray Microtomography of Stress Corrosion Cracking and Corrosion Fatigue in Aluminum Alloys

Sudhanshu S. Singh, Tyler J. Stannard, Xianghui Xiao, Nikhilesh Chawla

JOM > 2017 > 69 > 8 > 1404-1414

Structural materials are subjected to combinations of stress and corrosive environments that work synergistically to cause premature failure. Therefore, studies on the combined effect of stress and corrosive environments on material behavior are required. Existing studies have been performed in two dimensions that are inadequate for full comprehension of the three-dimensional (3D) processes related...

article

Effect of gallium addition on the microstructure and micromechanical properties of constituents in NbSi based alloys

Enyu Guo, Sudhanshu S. Singh, Carl Mayer, Xianyu Meng, more

Journal of Alloys and Compounds > 2017 > 704 > C > 89-100

The effect of gallium addition on the solidification microstructure and micromechanical properties of constituents was investigated in two sets of Nb16Si(1Ga) (in at.%) and Nb16Si22Ti2Cr2Al2Hf(5Ga) (all in at.%) alloys. The addition of gallium was found to promote the formation of Nb₅Si₃ and (Nb,Ti)₅Si₃ phases in Nb16Si1Ga and Nb16Si22Ti2Cr2Al-2Hf5Ga alloys, respectively. Evaluation of micromechanical...

article

Mechanical properties of microconstituents in Nb-Si-Ti alloy by micropillar compression and nanoindentation

Enyu Guo, Sudhanshu S. Singh, Chandrashekara S. Kaira, Xianyu Meng, more

Materials Science and Engineering: A > 2017 > 687 > C > 99-106

The micromechanical properties of both Nb solid solution (Nbss) and (Nb,Ti)₃Si silicide in a ternary Nb-16Si-22Ti (in at%) alloy were evaluated by nanoindentation and micropillar compression techniques. Nanoindentation tests showed that (Nb,Ti)₃Si possesses much higher hardness (15.6±0.6GPa) and Young's modulus (253.3±8.4GPa) than Nbss (5.2±0.4GPa and 124.9±5.1GPa, respectively). Stress-strain curves...

article

Fatigue behavior of aged and solution treated AZ61 Mg alloy at small length scale using nanoindentation

Shubhra Jain, Aditya Gokhale, Jayant Jain, Sudhanshu S. Singh, more

Materials Science and Engineering: A > 2017 > 684 > C > 652-659

Nano indentation low cycle fatigue test has been performed in AZ61 Mg alloy to study the effect of cyclic loading. The cyclic load-depth curves are observed in aged and solution treated conditions. An indentation fatigue depth propagation law is used to analyze the cyclic behavior of the alloy. The increase in steady state depth propagation rate with increasing stress intensity has been reported which...

chapter

Outplacement time and probability estimation using discrete event simulation

Sudhanshu S Singh, Rakesh R Pimplikar, Ritwik Chaudhuri, Gyana Parija

2016 Winter Simulation Conference (WSC) > 989 - 1000

2016 Winter Simulation Conference (WSC)

In today's rapidly changing technological scenario, tech giants revise their strategic alignment every couple of years. As a result, their workforce has to be adapted to the organization's strategy. Members of the workforce who are neither relevant to the strategic alignment, nor can be made relevant by reskilling, have to be either outplaced (i.e. placed in an another job within organization) or...

article

Hydrogen permeability and mechanical properties of NiNb-M (M = Sn, Ti and Zr) amorphous metallic membranes

Tianmiao Lai, Sudhanshu S. Singh, Arun Sundar S. Singaravelu, Kaushik Sridhar Vadari, more

Journal of Alloys and Compounds > 2016 > 684 > C > 359-365

In this paper, we report on the hydrogen permeability at 673 K of 45-μm thick splat-quenched Ni₆₀Nb₃₅M₅ (M = Sn, Ti and Zr) amorphous metallic membranes. Changes in mechanical properties, induced by hydrogen, were evaluated by nanoindentation. The effect of different elemental substitutions on both the hydrogen permeability and the thermal stability are discussed. Membrane crystalline structure was...

article

Microscale deformation behavior of bicrystal boundaries in pure tin (Sn) using micropillar compression

C. Shashank Kaira, Sudhanshu S. Singh, Antony Kirubanandham, Nikhilesh Chawla

Acta Materialia > 2016 > 120 > C > 56-67

Uniaxial compression experiments on micron-sized bicrystalline and single-crystalline pillars in tin (Sn) using a flat punch nanoindenter tip, have enabled us to quantify the difference in stress-strain behavior associated with grain boundaries in tin. It was found that bicrystalline micropillars containing a twin boundary nearly parallel to the loading axis were characterized by numerous strain bursts...

article

Geometry segmentation of voxelized representations of heterogeneous microstructures using betweenness centrality

Rui Yuan, Sudhanshu S. Singh, Nikhilesh Chawla, Jay Oswald

Materials Characterization > 2016 > 118 > C > 553-559

We present a robust method for automating removal of “segregation artifacts” in segmented tomographic images of three-dimensional heterogeneous microstructures. The objective of this method is to accurately identify and separate discrete features in composite materials where limitations in imaging resolution lead to spurious connections near close contacts. The method utilizes betweenness centrality,...

article

Microstructure and nanoindentation of the rostrum of Curculio longinasus Chittenden, 1927 (Coleoptera: Curculionidae)

Sudhanshu S. Singh, Michael A. Jansen, Nico M. Franz, Nikhilesh Chawla

Materials Characterization > 2016 > 118 > C > 206-211

The rostrum is an extension of the cuticle of the head of weevils (Coleoptera: Curculionidae) and is often used to bore holes for oviposition (the process of laying eggs) into host plant tissue where larval development occurs. In members of the genus Curculio Linnaeus, 1758, the rostrum is long, slender, and strongly curved, but is nevertheless used to excavate straight bore-holes in the fruit of...

article

A multilayer micromechanical model of the cuticle of Curculio longinasus Chittenden, 1927 (Coleoptera: Curculionidae)

M. Andrew Jansen, Sudhanshu S. Singh, Nikhilesh Chawla, Nico M. Franz

Journal of Structural Biology > 2016 > 195 > 2 > 139-158

Curculio longinasus Chittenden, 1927 (Coleoptera: Curculionidae), is a weevil species common throughout the southwestern United States that uses its rostrum – a very slender, curved, beak-like projection of the head – to excavate tunnels in plant organs (such as acorns) for egg laying (oviposition). Once the apical portion of the rostrum has been inserted into the preferred substrate for oviposition,...

article

Three dimensional microstructural characterization of nanoscale precipitates in AA7075-T651 by focused ion beam (FIB) tomography

Sudhanshu S. Singh, Jose J. Loza, Arno P. Merkle, Nikhilesh Chawla

Materials Characterization > 2016 > 118 > C > 102-111

The size and distribution of precipitates in Al 7075 alloys affects both the mechanical and corrosion behavior (including stress corrosion cracking and fatigue corrosion) of the alloy. Three dimensional (3D) quantitative microstructural analysis of Al 7075 in the peak aged condition (T651) allows for a better understanding of these behaviors. In this study, Focused ion beam (FIB) tomography was used...

article

A microstructure-guided constitutive modeling approach for random heterogeneous materials: Application to structural binders

Sumanta Das, Amit Maroli, Sudhanshu S. Singh, Tyler Stannard, more

Computational Materials Science > 2016 > 119 > C > 52-64

This paper presents a microstructure-guided modeling approach to predict the effective elastic response of heterogeneous materials, and demonstrates its application toward two highly heterogeneous, unconventional structural binders, i.e., iron carbonate and fly ash geopolymer. Microstructural information from synchrotron X-ray tomography (XRT) and intrinsic elastic properties of component solid phases...

article

Measurement of localized corrosion rates at inclusion particles in AA7075 by in situ three dimensional (3D) X-ray synchrotron tomography

Sudhanshu S. Singh, Jason J. Williams, Tyler J. Stannard, Xianghui Xiao, more

Corrosion Science > 2016 > 104 > C > 330-335

In situ X-ray synchrotron tomography was used to measure the localized corrosion rate of Mg₂Si particles present in 7075 aluminum alloys in deionized ultra-filtered (DIUF) water. The evolution of hydrogen bubbles was captured as a function of time and the measured volume was used to calculate the local corrosion rate of Mg₂Si particles. It was shown that in the absence of chloride ions, stress was...

article

In situ X-ray synchrotron tomographic imaging during the compression of hyper-elastic polymeric materials

Brian M. Patterson, Nikolaus L. Cordes, Kevin Henderson, Jason J. Williams, more

Journal of Materials Science > 2016 > 51 > 1 > 171-187

Cellular structures are present in many modern and natural materials and their proper utilization is crucial within many industries. Characterizing their structural and mechanical properties is complicated, in that they often have a stochastic cellular structure, and in addition, they often have hyper-elastic (i.e., non-linear) mechanical properties. Understanding the 3D structure and the dynamic...

article

Effective properties of a fly ash geopolymer: Synergistic application of X-ray synchrotron tomography, nanoindentation, and homogenization models

Sumanta Das, Pu Yang, Sudhanshu S. Singh, James C.E. Mertens, more

Cement and Concrete Research > 2015 > 78 > Part B > 252-262

Microstructural and micromechanical investigation of a fly ash-based geopolymer using: (i) synchrotron X-ray tomography (XRT) to determine the volume fraction and tortuosity of pores that are influential in fluid transport, (ii) mercury intrusion porosimetry (MIP) to capture the volume fraction of smaller pores, (iii) scanning electron microscopy (SEM) combined with multi-label thresholding to identify...

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INFONA - science communication portal

Search results for: Sudhanshu S. Singh

Microstructural characterization and mechanical property prediction of a polymer matrix composite by X-ray synchrotron tomography and spatial correlation functions

Study of Static Recrystallization Behavior of a Mg-6Al-3Sn Alloy

Dissolution Kinetics of Mg₁₇Al₁₂ Eutectic Phase and Its Effect on Corrosion Behavior of As-Cast AZ80 Magnesium Alloy

In situ tensile testing of tin (Sn) whiskers in a focused ion beam (FIB)/scanning electron microscope (SEM)

Probing Novel Microstructural Evolution Mechanisms in Aluminum Alloys Using 4D Nanoscale Characterization

In Situ X-ray Microtomography of Stress Corrosion Cracking and Corrosion Fatigue in Aluminum Alloys

Effect of gallium addition on the microstructure and micromechanical properties of constituents in NbSi based alloys

Mechanical properties of microconstituents in Nb-Si-Ti alloy by micropillar compression and nanoindentation

Fatigue behavior of aged and solution treated AZ61 Mg alloy at small length scale using nanoindentation

Outplacement time and probability estimation using discrete event simulation

Hydrogen permeability and mechanical properties of NiNb-M (M = Sn, Ti and Zr) amorphous metallic membranes

Microscale deformation behavior of bicrystal boundaries in pure tin (Sn) using micropillar compression

Geometry segmentation of voxelized representations of heterogeneous microstructures using betweenness centrality

Microstructure and nanoindentation of the rostrum of Curculio longinasus Chittenden, 1927 (Coleoptera: Curculionidae)

A multilayer micromechanical model of the cuticle of Curculio longinasus Chittenden, 1927 (Coleoptera: Curculionidae)

Three dimensional microstructural characterization of nanoscale precipitates in AA7075-T651 by focused ion beam (FIB) tomography

A microstructure-guided constitutive modeling approach for random heterogeneous materials: Application to structural binders

Measurement of localized corrosion rates at inclusion particles in AA7075 by in situ three dimensional (3D) X-ray synchrotron tomography

In situ X-ray synchrotron tomographic imaging during the compression of hyper-elastic polymeric materials

Effective properties of a fly ash geopolymer: Synergistic application of X-ray synchrotron tomography, nanoindentation, and homogenization models

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