Scholarlink

<p>Numerical simulation has become a crucial tool for investigating the deformation behavior and bonding mechanisms of cold spray (CS) particles. Some existing models can effectively predict the onset velocity for CS particle adhesion, but most neglect the physical process whereby unoxidized clean metal breaks through the barrier formed by surface oxide films, becomes exposed, and establishes metal-to-metal bonding under interfacial pressure. Consequently, these models fail to characterize the occurrence of localized metallurgical bonding. To achieve this goal, this study proposes a physically based interaction model implemented through Smoothed Particle Hydrodynamics (SPH) method, which separates the entire process of particle-substrate interaction into two phases. In the phase prior to clean metal exposure, contact model <Emphasis Type="BoldItalic">f</Emphasis><sub>1</sub> in form of a repulsive force simulates the interfacial contact inducing by large plastic deformation. In the phase following exposure, bonding model <Emphasis Type="BoldItalic">f</Emphasis><sub>2</sub> in form of Lennard-Jones potential simulates metal-to-metal connection established by localized metallurgical bonding. The clean metal exposure that controls the transition from <Emphasis Type="BoldItalic">f</Emphasis><sub>1</sub> to <Emphasis Type="BoldItalic">f</Emphasis><sub>2</sub> is critical, which is determined by a threshold <i>ε</i><sub><i>th</i></sub> of equivalent plastic strain. Through numerical testing of the proposed interaction model, the effects of parameters in this interaction model are thoroughly discussed, and suggestions for the values of these parameters are provided. Furthermore, the model is applied to simulations at varying impact velocities, and the calculated rebound velocity, deformation, and local bonding strength all exhibit agreement with experimental data, validating the efficacy and accuracy of the proposed model.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Physically based interaction model of cold spray particle bonding via smoothed particle hydrodynamics

  • 期刊论文

  • 发表日期：

    2025年11月7日

查看全文
  • Zhen Dai,
  • Jiayi Wang,
  • Fei Xu,
  • Wei Feng

摘要

Numerical simulation has become a crucial tool for investigating the deformation behavior and bonding mechanisms of cold spray (CS) particles. Some existing models can effectively predict the onset velocity for CS particle adhesion, but most neglect the physical process whereby unoxidized clean metal breaks through the barrier formed by surface oxide films, becomes exposed, and establishes metal-to-metal bonding under interfacial pressure. Consequently, these models fail to characterize the occurrence of localized metallurgical bonding. To achieve this goal, this study proposes a physically based interaction model implemented through Smoothed Particle Hydrodynamics (SPH) method, which separates the entire process of particle-substrate interaction into two phases. In the phase prior to clean metal exposure, contact model f1 in form of a repulsive force simulates the interfacial contact inducing by large plastic deformation. In the phase following exposure, bonding model f2 in form of Lennard-Jones potential simulates metal-to-metal connection established by localized metallurgical bonding. The clean metal exposure that controls the transition from f1 to f2 is critical, which is determined by a threshold εth of equivalent plastic strain. Through numerical testing of the proposed interaction model, the effects of parameters in this interaction model are thoroughly discussed, and suggestions for the values of these parameters are provided. Furthermore, the model is applied to simulations at varying impact velocities, and the calculated rebound velocity, deformation, and local bonding strength all exhibit agreement with experimental data, validating the efficacy and accuracy of the proposed model.