Effect of Yield Criterion on Stress Distribution and Maximum Safe Pressure for an Autofrettaged Gun Barrel

Amit Bhetiwal; Sunil Kashikar; Haribhau Markale; Shailendra Gade

doi:10.14429/dsj.67.10636

Amit Bhetiwal Gun Structures Design Group, Armament Research and Development Establishment, Pune - 411 021
Sunil Kashikar Gun Structures Design Group, Armament Research and Development Establishment, Pune - 411 021
Haribhau Markale Gun Structures Design Group, Armament Research and Development Establishment, Pune - 411 021
Shailendra Gade Gun Structures Design Group, Armament Research and Development Establishment, Pune - 411 021

DOI: https://doi.org/10.14429/dsj.67.10636

Keywords: Gun barrel, Autofrettage, Residual stress, Yield criteria, Maximum safe pressure

Abstract

World artillery in the present scenario is changing its role from defensive to aggressive nature and is attempting to achieve higher penetration into enemy targets. Even for an autofrettaged gun barrel, higher ranges requirement leads to higher barrel weight and its associated demerits. The design of gun barrel is based on the choice of yield criteria. Tresca yield criterion provides conservative design for a ductile barrel material. On the other hand, more accurate von Mises criterion presents complexity. The two criteria to evaluate various parameters required for design of an autofrettaged gun barrel are compared. The methodology for evaluation of maximum safe pressure, based on von Mises criterion, for an autofrettaged gun barrel is also included in the paper. Based on case study included in the article, for an autofrettaged gun barrel or pressure vessel with uniform thickness, a theoretical weight reduction of approximately 16 per cent is feasible with von Mises criterion as compared to Tresca criterion.

Author Biographies

Amit Bhetiwal, Gun Structures Design Group, Armament Research and Development Establishment, Pune - 411 021

Mr Amit Bhetiwal, received his BE (Mechanical engineering) from VNIT, Nagpur, and MSc (Gun System Design) from Defence Academy College of Management and Technology, Cranfield University. Presently working as scientist ‘D’ in ARDE. He has more than 10 years of experience in the area of rocket launcher and gun system development. Currently he is working on the development of Advanced towed artillery gun system.

Sunil Kashikar, Gun Structures Design Group, Armament Research and Development Establishment, Pune - 411 021

Mr Sunil S Kashikar, is a graduated in Mechanical engineering, Post graduate in Industrial Engineering and completed his MSc (Gun System Design) from Defence Academy College of Management and Technology, Cranfield University. Presently working as scientist ‘E’ in ARDE. He has more than 15 years of experience in the area of weapon system development. Currently he is working on the development of advanced towed artillery gun system.

Haribhau Markale, Gun Structures Design Group, Armament Research and Development Establishment, Pune - 411 021

Mr Haribhau Markale, is a BTech (Mechanical Engineering) and MTech (Mechanical Engineering) from IIT Kanpur. Presently working as scientist ‘G’ in ARDE. He has experience in the area of sighting system and related electro-mechanical system and gun system development. Currently he is working on the development of advanced towed artillery gun system.

Shailendra Gade, Gun Structures Design Group, Armament Research and Development Establishment, Pune - 411 021

Dr S.V. Gade, received his MTec (Mechanical Engineering) from IIT Mumbai. Presently working as Scientist ‘G’ and Project Director of project ‘Advanced towed artillery gun system’ in ARDE. He has experience in the area of rocket launcher system development and in weapon system development including small arms and ammunition.