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\title{FEA of the Forged Steel Crankshaft by Hypermesh}
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\begin{document}

             \author[1]{Rajesh Mallikarjun  Madbhavi}

             \affil[1]{  Nimra Institute of Science and Technology, Vijayawada, AP, India}

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\date{\small \em Received: 11 December 2012 Accepted: 31 December 2012 Published: 15 January 2013}

\maketitle


\begin{abstract}
        


The main objective of the present work is to investigate Finite Element Analysis of the forged steel crankshaft.In this present research work analysis is conducted on forged Micro Alloy Steel crankshaft. This crankshaft is used in new TATA Safari 2.2 L DICOR vehicle, which belongs to in line four cylinder crankshaft of four stroke diesel engine. But crankshaft is failed for various reasons. Therefore there is need for analysis of the crankshaft to find out the reasons of its failure using the FEA analysis.In this study a static analysis is conducted on this crankshaft, with single crankpin of crankshaft. Finite element analysis is performed to obtain the variation of stress magnitude at critical locations. With the help of maximum gas pressure at time of combustion, total load acting on the crankpin of the crankshaft is calculated. In this static analysis of crankshaft, loading and boundary condition depend upon the maximum gas pressure acting on the crankpin. For the FEA analysis of crankshaft we selected the different element length size for the meshing.

\end{abstract}


\keywords{forging, forging limit diagram (FLD), hyper mesh, simulation, 3d modeling, computational analysis, stress, strain}

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\let\tabcellsep& 	 	 		 
\section[{Introduction}]{Introduction}\par
The Crankshaft Figure  {\ref 1} : Functional layout diagram of crankshaft he primary function of the crankshaft is to convert the translational mechanical energy of the piston being driven back and forth by the pneumatic energy provided by pressure change as a result of the combustion reaction. Crankshafts are high volume production engine components and their most common application is in an automobile engine. In an internal combustion engine, the reciprocating motion of the piston is linear and is converted into rotary motion through the crankshaft. There are many other applications of a crankshaft which range from small one cylinder engines to very large multi cylinder marine crankshafts. The connection of the piston to the crankshaft via the connector pin provides for the transfer of this energy; the force of the connector pin to the small portion of crankshaft axel that is offset from the main axis causes the rotation about the main crankshaft axis. The crankshaft is also connected to the pull-start by the pull-start connection cup. When the pull-start chord is pulled, the energy is transferred to rotational energy of the crankshaft. Now that the crankshaft has converted the translational mechanical energy of the piston to rotational mechanical energy, its next function is to transfer this energy to the driver pulley of the pulley-belt system. This is a critical transfer of energy because it is the belt-pulley system that ultimately displaces this rotational mechanical energy to the auger, causing it to rotate and collect the snow and other material that is imported by the auger. The flow that is associated with the crankshaft is just this energy conversion. The crankshaft is located directly adjacent to the two-cycle gas engine, since it is connected to the piston by the connector pin. This location next to the engine is a hot environment that is caused by the convection of thermal energy off of the engine block's heat sink. The high temperatures in this environment are cause for consideration when choosing the material for the crankshaft, which will be discussed in the following section, along with the geometry and appearance of the component.  
\section[{History}]{History}\par
In the past, the crankshaft was developed without using any analytical software's. So, in those days not only crankshaft, but all other products also were developed with doing various kinds of iterations in manufacturing technology. Due to which it affects the total production cost, time consumption \& all overall project cost.   
\section[{Problem Definition}]{Problem Definition}\par
For the FEA analysis of crankshaft we selected the different element length size for the meshing. Meshing is done using the HYPERMESH software. The element type used for crankshaft is solid 3D. For the analysis of crankshaft the tetra element shape is used. The static analysis is done analytically. This resulted in the load spectrum applied on crankpin of crankshaft. This load is applied to the FE model in ANSYS, and boundary conditions were applied according to the engine mounting conditions.    
\section[{Steps of Simulation for Validation}]{Steps of Simulation for Validation}\par
There are following steps followed for simulation: i. Exact defining the critical area of load acting on crankshaft. ii. Load Distribution of crankshaft. iii. Meshing of crankshaft with different shapes of element. iv. Graphical analysis for calculating critical load area. v. Target the area to minimize the load completely (i.e.\par
uniformly distributed). Finite element analyses of the crankshafts were conducted to obtain stress distributions, determine the critical location of the crankshafts and to determine the stress concentration factors. Based on the finite element analysis performed for the two crankshafts, life predictions were performed using the properties obtained from the strain-controlled specimen fatigue tests. Both the S-N and the strain-life approaches were used, results of which were then compared with the component test data.  
\section[{Experimental Set-up}]{Experimental Set-up}\par
For specimen testing, strain-controlled monotonic and fatigue tests of specimens made of the forged steel and cast iron crankshafts were conducted. From these experiments, both static as well as baseline cyclic deformation and fatigue properties of both materials were obtained. Such data provide a direct comparison between deformation, fatigue performance, and failure mechanisms of the base materials, without introducing the effects and interaction of complex design parameters such as surface finish, component size, residual stress, stress concentration, etc. ASTM standard test methods and recommended practices were followed in all tests. Charpy V-notch specimen tests were also conducted due to the occasional impact loads applied to the crankshaft.\par
A number of load-controlled fatigue tests of crankshafts made of forged steel and ductile cast iron were also conducted. Such data provide a direct comparison between fatigue performance of the components made of each base material and manufacturing process. Such comparison inherently includes design effects such as surface finish, component size, residual stress, and stress concentration. Finite element analyses of the crankshafts were conducted to obtain stress distributions, determine the critical location of the crankshafts and to determine the stress concentration factors. Based on the finite element analysis performed for the two crankshafts, life predictions were performed using the properties obtained from the strain-controlled specimen fatigue tests. Both the S-N and the strain-life approaches were used, results of which were then compared with the component test data.   
\section[{Conclusion}]{Conclusion}\par
There are some main conclusions that can be drawn from this project. The main objectives were met and even though the hope was to be able to design the crankshaft with considering torsional \& bending load, we finally reached a feasible solution. The main objective was to design the crankshaft and then evaluate if investment in simulation software would be profitable. The answer to the question if this would be profitable, as can be understood from reading the discussion, depends greatly on how We chooses to profligate. If we focus on especially advanced meshing tools, an investment in simulation software would most certainly be profitable in terms of more orders, faster and cheaper production and safer production.\par
However, if we only produce meshing tools per year, buying product externally, only when necessary, would maybe be a better option. But from a future perspective, one can expect the meshing operations to be even more complicated \& software will rise quickly as the demands on the products get higher. \begin{figure}[htbp]
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 			\footnote{© 2013 Global Journals (US)} 			\footnote{© 2013 Global Journals Inc. (US)} 		 		\backmatter  			 			 			  				\begin{bibitemlist}{1}

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\end{document}
