Prof. SONG Ye | Publications & Academic Profile | SinoTechIntel

Research Publications & English Decoded Briefs

Showing 3 publications

Railway Engineering Science (铁道工程科学)•2026•DOI: 10.1007/s40534-025-00419-y

Multiscale Investigation on Fatigue Crack Growth and Remaining Useful Life of Bogie Frame Materials Under Service-Induced Damage

This study quantifies the degradation of fatigue crack growth (FCG) resistance in high-speed train bogie frame materials after long-term service. Full-scale frame fatigue tests, multiaxial FCG experiments, and finite element simulations were integrated to determine equivalent crack loading conditions. Digital image correlation captured surface displacement fields for stress intensity factor calculation. Comparative testing of as-welded (AW) and base metal (BM) regions before and after service revealed substantial reductions in remaining useful life: 70.54% for AW and 22.31% for BM. Crack-tip strain responses increased by more than twofold in AW and 1.44 times in BM after service, indicating diminished crack growth resistance. Microscopic fracture surface analysis showed more secondary cracks, unstable crack paths, and blurred fatigue striations in post-service materials, particularly in the AW region. Phased array ultrasonic testing detected no macroscopic defects, yet microstructural deterioration was evident. These findings establish a quantitative link between service-induced damage and fatigue performance degradation, supporting region-specific residual life assessment strategies for bogie frames. The experimental protocol, grounded in actual service loading spectra, improves the accuracy of remaining useful life prediction and provides a reliable basis for maintenance decision-making in high-speed rail operations.

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Journal of Central South University•2026•DOI: 10.1007/s11771-026-6282-6

Analytical prediction for lateral deformation of internal braced diaphragm wall in foundation pit based on plate theory

Current analytical methods for predicting the lateral deformation of diaphragm walls require complex calculation processes, including numerous parameters with uncertain accuracy, which are difficult to use in practical engineering applications. In this study, we propose a novel analytical approach for calculating diaphragm wall deformation. First, a differential element moment balance method for calculating earth pressure is proposed using a simplified calculation. The excavation effect on the sliding wedge and multiple factors of the ground were considered. Subsequently, the work performed by the earth pressure and internal support structure was calculated. Based on plate theory, a calculation model for the diaphragm wall deformation was established, accounting for the interaction between the ground and internal support structure. Finally, the analytical model was solved using the principle of minimum potential energy and the Ritz method. The proposed method was validated by comparing field measurement data with numerical simulations. A parametric study was conducted to explore the sensitivities of the influencing factors on the lateral deformation of the diaphragm wall, from which a design scheme for the diaphragm wall was presented under the given deformation control standard.

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New Carbon Materials (新型炭材料)•2025•DOI: 10.1016/S1872-5805(NCM2026-41-03-06)

Janus carbon shells with inner–outer functional asymmetry enable local proton enrichment for promoting CO2 methanation

Exploring non-copper electrocatalysts for CO2-to-CH4 electrosynthesis is important for reducing overreliance on copper and broadening the catalyst landscape. We report a strategy that enables CH4 formation on cobalt phthalocyanine (CoPc) by regulating the local reaction microenvironment through the catalyst structure. Ultrathin hollow carbon nanospheres (HCNs) with a uniform size were synthesized and used as supports for CoPc, forming “Janus carbon shells” with inner–outer functional asymmetry. The resulting CoPc-HCN hybrid had a maximum CO2-to-CH4 selectivity of 15.1%, overcoming the conventional CO-selective behavior of CoPc. Mechanistic studies show that the hollow carbon structure induces a proton enrichment outside the shell through an inner–outer surface interaction. The inner carbon surface promotes the hydrogen evolution reaction (HER) and produces a proton-enriched environment near the CoPc-active outer surface, thereby enabling CO2 methanation. This work highlights the critical role of catalyst structure in overcoming intrinsic selectivity limits of molecular catalysts.

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