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Zhihui Zhu,Meifang Zhu 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.83 No.5
A numerical approach for dynamic stability analysis of sandwich plates has been provided using Chebyshev-Ritz- Bolotin approach. The sandwich plate with porous core has been formulated according to a higher-order plate. All of material properties are assumed to be dependent of porosity factor which determines the amount or volume of pores. The sandwich plate has also been assumed to be under periodic in-plane loading of compressive type. It will be shown that stability boundaries of the sandwich plate are dependent on static and dynamical load factors, porosity factor, porosity variation and core thickness.
Senlong Yu,Hengxue Xiang,Jialiang Zhou,Zhe Zhou,Meifang Zhu 한국섬유공학회 2018 Fibers and polymers Vol.19 No.4
The flame-retardant poly(lactic acid) (FR-PLA) fibers with different contents of modified α-zirconium phosphate (α-ZrP) and polysulfonyldiphenylene phenyl phosphonate (OP) were prepared by melt spinning. The organic modification of α-ZrP was characterized by Fourier transform infrared spectroscopy, wide angle X-ray diffraction, and thermo gravimetric analysis. The limiting oxygen index, vertical burning test, and cone calorimeter test were used to investigate the synergistic effect of OP/α-ZrP on flame-retardant property of FR-PLA, the test results suggested that the combustion of PLA fibers was efficiently inhibited by OP/α-ZrP. The results of scanning electron microscopy, Raman spectrum, and X-ray photoelectron spectroscopy indicated that the flame-retardant mechanism of OP/α-ZrP mainly depended on condensed phase. The tensile strength and morphology of FR-PLA fibers with OP/α-ZrP were better than those of fibers treated only with OP, demonstrating that α-ZrP could significantly improve the mechanical property of FR-PLA fibers.