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33 results on '"Pu, Yongfeng"'

15. Experimental and numerical investigation on the strength of polymer-metal hybrid with laser assisted metal surface treatment

Author

Wang Zhuojun, Pu Yongfeng, Ma Fangwu, Chen Shixian, and Han Lu

Subjects
Surface (mathematics), Materials science, Oxide, 030206 dentistry, 02 engineering and technology, Surfaces and Interfaces, General Chemistry, 021001 nanoscience & nanotechnology, Polymer metal, Laser assisted, Surfaces, Coatings and Films, Finite element simulation, Metal, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, chemistry, Mechanics of Materials, visual_art, Ultimate tensile strength, Materials Chemistry, visual_art.visual_art_medium, Caustic (optics), Composite material, 0210 nano-technology
Abstract

The aim of this study was to evaluate the effect of laser assisted treating metal surface on the strength of polymer-metal hybrid. The oxide film on the metal surface was removed by caustic...

Published
2019

16. Crashworthiness analysis and multi-objective optimization for honeycomb structures under oblique impact loading.

Author

Ma, Fangwu, Liang, Hongyu, Pu, Yongfeng, Wang, Qiang, and Zhao, Ying

Subjects
HONEYCOMB structures, IMPACT loads, HONEYCOMBS, POISSON'S ratio, FINITE element method, GENETIC algorithms, CELL anatomy
Abstract

Oblique impact loading conditions are unavoidable in practical applications, which strongly influence the performance response of energy-absorbing structures. In this paper, the finite element models of four typical cellular structures (hexagon honeycomb, re-entrant hexagon honeycomb, star-shape honeycomb, double arrow honeycomb) are established and experimentally validated. The dynamic responses of four structures under different impact angles (from 0 to 30°) and impact velocities (from 5 to 50 m/s) are investigated. On this basis, the influences of impact angle and impact velocity on the specific energy absorption (SEA) and peak crushing force (PCF) of four structures are discussed. The results reveal that the negative Poisson's ratio structure has the advantage of energy absorption under axial impact due to the characteristics of compression and contraction at the low impact velocity. The hexagonal honeycomb structure has great advantages in terms of comprehensive energy absorption capacity and better stability at varying inclination angles. The Non-dominated Sorting Genetic Algorithm (NSGA-II) coupled with the ideal point method (IPM) is utilised to explore the optimal design of hexagon honeycomb structure, which is then verified by a detailed crashworthiness comparison with the original design. The optimal honeycomb structure shows excellent crashworthiness characteristics and demonstrates great potential for applications in impact engineering, especially the oblique impact loading situations. [ABSTRACT FROM AUTHOR]

Published
2022
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