Dr Raju Kumar Thakur
@sitrc.sandipfoundation.org
Assistant Profesor and Mechanical Engineering
Sandip Institute of Technology and Research Centre Nashik
EDUCATION
P.hD in Mechanical Engineering from Indian Institute of Technology (ISM) Dhanbad
RESEARCH, TEACHING, or OTHER INTERESTS
Industrial and Manufacturing Engineering, Ceramics and Composites, Materials Science, Polymers and Plastics
Scopus Publications
Scopus Publications
Raju Kumar Thakur, Kalyan Kumar Singh, Mahesh, and Prashant Rawat
Elsevier BV
Raju Kumar Thakur and Kalyan Kumar Singh
Elsevier BV
Raju Kumar Thakur and Kalyan Kumar Singh
Elsevier BV
Raju Kumar Thakur, Kalyan Kumar Singh, and Md. Touhid Alam Ansari
Informa UK Limited
ABSTRACT The objective of this investigation is to find out the effect of the woven glass fiber reinforced polymer (GFRP) laminates with different glass fiber densities, such as 610 GSM and 210 GSM, and manufactured by the hand layup technique, supported by compression molding on mechanical properties and abrasive water jet (AWJ) drilling responses. During the investigation, the woven GFRP with a fiber density of 610 GSM has been found to display greater flexural strength, interlaminar strength (ILSS), and tensile strength as compared to the woven GFRP with a fiber density of 210 GSM. The woven GFRP with a fiber density of 610 GSM has also displayed reduced drilling damage in the surface region and less delamination compared to the woven GFRP with a fiber density of 210 GSM. The results of both types of composites prove that the TR and JP considerably impact the delamination extent (DE) and surface roughness (SR). A decrease in the TR and an increase in the JP are primarily responsible for optimizing the desired machining performances. Finally, a FESEM analysis has been done to examine the machined surfaces’ morphology.
Raju Kumar Thakur and Kalyan Kumar Singh
Wiley
AbstractGlass fiber reinforced polymer (GFRP) composites are being increasingly used in various industries owing to their low cost, lightweight, and impressive mechanical properties. For the present study, composites were fabricated with various weight percentages of graphene nanoplatelets (GNPs), i.e., 0, 0.125, 0.25, 0.375, and 0.5 wt%, which were mixed with epoxy resin of GFRP. Characteristics such as flexural strength, interlaminar shear strength (ILSS), and tensile strength of the prepared composites were tested, which established that reinforcement of 0.25 wt% of GNPs ensures optimum properties in the composite. The GNPs, loaded with 0.375 and 0.5 wt% agglomerated, on the other hand, showed interface‐governed failure. The influence of machining factors, such as wt% of GNPs, jet pressure, and traverse rate, were also studied to assess the hole quality of the composite samples, machined by abrasive water jet (AWJ). Subsequently, machining characteristics of the GNPs loaded GFRP composites are explored in detail using AWJ drilling in terms of surface roughness (Ra), kerf angle (KA), and entry and exit delamination factor (DF). The AWJ machining outcomes demonstrated that the incorporation of GNPs significantly influences the machining response of the composites. The Ra, KA, entry, and exit DF of composite laminates reduce with advancement in GNPs loadings. In addition, the surface of the drilled holes was characterized using FESEM analysis.
Shri Narayan Agnihotri, Raju Kumar Thakur, and Kalyan Kumar Singh
Elsevier BV
Shri Narayan Agnihotri, Raju Kumar Thakur, and K.K. Singh
Elsevier BV
Raju Kumar Thakur and Kalyan Kumar Singh
Informa UK Limited
ABSTRACT Incorporation of nanofillers upto a certain weight percentage in polymeric matrix has been established to enhance the performance of composites. Machining is an integral part of any manufacturing process and the effect of machining on nanocomposites has been a subject of various studies. The present study investigates the influence of multi-walled carbon nanotube (MWCNT), spindle speed (SS), and feed rate (FR), on end milling performances, such as, delamination factor (DF) and surface roughness (Ra) by using the TOPSIS methodology. The investigation has showed that incorporation of MWCNTs in the CFRP composites optimizes the machining performances. The investigation, using multi-objective TOPSIS-based analysis of variance approach, showed that SS is the most governing factor, followed by FR and MWCNT wt%, which influence the overall performance of the composites. Field emission scanning electron microscope (FESEM) has been used to show the dispersion of MWCNT in the epoxy matrix. Improvisation on machining surface characteristics along with optimal performance parameters are accomplished successfully.
Kalyan Kumar Singh and Raju Kumar Thakur
Informa UK Limited
ABSTRACT With steadily rising expanse of the engineering sector, demand for composite materials has been growing progressively over the years. Particularly, glass fiber reinforced polymer (GFRP) composites are being increasingly applied in various industries in the aerospace, automobile, and construction sectors due to their lightweight and superior performances. The present investigation examines the effect of traverse rate, jet pressure, standoff distance, and multi-walled carbon nanotubes (MWCNT), mixed with epoxy/glass fabric nanocomposites, on abrasive water jet machining (AWJM) responses, such as kerf taper (KT), surface roughness (Ra), material removal rate (MRR), entrance and exit delamination factor (DF) by using the Taguchi approach. The study has established that the addition of MWCNT in the GFRP laminates optimizes the machining responses. The investigation, using analysis of variance approach, revealed the most dominant parameter, which influences the machining performance of the composites. A significant enhancement in AWJM responses could be attained with optimal parameters. And also validates using surface examinations.
R. K. Thakur and K. K. Singh
Springer Science and Business Media LLC
R. K. Thakur and K. K. Singh
Springer Science and Business Media LLC
R. K. Thakur, K. K. Singh, and Janakarajan Ramkumar
Informa UK Limited
ABSTRACT This paper aims to examine the influence of nanoclay as secondary reinforcement in carbon epoxy (CFRP) composite on the abrasive water jet machining (AWJM) response for the process parameters, namely, jet pressure (96 and 304 MPa), traverse rate (50, 100, and 150 mm/min), and nanoclay (0.00, 1.25, and 2.50 wt%). The most dominating parameters for AWJM response such as average surface roughness (Ra) characteristics, kerf taper (KT) formation, and material removal rate (MRR) of CFRP plates were investigated by adopting the Taguchi-based statistical method. ANOVA was utilized to obtain the influence of input factors on the process response. Traverse rate was attained as the most considerable factor for all the AWJM response. CFRP embedded with nanoclay showed relatively lower KT formation, Ra, and MRR than the CFRP laminate without nanoclay. Traverse rate with 150 mm/min showed higher Ra, KT formation and MRR compared to 50 and 100 mm/min. Jet pressure with 304 MPa showed lower Ra and KT formation while provided better MRR. The microstructure analysis of the machined surface was illustrated applying FESEM.
R.K. Thakur and K.K. Singh
Elsevier BV
R. K. Thakur and K. K. Singh
Springer Science and Business Media LLC
R.K. Thakur, K.K. Singh, and Karunesh Kumar
Elsevier BV
R.K. Thakur, K.K. Singh, and J. Ramkumar
Elsevier BV
Karunesh Kumar, K. K. Singh, and R. K. Thakur
Springer Singapore
R.K. Thakur, K.K. Singh, and J. Ramkumar
Elsevier BV
Dheeraj Sharma, K.K. Singh, and R.K. Thakur
Elsevier BV
R.K. Thakur, K.K. Singh, and Dheeraj Sharma
Elsevier BV
R.K. Thakur, Dheeraj Sharma, and K.K. Singh
Elsevier BV