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<p>Exploring the evolution of mechanical behavior of W-Cu composites during service in extreme environments is of key significance for guiding material design. In this paper, 2D thermal shock of W-Cu materials with different W particle size ratios was simulated via the multi-particle finite element method (MPFEM) from particulate scale, and mechanisms were revealed based on the evolution of macro and micro-properties of the material. The results indicate that at a temperature of 600 K, as the particle size ratio increases, the force chain gradually becomes loose, and the area of stress concentration in the composite material significantly decreases. The smallest deformation occurs at the composites with W particle size ratio of 2.5:1, compared with mono-sized powder, the radial and axial displacement of the W particle size ratio of 2.5:1 is reduced by 5.19% and 6.54%, respectively. When large particles intermingled with one or two small particles and connected into chains, the highest stress value generated after thermal shock can reach 280&#xa0;MPa. This model can predict the properties of W-Cu composite materials based on different scales, providing a theoretical basis for material preparation.</p>

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MPFEM Simulation of W-Cu Composites with Different W Particle Size Ratios under Thermal Shock

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Yufeng Fu,
  • Xizhong An,
  • Junnan Li,
  • Peng Han,
  • Kun Liu,
  • Jianchun Shi,
  • Yongwen Fan

摘要

Exploring the evolution of mechanical behavior of W-Cu composites during service in extreme environments is of key significance for guiding material design. In this paper, 2D thermal shock of W-Cu materials with different W particle size ratios was simulated via the multi-particle finite element method (MPFEM) from particulate scale, and mechanisms were revealed based on the evolution of macro and micro-properties of the material. The results indicate that at a temperature of 600 K, as the particle size ratio increases, the force chain gradually becomes loose, and the area of stress concentration in the composite material significantly decreases. The smallest deformation occurs at the composites with W particle size ratio of 2.5:1, compared with mono-sized powder, the radial and axial displacement of the W particle size ratio of 2.5:1 is reduced by 5.19% and 6.54%, respectively. When large particles intermingled with one or two small particles and connected into chains, the highest stress value generated after thermal shock can reach 280 MPa. This model can predict the properties of W-Cu composite materials based on different scales, providing a theoretical basis for material preparation.