Author
Ankit Gupta
Other affiliations: Indian Institute of Technology Dhanbad, Tennessee Technological University, STMicroelectronics ...read more
Bio: Ankit Gupta is an academic researcher from Shiv Nadar University. The author has contributed to research in topics: Finite element method & Functionally graded material. The author has an hindex of 13, co-authored 57 publications receiving 726 citations. Previous affiliations of Ankit Gupta include Indian Institute of Technology Dhanbad & Tennessee Technological University.
Papers
More filters
••
TL;DR: In this paper, the fabrication of silicon carbide reinforced Ti6Al4V metal matrix composites (MMCs) by a direct metal laser sintering process, followed by characterization of microstructures and evaluation of mechanical properties.
Abstract: The present work deals with the fabrication of silicon carbide (SiC) reinforced Ti6Al4V metal matrix composites (MMC’s) by a direct metal laser sintering process, followed by characterization of microstructures and evaluation of mechanical properties. Variable process parameters like laser power density [3.528–5.172 W/cm2 (×104)], SiC reinforcements (5%–15% by volume), and beam scanning speed (3500–4500 mm/min) and constant process parameters such as spot diameter (0.4 mm), hatching gap (0.2 mm), and layer thickness (0.4 mm) were considered to perform the experiments. The influence of addition of reinforcements on mechanical and physical properties of fabricated samples as compared to Ti6Al4V was examined. Field emission scanning electron microscope images show good metallurgical bonding between reinforcement and matrix. The presence of intermetallic compounds formed during the sintering process was detected by x-ray diffraction, which enhances the mechanical properties of the fabricated samples. Density of sintered samples increased on the increment in laser power density but decreased with an increase in the percentage of SiC in the mixture. Mean value of coefficient of friction was found in the range of 0.157–0.115 in a testing duration of 10 min, showing improvement in the wear resistance property as compared to Ti6Al4V. The improved mechanical properties and surface characteristics result in the formation of effective MMC's for various engineering applications.
21 citations
••
TL;DR: In this paper, the numerical and experimental characterization of Functionally Graded Materials (FGMs) fabricated by the fused filament fabrication (FFF) process was investigated, and the results indicated that the gradual change in fiber reinforcement reduced the stress concentrations at the interface zone and increased the strength of neat Acrylonitrile Butadiene Styrene (ABS) properties.
18 citations
••
TL;DR: In this article, soil geomorphology, sedimentation processes, and tectonism are broadly controlled by the Himalayan tectonics in Haryana plain, and the soil-geomorphic units were grouped into six members (QIMS-I to VI) of a morphostratigraphic sequence.
Abstract: Haryana plain is the drainage divide between the Ganga plain in the east and the Indus plain in the west. Being a part of the Himalayan foreland, its geomorphology, sedimentation processes, and tectonism are broadly controlled by the Himalayan tectonics. Soil and geomorphological mapping in Haryana plain bring out geomorphic features such as paleochannels, various active drainage patterns, and landforms such as old fluvial plains, floodplains, piedmonts, pediments, terminal fans, and eolian plains. Based on the degree of soil development, and Optical stimulated luminescence (OSL) ages, the soil-geomorphic units were grouped into six members (QIMS-I to VI) (Quaternary Indus Morphostratigraphic Sequence) of a morphostratigraphic sequence: QIMS-VI 9.86–5.38 Ka, QIMS-V 5.38–4.45 Ka, QIMS-IV 4.45–3.60 Ka, QIMS-III 3.60–2.91 Ka, QIMS-II < 2.91–1.52 Ka, and QIMS-I < 1.52 Ka. OSL chronology of different geomorphic features suggests six episodes of tectono-geomorphic evolution in the region since 10 Ka. Neotectonic features such as nine faults, two lineaments, and five fault-bounded tectonic blocks have been identified. Independent tilting and sagging of the blocks in response to neotectonics have resulted in modification of landforms, depositional processes, and hydro-geomorphology of the region. Major rivers like the Yamuna, the Ghaggar, and the Sutlej show different episodes of shifting of their courses. Lineament controlled few extinct channels have been recorded between 20 and 25 m depth below the surface in the ground-penetrating radar (GPR) profiles. These buried channels are aligned along the paleo-course of the Lost Saraswati River interpreted from the existing literature and hence are considered as the course of the lost river. Seven terminal fans have been formed on the downthrown blocks of the associated faults. The Markanda Terminal Fan, the first of such features described, is indeed a splay terminal fan and was formed by a splay distributary system of the Markanda River. Association of three terminal fans of different ages with the Karnal fault indicates the segment-wise development of the fault from west to east. Also, comparison with other such studies in the Ganga plain to further east suggests that the terminal fans formed by streams with distributary drainage pattern occur only in semiarid regions as in the present area and thus are indicators of semiarid climate/paleoclimate. Though the whole region is tectonically active, the region between the Rohtak fault and Hisar fault is most active at present signified by the concentration of earthquake epicenters.
18 citations
••
TL;DR: In this paper, an integrated approach including morphometry, pedology, GPR study and OSL dating was adopted to study morphotectonics of the Gandak megafan.
18 citations
••
23 Apr 2020
TL;DR: In this paper, a vibrational study of the porous functionally graded plate with geometric discontinuities and partial supports has been presented, and the kinematics of the plate is analyzed.
Abstract: Vibrational study of the porous functionally graded plate with geometric discontinuities and partial supports has been presented in the present paper. The kinematics of functionally graded plate is...
17 citations
Cited by
More filters
••
Paris 12 Val de Marne University1, University Medical Center Groningen2, Eindhoven University of Technology3, University Hospital of Lausanne4, French Institute of Health and Medical Research5, Università Campus Bio-Medico6, University of Belgrade7, University of Cologne8, Ludwig Maximilian University of Munich9, École Polytechnique Fédérale de Lausanne10, Turku University Hospital11, University of Regensburg12, Università telematica San Raffaele13, Paris Descartes University14, Paracelsus Private Medical University of Salzburg15, University of Bern16, Universidade Nova de Lisboa17, Medical Park18, University of Göttingen19, University of Messina20, Central European Institute of Technology21, University of Siena22, University of Turku23, University of Tübingen24
TL;DR: These updated recommendations take into account all rTMS publications, including data prior to 2014, as well as currently reviewed literature until the end of 2018, and are based on the differences reached in therapeutic efficacy of real vs. sham rT MS protocols.
822 citations
••
TL;DR: The most common defects on printed parts, in particular the void formation, surface roughness and poor bonding between fibre and matrix, are explored and an inclusive discussion on the effectiveness of chemical, laser, heat and ultrasound treatments to minimize these drawbacks is provided.
Abstract: Fused deposition modelling (FDM) is one of the fastest-growing additive manufacturing methods used in printing fibre-reinforced composites (FRC). The performances of the resulting printed parts are limited compared to those by other manufacturing methods due to their inherent defects. Hence, the effort to develop treatment methods to overcome these drawbacks has accelerated during the past few years. The main focus of this study is to review the impact of those defects on the mechanical performance of FRC and therefore to discuss the available treatment methods to eliminate or minimize them in order to enhance the functional properties of the printed parts. As FRC is a combination of polymer matrix material and continuous or short reinforcing fibres, this review will thoroughly discuss both thermoplastic polymers and FRCs printed via FDM technology, including the effect of printing parameters such as layer thickness, infill pattern, raster angle and fibre orientation. The most common defects on printed parts, in particular, the void formation, surface roughness and poor bonding between fibre and matrix, are explored. An inclusive discussion on the effectiveness of chemical, laser, heat and ultrasound treatments to minimize these drawbacks is provided by this review.
355 citations
••
TL;DR: In this article, the state-of-the-art developments in the design for additive manufacturing (DfAM) and structural optimisation, becomes vital for successfully shaping the future AM-landscape.
330 citations
01 Aug 2010
TL;DR: Stereolithography is a solid freeform technique (SFF) that was introduced in the late 1980s as discussed by the authors, which has the highest fabrication accuracy and an increasing number of materials that can be processed is becoming available.
Abstract: Stereolithography is a solid freeform technique (SFF) that was introduced in the late 1980s Although many other techniques have been developed since then, stereolithography remains one of the most powerful and versatile of all SFF techniques It has the highest fabrication accuracy and an increasing number of materials that can be processed is becoming available In this paper we discuss the characteristic features of the stereolithography technique and compare it to other SFF techniques The biomedical applications of stereolithography are reviewed, as well as the biodegradable resin materials that have been developed for use with stereolithography Finally, an overview of the application of stereolithography in preparing porous structures for tissue engineering is given
319 citations
••
TL;DR: In this article, a review of the mechanism of embedding different continuous fibers into different plastics and their microstructural and mechanical properties including predicting models have been critically reviewed and based on the limitations of current technology future research directions have been defined.
272 citations