文章基本信息

标题：Kinematic and Dynamic Variations in Cam and Follower Made of Composite Material under Hygrothermal Environment
本地全文：下载
作者：Shailendra Singh ; S. Sanyal
期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2017
卷号：6
期号：3
页码：4420
DOI：10.15680/IJIRSET.2017.0603183
出版社：S&S Publications
摘要：Advancement in materials used in construction of cam and follower for reducing the weight, noise,vibration, stresses and higher strength plus rigidity for efficient and accurate operation is going on throughout the globesince long. The usual materials used for Cam and follower are steel, forged steel, alloy steel, aluminum, alloys andcomposites. Nowadays, Cam and follower mechanisms are also fabricated from Composite materials or Plastics insteadof conventionally used metals with higher specific strength and specific stiffness and thus less weight therefore lessinertia forces, stresses, deflections, vibrations and noise. The self-lubricating composite Cam- Follower system requiresno lubrication between the cam follower and rail therefore saving on grease and maintenance hence are the best choicefor clean-room operations. It is seen from the literature review that every composite material absorbs moisture underhigh temperature and high moisture condition i.e. hygrothermal environment, consequently material’s propertiesdeteriorates. Cam and Follower are also very often used in extreme atmospheric conditions i.e. high temperature andhumidity with the requirement of accuracy and precision. Due to absorption of moisture volume, mass and moment ofinertia will enhance thus kinematics and dynamics of Cam and follower mechanism will alter. Heretofore, no attempthas been made to find out Kinematic and Dynamic variations of Cam and Follower mechanism made of compositematerial under hygrothermal environment. So, this is an attempt to find out, Kinematic and Dynamic variations thatwill take place in cam and follower mechanisms made of composite material under hygrothermal environment.Degradation in the properties of composite material under hygrothermal environment is evaluated using ChamisEquation. Kinematic analysis is carried out to determine the variation in displacement, velocity and acceleration.Dynamic analysis is also carried out to find out variations in inertia force, spring forces, resultant force and torque ofthe follower for the full range of motion of cam under hygrothermal environment, made of composite material. Inkinematic analysis of cam and follower mechanism, it is observed that the displacement, velocity and accelerationchanges because of variation in pitch circle radius of cam due to hygrothermal expansion. In dynamic analysis of Camand follower mechanism under hygrothermal environment, it is observed that mass of Cam and follower increases thusinertia forces enhance which leads to enhancement in resultant forces thus higher torque. This erroneous behaviour ofCam and Follower mechanism under hygrothermal environment can be rectified by estimating exact magnitude ofvariations under hygrothermal environment and compensating it by accordingly reducing overall dimension of camand follower . So, it is obligatory that effect of hygrothermal atmosphere should be taken into consideration whileanalyzing kinematic and dynamic performance of cam and follower mechanism
关键词：Fickean diffusion; Chamis Equation; Hygrothermal effect; Kinematic variations; Epoxy resin; Cam