【作者】 雷印泽； 谢晶；

【Author】 LEI Yin-ze;XIE Jing;State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology;Explosion Protection and Emergency Disposal Technology Engineering Research Center of the Ministry of Education;Advanced Technology Research Institute,Beijing Institute of Technology;

【机构】 北京理工大学爆炸科学与技术国家重点实验室； 爆炸防护与应急处置技术教育部工程研究中心； 北京理工大学前沿技术研究院；

【摘要】 为探究冷喷涂过程中基体表面粗糙度对涂层沉积特性的影响,基于欧拉-拉格朗日耦合算法(Coupled Eulerian-Lagrangian)在有限元分析软件Abaqus/Explicit中建立了多粒子撞击基体的有限元模型,对纯铝粉末撞击铝合金基体的冷喷涂过程进行了参数化建模与数值模拟分析,得到了不同表面粗糙度基体所对应的多粒子动态变形行为,并针对应力、应变、温度、层深压力等方面对基体进行了深入对比分析。结果表明,当表面粗糙度从0.35μm提升到1.35μm,铝合金制基体表面压应力提升约8.6%,基体表面温升约为40K,较高的表面粗糙度扩大了塑性屈服的区域,这不仅能促进喷涂层的成型,同时也有利于提高基体的疲劳强度。本文所建立的多粒子沉积模型可为提升涂层整体性能的研究提供有益借鉴。更多还原

【Abstract】 In order to investigate the influence of substrate surface roughness on the characteristics of the cold spraying deposition process,the commercial finite element analysis software Abaqus/Explicit was used to simulate the cold spraying process of pure Al powder impacting on the aluminum alloy substrate.The deformation behaviors of multiple particles were achieved,and the influence of substrate roughness was discussed by comparing the stress,strain,temperature and the in-depth "residual" stress with different initial substrate roughness.The results show that when the surface roughness increases from 0.35μm to 1.35μm,the compressive stress on the substrate surface rises by about 8.6%,and the temperature of the substrate surface elevates by roughly 40K.A higher surface roughness enlarges the plastic yield area of the substrate surface,which can not only promote the formation of the coating,but also improve the fatigue strength of the substrate.The multi-particle model established in this work could be a useful reference for the study of the overall properties of coatings.更多还原