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- 저자 : Tianjian Lu (검색결과 2 건)
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Transmission loss of orthogonally stiffened laminated composite plates
Cheng Shen,Fengxian Xin,Tianjian Lu 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.1
Sound transmission through laminated composite plates reinforced by two sets of orthogonal stiffeners is investigated theoretically. Alayerwise shear deformable theory is used to model the vibration of the laminated composite face-panel; A governing equation of I sectioncomposite beam is introduced, which accounts for the extensional, flexural, torsional and their coupling effects. The Euler-Bernoullibeam theory and torsional wave equation are employed to describe the flexural and rotational motions of the rib stiffeners, respectively. The technique of Fourier transform is applied to solve the governing equations resulting in infinite sets of simultaneous algebraic coupledequations, which are numerically solved by truncating them into a finite range insofar as the solutions converge. The accuracy of thenumerical solutions is checked by comparing the present model predictions with existing literature. The validated model is subsequentlyemployed to quantify the effects of the spacing of the stiffeners and the stacking geometry of the laminated composite face-panel andstiffeners on sound transmission through the structure. It is demonstrated that both the stiffener spacing and the stacking geometry havesignificant influences on the sound transmission loss across the structure. The proposed theoretical model successfully characterizes theprocess of sound penetration through stiffened laminated composite plates, which should be much helpful for the practical design of suchstructures with acoustic requirements.
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Guiwu Liu,Hongjie Wang,Jianfeng Yang,Tianjian Lu,Guanjun Qiao 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.4
ZrO2 ceramic/stainless steel joints were fabricated by pressureless brazing using a Ag-Cu filler metal and a TiH2 powder precoating. The microstructure and microchemistry of the joint cross section were characterized and analyzed by means of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The effects of brazing conditions on the joint shear strength were also investigated. The results showed that there existed three zones with distinct microstructural differences crossing the brazing interlayer. A reaction layer and a Ti-rich sublayer were formed at the ZrO2/filler interface. The influence of the brazing temperature on the joint strength was more remarkable than that of the holding time. In the experimental condition ranges, the joint strength first increased, and the maximum shear strength was over 90MPa with the optimized condition. Most of the joint fractures developed in the ceramic matrix near the ceramic/filler interface. ZrO2 ceramic/stainless steel joints were fabricated by pressureless brazing using a Ag-Cu filler metal and a TiH2 powder precoating. The microstructure and microchemistry of the joint cross section were characterized and analyzed by means of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The effects of brazing conditions on the joint shear strength were also investigated. The results showed that there existed three zones with distinct microstructural differences crossing the brazing interlayer. A reaction layer and a Ti-rich sublayer were formed at the ZrO2/filler interface. The influence of the brazing temperature on the joint strength was more remarkable than that of the holding time. In the experimental condition ranges, the joint strength first increased, and the maximum shear strength was over 90MPa with the optimized condition. Most of the joint fractures developed in the ceramic matrix near the ceramic/filler interface.
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