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<p>Syntactic foams (SFs) fabricated by incorporating hollow particles into matrices usually have&#xa0;a higher specific mechanical properties than traditional foams. However, the initial defects such as structure or strength mismatch inside SFs significantly affect its failure response and energy absorption performance. The influence of initial structure factors is valuable to analyzed for material design with higher mechanical properties. This study developed a numerical simulation of large compression deformation behavior of a syntactic foam with hierarchical cell structure based on ANSYS/LS-DYNA commercial software. The numerical simulation was verified by the comparison of experimental results. Subsequently, influence and induction mechanisms of matrix strength, micro-defects within matrix and particles accumulation on the macroscopic failure mechanism of the syntactic foam were investigated. Research results indicate that, under impact loading, particle slip and compression deformation emerge are the dominated initial failure modes of the syntactic foam when the matrix strength is comparable to that of the cenosphere particles. Defects in both longitudinal and inclined directions of the cenosphere and matrix significantly reduce material strength and lead to the earliest fragmentation of the particles. Regardless of the presence or absence of initial structural defects, strong matrix restrains particle slip, increases stress concentration and crushing potential of filling particles, thereby increasing the possibility of global shear failure. In summary, to improve the sustained load-bearing capacity of syntactic foams, the evolution of shear deformation zones should be mitigated through methods such as particle gradation, density gradients, and reinforced phases.</p>

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Numerical Simulation Study on Impact Failure Behavior of Syntactic Foam by Using a Fluid–Structure Interaction Method

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Bingbing Zhang,
  • Huabo Li,
  • Yaozhou Li,
  • Chunyan Li,
  • Yang Li

摘要

Syntactic foams (SFs) fabricated by incorporating hollow particles into matrices usually have a higher specific mechanical properties than traditional foams. However, the initial defects such as structure or strength mismatch inside SFs significantly affect its failure response and energy absorption performance. The influence of initial structure factors is valuable to analyzed for material design with higher mechanical properties. This study developed a numerical simulation of large compression deformation behavior of a syntactic foam with hierarchical cell structure based on ANSYS/LS-DYNA commercial software. The numerical simulation was verified by the comparison of experimental results. Subsequently, influence and induction mechanisms of matrix strength, micro-defects within matrix and particles accumulation on the macroscopic failure mechanism of the syntactic foam were investigated. Research results indicate that, under impact loading, particle slip and compression deformation emerge are the dominated initial failure modes of the syntactic foam when the matrix strength is comparable to that of the cenosphere particles. Defects in both longitudinal and inclined directions of the cenosphere and matrix significantly reduce material strength and lead to the earliest fragmentation of the particles. Regardless of the presence or absence of initial structural defects, strong matrix restrains particle slip, increases stress concentration and crushing potential of filling particles, thereby increasing the possibility of global shear failure. In summary, to improve the sustained load-bearing capacity of syntactic foams, the evolution of shear deformation zones should be mitigated through methods such as particle gradation, density gradients, and reinforced phases.