Ujendra Kumar Komal
@iitr.ac.in
Department of Mechanical and Industrial Engineering
Indian Institute of Technology Roorkee
Ujendra Komal currently works at the Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee. Ujendra does research in Manufacturing Engineering, Materials Engineering and Mechanical Engineering. Their current project is 'Characterization, Processing and Degradation of Polymer Based Green Composites.
RESEARCH INTERESTS
Composite Materials, Polymer Composites, Natural Fibers, Natural Fiber Reinforced Composites, Recycling and Degradation of Polymer Composites, Mechanical Behavior of Advanced Materials
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Ujendra Kumar Komal and Inderdeep Singh
Informa UK Limited
Manish Kumar Lila, Ujendra Kumar Komal, Yashvir Singh, and Inderdeep Singh
Informa UK Limited
Increased ecological awareness, as well as stringent laws and legislation by government agencies, have restricted the use of synthetic fibers as reinforcement. This cognizance shifted the interest ...
Ujendra Kumar Komal, Bal Kishan Kasaudhan, and Inderdeep Singh
Springer Science and Business Media LLC
In the present experimental investigation, the specimens were fabricated using 3D printing (fused deposition modeling) and injection molding techniques. The process parameters were optimized to fabricate the good quality polylactic acid (PLA) specimens as per ASTM standards. The effect of variation (80, 90, and 100%) of the infill density on the mechanical performance of developed specimens was analyzed. The mechanical behavior of the fabricated specimens was compared in the context of tensile, flexural, and impact properties. The thermal stability and crystallinity of the PLA specimens have been investigated using thermogravimetric and XRD analysis, respectively. After tensile testing, the surface of the fractured specimens was observed using a scanning electron microscope. The tensile and flexural strength of the 3D-printed specimens was superior to the injection-molded specimens. An improvement in stiffness of the 3D-printed specimens has been observed. Moreover, the printed specimens showed better thermal stability than the molded specimens. There was no significant variation in the crystallinity of the printed and molded specimens. It can be concluded that the tensile, flexural, and thermal responses of the 3D-printed specimens are better than injection-molded specimens at the optimal combination of process parameters.
Manish Kumar Lila, Ujendra Kumar Komal, and Inderdeep Singh
Elsevier BV
Abstract The current experimental investigation is focused on the thermal post-processing of bagasse fibers based polypropylene composites. Bagasse fiber-based polypropylene composite with different fiber weight fractions (10, 20 and 30%) have been fabricated using extrusion injection molding process. Subsequently, the specimens have been exposed to temperature below their softening point for different time duration. The effect of thermal post-processing has been compared with neat polypropylene specimens subjected to similar conditions. A significant increase in mechanical as well as crystalline properties has been observed in neat polypropylene and composite specimens, but the increment reduces with an increase in fiber reinforcement as well as time. This may be attributed to the poor thermal conductivity of natural fibers. The fracture behaviour is analyzed using scanning electron microscopy, which also confirms the enhanced interfacial adhesion between fibers and matrix after exposure of the composite specimens to elevated temperature.
Ujendra Kumar Komal, Manish Kumar Lila, and Inderdeep Singh
Informa UK Limited
Ujendra Kumar Komal, Vivek Verma, Tarachand Ashwani, Nitin Verma, and Inderdeep Singh
Informa UK Limited
ABSTRACT The current research endeavor, explores the thermal, mechanical, and degradation behavior of alkaline treated banana fibers reinforced polypropylene composites. Composites incorporating BF (20% w: w) treated with NaOH (5% w: v) aqueous solution were developed using extrusion-injection molding processes. After chemical treatment, the tensile, flexural and impact strength of the composite increases by 3.8%, 5.17%, and 11.50%, respectively. Scanning electron microscope (SEM) observations of tested specimens confirm the fiber pull out and fiber fracture as the main reasons for failure of developed composites under tensile and impact loading. The specimens were exposed to two different environments, water immersion and soil burial for 5 weeks for the degradation studies. The degradation behavior of composites was measured in terms of variation in weight and mechanical properties (tensile, flexural, and impact). The maximum degradation in mechanical properties was observed for the composites buried under soil. The composite lost 7.69%, 12.06%, and 3.27% of tensile, flexural, and impact strength, respectively.
Ujendra Kumar Komal, Manish Kumar Lila, and Inderdeep Singh
Elsevier BV
Abstract In the present experimental investigation, biocomposites based on short banana fiber (20 wt%) and poly-lactic acid were fabricated using three different processing techniques, namely direct injection molding (DIM), extrusion injection molding (EIM) and extrusion compression molding (ECM). The thermal and mechanical characterization as well as dynamic mechanical analysis has been performed to understand and compare the performance of the developed biocomposites. FTIR analysis has been conducted to investigate the presence and type of interfacial interaction in the biocomposites. XRD analysis was conducted to investigate the structure and to measure the crystallinity of the biocomposites. A significant improvement in the mechanical (tensile and flexural properties), dynamic mechanical properties (storage modulus, loss modulus, and tan delta) and crystallinity of the biocomposites fabricated by EIM were observed. A novel approach was used to examine the orientation and distribution of the fibers within the developed biocomposites. The fiber damage in terms of breaking, bending, twisting and formation of the clusters have been observed. Scanning Electron Microscopy (SEM) analysis revealed that the fiber pull-out and fracture are dominating the failure of biocomposite under loading.
Manish K. Lila, Ujendra K. Komal, and Inderdeep Singh
Wiley-VCH Verlag GmbH & Co. KGaA
Ujendra K. Komal, Manish K. Lila, Saurabh Chaitanya, and Inderdeep Singh
Wiley-VCH Verlag GmbH & Co. KGaA
Hitesh Sharma, Ujendra Kumar Komal, Inderdeep Singh, Joy Prakash Misra, and Pawan Kumar Rakesh
Springer Singapore
Ujendra Kumar Komal, Hitesh Sharma, and Inderdeep Singh
Springer Singapore
Manish Kumar Lila, Kartikeya Shukla, Ujendra Kumar Komal, and Inderdeep Singh
Elsevier BV
Abstract Ageing behavior is one of the crucial factor for selection of material by designers and engineers, mainly for structural applications. Investigation of the ageing effect on biocomposites would supplement current knowledge and may help in encouraging their uses in real life applications. The current experimental investigation aims to determine the variation in various properties of Bagasse fibers reinforced Poly Lactic Acid (PLA) biocomposites during accelerated thermal ageing. Specimens of biocomposite were fabricated and exposed to temperature cycles of −20 °C and 65 °C (12 h each) for 12 weeks and characterized after every 4 weeks of exposure. Tensile and flexural properties exhibited steady improvement on exposure up to 8 weeks, followed by a reduction after ageing for 12 weeks. It can be concluded from X-ray diffraction (XRD) and dynamic mechanical analysis (DMA) that significant change in crystalline and glass transition behavior happens during the exposure period.
Deepika Singh, Vikas Kumar, Ekta Yadav, Neha Falls, Manvendra Singh, Ujendra Komal, and Amita Verma
Institution of Engineering and Technology (IET)
Facile green synthesis of silver nanoparticles (AgNPs) using an aqueous extract of Carissa carandas (C. carandas) leaves was studied. Fabrication of AgNPs was confirmed by the UV-visible spectroscopy which gives absorption maxima at 420 nm. C. carandas leaves are the rich source of the bioactive molecules, acts as a reducing and stabilising agent in AgNPs, confirmed by Fourier transforms infrared spectroscopy. The field emission scanning electron microscope revealed the spherical shape of biosynthesised AgNPs. A distinctive peak of silver at 3 keV was determined by energy dispersive X-ray spectroscopy. X-ray diffraction showed the facecentred cubic structure of biosynthesised AgNPs and thermal stability was confirmed by the thermogravimetric analysis. Total flavonoid and total phenolic contents were evaluated in biosynthesised AgNPs. Biosynthesised AgNPs showed free radical scavenging activities against 2, 2-diphenyl-1-picrylhydrazyl test and ferric reducing antioxidant power assay. In vitro cytotoxicity against hepatic cell lines (HUH-7) and renal cell lines (HEK-293) were also assessed. Finally, biosynthesised AgNPs were scrutinised for their antibacterial activity against methicillin-resistant Staphylococcus aureus, Shigella sonnei, Shigella boydii and Salmonella typhimurium. This study demonstrated the biofabrication of AgNPs by using C. carandas leaves extract and a potential in vitro biological application as antioxidant, anticancer and antibacterial agents.
Ujendra Kumar Komal, Vivek Verma, Tarachand Aswani, Nitin Verma, and Inderdeep Singh
Elsevier BV
Abstract Composite materials have gained popularity in various high-performance applications such as aerospace and automotive industry. The rising concern about the environmental issues and the need for more versatile composite materials have led to an increase in research interest regarding advanced composite materials using natural fibers as reinforcement. The objective of the present research endeavor is to investigate the effect of chemical treatment on the mechanical properties of Banana fiber (BF) reinforced polypropylene (PP) composites. Thermal properties of treated and untreated fibers have been examined using thermo-gravimetric analysis (TGA). Composites incorporating Banana fiber (10, 20 and 30% w: w) treated with NaOH (5% w: v) aqueous solution were developed. The extrusion-injection molding technique was used to fabricate the composite specimens. The mechanical properties of developed composites have been investigated and compared. Scanning electron microscope (SEM) analysis of tensile tested specimens has been carried out to investigate the fracture behavior of the developed composites. A significant improvement in mechanical properties revealed that the developed composites have great potential to be used in numerous engineering applications.
Deepika Singh, Manvendra Singh, Ekta Yadav, Neha Falls, Ujendra Komal, Deependra Singh Dangi, Vikas Kumar, and Amita Verma
Royal Society of Chemistry (RSC)
In hepatocellular carcinoma (HCC), primary liver cancer is primarily responsible for inflammation-related cancer as more than 90% of HCCs emerge with regard to hepatic damage and inflammation.
Inderdeep Singh, J. Kumar, and U.K. Komal
CRC Press
Inderdeep Singh, U.K. Komal, and M.K. Lila
CRC Press