01656nas a2200169   4500008004100000245009900041210006900140260000800209300001400217490000800231520102800239100002501267700002401292700002301316700002401339856012301363       2017                        eng d00aUnderstanding the factors influencing quality of writing and wiping for chalk and board system0 aUnderstanding the factors influencing quality of writing and wip  cAPR  a1727-17370 v1123 aThis article reports the properties of a calcium carbonate-based writing chalk prepared at the CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI) and, further, our efforts to understand the process of writing with the chalk on two different boards. The optimum density of the chalk was found to be 1.52 g ml(-1), keeping in mind the careful balancing act between strength and dust-free nature of the chalk on one hand, and the ease of particle transfer onto the board on the other. Writing with the chalk yielded thin and compact appearance on a ceramic board, while that on a polymeric board was relatively broad and dispersed. Atomic force and scanning electron microscopic studies were carried out to rationalize the observation by correlating roughness on the board with the distribution of chalk particles. Wiping efficiency of the polyurethane-based duster prepared at CSIR-CSMCRI was compared with commercial duster, and the observations rationalized again with the scanning electron microscopy.1 aThakur, Rajendra, S.1 aShukla, Jignesh, J.1 aDesale, Girish, R.1 aGhosh, Pushpito, K.  uhttps://library.ncl.res.in/content/understanding-factors-influencing-quality-writing-and-wiping-chalk-and-board-system02139nas a2200133   4500008004100000245012300041210006900164260000800233490000600241520158800247100001701835700002301852856013001875       2018                        eng d00aDesign and development of a test rig to investigate the load deflection characteristics of helical spring lock washers0 aDesign and development of a test rig to investigate the load def  cMAR0 v93 aPurpose The helical spring lock washer is a part of nut-bolt joint assembly used in different industries like automobile, aerospace, mechanical, chemical, electrical, electronics, etc. It works as a part of temporary joint and plays important role in loosening behavior of assembly under dynamic (vibrations) conditions. Thus, it is necessary to investigate the performance of helical spring lock washer under different controlled operating conditions in order to satisfy its functional requirement. Design/methodology/approach In the present investigation, a novel test rig is designed and developed to determine the load deflection characteristics of helical spring lock washers. The test rig facilitates the controlled linear displacement of the Helical Spring Lock (HSL) washer with predetermined angular rotation of the handle gives the corresponding reaction load on the display. Additionally, the repeatability and reproducibility of the test rig was carried out. Findings The newly designed and developed test rig is enough capable to differentiate the load deflection characteristics during compressive loading and unloading of helical spring lock washers. Additionally, the loss of strain energy can be determined from the load deflection characteristics of helical spring lock washer. Originality/value The present test rig is designed and developed to investigate the load deflection characteristics under compressive loading and unloading of Helical spring lock washer. The test rig has least count of 0.4905N for load measurement and 0.01389 mm for linear displacement.1 aWagh, Hemant1 aDesale, Girish, R.  uhttps://library.ncl.res.in/content/design-and-development-test-rig-investigate-load-deflection-characteristics-helical-spring01959nas a2200157   4500008004100000022001300041245010600054210006900160260000800229300002700237490000800264520135300272100002401625700002301649856012901672       2018                        eng d  a0742478700aEffects of constant kinetic energy of different impacting particles on slurry erosion wear of AA 60630 aEffects of constant kinetic energy of different impacting partic  cMAY  aArticle Number: 0316050 v1403 aThe present experimental study investigates the effect of constant kinetic energy on erosion wear of aluminum alloy 6063. Three different natural erodents (quartz, silicon carbide, and alumina) with different particle sizes are used to impact at 45 deg and 90 deg impact angles. For calculating the number of particles in the slurry pot, it is assumed that the solid particles are of spherical shape. The total numbers of impacting solid particles were kept constant by adjusting the solid concentration, velocity, and test duration. The scanning electron microscope (SEM) images of the three erodents show that the alumina particles have sharp edges with more angularity, and silicon carbide particles have subangular nature while quartz particles are blocky in shape. The mass loss per particle at 45 deg impact angle is observed higher than at normal impact angle. It may be due to the change in material removal mechanism with changing the impact angle. It is also found that the mass loss per particle from the target material having different particle size with constant kinetic energy remains constant for respective erodents. This indicates that the velocity exponent of impacting particles is around 2. The SEM images of eroded surfaces reveal the different mechanisms of material removal at 45 deg impact angle and at normal impact angle.1 aNandre, Bhushan, D.1 aDesale, Girish, R.  uhttps://library.ncl.res.in/content/effects-constant-kinetic-energy-different-impacting-particles-slurry-erosion-wear-aa-606301775nas a2200241   4500008004100000022001300041245009600054210006900150260000900219300001500228490000600243520103400249653001201283653001501295653001001310653001101320653001001331653000801341653001901349100002401368700002301392856011801415       2018                        eng d  a2214785300aStudy the effect of impact angle on slurry erosion wear of four different ductile materials0 aStudy the effect of impact angle on slurry erosion wear of four   cAPR   a 7561-75700 v53 a<p>The test rig fabricated for the present work has an ability to study the effect of orientation angle of erosion wear. The particles of Indian Standard sand (Quartz) selected as erodent for the present investigation because it is the most widely occurs in natural slurries. Experimental investigations on erosion behavior of ductile materials AISI SS304, AA 6063, Copper and Brass have been carried out using solid-water mixtures of the above erodent. The erosion wear due to solid-liquid mixture of IS Sand and tap water at different impact angles shows typical ductile erosion behavior for the selected materials. The maximum erosion is observed at 22.5° angle for AISI SS 304, 45o for AA 6063, 22.5o for Copper and 30o for Brass. The minimum erosion is observed at 90o orientation angle for all the materials. The eroded specimens were examined under the Scanning Electron Microscope (SEM) at minimum and maximum wear orientation angles. The SEM micrographs of eroded specimens depict the mechanism of material removal.</p>10aAA 606310aAISI SS30410abrass10aCopper10aQuart10aSEM10aSlurry erosion1 aNandre, Bhushan, D.1 aDesale, Girish, R.  uhttps://library.ncl.res.in/content/study-effect-impact-angle-slurry-erosion-wear-four-different-ductile-materials01551nas a2200145   4500008004100000245011300041210006900154260000800223300001500231490000700246520096900253100002901222700002301251856013101274       2019                        eng d00aExperimental investigation on performance of helical spring lock washer under different operating conditions0 aExperimental investigation on performance of helical spring lock  cJUL  a992–10000 v193 a<p>In mechanical systems, emphasis has been given to the selection and health monitoring of both bolt and nut in the bolted joint assembly; less attention has been given to the performance of spring washers due to tightening torque, usage duration and reuse. In the present experimental investigation, the load–deflection characteristics of helical spring lock (HSL) washer during compressive loading and unloading are determined using newly designed and developed test rig. Also, the load–deflection characteristics of the HSL washers are examined for reuse cycles. Additionally, the effect of compressive loading and unloading on the reaction load within elastic limit is determined. Further, the loss of helix height due to compressive loading and its effect on strain energy is examined. The tests have evidenced of loss of helix height and strain energy of HSL washer due to compressive loading which deteriorates its functionality in further usage.</p>
1 aWagh, Hemant, Krishnarao1 aDesale, Girish, R.  uhttps://library.ncl.res.in/content/experimental-investigation-performance-helical-spring-lock-washer-under-different-operating