基于相场耦合内聚力模型的身管镀层剥落数值模拟  

Numerical Simulation of Coating Spalling on Barrel Based on Phase-field Coupled Cohesive Force Model

作　　者：高健 邹利波 于存贵[1] GAO Jian;ZOU Libo;YU Cungui(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;College of Mechatronics Engineering,North University of China,Taiyuan 030051,Shanxi,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094 [2]中北大学机电工程学院,山西太原030051

出　　处：《兵工学报》2024年第11期4081-4093,共13页Acta Armamentarii

基　　金：山西省基础研究青年科学基金项目(202203021222037)。

摘　　要：身管武器在使用过程中其内膛镀层会发生剥落现象,缩短身管武器使用寿命,该现象的机理尚未明确。为研究身管武器内膛镀层剥落现象,提出一种相场耦合内聚力模型的数值模拟方法。考虑到相场具有的连续介质力学特性在裂纹扩展模拟中的优越性以及内聚力模型在多相材料界面损伤模拟中的普遍适用性,针对身管武器镀层和基体内部的裂纹扩展行为使用相场进行模拟,而针对基体和镀层界面的损伤使用内聚力模型进行模拟。针对裂纹在界面处发生偏转的现象,开展一条裂纹和两条裂纹发生扩展的有限元仿真,并与试验结果进行对比;研究镀层存在多条裂纹时不同裂纹间距对界面损伤的影响;此外还讨论了相场特征长度对裂纹扩展行为的影响。研究结果表明:当裂纹扩展至基体和镀层界面时会转而沿界面向两侧扩展,最终演化为界面失效;当多条裂纹扩展至界面处时,界面损伤主要发生在多条裂纹之间的区域,最终演化为镀层剥落;裂纹间距对界面的初始损伤和界面损伤发展速度存在影响;新提出的相场耦合内聚力模型的数值模拟方法可以作为研究身管镀层失效机理的计算方法。The coating on the inner chamber may peel off during the use of barrel,shortening the service life of barrel weapon.The mechanism behind this phenomenon is not yet clear.To study the phenomenon of coating peeling in the barrel of barrel weapons,A numerical simulation method for the phase-field model(PFM)coupling with the cohesive zone model(CZM)is proposed.Considering the superiority of continuous medium mechanical properties of PFM in crack propagation simulation and the universal applicability of CZM in multiphase material interface damage simulation.PFM is used to simulate the crack propagation behaviors inside the coating and substrate,while CZM is used to simulate the damage at the interface between the substrate and the coating.The finite element simulation is made for one crack and two cracks propagating at the interface to address the phenomenon of crack deflection,and the simulated results are compared with experimental data.The effects of different crack spacings on interface damage are studied,and the influence of phase-field characteristic length on crack propagation behavior is also discussed.The research results show that,when the crack extends to the interface between the substrate and the coating,it will turn to propagate to both sides along the interface,and eventually making the interface be failure;when multiple cracks propagate to the interface,the interface damage mainly occurs in the area between the multiple cracks,ultimately evolving into coating peeling.The crack spacing has an impact on the initial damage and the development rate of interface damage.The proposed numerical simulation method of the phase field coupled cohesive force model can serve as a computational method for studying the failure mechanism of barrel coatings.

关 键 词：身管武器 镀层 相场方法 内聚力模型 有限元模拟 

分 类 号：TJ303.1[兵器科学与技术—火炮、自动武器与弹药工程]