A high-temperature coal tar （HTCT） was sequentially extracted with petroleum ether （PE）, ethyl acetate （EA）, and acetone with ultrasonic irradiation to afford extracts 1 to 3 （El to E3）, respectively, and acet...A high-temperature coal tar （HTCT） was sequentially extracted with petroleum ether （PE）, ethyl acetate （EA）, and acetone with ultrasonic irradiation to afford extracts 1 to 3 （El to E3）, respectively, and acetone residue. The gas chromatography/mass spectrometry （GC/MS） analysis of all extracts show that E1 is mainly composed of diand tricyclic arenes such as naphthalenes, phenan- threne, anthracene, etc., whereas high contents of heteroatomic compounds and four or more ring arenes were found in E2 and E3, respectively. The pyrolysis process of acetone residue was studied with a thermogravimetric （TG） analyzer equipped with Fourier transform infrared （FTIR） spectrometer. The results indicate that volatiles were mainly released at 380-560 ℃, and the maximum mass loss rate occurred at 492 ℃.展开更多
To reduce the damage of the pressurizing panel structure of a fuselage caused by an explosion at the“least risk bomb location”in an aircraft structure,a new pre-separation panel structure was designed to resist blas...To reduce the damage of the pressurizing panel structure of a fuselage caused by an explosion at the“least risk bomb location”in an aircraft structure,a new pre-separation panel structure was designed to resist blast loading.First,the dynamic strain response and morphology of impact damage of the new pre-separation panel were measured in an impact damage test.Second,the commercial software LS-DYNA was used to calculate the propagation of the blast shock wave,and the results were compared with empirical equations to verify the rationality of the numerical calculation method.Finally,the fluid–structure coupling method was used to calculate the damage process of the pre-separation panel structure under the impact of an explosion wave and an impact block.The calculated results were in good agreement with the test results,which showed the rationality of the calculation method and the model.The residual strength of the damaged pre-separation panel was significantly higher than that of the original damaged panel.The results show that the new pre-separation panel structure is reasonable and has certain significance for guiding the design of plenum chambers with strong resistance to implosion for aircraft fuselages.展开更多
基金Supported by the National Natural Science Foundation of China(50921002)the Program of the Universities in Jiangsu Province for Development of High-Tech Industries(JHB05-33)
文摘A high-temperature coal tar （HTCT） was sequentially extracted with petroleum ether （PE）, ethyl acetate （EA）, and acetone with ultrasonic irradiation to afford extracts 1 to 3 （El to E3）, respectively, and acetone residue. The gas chromatography/mass spectrometry （GC/MS） analysis of all extracts show that E1 is mainly composed of diand tricyclic arenes such as naphthalenes, phenan- threne, anthracene, etc., whereas high contents of heteroatomic compounds and four or more ring arenes were found in E2 and E3, respectively. The pyrolysis process of acetone residue was studied with a thermogravimetric （TG） analyzer equipped with Fourier transform infrared （FTIR） spectrometer. The results indicate that volatiles were mainly released at 380-560 ℃, and the maximum mass loss rate occurred at 492 ℃.
文摘To reduce the damage of the pressurizing panel structure of a fuselage caused by an explosion at the“least risk bomb location”in an aircraft structure,a new pre-separation panel structure was designed to resist blast loading.First,the dynamic strain response and morphology of impact damage of the new pre-separation panel were measured in an impact damage test.Second,the commercial software LS-DYNA was used to calculate the propagation of the blast shock wave,and the results were compared with empirical equations to verify the rationality of the numerical calculation method.Finally,the fluid–structure coupling method was used to calculate the damage process of the pre-separation panel structure under the impact of an explosion wave and an impact block.The calculated results were in good agreement with the test results,which showed the rationality of the calculation method and the model.The residual strength of the damaged pre-separation panel was significantly higher than that of the original damaged panel.The results show that the new pre-separation panel structure is reasonable and has certain significance for guiding the design of plenum chambers with strong resistance to implosion for aircraft fuselages.
