SANDIP KUNAR

Dr. SANDIP KUNAR

orcid

Research Focus & Metrics

Academic Career Length

10Years (2017-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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8 February 2018 in Journal of the Electrochemical Society
Verified
Journal Article
Closed access
PDF file
SMS. Mahata
S. Mahata
SANDIP KUNARSANDIP KUNAR
SANDIP KUNAR
BBB. Bhattacharyya
B. Bhattacharyya
Micro-dimple arrays are among the basic microfeatures that plays an important role in performance and reliability enhancement of mechanical systems. The presence of micro-dimples on the workpiece surfaces has been known to have positive impact on the friction control and wear resistance of sliding surfaces. Although several manufacturing processes have been employed to generate micro-dimples on the workpiece surfaces, it is still a challenge to generate micro-dimples utilizing a low-aspect-ratio mask by Through Mask Electrochemical Micromachining (TMEMM). In this paper, AZ-4903 is introduced as a mask due to its availability, low cost as well as chemical resistance. A novel approach of TMEMM is proposed in which very thin masks were used for generation of micro-dimple arrays. Experiments were conducted to study the influence of duty ratio on the machining accuracy and surface properties of the generated micro-dimples. Micro-hole array with an average diameter of 65 μm imprinted on the mask are successfully replicated over SS304 substrate with considerable repeatability. Micro-dimple arrays measuring an undercut of 29.15 μm, depth 32.15 μm and 0.091 μm Ra was successfully fabricated in this study. Moreover, friction test results show that surfaces possessing appropriate micro-dimple array are highly beneficial in reducing frictional co-efficient as compared to smooth surfaces.

8 November 2018 in Materials and Manufacturing Processes
Verified
Journal Article
Closed access
SANDIP KUNARSANDIP KUNAR
SANDIP KUNAR
BBB. Bhattacharyya
B. Bhattacharyya
Micro square pattern is the basic microfeature that can be applied to various products in different fields. The product duration and performance of textured surfaces are directly influenced by shape, size and surface quality. Maskless electrochemical micromachining (EMM) is a prominent method for producing numerous high-quality micro square patterns compared to photolithography and through-mask EMM, which are expensive and time consuming in mass production. In this paper, SU-8 2150 negative photoresist is used as a patterned tool in maskless EMM. Compared with other processes, this mask can be reused for generating many uniform micro square patterns. The maskless EMM setup consisting of EMM cell, electrode fixtures, electrical connections and vertical cross flow electrolyte system has been designed and developed indigenously for carrying out the experiments. Effects of major EMM parameters like interelectrode gap, flow rate and machining time on textured characteristics, i.e., current efficiency, length overcut, machining depth and surface roughness (Ra) are investigated during generation of micro square patterns. Arrays of 8000 micro square impressions have been fabricated during experiments. An attempt has also been made to analyze the textured characteristics on the basis of micrograph of micro square pattern for getting the best parametric combination.

1 October 2018 in Journal of Manufacturing Processes
Verified
Journal Article
Closed access
SANDIP KUNARSANDIP KUNAR
SANDIP KUNAR
BBB. Bhattacharyya
B. Bhattacharyya

1 September 2017 in Advances in Manufacturing
Verified
Journal Article
Closed access
PDF file
SANDIP KUNARSANDIP KUNAR
SANDIP KUNAR
BBB. Bhattacharyya
B. Bhattacharyya

8 March 2017
Verified
Book Chapter
Closed access
PDF file
SDS. Debnath
S. Debnath
SANDIP KUNARSANDIP KUNAR
SANDIP KUNAR
SAS. S. Anasane
S. S. Anasane
BBB. Bhattacharyya
B. Bhattacharyya

1 October 2018 in Engineering Science and Technology, an International Journal
Verified
Journal Article
Open access
SANDIP KUNARSANDIP KUNAR
SANDIP KUNAR
BBB. Bhattacharyya
B. Bhattacharyya