A numerical method capable is developed for handling steady laminar flow and heat trans-fer of a highly viscous power-law fluid whose density,viscosity,specific heat and thermalconductivity,vary with temperature.The g...A numerical method capable is developed for handling steady laminar flow and heat trans-fer of a highly viscous power-law fluid whose density,viscosity,specific heat and thermalconductivity,vary with temperature.The governing equations are found to be continuity,monmentumand energy expressions.Important effects such as varying viscosity,natural convection and viscousdissipation are incorporated in the theoretical model.These equations are being attracted by employing a decoupled finite element method.Galerkin’sprinciple is used to handle the momentum and continuity equations.Consistent(SU/PG)andnon-consistent(SU)streamline upwind methods are employed for the energy equation.Comparisonof calculated results and experimental data shows good agreement.Similar results are obtained withSU and SU/PG methods.Velocity and temperature profiles which provide insights into the processare also given.展开更多
In this paper we used finite element method(FEM)to prediet case furniture de-flection.We dispersed and analyzed furniture which made of particleboard by elastic plate elements.The corner joint of case furniture is a k...In this paper we used finite element method(FEM)to prediet case furniture de-flection.We dispersed and analyzed furniture which made of particleboard by elastic plate elements.The corner joint of case furniture is a key problem during the calculation by FEM.We assumed thatsmall elements which located near corner joints were semi—rigid elements.Then we obtained the fab-ricated modulus of elasticity of the semi-rigid elements by individual corner joint experimcnts.Weused four kinds of particleboard and two kinds of corner joint t forms to make up eleven cases.Thedisplacement of some typical points under each load measured by the Furniture Strength Test Ma-chine.Then we compared the displacements of measurcments with that of calculations,the errorswere usually within 30 percent.Results of this study indicated that the deflection of case furniturecould be calculated by using FEM,and proved that the program could be used for predicting casefurniture deflection reliably.展开更多
The fault element is used to handle soft clay strata in a rock mass.The formulas or clasto-plastic stiffnessmatrix for the fault element are derived using the constitutive relationship between plastic increment stress...The fault element is used to handle soft clay strata in a rock mass.The formulas or clasto-plastic stiffnessmatrix for the fault element are derived using the constitutive relationship between plastic increment stress andstrain.A numerical example of a circular tunnel with soft clay strata in the rock medium are examined.展开更多
Clement Daka, 40, is a happy man now that a new tile manufacturing plant has been built in Zambia's capital Lusaka. This, said the hardware store manager, will make it easier for his business as he will no longer ...Clement Daka, 40, is a happy man now that a new tile manufacturing plant has been built in Zambia's capital Lusaka. This, said the hardware store manager, will make it easier for his business as he will no longer need to import tiles and other building supplies from China each month.展开更多
For reinforced concrete members subjected to high temperature,the degree of in-service loading,commonly expressed as the loading ratio,can be highly influential on the structural behavior.In particular,the loading rat...For reinforced concrete members subjected to high temperature,the degree of in-service loading,commonly expressed as the loading ratio,can be highly influential on the structural behavior.In particular,the loading ratio may be pivotal in relation to the phenomenon of load-induced thermal strain.Despite its potentially pivotal role,to date,the influence of the loading ratio on both material and structural behavior has not been explored in detail.In practice,real structures experience variation in imposed loading during their service life and it is important to understand the likely response at elevated temperatures across the loading envelope.In this paper,the effect of the loading ratio is numerically investigated at both material and structural level using a validated finite element model.The model incorporates a proposed constitutive model accounting for load-induced thermal strain and this is shown to outperform the existing Eurocode 2 model in terms of accuracy.Using the validated model,the specific case of flats slabs and the associated connections to supporting columns at various loading ratios are explored.For the cases examined,a marked difference in the structural behavior including displacement direction was captured from low to high loading ratios consistent with experimental observations.展开更多
文摘A numerical method capable is developed for handling steady laminar flow and heat trans-fer of a highly viscous power-law fluid whose density,viscosity,specific heat and thermalconductivity,vary with temperature.The governing equations are found to be continuity,monmentumand energy expressions.Important effects such as varying viscosity,natural convection and viscousdissipation are incorporated in the theoretical model.These equations are being attracted by employing a decoupled finite element method.Galerkin’sprinciple is used to handle the momentum and continuity equations.Consistent(SU/PG)andnon-consistent(SU)streamline upwind methods are employed for the energy equation.Comparisonof calculated results and experimental data shows good agreement.Similar results are obtained withSU and SU/PG methods.Velocity and temperature profiles which provide insights into the processare also given.
文摘In this paper we used finite element method(FEM)to prediet case furniture de-flection.We dispersed and analyzed furniture which made of particleboard by elastic plate elements.The corner joint of case furniture is a key problem during the calculation by FEM.We assumed thatsmall elements which located near corner joints were semi—rigid elements.Then we obtained the fab-ricated modulus of elasticity of the semi-rigid elements by individual corner joint experimcnts.Weused four kinds of particleboard and two kinds of corner joint t forms to make up eleven cases.Thedisplacement of some typical points under each load measured by the Furniture Strength Test Ma-chine.Then we compared the displacements of measurcments with that of calculations,the errorswere usually within 30 percent.Results of this study indicated that the deflection of case furniturecould be calculated by using FEM,and proved that the program could be used for predicting casefurniture deflection reliably.
基金Project Supported by the National Natural science Foundation of China
文摘The fault element is used to handle soft clay strata in a rock mass.The formulas or clasto-plastic stiffnessmatrix for the fault element are derived using the constitutive relationship between plastic increment stress andstrain.A numerical example of a circular tunnel with soft clay strata in the rock medium are examined.
文摘Clement Daka, 40, is a happy man now that a new tile manufacturing plant has been built in Zambia's capital Lusaka. This, said the hardware store manager, will make it easier for his business as he will no longer need to import tiles and other building supplies from China each month.
文摘For reinforced concrete members subjected to high temperature,the degree of in-service loading,commonly expressed as the loading ratio,can be highly influential on the structural behavior.In particular,the loading ratio may be pivotal in relation to the phenomenon of load-induced thermal strain.Despite its potentially pivotal role,to date,the influence of the loading ratio on both material and structural behavior has not been explored in detail.In practice,real structures experience variation in imposed loading during their service life and it is important to understand the likely response at elevated temperatures across the loading envelope.In this paper,the effect of the loading ratio is numerically investigated at both material and structural level using a validated finite element model.The model incorporates a proposed constitutive model accounting for load-induced thermal strain and this is shown to outperform the existing Eurocode 2 model in terms of accuracy.Using the validated model,the specific case of flats slabs and the associated connections to supporting columns at various loading ratios are explored.For the cases examined,a marked difference in the structural behavior including displacement direction was captured from low to high loading ratios consistent with experimental observations.
