A nonlinear semi-analytical scheme is proposed for investigating the finiteamplitude nonlinear sloshing in a horizontally baffled rectangular liquid container under the seismic excitation.The sub-domain method is deve...A nonlinear semi-analytical scheme is proposed for investigating the finiteamplitude nonlinear sloshing in a horizontally baffled rectangular liquid container under the seismic excitation.The sub-domain method is developed to analytically derive the modal behaviors of the baffled linear sloshing.The viscosity dissipation effects from the interior liquid and boundary layers are considered.With the introduction of the generalized time-dependent coordinates,the surface wave elevation and velocity potential are represented by a series of linear modal eigenfunctions.The infinite-dimensional modal system of the nonlinear sloshing is formulated based on the Bateman-Luke variational principle,which is further reduced to the finite-dimensional modal system by using the NarimanovMoiseev asymptotic ordering.The base force and overturning moment induced by the nonlinear sloshing are derived as the functions of the generalized time-dependent coordinates.The present results match well with the available analytical,numerical,and experimental results.The paper examines the surface wave elevation,base force,and overturning moment versus the baffle parameters and excitation amplitude in detail.展开更多
Thermo-elastic analysis of simply-supported orthotropic laminated beams subjected to high temperature and mechanical load is presented on the basis of the exact two-dimensional thermoelasticity theory.The beam is comp...Thermo-elastic analysis of simply-supported orthotropic laminated beams subjected to high temperature and mechanical load is presented on the basis of the exact two-dimensional thermoelasticity theory.The beam is composed of several orthotropic layers,each with temperaturedependent material properties.The governing equation for each layer is analytically solved using the state space method.The displacement and stress solutions of the beam are obtained using the transfer-matrix method.A numerical example is included to study the effects of temperature on the mechanical responses of a sandwich beam.The results reveal two main effects of temperature:(i)inducing deformations and stresses by itself;(ii)affecting the deformations and stresses induced by the mechanical load.展开更多
The temperature and the stress distribution in simply-supported laminated cylindrical shells undergo thermal loads on the surface have been investigated.Exact solutions of physical quantities including temperature,hea...The temperature and the stress distribution in simply-supported laminated cylindrical shells undergo thermal loads on the surface have been investigated.Exact solutions of physical quantities including temperature,heat flux,thermal displacement and stress are developed for the cylindrical laminated shell.Cylindrical shells are partitioned into more thin layers.In cylindrical coordinate,analytical expressions for physical quantities inside each layer are derived.Taking into account the compatibility of physical quantities at the interfaces,the relations between the outer and the inner layer of the laminated shell can be described with a transfer matrix.The undetermined parameters from the solutions of each layer can be obtained with boundary conditions.The convergence of the solutions to the number of Fourier series terms has been checked.The accuracy and feasibility of the present method is verified by comparing theoretical results with numerical outcomes due to Finite Element Method(FEM).Finally,the influences of surface temperature,geometrical size and material properties with respects to temperature,thermal stresses and displacement of layered cylindrical shell are worked out in details in a parameter study.展开更多
The temperature fields in the laminated shells were studied, including opencylindrical shells and cylindrical shells, according to the thermal theory. Analyticalsolution of the temperature in the shells with the known...The temperature fields in the laminated shells were studied, including opencylindrical shells and cylindrical shells, according to the thermal theory. Analyticalsolution of the temperature in the shells with the known temperature on the surfaces waspresent. The thinning layer approach was introduced to simplify the three-dimensionalheat conduction equation. Firstly, the layered shell was divided into N thinner layers. Thegoverning equation was simplified by replacing the variable r by r0 in the center line ofevery thin layer. The general solutions of temperature satisfying the simplified threedimensionalgoverning equation in single-layered shell were deduced in the cylindricalcoordinate system. Then, the temperature and heat flux relationships between the surfacescould be found by transferring matrixes. According to the continuities of temperature andheat flux in the interface of the laminates, the temperature and heat flux relationships ofthe surfaces were derived. With the temperature condition on the surfaces, the unknowncoefficients in the general solution of temperature were obtained. Finally, the effects fromthe thinning layer approach were eliminated by analyzing different numbers of thin layers.The validity and accuracy of the proposal method were proved from the convergence andcomparison studies. And several numerical examples were studied to investigated thetemperature effects from surface temperatures, geometric size of the shells andcomposition of layers.展开更多
A complex of N.N'-ethylencbis (saliylidenemininato) diaquochromium(III) chloride.[Cr (salen) (H2O)2] Cl was prepared. and its decomposition mechanism was studied by TG and DTA. The IR spectrum of the product of th...A complex of N.N'-ethylencbis (saliylidenemininato) diaquochromium(III) chloride.[Cr (salen) (H2O)2] Cl was prepared. and its decomposition mechanism was studied by TG and DTA. The IR spectrum of the product of thermal decomposition was examined at the first stage.Kinetic results were obtained from the analysis of TG-DTG curves with three different methods The most probable kinetic functions were suggested by comparison of kinetic parameters,展开更多
基金Project supported by the National Natural Science Foundation of China(Nos.51978336 and11702117)。
文摘A nonlinear semi-analytical scheme is proposed for investigating the finiteamplitude nonlinear sloshing in a horizontally baffled rectangular liquid container under the seismic excitation.The sub-domain method is developed to analytically derive the modal behaviors of the baffled linear sloshing.The viscosity dissipation effects from the interior liquid and boundary layers are considered.With the introduction of the generalized time-dependent coordinates,the surface wave elevation and velocity potential are represented by a series of linear modal eigenfunctions.The infinite-dimensional modal system of the nonlinear sloshing is formulated based on the Bateman-Luke variational principle,which is further reduced to the finite-dimensional modal system by using the NarimanovMoiseev asymptotic ordering.The base force and overturning moment induced by the nonlinear sloshing are derived as the functions of the generalized time-dependent coordinates.The present results match well with the available analytical,numerical,and experimental results.The paper examines the surface wave elevation,base force,and overturning moment versus the baffle parameters and excitation amplitude in detail.
基金financially supported by the National Natural Science Foundation of China (51778289)the Transportation Science and Technology Project of Jiangsu Province (2014Y01)the Science and Technology Plan Project of Jiangsu Province (BY2016005-12)
文摘Thermo-elastic analysis of simply-supported orthotropic laminated beams subjected to high temperature and mechanical load is presented on the basis of the exact two-dimensional thermoelasticity theory.The beam is composed of several orthotropic layers,each with temperaturedependent material properties.The governing equation for each layer is analytically solved using the state space method.The displacement and stress solutions of the beam are obtained using the transfer-matrix method.A numerical example is included to study the effects of temperature on the mechanical responses of a sandwich beam.The results reveal two main effects of temperature:(i)inducing deformations and stresses by itself;(ii)affecting the deformations and stresses induced by the mechanical load.
文摘The temperature and the stress distribution in simply-supported laminated cylindrical shells undergo thermal loads on the surface have been investigated.Exact solutions of physical quantities including temperature,heat flux,thermal displacement and stress are developed for the cylindrical laminated shell.Cylindrical shells are partitioned into more thin layers.In cylindrical coordinate,analytical expressions for physical quantities inside each layer are derived.Taking into account the compatibility of physical quantities at the interfaces,the relations between the outer and the inner layer of the laminated shell can be described with a transfer matrix.The undetermined parameters from the solutions of each layer can be obtained with boundary conditions.The convergence of the solutions to the number of Fourier series terms has been checked.The accuracy and feasibility of the present method is verified by comparing theoretical results with numerical outcomes due to Finite Element Method(FEM).Finally,the influences of surface temperature,geometrical size and material properties with respects to temperature,thermal stresses and displacement of layered cylindrical shell are worked out in details in a parameter study.
基金supported by the Natural ScienceFoundation of Jiangsu Province (Grant No. BK20160519)the Research Foundation forAdvanced Talents of Jiangsu University (Grant No. 16JDG053)+2 种基金the National NaturalScience Foundation of China (Grant No. 51641804)the Natural Science Foundation ofJiangsu Province of China (Grant No. BK20160536)the Advanced Talents ScientificResearch Foundation of Jiangsu University (Grant No. 15JDG170).
文摘The temperature fields in the laminated shells were studied, including opencylindrical shells and cylindrical shells, according to the thermal theory. Analyticalsolution of the temperature in the shells with the known temperature on the surfaces waspresent. The thinning layer approach was introduced to simplify the three-dimensionalheat conduction equation. Firstly, the layered shell was divided into N thinner layers. Thegoverning equation was simplified by replacing the variable r by r0 in the center line ofevery thin layer. The general solutions of temperature satisfying the simplified threedimensionalgoverning equation in single-layered shell were deduced in the cylindricalcoordinate system. Then, the temperature and heat flux relationships between the surfacescould be found by transferring matrixes. According to the continuities of temperature andheat flux in the interface of the laminates, the temperature and heat flux relationships ofthe surfaces were derived. With the temperature condition on the surfaces, the unknowncoefficients in the general solution of temperature were obtained. Finally, the effects fromthe thinning layer approach were eliminated by analyzing different numbers of thin layers.The validity and accuracy of the proposal method were proved from the convergence andcomparison studies. And several numerical examples were studied to investigated thetemperature effects from surface temperatures, geometric size of the shells andcomposition of layers.
文摘A complex of N.N'-ethylencbis (saliylidenemininato) diaquochromium(III) chloride.[Cr (salen) (H2O)2] Cl was prepared. and its decomposition mechanism was studied by TG and DTA. The IR spectrum of the product of thermal decomposition was examined at the first stage.Kinetic results were obtained from the analysis of TG-DTG curves with three different methods The most probable kinetic functions were suggested by comparison of kinetic parameters,
