Heat transfer process significantly affects the life span of gun barrels as it directly associates to the thermoelastic dynamic responses, erosion, and wears of gun barrels. The previous studies regarding the heat transfer in gun barrels were developed in the realm of that is expressed by partial differential equations with the condition of smoothly distributed physical fields, and have rarely studied the cracked gun barrels. However, on one hand, due to manufacturing errors, there inherently exists fractures in realistic gun barrels; on the other hand, the inner wall of the gun barrel wears due to the high-temperature and -speed burning gas generated during the interior ballistic process, as well as the high-speed friction from projectile’s movement, which severely lead more cracks and damages. Therefore, it is of great importance to investigate the heat transfer in cracked gun barrels. In this paper, a heat transfer model for cracked gun barrels is formulated via the bond-based peridynamics. The governing equation is presented in the manner of integration, such that the heat process with the influence of cracks can be readily captured. Numerical results show that the heat energy severely accumulates on the crack surface and as the size of horizon increases, the non-local characteristics of the heat transfer appear to be more pronounced, resulting in a stiffer thermal response.

中文翻译：

---

裂纹枪管传热研究

传热过程显着影响枪管的使用寿命，因为它直接与枪管的热弹性动态响应、侵蚀和磨损相关。以往关于枪管传热的研究都是在光滑分布物理场条件下用偏微分方程表达的，而对有裂纹的枪管传热研究很少。然而，一方面，由于制造误差，现实的枪管本身就存在断裂；另一方面，由于内弹道过程中产生的高温高速燃烧气体以及弹丸运动时的高速摩擦，导致枪管内壁磨损，严重导致更多的裂纹和损坏。 。因此，研究裂纹炮管内的传热情况具有重要意义。在本文中，通过基于键的近场动力学建立了裂纹枪管的传热模型。控制方程以积分的方式呈现，可以很容易地捕捉到裂纹影响下的热过程。数值结果表明，热能在裂纹表面严重积累，并且随着层位尺寸的增加，传热的非局部特征变得更加明显，导致热响应更加僵硬。