Re Xia

Triply periodic minimal surface (TPMS) porous structures exhibit significant potential for industrial applications owing to their high surface area, lightweight, and tunable mechanical properties. This work explores the torsional behavior of three typical TPMS porous structures, including diamond, gyroid, and Schwarz primitive types. Monotonic torsion tests show that the torsional resistance increases with relative density. Under symmetric cyclic torsional loading, the normalized torque amplitude decreases with increasing cycles, whereas failure cycles decrease and dissipated energy increases with higher strain amplitudes. Once the strain exceeds the elastic threshold, the torque amplitude initially drops sharply and then gradually declines until fracture occurs. In asymmetric cyclic torsion tests, the fracture morphology under asymmetric torsion remains consistent with that observed under monotonic torsion. These findings contribute to a deeper understanding of the mechanical reliability of TPMS porous structures and offer guidance for their structural optimization in engineering applications.

Engineering materials commonly suffer from cumulative and irreversible damage during cyclic deformation, leading to fatigue failure. Developing materials with better fatigue resistance is imperative. This work reports a metallic glass network nanomaterial that possesses superior strain‐hardening ability. After a certain number of fatigue tests, the peak stress of the nanomaterial can even be up to four times its original value. This superior strain‐hardening ability originates from the unique plastic mechanism. During cyclic deformation, localized shear transformation zones form and develop, especially in the stress concentration regions. Ligaments crosslinked to these regions cannot sustain their original configurations and contract toward these plastic hinges, resulting in the collapse and coalescence of voids. This densification enhances the engineering stress during each cycle. The fatigue features can be altered by adjusting the cyclic frequency. Stronger strain‐hardening ability can be achieved at lower cyclic frequencies.