• Venkata Sushma M
• K Srinivasa Prasad

A Cannon is a large tubular firearm designed to fire heavy projectile over a considerable distance using propellant. Basically cannons are made of three liners, the inner cannon liner, which holds the explosives have greater chances to get wear out. The dimensional tolerance of its physical design and type of fit plays an important role in enhancing the longevity of the liner. To improve the life of the liner, one should have prior information of the stress levels on the liner after the shrink fit. This is done by using finite element method the cannon shrink fitting process is simulated majorly focusing on optimization of heating (temperature range) before shrink fit, structural expansion after supplying of heat, the contact behaviour on the interface in shrink fit and structural deformation after shrink fit (i.e. stress maps). Some of the inferences from the simulation are (1) By increasing the temperature, the expansion is more i.e. extended bore with required radius is obtained by imposing temperature to outer liner during heating process, (2) Once the required expansion is obtained and after fitting the inner liner, the outer layers is then squeezed in radius and extended in axial by the act of shrinking when the assembly is allowed cooled and relative amount of compression also observed after reaching temperature, (3) Stress analysis done for both perfect fit and misfit at different conditions. For perfect fit stress concentration is high at the innermost liner particularly where explosive charge is placed. But for the misfit stress concentration is maximum at the contact point of the liners. (4) Perfectly fitted cannon require more pull out load when compared to misfitted cannon and they are more reliable in avoiding the accidents during the explosive testing. The results are verified with both analytical and Experimental analysis (XRD).

Shrink fitting process simulation, Stress analysis, Interference, Perfect fit, Misfit, ANSYS, XRD.

"simulation of shrink fitting process of cannon liners for explosive testing", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 10, page no.390-395, October-2018, Available :http://www.jetir.org/papers/JETIR1810756.pdf

"simulation of shrink fitting process of cannon liners for explosive testing", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 10, page no. pp390-395, October-2018, Available at : http://www.jetir.org/papers/JETIR1810756.pdf