Surface Technology (表面技术)•2026•DOI: 10.16490/j.cnki.issn.1001-3660.2026.09.005
Polishing of BK7 optical glass suffers from rapid tool wear, low material removal rates, and unstable surface quality. This study introduces an internal-configuration optimization strategy for flexible polishing tools based on I-graph-wrapped package (IWP) triply periodic minimal surface unit cells. Two complementary architectures—skeletal lattice (IWP-1) and perforated lattice (IWP-2)—were fabricated via stereolithography (SLA) photocuring additive manufacturing at Shore A hardness levels of 35 A and 60 A. A corrected material removal function was developed by coupling Hertzian contact theory, the Preston equation, and effective abrasive count, with elastic-plastic deformation analysis of individual grains. Static finite element analysis revealed that IWP topologies homogenize contact pressure and reduce stress concentration. CFD-DPM/DEM fluid-structure interaction simulations showed that internal channels and surface depressions enhance slurry supply, circulation, and abrasive spatial distribution. Orthogonal polishing experiments (three factors, three levels) identified optimal parameters: IWP-1 at 2 mm compression and 60 A hardness achieved Ra = 0.033 μm, suitable for final polishing; IWP-2 at 2 mm compression and 35 A hardness achieved Ra = 0.075 μm with a material removal rate ηMRR = 0.0558 mm³/min, suitable for pre-polishing. These results demonstrate a tunable balance between removal efficiency and surface quality, providing a structural design framework for non-Newtonian hydrodynamic polishing of hard-brittle optical components.
Int. Journal of Mining Science and Technology (采矿与安全工程)•2026•DOI: 10.1016/j.ijmst.2026.01.003
Cemented rockfill (CRF) combines structural support with sustainable reuse of coal-derived solid waste. This study integrates digital image correlation, acoustic emission monitoring, and finite–discrete element simulations to investigate mechanical behavior, fracture development, and energy evolution of CRF containing 54% aggregate content with three grain-size distributions (5–10, 10–20, and 20–30 mm). Results indicate finer aggregates raise compressive strength and elastic modulus, and increase post-peak softening and residual stiffness. Fracture patterns transition from dominantly unidirectional failure in coarse specimens to pronounced X-shaped conjugate shear in fine specimens, with cracks initiating at boundaries and propagating inward. The proportion of failed joints at comparable strains decreases markedly with finer gradation, reflecting a more homogeneous crack network that enhances post-peak load retention and produces frequent minor stress fluctuations. Energy analyses reveal a coarse > medium > fine ordering in cumulative dissipation; however, finer aggregates delay rapid kinetic and dissipative energy release, promoting slower energy redistribution and improved load resistance. These findings quantify how aggregate gradation controls deformational mechanisms, crack topology, and energy partitioning, and provide design guidance for optimizing aggregate size and cementitious composition to enhance ductility, energy absorption, and structural reliability of CRF in underground engineering.
Int. Journal of Minerals, Metallurgy and Materials (矿物冶金与材料学报)•2025•DOI: 10.1007/s12613-025-3127-5
The extreme removal of SiO2 and MnO inclusions in 304 stainless steel in supergravity fields was investigated using an in-house high-temperature supergravity equipment. The influences of the gravity coefficient and separation time on the removal efficiency of the inclusions were studied. After supergravity treatment, the inclusions migrated to the top of the sample and formed large aggregates. Meanwhile, the lower part of the sample was purified considerably and appeared significantly cleaner than the raw material. At the gravity coefficient of 500 and separation time of 600 s, the total oxygen content at the bottom of the sample (position E) decreased from 240 to 28 ppm. This corresponded to a total oxygen removal rate of 88.33%. The volume fraction and number density of inclusions exhibited a gradient distribution along the supergravity direction, with values of 8.5% and 106 mm–2 at the top of the sample (position A) and 0.06% and 22 mm–2 at its bottom.