Dynamic Compressive Behavior and Numerical Simulation of a New Amorphous Alloy Fiber/Epoxy Composite

ABSTRACT

This paper presents systematic research on dynamic compression behavior, damage mechanisms, and energy absorption mechanisms of a new CoFeSiB amorphous alloy fiber/epoxy composite (AAFEC) under four fiber orientations (FOs) and strain rates (SRs). The results demonstrated SR sensitivity of AAFECs; their compression strength and energy absorption capacity (EAC) increase with increasing SR. The highest compressive strength and EAC were 535 MPa and 95.75 kJ/m ³ at an SR of 3313 s ⁻¹ . The appropriate increase in FO (0°–10°) can improve the EAC of the AAFEC, while it decreases for the excessive orientation (20°) due to transverse shear dominance. The highest EAC is 102.3 kJ/m ³ for the FO of 10°. Shear bands can form on the amorphous alloy fiber (AAF) surface, leading to enhanced energy absorption when transferring compressive loads. Finite element simulations (FESs) were accomplished on the AAFECs under different SRs and FOs. The stress–strain curves of the representative volume element (RVE) model were obtained through FES, and these results clearly demonstrated the damage process and damage mechanism of the AAFEC. A validated approach integrating Hopkinson pressure bar experiments and RVE simulations is established, bridging macroscopic failure patterns with microscopic damage processes. These results provide fundamental insights for designing compression‐resistant composites through AAF architecture optimization.