# Some studies on mathematical modeling and dynamic stress analysis of a variable compression ratio diesel engine crankshaft

## K. Satyanarayana1, P. V. J. Mohan Rao2, I. N. Niranjan Kumar3

1, 2, 3Department of Marine Engineering, Andhra University (A), Visakhapatnam, 530003, India

1Corresponding author

Mathematical Models in Engineering, Vol. 4, Issue 1, 2018, p. 1-10. https://doi.org/10.21595/mme.2018.19616
Received 8 January 2018; received in revised form 3 February 2018; accepted 7 February 2018; published 31 March 2018

Copyright © 2018 JVE International Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract.

The objective of the present work is to investigate the induced stress and deformation of a crank shaft. For this purpose, Variable Compression Ratio (VCR) engine is tested at 16.5 compression ratio. Peak pressures were recorded at various crank angles. A Matlab code is generated for dynamic analysis. For structural analysis and factor of safety, a three dimensional model crank shaft was developed using solid works. Finite element analysis of AISI E4340 Forged steel and Aluminum alloy 7076-T6 materials are carried by using analysis software ANSYS. The obtained results are equivalent Von-Mises stress, total deformation and factor of safety at different crank angles for the two materials are analyzed. It is concluded that Aluminum alloy exhibits better results than forged steel.

Keywords: VCR, alloys, von-misses stress, factor of safety, dynamic analysis, Ansys.

#### Acknowledgements

We express our sincere thanks to Anil Neerukonda Institute of Technology and sciences, Visakhapatnam, Andhra Pradesh, India, for providing experimental test rig, Computerized VCR diesel engine. First Author expresses gratitude to research guides Prof. S. V. U. M. Rao, Marine Department, Andhra University and Prof. T. V. Hanumantha Rao.

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