http://hdl.handle.net/2440/10692 Thu, 27 Feb 2020 11:51:50 GMT 2020-02-27T11:51:50Z http://hdl.handle.net/2440/121894 Title: Study of effective parameters on wear behavior of rubbers based on statistical methods Author: Hakami, F.; Pramanik, A.; Islam, N.; Basak, A.; Ridgway, N. Abstract: This study investigates the wear, surface roughness, and temperature buildup (TBU) of styrene butadiene rubber (SBR), natural rubber (NR), and nitrile butadiene rubber (NBR) while sliding over abrasives of different sizes with the variation of normal load. Rubber properties such as tensile strength (s) and elongation at break (e) were considered as input parameters. Individual, as well as interacting effects of different parameters, were analyzed in‐depth by using statistical methods. Overall wear of rubber depends not only on the tribological system but also on mechanical properties that contribute different wear mechanisms in addition to abrasion. The abrasive particle size and 1/(se) are the first and second most significant contributing factors, respectively, to all output parameters except the wear rate where the second contributing factor is the applied load and abrasive size is the highest contributor. Larger abrasive particles deepen ploughing marks, which is enhanced by the higher load, and lead to higher surface roughness. The effect of load on TBU is negligible because of the soft nature of the rubber material. Tue, 01 Jan 2019 00:00:00 GMT http://hdl.handle.net/2440/121894 2019-01-01T00:00:00Z http://hdl.handle.net/2440/121292 Title: Milling of nanoparticles reinforced Al-based metal matrix composites Author: Pramanik, A.; Basak, A.; Dong, Y.; Shankar, S.; Littlefair, G. Abstract: This study investigated the face milling of nanoparticles reinforced Al-based metal matrix composites (nano-MMCs) using a single insert milling tool. The effects of feed and speed on machined surfaces in terms of surface roughness, surface profile, surface appearance, chip surface, chip ratio, machining forces, and force signals were analyzed. It was found that surface roughness of machined surfaces increased with the increase of feed up to the speed of 60 mm/min. However, at the higher speed (100–140 mm/min), the variation of surface roughness was minor with the increase of feed. The machined surfaces contained the marks of cutting tools, lobes of material flow in layers, pits and craters. The chip ratio increased with the increase of feed at all speeds. The top chip surfaces were full of wrinkles in all cases, though the bottom surfaces carried the evidence of friction, adhesion, and deformed material layers. The effect of feed on machining forces was evident at all speeds. The machining speed was found not to affect machining forces noticeably at a lower feed, but those decreased with the increase of speed for the high feed scenario. Mon, 01 Jan 2018 00:00:00 GMT http://hdl.handle.net/2440/121292 2018-01-01T00:00:00Z http://hdl.handle.net/2440/119302 Title: Developments of rubber material wear in conveyer belt system Author: Hakami, F.; Pramanik, A.; Ridgway, N.; Basak, A. Abstract: Regular degradation of rubbers contribute frequent maintenance of conveyer belt system. This paper investigates wear rate and mechanisms of rubber and associated influential parameters based on the information available in literature. Abrasion, fatigue and roll formation are dominate wear mechanisms that are influenced by load, sliding velocity, hardness and friction. Correlations among influential parameters and their effect on rubber wear was established in details. Archad's equation does not work for rubber wear but researchers have proposed equations similar to that. Adhesion wear forms roll in the smooth surface when tear strength of rubber is low. Wear caused by adhesion is abrasion when surface texture is harsh. Hysteresis enhances fatigue wear if the substrate asperities are round or blunt. Sun, 01 Jan 2017 00:00:00 GMT http://hdl.handle.net/2440/119302 2017-01-01T00:00:00Z http://hdl.handle.net/2440/116841 Title: Deformation of electrodeposited gradient Co/Sn multilayered coatings under micro-pillar compression Author: Kurdi, A.; Basak, A. Abstract: Compositionally modulated multilayer (CMM) Co-Sn coating were successfully deposited with the help of electrodeposition on copper substrate. The coating microstructure was homogeneous, nanostructured in nature with smooth and distinct interfaces as confirmed by SEM and TEM investigation. In this study, micro-mechanical properties of such CMM Co-Sn coatings has been investigated by means of micro-pillar compression. Micro-mechanical properties of electrodeposited monolithic sole Co and sole Sn coatings was also investigated for comparison purpose. CMM Co-Sn coating shows high flow strength of about 330 MPa, which is about 1.2 and 5 times higher than that of sole Co and sole Sn coating, respectively. Such enhanced mechanical properties are the result of intermixing of several thin Co-Sn layers to form a single broad layer to accommodate deformation of material and to minimize system’s energy as evident by detail transmission electron microscopy investigation on deformed micro-pillars. Mon, 01 Jan 2018 00:00:00 GMT http://hdl.handle.net/2440/116841 2018-01-01T00:00:00Z