A Study on the Reduction of Stress Concentration for the Breech System

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Journal of the Korea Institute of Military Science and Technology 2001;4(1):246-254.

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잠금장치의 응력집중 저감에 관한 연구

이영신, 류충현, 송근영, 김인우, 이규섭, 차기업

¹충남대학교
²한국타이어
³국방과학연구소

Abstract

The breech system can be considered as a pressure vessel with an internal plug under high explosive pressure. The system consists of a breech block(internal plug) whose front surface subjects to pressure, and a breech ring(pressure vessel). There is the geometric discontinuity around roots of connection parts and then stress concentration is introduced due to pressure, where contact effect may be ignored because contact plane between two equipments is parallel ideally, Generally high stress concentration phenomena shorten the life cycle of the mechanical system. It is well known that shock load is much more harmful on safety of the system than static load. In this present paper, several geometric design variables which may affect stress condition on the system are chosen and the parametric study on the design variables is carried using commercial FEM codes. Finally, the obtained results in the single lug breech system are applied to design the 3 lugs breech system. The 3 lugs breech system can reduce the maximum stress level.

Key Words: Breech System, Breech Block, Breech Ring, Lug, Single Lug Breech System, Multi-Lug Breech System