Mahato, Anirban, Sachdev, Anil K, Biswas, SK
In pursuing the mechanics of wear of cast aluminium–silicon alloy engine bore we report here the sinking of load bearing silicon protrusions under normal loading. After establishing the buried...
Mahato, Anirban, Sachdev, Anil K, Biswas, SK
In pursuing the mechanics of wear of cast aluminium–silicon alloy engine bore we report here the sinking of load bearing silicon protrusions under normal loading. After establishing the buried...
Effect of residual stress on the fracture strength of columnar TiN films (2007)
Suresha, SJ, Gunda, R, Jayarama, V, Biswas, SK
The intercolumnar fracture strength of a columnar TiN film was deconvoluted by nanoindentation load-displacement curves. The columnar boundary strength of such films strongly depends on the amount of...
Ultra Mild Wear in Lubricated Tribology of an Aluminium Alloy (2007)
Das, Sarmistha, Varalakshmi, K, Jayaram, V., Biswas, SK
Flat faces of steel pins were slid on an eutectic aluminium silicon alloy under lubricated condition in the 1–100 MPa mean contact pressure range and 0.2 m/ s sliding speed. Two transition in wear...
Toughening through multilayering in TiN–AlTiN films (2007)
Suresha, SJ, Math, S, Jayaram, V, Biswas, SK
The damage response of columnar multilayers of TiN and AlTiN to Vickers indentation is studied through focused ion beam machining and elastic modelling. Multilayers display an enhanced resistance,...
Effect of residual stress on the fracture strength of columnar TiN films (2007)
Suresha, SJ, Gunda, R, Jayarama, V, Biswas, SK
The intercolumnar fracture strength of a columnar TiN film was deconvoluted by nanoindentation load-displacement curves. The columnar boundary strength of such films strongly depends on the amount of...
Toughening through multilayering in TiN–AlTiN films (2007)
Suresha, SJ, Math, S, Jayaram, V, Biswas, SK
The damage response of columnar multilayers of TiN and AlTiN to Vickers indentation is studied through focused ion beam machining and elastic modelling. Multilayers display an enhanced resistance,...
Ultra Mild Wear in Lubricated Tribology of an Aluminium Alloy (2007)
Das, Sarmistha, Varalakshmi, K, Jayaram, V., Biswas, SK
Flat faces of steel pins were slid on an eutectic aluminium silicon alloy under lubricated condition in the 1–100 MPa mean contact pressure range and 0.2 m/ s sliding speed. Two transition in wear...
Math, Souvik, Suresha, SJ, Jayaram, V, Biswas, SK
In this paper we discuss various contact damage modes in thin TiN films on steel substrate with increasing load. To understand the displacement at different points along the depth of the film, we...
Mukherjee, S, Jayaram, V, Biswas, SK
We use a previously formulated solution of the Navier’s equation to calculate stress intensity factor in a notched bar bonded to a substrate. We evolve a procedure for determining the stress...
In pursuing the boundary lubrication tribology of aluminium, we first explore the change in chain mobility and conformational order of alkylsilane monolayer self-assembled on aluminium surface with...
Math, S, Jayaram, V, Biswas, SK
We have demonstrated previously, using nanoindentation, that the film thickness and substrate plasticity, the important two external variables in the film layer, control the failure of the film in a...
Mukherjee, S, Jayaram, V, Biswas, SK
We use a previously formulated solution of the Navier’s equation to calculate stress intensity factor in a notched bar bonded to a substrate. We evolve a procedure for determining the stress...
In pursuing the boundary lubrication tribology of aluminium, we first explore the change in chain mobility and conformational order of alkylsilane monolayer self-assembled on aluminium surface with...
Math, Souvik, Suresha, SJ, Jayaram, V, Biswas, SK
In this paper we discuss various contact damage modes in thin TiN films on steel substrate with increasing load. To understand the displacement at different points along the depth of the film, we...
Khatri, OP, Devaprakasam, D, Biswas, SK
We have measured the frictional responses of two silane molecules (Octadecyltrichlorosilane; OTS and 1H, 1H, 2H, 2H-Perfluorooctyltrichlorosilane; FOTS) self-assembled on an aluminium substrate in...
Boundary lubrication additives for aluminium: A journey from nano to macrotribology (2005)
Devaprakasam, D, Khatri, OP, Shankar, N, Biswas, SK
The tribology of two potential additive molecules for aluminium has been studied in the self assembled monolayer state at low loads $(10^{-9}-10^{-2} N)$ and in dispersion state in n-hexadecane at...
Fracture mode transitions during indentation of columnar TiN coatings on metal (2005)
Bhowmick, S, Bhide, R, Hoffman, M, Jayaram, V, Biswas, SK
Pyramidal indentations and focused-ion-beam machining have been used to study the damage during contact loading of textured columnar titanium nitride hard coatings on three steels and aluminium. The...
Molecular damping: Mechanical response of self-assembled monomolecular layer to compression (2005)
We use a displacement-controlled dual double-cantilever-based surface-force-type apparatus to dynamically probe perfluorooctyl trichlorosilane monolayers self-assembled on aluminum and silicon...
Gunda, R, Biswas, SK, Bhowmick, S, Jayaram, V
We investigate here the axial and transverse mechanical properties of thin (1.5-7 \mu m) titanium nitride films deposited on high-speed steel by cathodic arc evaporation. The deposited films are...
Bhowmick, S, Jayaram, V, Biswas, SK
A columnar TiN film under contact loading fails by shear fracture along inter-columnar boundaries. To deconvolute inter-columnar fracture strength from load-displacement curves, nanoindentation...
Prathima, N, Harini, A, Rai, Neeraj, Chandrashekara, RH, Ayappa, KG, Sampath, S, ...
The thermal stability of short alkanethiol $CH_3(CH_2)_7SH (C_8)$ and long $C_1_8$ self-assembled monolayers (SAMs) is investigated using grazing angle reflection-absorption infrared spectroscopy,...
Measurement of stiffness and damping constant of self-assembled monolayers (2005)
We design and fabricate an apparatus which uses two dual double cantilever flexures to probe mechanical properties of self-assembled monolayers (SAM) under compression. The cantilevers were designed...
Prathima, N, Harini, A, Rai, Neeraj, Chandrashekara, RH, Ayappa, KG, Sampath, S, ...
The thermal stability of short alkanethiol $CH_3(CH_2)_7SH (C_8)$ and long $C_1_8$ self-assembled monolayers (SAMs) is investigated using grazing angle reflection-absorption infrared spectroscopy,...
Bhowmick, S, Jayaram, V, Biswas, SK
A columnar TiN film under contact loading fails by shear fracture along inter-columnar boundaries. To deconvolute inter-columnar fracture strength from load-displacement curves, nanoindentation...
Gunda, R, Biswas, SK, Bhowmick, S, Jayaram, V
We investigate here the axial and transverse mechanical properties of thin (1.5-7 \mu m) titanium nitride films deposited on high-speed steel by cathodic arc evaporation. The deposited films are...
Fracture mode transitions during indentation of columnar TiN coatings on metal (2005)
Bhowmick, S, Bhide, R, Hoffman, M, Jayaram, V, Biswas, SK
Pyramidal indentations and focused-ion-beam machining have been used to study the damage during contact loading of textured columnar titanium nitride hard coatings on three steels and aluminium. The...
Molecular damping: Mechanical response of self-assembled monomolecular layer to compression (2005)
We use a displacement-controlled dual double-cantilever-based surface-force-type apparatus to dynamically probe perfluorooctyl trichlorosilane monolayers self-assembled on aluminum and silicon...
Boundary lubrication additives for aluminium: A journey from nano to macrotribology (2005)
Devaprakasam, D, Khatri, OP, Shankar, N, Biswas, SK
The tribology of two potential additive molecules for aluminium has been studied in the self assembled monolayer state at low loads $(10^{-9}-10^{-2} N)$ and in dispersion state in n-hexadecane at...
Khatri, OP, Devaprakasam, D, Biswas, SK
We have measured the frictional responses of two silane molecules (Octadecyltrichlorosilane; OTS and 1H, 1H, 2H, 2H-Perfluorooctyltrichlorosilane; FOTS) self-assembled on an aluminium substrate in...
Measurement of stiffness and damping constant of self-assembled monolayers (2005)
We design and fabricate an apparatus which uses two dual double cantilever flexures to probe mechanical properties of self-assembled monolayers (SAM) under compression. The cantilevers were designed...
Khatri, Prakash Om, Biswas, SK
In search for a good boundary lubricant additive for aluminium substrates we investigate the molecular disorder retained in a monolayer self-assembled on an aluminium surface subjected to thermal...
Boundary Lubricated Tribology of an Aluminum-Silicon Alloy Sliding Against Steel (2004)
We have slid steel pins on aluminium-silicon alloy discs in the boundary lubrication regime in the presence of one drop of oil. We have explored the effect of base oil and additivated engine oil on...
Nature of contact deformation of TiN films on steel (2004)
Bhowmick, S, Xie, ZH, Hoffman, M, Jayaram, V, Biswas, SK
Nanoindentation experiments were carried out on a columnar similar to1.5-mum-thick TiN film on steel using a conical indenter with a 5-mum tip radius. Microstructural examination of the contact zone...
Devaprakasam, D, Sampath, S, Biswas, SK
Thermal stability behavior of 1H,1H,2H,2H-perfluorooctyl trichlorosilane self-assembled on aluminum substrates is characterized using a grazing-angle Fourier transform infrared spectrometer, Fourier...
Nature of contact deformation of TiN films on steel (2004)
Bhowmick, S, Xie, ZH, Hoffman, M, Jayaram, V, Biswas, SK
Nanoindentation experiments were carried out on a columnar similar to1.5-mum-thick TiN film on steel using a conical indenter with a 5-mum tip radius. Microstructural examination of the contact zone...
Khatri, Prakash Om, Biswas, SK
In search for a good boundary lubricant additive for aluminium substrates we investigate the molecular disorder retained in a monolayer self-assembled on an aluminium surface subjected to thermal...
Devaprakasam, D, Sampath, S, Biswas, SK
Thermal stability behavior of 1H,1H,2H,2H-perfluorooctyl trichlorosilane self-assembled on aluminum substrates is characterized using a grazing-angle Fourier transform infrared spectrometer, Fourier...
Boundary Lubricated Tribology of an Aluminum-Silicon Alloy Sliding Against Steel (2004)
We have slid steel pins on aluminium-silicon alloy discs in the boundary lubrication regime in the presence of one drop of oil. We have explored the effect of base oil and additivated engine oil on...
A numerical fracture analysis of indentation into thin hard films on soft substrates (2003)
Sriram, K, Narasimhan, R, Biswas, SK
In this paper, finite element simulations of spherical indentation of a thin hard film deposited on a soft substrate are carried out. The primary objective of this work is to understand the mechanics...
Contact damage in TiN coatings on steel (2003)
Bhowmick, S, Kale, AN, Jayaram, V, Biswas, SK
Damage mechanisms beneath Vickers indentations are examined on 5\mu m TiN film deposited on stainless steel substrate as a function of load. Prominent mode of cracking includes surface edge cracks...
Design of a flexure for surface forces apparatus (2003)
We report the design of a variation of a double cantilever flexure system used for the measurement of displacement and force in surface force apparatus (SFA). The new force sensor is called dual...
A numerical fracture analysis of indentation into thin hard films on soft substrates (2003)
Sriram, K, Narasimhan, R, Biswas, SK
In this paper, finite element simulations of spherical indentation of a thin hard film deposited on a soft substrate are carried out. The primary objective of this work is to understand the mechanics...
Design of a flexure for surface forces apparatus (2003)
We report the design of a variation of a double cantilever flexure system used for the measurement of displacement and force in surface force apparatus (SFA). The new force sensor is called dual...
Contact damage in TiN coatings on steel (2003)
Bhowmick, S, Kale, AN, Jayaram, V, Biswas, SK
Damage mechanisms beneath Vickers indentations are examined on 5\mu m TiN film deposited on stainless steel substrate as a function of load. Prominent mode of cracking includes surface edge cracks...
Estimation of surface temperature of a pin wearing on a disk (2002)
Singh, Aravind R, Narasimham, GSVL, Biswas, SK
The surface bulk temperature of a titanium alloy pin sliding on an alumina flat disk surface is estimated semi-empirically by measuring the temperature at two points along the pin axis away from the...
Tantri, PS, Jayasingh, EM, Biswas, SK, Ramasesha, Sheela K
Wear experiments performed on steel disc with increasing load for monolithic MoSi2 of different densities and its composite with TiB2 showed three distinct wear regimes. The specimens exhibited...
Estimation of surface temperature of a pin wearing on a disk (2002)
Singh, Aravind R, Narasimham, GSVL, Biswas, SK
The surface bulk temperature of a titanium alloy pin sliding on an alumina flat disk surface is estimated semi-empirically by measuring the temperature at two points along the pin axis away from the...
Performance of monolithic and TiB2 reinforced MoSi2 in dry sliding contact with steel (2002)
Jayasingh, EM, Tantria, TA, Bhaskaran, TA, Biswas, SK, Ramasesha, SK
MoSi2 and its composite with TiB2 (10 and 20 wt.%) particulates were synthesized by the hot pressing technique. Dry sliding wear experiments were done on these samples by the pin-on-disc method on an...
Measurements of stiff-material compliance on the nanoscale using ultrasonic force microscopy (2000)
Dinelli, F, Biswas, SK, Briggs, GAD, Kolosov, OV
Ultrasonic force microscopy (UFM) was introduced to probe nanoscale mechanical properties of stiff materials. This was achieved by vibrating the sample far above the first resonance of the probing...
Measurements of stiff-material compliance on the nanoscale using ultrasonic force microscopy (2000)
Dinelli, F, Biswas, SK, Briggs, GAD, Kolosov, OV
Ultrasonic force microscopy (UFM) was introduced to probe nanoscale mechanical properties of stiff materials. This was achieved by vibrating the sample far above the first resonance of the probing...
Deconvolution of hardness from data obtained from nanoindentation of rough surfaces (1999)
Variation of hardness with penetration in nanoindentation of a rough surface is a compound effect of variation in asperity geometry with penetration, designated geometric effect, and genuine property...
Sliding wear of cadmium against alumina (1999)
Singh, Arvind R, Biswas, SK, Kailas, Satish V
As cast cadmium rods were slid against alumina at a load of 50 N and sliding speeds from $0.1 \hspace{2mm}ms^{-1}$ to $ 4 \hspace{2mm} ms^{-1}$. The wear characteristics of cadmium were related to...
Wear of $Al_2O_3-SiC-(Al,Si)$ melt oxidised ceramic composites (1999)
$Al_2O_3-SiC-(Al,Si)$ cermets are fabricated using the melt oxidation route. The tribological properties of the composites are tested under adhesive sliding and two body abrasion conditions. Under...
Power spectra of roughness caused by grinding of metals (1999)
Venkatesh, K, Bobji, MS, Biswas, SK
The roughness of metallic surfaces generated by machining depends on the intended intervention by the tool and the inadvertent consequences determined by the response of metals. The roughness...
Power spectra of roughness caused by grinding of metals (1999)
Venkatesh, K, Bobji, MS, Biswas, SK
The roughness of metallic surfaces generated by machining depends on the intended intervention by the tool and the inadvertent consequences determined by the response of metals. The roughness...
Deconvolution of hardness from data obtained from nanoindentation of rough surfaces (1999)
Variation of hardness with penetration in nanoindentation of a rough surface is a compound effect of variation in asperity geometry with penetration, designated geometric effect, and genuine property...
Wear of $Al_2O_3-SiC-(Al,Si)$ melt oxidised ceramic composites (1999)
$Al_2O_3-SiC-(Al,Si)$ cermets are fabricated using the melt oxidation route. The tribological properties of the composites are tested under adhesive sliding and two body abrasion conditions. Under...
Sliding wear of cadmium against alumina (1999)
Singh, Arvind R, Biswas, SK, Kailas, Satish V
As cast cadmium rods were slid against alumina at a load of 50 N and sliding speeds from $0.1 \hspace{2mm}ms^{-1}$ to $ 4 \hspace{2mm} ms^{-1}$. The wear characteristics of cadmium were related to...
Estimation of hardness by nanoindentation of rough surfaces (1998)
The roughness of a surface influences the surface mechanical properties, estimated using nanoindentation data. Assuming a relation between the penetration depth normalized with respect to a roughness...
Venkatesh, K, Bobji, MS, Biswas, SK
The machining of copper surface generates a topography which in the direction normal to the tool travel is a reflection of the tool edge topography and is caused by plastic ploughing even at...
Singh, Arvind R, Sood, AK, Jayaram, V, Biswas, SK
Residual stresses can be generated in composites under two conditions (1): (a) processing of the composite can lead to ‘microresidual stress’ and (b) machining operations, like grinding can lead...
Estimation of hardness by nanoindentation of rough surfaces (1998)
The roughness of a surface influences the surface mechanical properties, estimated using nanoindentation data. Assuming a relation between the penetration depth normalized with respect to a roughness...
Singh, Arvind R, Sood, AK, Jayaram, V, Biswas, SK
Residual stresses can be generated in composites under two conditions (1): (a) processing of the composite can lead to ‘microresidual stress’ and (b) machining operations, like grinding can lead...
Venkatesh, K, Bobji, MS, Biswas, SK
The machining of copper surface generates a topography which in the direction normal to the tool travel is a reflection of the tool edge topography and is caused by plastic ploughing even at...
Deformation due to contact between a two-dimensional rough surface and a smooth cylinder (1997)
Stresses generated due to contact between an ideally rough but flat surface and a smooth cylinder are calculated using complex variable analysis. At low normal loads there are two possible responses:...
Effect of roughness on the measurement of nanohardness—a computer simulation study (1997)
Bobji, MS, Biswas, SK, Pethica, JB
This letter reports a simulation study of depth sensing nanoindentation on a rough surface. The estimated mean hardness and scatter are both influenced by roughness, irrespective of whether there is...
Sliding wear of titanium (1997)
Titanium pins were slid against flat surfaces of alumina disks under dry condition and a normal load of 50 N at sliding speeds varying from 0.1 to 4 ms-1. Estimated strain rate and temperature...
Effect of roughness on the measurement of nanohardness—a computer simulation study (1997)
Bobji, MS, Biswas, SK, Pethica, JB
This letter reports a simulation study of depth sensing nanoindentation on a rough surface. The estimated mean hardness and scatter are both influenced by roughness, irrespective of whether there is...
Deformation due to contact between a two-dimensional rough surface and a smooth cylinder (1997)
Stresses generated due to contact between an ideally rough but flat surface and a smooth cylinder are calculated using complex variable analysis. At low normal loads there are two possible responses:...
Sliding wear of titanium (1997)
Titanium pins were slid against flat surfaces of alumina disks under dry condition and a normal load of 50 N at sliding speeds varying from 0.1 to 4 ms-1. Estimated strain rate and temperature...
Contact between curved rough bodies is an important engineering problem. The paper addresses the problem in its simplest form where a smooth rigid cylinder presses down an elastic half space bounded...
Determination and study of the strength of the blister field generated by conical indentation (1996)
A superposed combination of the Bousinesq and blister field adequately describes the stress field in an indented subsurface. A method based on energy conservation is used to predict the value of the...
Contact between curved rough bodies is an important engineering problem. The paper addresses the problem in its simplest form where a smooth rigid cylinder presses down an elastic half space bounded...
Determination and study of the strength of the blister field generated by conical indentation (1996)
A superposed combination of the Bousinesq and blister field adequately describes the stress field in an indented subsurface. A method based on energy conservation is used to predict the value of the...
Strain rate response and its effect in plane strain abrasion of metals by a wedge (1995)
The microstructural flow behavior of titanium and copper under uniaxial compression has been qualitatively related to the surface morphology and subsurface flow during plane strain abrasion. Uniaxial...
Strain rate response and its effect in plane strain abrasion of metals by a wedge (1995)
The microstructural flow behavior of titanium and copper under uniaxial compression has been qualitatively related to the surface morphology and subsurface flow during plane strain abrasion. Uniaxial...
Mitra, Nibedita, Vijayan, Kalyani, Bai Pramila, BN, Biswas, SK
Cutting of Y103-doped TZP rods by a low-speed diamond aw introduces an unidentified, metastable phase X r.Zr0 2 ) coexisting with the tetragonal (t-Zr0 2 ) and the uonoclinic (m-Zro 2 ) phases...
The pinning potential of an ellipsoidal inclusion in an $YBa_2Cu_30_7$ (YBCO) film, deposited on a substrate, in the presence of film stress, has been estimated. The stress fields at the tip of the...