Modeling of the bourrelet-barrel contact problem and its application
MIAO Wei1,YIN Qiang1, QIAN Linfang1,2
1.School of Mechanism Engineering, Nanjing University of Science and Technology, Nanjing 210094, China； 2.Northwest Institute of Mechanical & Electrical Engineering, Xianyang 712099, China
Abstract：It is of great significance to study the contact phenomena between bourrelet and bore for understanding the in-bore motion of projectile. Hence, a bourrelet-barrel contact model is proposed. It is assumed that the contact stress between a bourrelet and a rifling land only varies longitudinally along the rifling. The surface of a rifling land is simplified as a spatial curve. The geometry of the bore is then described as a cage consisting of rifling lands. An algorithm is proposed for detecting the contact between the bourrelet and rifling lands. The contact stress is calculated with an analytical solution to a 2-D contact problem by spreading the projectile and barrel out in a circular direction. The Chebyshev-Gauss quadrature is adopted to calculate the contact load on the bourrelet and rifling lands because of the square-root singularity of the contact stress. The fitting method and identification method of determining the model parameters are presented. Theoretical analysis suggests that the contact stiffness between the bourrelet and bore varies with in-bore travel of the projectile. The influence of variance of the projectile mass-center on bourrelet-bore contact type and formation of wearing grooves on the bourrelet is analyzed through numerical simulations. It is found the equivalent contact point on the bourrelet does not locate at the bourrelet center or on the bourrelet edges.
收稿日期: 2023-05-17
出版日期: 2024-03-28
引用本文:
缪伟 1，尹强1，钱林方1,2. 弹丸定心部-身管接触模型及其应用[J]. 振动与冲击, 2024, 43(6): 157-170.
MIAO Wei1,YIN Qiang1, QIAN Linfang1,2. Modeling of the bourrelet-barrel contact problem and its application. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(6): 157-170.
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