www.ijsetr.com ISSN 2319-8885 Vol.06,Issue.05 February-2017, Pages:0808-0817 Copyright @ 2017 IJSETR. All rights reserved. Characterisation and Analysis of Surface Stresses in Coatings AKV PHANEENDRABABU 1 , P H V SESHA TALPA SAI 2 ¹PG Scholar, Dept of Mechanical (Machine Design), Malla Reddy College of Engineering and Technology, Maisammaguda, Secunderabad, Telangana, India, Email: [email protected]. 2 Assistant Professor, Dept of Mechanical, Malla Reddy College of Engineering and Technology, Maisammaguda, Secunderabad, Telangana, India. Abstract: In the present work finite element model of surface coating model was developed to investigate tensile stresses in the surface of coatings under single particle impact, simulating particulate erosion conditions. Erosion resistant ability of coating was measured in terms of peak value of surface stress (tensile stress) in the coating. Nine different coating architectures were analyzed with different layer thickness and material properties. It may be suggested that the top layer of coating should be thin and bond layer should be thick to minimize tensile stress on coating surface which, in turn, improves erosion resistance ability of coating. It is also suggested to keep lesser value of young’s modulus of coating to minimize tensile s tress on surface thus improving its erosion resistance. Thermo mechanical analysis is also performed to find out residual stresses and time dependent temperature distribution. Keywords: Substrate, Cover, Bonding. I. INTRODUCTION Solid particle erosion (or erosive wear) implies the removal of material from component surfaces due to successive pact of hard particles travelling at substantial velocities. Material removal due to solid particle erosion is a consequence of a series of essentially independent but similar impact events. Thus, the contact between the hard particles and the component surface is of a very short duration. The erosion is completely different from the other closely related processes like sliding wear, abrasion, grinding and machining processes. Identifying the variables that influence erosion so that adequate prevention schemes can be adopted or, in order to harness the full potential of erosion was done in most of investigated cases. Surface coating often play a major role in prevention of erosion. Polymeric coatings are used to protect composite structures from rain and solid particle erosion. Polyurethane elastomers are being used as wear-resistant materials to replace traditional metallic or ceramic materials in the mineral and mechanical industries. The objective of the present work is to characterize the composite material with respect to stress developed with surface coatings of different materials and to determine thermo-mechanical properties of the composites. Mechanisms of Erosion Damage: Liquid Impact- The free fall category refers to falling rain, impacting porous soil and causing ground erosion. Solid Impacts on Ductile Materials- Removal of material by solid particle impact is perhaps the most pervasive of the erosion processes due to growing utilization of coal in fine particulate form. Impacts on Brittle Materials: The erosion of ceramics, glasses, and thermosetting polymer matrices in composite materials by solid Impact is receiving increased emphasis because ceramics and composites. Surface coating Material Models: To modify and improve the surface properties of materials for protection in demanding contact conditions and for enhanced functional performance surface coating material models are widely used for many investigation cases. In present work the surface coated model consists of top layer as cover of stainless steel material, middle layer as bonding of titanium material and bottom layer as substrate of tin material is considered for single particle impact analysis. It is proposed that the top layer of coating should be thin and bond layer should be thick to minimize tensile stress on coating surface which in turn, improves erosion resistance ability of coating. It is also proposed that to keep lesser value of Young’s modulus of
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